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Truss-arch model for shear strength of seismic-damaged SRC frame columns strengthened with CFRP sheets
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作者 Sheng PENG Chengxiang XU Xiaoqiang LIU 《结构与土木工程前沿:英文版》 EI CSCD 2019年第6期1324-1337,共14页
Carbon fiber reinforced polymer(CFRP)materials are important reinforcing substances which are widely used in the shear strengthening of seismic-damage steel reinforced concrete(SRC)frame structures.To investigate the ... Carbon fiber reinforced polymer(CFRP)materials are important reinforcing substances which are widely used in the shear strengthening of seismic-damage steel reinforced concrete(SRC)frame structures.To investigate the shear strength of SRC frame columns strengthened with CFRP sheets,experimental observations on eight seismic・damaged SRC frame columns strengthened with CFRP sheets were conducted at Yangtze University and existing experimental data of 49 SRC columns are presented.Based on the existing experiments,the theories of damage degree,zoning analysis of concrete,and strengthening material of the column are adopted.To present the expression formula of the shear strength of SRC frame columns strengthened with CFRP sheets,the contributions of strengthening material and transverse reinforcement to shear strength in the truss model are considered,based on the truss-arch model.The contribution of arch action is also considered through the analysis of the whole concrete and that of the three zones of the concrete are also considered.The formula is verified,and the calculated results are found to match well with the experimental results.Results indicate that the proposed whole analysis model can improve the accuracy of shear strength predictions of shear seismic-damaged SRC frame columns reinforced with CFRP sheets. 展开更多
关键词 carbon fiber reinforced polymer material steel reinforced concrete frame column seismic-damaged trussedarch model shear strength
PPC/纳米羟基磷灰石复合材料的制备及其性能研究
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作者 张永霞 严亮 卢晓龙 《塑料科技》 CAS 北大核心 2019年第8期7-11,共5页
采用共混的方法制备了聚碳酸亚丙酯(PPC)/羟基磷灰石(HAP)复合材料,研究了HAP用量对于PPC/HAP复合材料断面形貌、力学性能、接触角和流变性能的影响。断面形貌分析结果表明,纯PPC材料属于韧性断裂,随着HAP用量的增加,PPC/HAP复合材料逐... 采用共混的方法制备了聚碳酸亚丙酯(PPC)/羟基磷灰石(HAP)复合材料,研究了HAP用量对于PPC/HAP复合材料断面形貌、力学性能、接触角和流变性能的影响。断面形貌分析结果表明,纯PPC材料属于韧性断裂,随着HAP用量的增加,PPC/HAP复合材料逐渐转变为脆性断裂;HAP在PPC基体中能够均匀分散,二者具有良好的界面相容性。力学性能测试结果表明,PPC/HAP复合材料的断裂强度和冲击强度随着HAP用量的增加逐渐提高,而断裂伸长率随着HAP用量的增加逐渐降低。PPC/HAP复合材料具有良好的亲水性,且亲水性与HAP的用量成正比。流变测试结果表明,PPC/HAP复合材料的表观黏度具有温度和剪切速率敏感性,且复合材料的表观黏度随着HAP用量的增加先提高后降低。 展开更多
关键词 聚碳酸亚丙酯 羟基磷灰石 增强 流变性能 接触角
Correction to: spherical cavity-expansionmodel for penetration of reinforced-concrete targets 预览
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作者 Y. J. Deng W. J. Song X. W. Chen 《力学学报:英文版》 SCIE EI CAS CSCD 2019年第4期940-941,共2页
In the original publication, Figs. 12, 13, 17 and 18 are incorrectly published. The correct versions of figures are provided in this correction. The second sentence in the third paragraph of Sect. 5.1 "Test of Ca... In the original publication, Figs. 12, 13, 17 and 18 are incorrectly published. The correct versions of figures are provided in this correction. The second sentence in the third paragraph of Sect. 5.1 "Test of Canfield and ClatorM should read as "As shown in Fig. 1 & the penetration depth obtained using the compressible model for reinforced concrete was slightly lower than that of Luk and ForrestaFs model [25]". 展开更多
关键词 ORIGINAL PUBLICATION REINFORCED CONCRETE Canfield
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Microstructure and mechanical properties of AZ31 magnesium alloy reinforced by I-phase
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作者 Hai-Rong Wu Wen-Bo Du +2 位作者 Shu-Bo Li Ke Liu Zhao-Hui Wang 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第8期733-738,共6页
The particles of Mg-Zn-Gd icosahedral quasicrystal master alloy were added into the AZ31 alloy by the repeated plastic working(RPW)process in order to improve the mechanical properties of the AZ31 alloy at room temper... The particles of Mg-Zn-Gd icosahedral quasicrystal master alloy were added into the AZ31 alloy by the repeated plastic working(RPW)process in order to improve the mechanical properties of the AZ31 alloy at room temperature.The microstructure and tensile properties of composites were investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and tensile testing machine at room temperature.The results suggest that the RPW process can effectively refine the matrix and make the I-phase particles distribute uniformly.The ultimate tensile strength and the yield strength of the composites reach their maximum values of 362.3 and 330.5 MPa,respectively,when the amount of I-phase particles added is10 %.Meanwhile,the elongation of the composites decreases sharply. 展开更多
关键词 I-phase REINFORCED COMPOSITE Repeated PLASTIC working Mechanical PROPERTY
Crevice Corrosion Behaviors Between CFRP and Stainless Steel 316L for Automotive Applications
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作者 Xia-Yu Wu Jia-Kun Sun +2 位作者 Jia-Ming Wang Yi-Ming Jiang Jin Li 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第10期1219-1226,共8页
Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applicati... Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applications. The existence of crevices will result in galvanic corrosion and crevice corrosion when CFRPs and 316L are directly connected. A crevice former for the galvanic system was therefore designed and applied to evaluate the crevice corrosion behaviors and study the mechanism of galvanic crevice corrosion through several electrochemical techniques in this research. The results showed that the crevice corrosion of galvanic systems grew from crevice mouth to the inside crevice and could be divided into four steps, metastable pitting corrosion at the crevice mouth, initiating step of crevice corrosion, propagating step and ending step of crevice corrosion. Because of the influences of the galvanic system, electrode reaction rates were speeded up and the passivation region was shortened at the initiating stage of crevice corrosion. Corrosion rate was observed to be higher in the galvanic system than that in normal crevice systems. 展开更多
关键词 Crevice corrosion Galvanic system Carbon FIBER reinforced plastics 316L STAINLESS STEELS
Numerical Modeling Strategy for the Simulation of Nonlinear Response of Slender Reinforced Concrete Structural Walls 预览
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作者 Mohammed A.Mohammed Andre R.Barbosa 《工程与科学中的计算机建模(英文)》 2019年第9期583-627,共45页
A three-dimensional nonlinear modeling strategy for simulating the seismic response of slender reinforced concrete structural walls with different cross-sectional shapes is presented in this paper.A combination of non... A three-dimensional nonlinear modeling strategy for simulating the seismic response of slender reinforced concrete structural walls with different cross-sectional shapes is presented in this paper.A combination of nonlinear multi-layer shell elements and displacement-based beam-column elements are used to model the unconfined and confined parts of the walls,respectively.A uniaxial material model for reinforcing steel bars that includes buckling and low-cyclic fatigue effects is used to model the longitudinal steel bars within the structural walls.The material model parameters related to the buckling length are defined based on an analytical expression for reinforcing steel bars embedded in reinforced concrete elements,which are developed based on beam-on-springs model,and validated with experimental tests of boundary elements of structural walls available in the literature.Six experimental case studies of reinforced concrete walls with rectangularshape,T-shape,and U-shape cross-section are used to validate the structural wall numerical modeling strategy. 展开更多
关键词 Bar buckling finite element modeling low-cycle fatigue reinforced concrete structural walls
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Recent Advances in Hole Making of FRP/Metal Stacks:A Review 预览
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作者 CHEN Yan YANG Haojun +2 位作者 XU Jiuhua FU Yucan YAN Chaoren 《南京航空航天大学学报:英文版》 EI CSCD 2019年第3期361-375,共15页
Weight reduction is a key driving force for materials development in aerospace industry,which leads to extensive usage of lightweight structural materials such as fiber reinforced polymer(FRP),titanium alloy,aluminum ... Weight reduction is a key driving force for materials development in aerospace industry,which leads to extensive usage of lightweight structural materials such as fiber reinforced polymer(FRP),titanium alloy,aluminum alloy,etc.Hole making is indispensable to assembling these lightweight components by riveted or bolted joints.However,hole making of FRP / metal stacks is always the most challenging task due to differences of material properties between FRP and metals.A comprehensive literature review on hole making of FRP/metal stacks in the last decade is given with a focus on four main aspects including drilling operation,drilling damages and machining parameter optimization,tool performance and wear,and developments in hole making technology.Finally,in order to ensure the precise and efficient hole making of FRP/metal stacks,an idea of low frequency vibration assisted drilling(LFVAD)FRP/metal stacks based on material removal characteristics is put forward by fully exploiting the unique advantages of LFVAD technology. 展开更多
关键词 fiber reinforced polymer (FRP)/metal STACKS DRILLING MACHINING quality tool wear helical MILLING vibration assisted DRILLING abrasive water jet MACHINING
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Effect of axial load and transverse reinforcements on the seismic performance of reinforced concrete columns
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作者 Mounir Ait BELKACEM Hakim BECHTOULA +1 位作者 Nouredine BOURAHLA Adel Ait BELKACEM 《结构与土木工程前沿:英文版》 EI CSCD 2019年第4期831-851,共21页
The aim of this research is to assess the seismic performance of reinforced concrete columns under different axial load and transverse reinforcement ratios. These two parameters are very important as for the ductility... The aim of this research is to assess the seismic performance of reinforced concrete columns under different axial load and transverse reinforcement ratios. These two parameters are very important as for the ductility, strength, stiffness, and energy dissipation capacity for a given reinforced concrete column. Effects of variable axial load ratio and transverse reinforcement ratio on the seismic performance of reinforced concrete columns are thoroughly analyzed. The finite element computer program Seismo-Structure was used to perform the analysis of series of reinforced concrete columns tested by the second author and other researchers. In order to reflect the reality and grasp the actual behavior of the specimens, special attention was paid to select the models for concrete, confined concrete, and steel components. Good agreements were obtained between the experimental and the analytical results either for the lateral force-drift relationships or for the damage progress prediction at different stages of the loading. 展开更多
关键词 REINFORCED concrete COLUMNS AXIAL load TRANSVERSE REINFORCEMENT DUCTILITY
玻纤增强共聚甲醛MC90产品的研究与制备 预览
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作者 张彩霞 《广州化工》 CAS 2019年第20期53-54,62共3页
MC90是共聚甲醛装置上的主要产品,具有耐磨、耐热、耐冲击和耐化学性等优良性能.但在一些特殊环境中,其强度不能满足高强度产品要求.为了提高MC90产品的强度,以MC90产品为基础料,利用玻璃纤维进行增强改性研究,在相容剂A作用下,玻璃纤... MC90是共聚甲醛装置上的主要产品,具有耐磨、耐热、耐冲击和耐化学性等优良性能.但在一些特殊环境中,其强度不能满足高强度产品要求.为了提高MC90产品的强度,以MC90产品为基础料,利用玻璃纤维进行增强改性研究,在相容剂A作用下,玻璃纤维提升了共聚甲醛MC90产品的强度和热变形温度,强度增大了一倍,热变形温度提高60~68℃了达到了增强改性MC90的实验目标. 展开更多
关键词 玻纤 POM 增强 相容剂 力学性能
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Effect of Fibre Packing on Random Variability of Compressive Strength of Unidirectional Carbon Fibre Reinforced Plastic 预览
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作者 徐东 黄金娥 +1 位作者 章力 张书锋 《东华大学学报:英文版》 EI CAS 2019年第1期62-66,共5页
Compression tests on twenty unidirectional(UD) carbon fibre reinforced plastic(CFRP) specimens are conducted, the statistics on the measured compressive strength is calculated, and the fracture surface is characterize... Compression tests on twenty unidirectional(UD) carbon fibre reinforced plastic(CFRP) specimens are conducted, the statistics on the measured compressive strength is calculated, and the fracture surface is characterized. Two types of different fracture surface are experimentally observed, and they are corresponding to very different values on the compressive strength. A finite element(FE) analysis is conducted to investigate the influence of random fibre packing on the compressive strength. And a riks method(provided in ABAQUS software) is applied in FE model to analyze fibre buckling behaviour in the vicinity of compressive failure. The FE analysis agrees well with the experimental observation on the two types of buckling modes and also the partition of compressive strength. It is clearly shown that the random fibre packing lays a significant influence on the random variability of compressive strength of CFRP. 展开更多
关键词 carbon FIBRE reinforced plastic(CFRP) COMPRESSIVE strength random VARIABILITY FIBRE BUCKLING finite element(FE) reliability
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超高清水混凝土圆柱施工技术 预览
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作者 徐素君 徐旭 《建筑技术开发》 2019年第8期40-41,共2页
苏州工业园区体育中心体育馆共计使用了31根清水混凝土圆柱,其中有17根12m高的清水柱,做好清水混凝土柱从混凝土原材料、模板的选择、模板的安装要点、钢筋的绑扎要点、振捣点的布置、混凝土的养护等方面共同控制,控制措施可供类似工程... 苏州工业园区体育中心体育馆共计使用了31根清水混凝土圆柱,其中有17根12m高的清水柱,做好清水混凝土柱从混凝土原材料、模板的选择、模板的安装要点、钢筋的绑扎要点、振捣点的布置、混凝土的养护等方面共同控制,控制措施可供类似工程参考。 展开更多
关键词 清水混凝土 样板 模板 钢筋
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Application of Glass Fiber Reinforced Polymer Composite (GFRPC) Escape Pipeline in Tunnel 预览
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作者 Enhai Tuo 《世界建筑(百图)》 2019年第5期5-12,共8页
During the tunnel construction process,unfavorable geological conditionsare often encountered.Geological disasters such as collapse,roof fall,water inrush,gas explosion,etc.occur frequently,causing different degrees o... During the tunnel construction process,unfavorable geological conditionsare often encountered.Geological disasters such as collapse,roof fall,water inrush,gas explosion,etc.occur frequently,causing different degrees of property damage and casualties to the construction of the tunnel,seriously affecting harmony during construction.The domestic emergency hedging is mainly the use of 8-10mm steel coils,but the steel is heavy and not suitable for the frequent movement of tunnels.This paper introduces the new Glass Fiber Reinforced Polymer Composite(GFRPC)escape pipeline used in Chongqing Jiuyongyi Jinyunshan Tunnel,and compares the traditional steel coil parameters to provide reference for subsequent tunnel hedging measures. 展开更多
关键词 Tunnel glass fiber reinforced polymer composite escape pipe Light and safety
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3-Phase hierarchical graphene-based epoxy nanocomposite laminates for automotive applications
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作者 Ahmed Elmarakbi Panagiotis Karagiannidis +7 位作者 Alessandra Ciappa Franco Innocente Francesco Galise Brunetto Martorana Francesco Bertocchi Francesco Cristiano Elvira Villaro Abalos Julio Gomez 《材料科学技术:英文版》 SCIE EI CAS CSCD 2019年第10期2169-2177,共9页
Two different types of graphene flakes were produced following solution processing methods and dispersed using shear mixing in a bifunctional(A) and a multifunctional(B) epoxy resin at a concentration of 0.8 and 0.6 w... Two different types of graphene flakes were produced following solution processing methods and dispersed using shear mixing in a bifunctional(A) and a multifunctional(B) epoxy resin at a concentration of 0.8 and 0.6 wt%, respectively. The graphene/epoxy resin mixtures were used to impregnate unidirectional carbon fibre tapes. These prepregs were stacked(seven plies) and cured to produce laminates.The interlaminar fracture toughness(mode-I) of the carbon fiber/graphene epoxy laminates with resin B showed over 56% improvement compared with the laminate without graphene. Single lap joints were prepared using the laminates as adherents and polyurethane adhesives(Sika 7666 and Sika 7888). The addition of graphene improved considerably the adhesion strength from 3.3 to 21 MPa(sample prepared with resin A and Sika 7888) highlighting the potential of graphene as a secondary filler in carbon fibre reinforced polymer composites. 展开更多
关键词 Graphene Carbon fibre reinforced polymer(CFRP) Fracture toughness Shear lap joints
Micro Model of Carbon Fiber/Cyanate Ester Composites and Analysis of Machining Damage Mechanism 预览
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作者 Haitao Liu Jie Lin +1 位作者 Yazhou Sun Jinyang Zhang 《中国机械工程学报:英文版》 SCIE EI CAS CSCD 2019年第3期198-208,共11页
Machining damage occurs on the surface of carbon fiber reinforced polymer (CFRP) composites during processing. In the current simulation model of CFRP, the initial defects on the carbon fiber and the periodic random d... Machining damage occurs on the surface of carbon fiber reinforced polymer (CFRP) composites during processing. In the current simulation model of CFRP, the initial defects on the carbon fiber and the periodic random distribution of the reinforcement phase in the matrix are not considered in detail, which makes the characteristics of the cutting model significantly different from the actual processing conditions. In this paper, a novel three-phase model of carbon fiber/cyanate ester composites is proposed to simulate the machining damage of the composites. The periodic random distribution of the carbon fiber reinforced phase in the matrix was realized using a double perturbation algorithm. To achieve the stochastic distribution of the strength of a single carbon fiber, a novel method that combines the Weibull intensity distribution theory with the Monte Carlo method is presented. The mechanical properties of the cyanate matrix were characterized by fitting the stress-strain curves, and the cohesive zone model was employed to simulate the interface. Based on the model, the machining damage mechanism of the composites was revealed using finite element simulations and by conducting a theoretical analysis. Furthermore, the milling surfaces of the composites were observed using a scanning electron microscope, to verify the accuracy of the simulation results. In this study, the simulations and theoretical analysis of the carbon fiber/cyanate ester composite processing were carried out based on a novel three-phase model, which revealed the material failure and machining damage mechanism more accurately. 展开更多
关键词 Carbon fiber reinforced polymer COMPOSITES MICRO simulation model MACHINING damage mechanism MILLING and observation experiment Theoretical ANALYSIS
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酸雨污染对钢筋混凝土组合梁结构耐久性的影响研究 预览
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作者 王德俊 《环境科学与管理》 CAS 2019年第10期54-59,共6页
为了解决目前钢筋混凝土耐久性的分析模型准确性和有效性不足的问题,提出酸雨污染条件下分析钢筋混凝土组合梁结构耐久性影响模型。分析酸雨对混凝土的腐蚀过程和酸雨对钢筋的腐蚀过程;根据酸雨腐蚀过程,计算酸雨侵蚀下钢筋混凝土组合... 为了解决目前钢筋混凝土耐久性的分析模型准确性和有效性不足的问题,提出酸雨污染条件下分析钢筋混凝土组合梁结构耐久性影响模型。分析酸雨对混凝土的腐蚀过程和酸雨对钢筋的腐蚀过程;根据酸雨腐蚀过程,计算酸雨侵蚀下钢筋混凝土组合梁结构中混凝土碳化深度;利用碳化深度得到钢筋混凝土组合梁结构中钢筋锈蚀深度;通过碳化深度和锈蚀深度计算耐久性指数;至此,模型构建完成。提出的酸雨污染对钢筋混凝土组合梁结构耐久性影响分析模型,与常规分析模型相比准确性得到了提高,并且其结果有效性也提高了15.3%,适合使用在酸雨污染对钢筋混凝土组合梁结构耐久性影响分析中。 展开更多
关键词 钢筋 混凝土 耐久性 酸雨污染
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加固后现浇混凝土楼板承载能力分析与静载实验研究 预览
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作者 李慧民 熊登 +1 位作者 张晓旭 熊雄 《工程质量》 2019年第10期79-83,共5页
现浇混凝土楼板是钢筋混凝土结构中重要承重构件,不仅需要承受水平方向的竖直荷载,还要满足结构承载力要求和功能使用要求,当楼板出现影响结构承载力的质量缺陷后,为确保楼板的使用功能,应及时对其进行加固处理。为了验证加固后现浇钢... 现浇混凝土楼板是钢筋混凝土结构中重要承重构件,不仅需要承受水平方向的竖直荷载,还要满足结构承载力要求和功能使用要求,当楼板出现影响结构承载力的质量缺陷后,为确保楼板的使用功能,应及时对其进行加固处理。为了验证加固后现浇钢筋混凝土楼板的承载能力是否满足要求,对楼板采用原位加载试验来检验加固后楼板承载能力。论文对某商业大厦现浇混凝土楼板进行了现场原位加载试验,利用有限元软件辅助分析楼板的承载力,并和现场实测数据结果进行对比分析,来评价该楼板是否满足承载能力要求。 展开更多
关键词 现浇钢筋混凝土楼板 加固 原位加载试验 有限元分析
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填充及增强ABS/PBT合金的性能比较与机理研究 预览 被引量:1
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作者 叶南颷 陈平绪 +2 位作者 唐磊 付锦锋 杨霄云 《塑料工业》 CAS CSCD 北大核心 2019年第5期53-57,共5页
以丙烯腈-丁二烯-苯乙烯共聚物(ABS)/聚对苯二甲酸丁二醇酯(PBT)合金为研究对象,研究了碳酸钙、滑石粉、硅灰石和玻纤对合金力学强度、流动性和缺口冲击强度的影响。为了研究合金体系与单一组分体系的区别,对相同类型填充的ABS与ABS/PB... 以丙烯腈-丁二烯-苯乙烯共聚物(ABS)/聚对苯二甲酸丁二醇酯(PBT)合金为研究对象,研究了碳酸钙、滑石粉、硅灰石和玻纤对合金力学强度、流动性和缺口冲击强度的影响。为了研究合金体系与单一组分体系的区别,对相同类型填充的ABS与ABS/PBT合金的力学性能进行对比,讨论了二者之间的联系。最后,通过电镜对不同填料填充的合金相形态进行了观察并分析了机理。结果表明,不同填料对合金的性能贡献均有不同,对于强度属性体现了协调作用。20%滑石粉填充ABS和PBT的弯曲强度分别为65. 9 MPa和100. 8 MPa,而相同填充下ABS/PBT合金的弯曲强度为83. 6 MPa。如果按两者的混合比例计算,合金的弯曲强度应为62. 3 MPa。 展开更多
关键词 丙烯腈-丁二烯-苯乙烯共聚物 聚对苯二甲酸丁二醇酯 合金 填充 增强
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Evaluation of the fishbone model in simulating the seismic response of multistory reinforced concrete moment-resisting frames 预览
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作者 Qu Zhe Gong Ting +1 位作者 Li Qiqi Wang Tao 《地震工程与工程振动:英文版》 SCIE EI CSCD 2019年第2期315-330,共16页
The fishbone model is a simplified numerical model for moment-resisting frames that is capable of modelling the effects of column-beam strength and stiffness ratios. The applicability of the fishbone model in simulati... The fishbone model is a simplified numerical model for moment-resisting frames that is capable of modelling the effects of column-beam strength and stiffness ratios. The applicability of the fishbone model in simulating the seismic responses of reinforced concrete moment-resisting frames of different sets of column-beam strength and stiffness ratios are evaluated through nonlinear static, dynamic and incremental dynamic analysis on six prototype buildings of 4-, 8-and 12-stories. The results show that the fishbone model is practically accurate enough for reinforced concrete frames, although the assumption of equal joint rotation does not hold in all cases. In addition to the ground motion characteristics and the number of stories in the structures, the accuracy of the model also varies with the column-beam stiffness and strength ratios. The model performs better for strong column-weak beam frames, in which the lateral drift patterns are better controlled by the continuous stiffness provided by the strong columns. When the inelastic deformation is large, the accuracy of the model may be subjected to large record-to-record variability. This is especially the case for frames of weak columns. 展开更多
关键词 FISHBONE MODEL reinforced concrete frame strong column-weak beam column-beam stiffness ratio INCREMENTAL dynamic analysis
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Comparison of Seismic Design Codes between China and the United States for Reinforced Soil Retaining Walls 预览
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作者 XU Peng TIAN Hongcheng +1 位作者 JIANG Guanlu WANG Zhimeng 《中国地震研究:英文版》 CSCD 2019年第1期147-152,共6页
Because of its excellent seismic performance, reinforced soil retaining walls are increasingly used in civil engineering. Although many countries have published corresponding design codes, the differences between them... Because of its excellent seismic performance, reinforced soil retaining walls are increasingly used in civil engineering. Although many countries have published corresponding design codes, the differences between them are still relatively large. Using the FHWA Code and the Code for Seismic Design of Railway Engineering (CSDRE), stability calculations of reinforced soil retaining walls were carried out and the similarities and differences between these two design codes were analyzed. According to the comparative analysis, the following conclusions are drawn: the inertia force, the earth pressure and the tensile force of reinforcements calculated from the CSDRE are less than those from the FHWA Code, and the safety factor calculated from the former is larger. Although the M-O method is recommended to calculate the dynamic earth pressure, the FHWA Code suggests a higher action point as compared to the CSDRE. 展开更多
关键词 SEISMIC performance Reinforced soil retaining WALL INERTIA FORCE Earth pressure TENSILE FORCE
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Impact of repeated loading on mechanical response of a reinforced sand 预览
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作者 Aida Mehrpazhouh Seyed Naser Moghadas Tafreshi Mehdi Mirzababaei 《岩石力学与岩土工程学报:英文版》 CSCD 2019年第4期804-814,共11页
Pavements constructed over loosely compacted subgrades may not possess adequate California bearing ratio (CBR) to meet the requirements of pavement design codes,which may lead to a thicker pavement design for addressi... Pavements constructed over loosely compacted subgrades may not possess adequate California bearing ratio (CBR) to meet the requirements of pavement design codes,which may lead to a thicker pavement design for addressing the required strength.Geosynthetics have been proven to be effective for mitigating the adverse mechanical behaviors of weak soils as integrated constituents of base and sub-base layers in road construction.This study investigated the behaviors of unreinforced and reinforced sand with nonwoven geotextile using repeated CBR loading test (followed by unloading and reloading).The depth and number of geotextile reinforcement layers,as well as the compaction ratio of the soil above and below the reinforcement layer(s) and the compaction ratio of the sand bed,were set as variables in this context.Geotextile layers were placed at upper thickness ratios of 0.3,0.6 and 0.9 and the lower thickness ratio of 0.3.The compaction ratios of the upper layer and the sand bed varied between 85% and 97% to simulate a dense layer on a medium dense sand bed for all unreinforced and reinforced testing scenarios.Repeated CBR loading tests were conducted to the target loads of 100 kgf,150 kgf,200 kgf and 400 kgf,respectively (1 kgf=9.8 N).The results indicated that placing one layer of reinforcement with an upper thickness ratio of 0.3 and compacting the soil above the reinforcement to compaction ratio of 97% significantly reduced the penetration of the CBR piston for all target repeated load levels.However,using two layers of reinforcement sandwiched between two dense soil layers with a compaction ratio of 97% with upper and lower thickness ratios of 0.3 resulted in the lowest penetration. 展开更多
关键词 GEOSYNTHETICS GEOTEXTILE Reinforced soil California bearing ratio (CBR) ELASTIC behavior Repeated loading DENSE SAND Medium DENSE SAND
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