低周反复荷载下预应力型钢混凝土偏心受拉构件延性分析  

Analysis ductility of eccentrically tensioned members of PSRC under low cyclic loading

作　　者：张鹏[1] 覃宣盛 邓宇[1] 桂金洋 花东升 Zhang Peng;Qin Xuan-sheng;Deng Yu;Gui Jin-yang;Hua Dong-sheng(College of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006

出　　处：《工程抗震与加固改造》2022年第3期47-55,64,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(51768008);广西自然科学基金项目(2019JJA160137)。

摘　　要：为研究地震作用下预应力型钢混凝土(PSRC)受拉构件的滞回延性,以预应力筋类型、预应力度、偏心距以及拉力值为主要参数,设计了8个预应力偏拉构件和3个普通偏拉构件并对其进行拟静力加载试验。在此基础上,对比分析了各参数对预应力型钢混凝土受拉构件延性性能的影响。结果表明:各试件的破坏形态为弯曲型破坏和弯剪型破坏;延性系数随着偏心距和竖向拉力的增大而减小,随着预应力度的增大而呈现先增后减的趋势;配置预应力螺纹钢筋试件的滞回延性优于预应力CFRP筋试件;预应力型钢混凝土受拉构件的极限弹塑性层间位移角在6.2%~10.3%之间,均大于抗震规范位移角限值2%,表明其在拉-弯-剪复合作用下极限变形能力较好。In order to study the hysteretic ductility of PSRC members under earthquake action, eight prestressed partial tension members and three ordinary partial tension members are designed and tested with the main parameters of prestressed tendon type, prestressing strength, eccentricity and tensile force. On the basis of this, the influence of various parameters on the ductility of PSRC tensile members is analyzed. The results show that: the failure mode of each specimen is bending failure or bending shear failure;the ductility coefficient decreases with the increase of eccentricity and vertical tensile force, and increases first and then decreases with the increase of prestressing strength;the ductility coefficient of the specimen with prestressed screw reinforcement is better than that of the specimen with prestressed CFRP reinforcement;the elastic-plastic interlayer displacement angle of prestressed steel reinforced concrete tensile members is between 6.2% and 10.3%,all of them are larger than the displacement angle limit of seismic code 2%, which indicates that the ultimate deformation capacity of the structure is better under the action of tension bending shear composite.

关 键 词：预应力型钢混凝土 CFRP筋 偏心受拉 延性系数 位移角 

分 类 号：TU398.9[建筑科学—结构工程]