钢筋混凝土压弯构件动态加载尺寸效应试验研究  

Experimental Study on Dynamic Loading Size Effect of RC Beam-Column

作　　者：周宏宇[1] 邢晓帅 解咏平 袁慧 麻全周 ZHOU Hongyu;XING Xiaoshuai;XIE Yongping;YUAN Hui;MA Quanzhou(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;College of Exploration Technology and Engineering,Hebei GEO University,Shijiazhuang 050031,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]河北地质大学勘察技术与工程学院,河北石家庄050031

出　　处：《应用基础与工程科学学报》2020年第5期1187-1196,共10页Journal of Basic Science and Engineering

基　　金：国家自然科学基金(51978012,51378030);北京市自然科学基金京津冀合作专项项目(J160002);北京市自然科学基金面上项目(8152004)。

摘　　要：和现阶段开展的准静态尺寸效应主流研究不同,针对RC压弯构件地震动态破坏的尺寸效应进行研究,综合分析动态加载和尺寸效应对RC压弯构件承载力及其他力学性能的影响.按照相似关系设计3种不同尺寸的矩形截面钢筋混凝土柱,按0.6h0的偏心距进行大偏心加载,加载方案采用3种加载速率的荷载进行加载,通过动态加载研究地震作用.试验结果表明,压弯构件在动态加载过程中,随着尺寸的增大,试件的承载性能增大,但是承载力安全系数降低,名义应力也降低,同时受拉钢筋和受压混凝土的峰值和极限应变也随着尺寸的增大而减小.与尺寸效应规律相反,名义应力和承载力安全系数以及受拉钢筋和受压混凝土应变都随着加载速率的提高而提高.Different from the current mainstream research on quasi-static size effect,this paper studies the size effect of seismic dynamic damage of RC compression-bending members,and comprehensively analyses the influence of dynamic loading and size effect on the bearing capacity and other mechanical properties of RC compression-bending members.Three different sizes of RC columns with rectangular cross-section are prepared according to the similarity relationship.Large eccentricity loading are carried out according to the eccentricity of 0.6h0.Three loading rates are adopted in the loading scheme,and seismic action is discussed by dynamic loading.The test results show that the bearing capacity of the specimens increases with the increase in size,but the safety factor of bearing capacity decreases and the nominal stress decreases.Meanwhile,the peak and ultimate strain of the tensional steel bar and the compressive concrete decrease with the increase in size.Contrary to the rule of size effect,nominal stress,safety factor of bearing capacity,strain of tensional steel bar and compressive concrete increase with the increase of loading rate.

关 键 词：钢筋混凝土柱 压弯构件 动态加载 尺寸效应 试验研究 安全系数 名义应力 

分 类 号：TU375[建筑科学—结构工程]