钢筋粘结滑移弯矩-转角计算模型  

A CALCULATION MODEL FOR THE SLIP MOMENT-ROTATION OF REINFORCEMENT BOND

作　　者：熊能 顾冬生[1,2] XIONG Neng;GU Dong-sheng(College of Environmental and Civil Engineering,Jiangnan University,Wuxi,Jiangsu,214122,China;Engineering Research Center of Embankment Safety and Disease Prevention and Control of Ministry of Water Resources,Zhengzhou,He’nan 450003,China)

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]水利部堤防安全与病害防治工程技术研究中心,河南郑州450003

出　　处：《工程力学》2019年第12期98-105,共8页Engineering Mechanics

基　　金：水利部堤防安全与病害防治工程技术研究中心开放课题基金项目(2015005);江苏省自然科学基金项目(BK20131105)

摘　　要：纵筋在梁-柱或基础-柱界面处滑移将使侧向变形出现显著的增加。该文在现有二折线型钢筋粘结滑移弯矩-转角骨架曲线基础上,提出了屈服点以及破坏点滑移转角计算方法,可以用于预测滑移造成的侧向变形。根据与相互独立的五批共24个圆柱试验结果对比,其计算结果具有较高的精度。在OpenSees软件中用基于力的纤维单元与粘结滑移弯矩-转角模型,对不同圆柱低周反复试验进行数值模拟,发现该模型计算结果与试验结果吻合很好。进一步,对圆柱在地震波作用下的振动台试验进行时程分析,柱顶位移和柱底滑移变形都能得到很好的预测。进行参数分析,结果表明极限点滑移量在总变形中的占比约为30%~40%,该占比随轴压比增加而减小,随体积配箍率减小而减小。The longitudinal reinforcement slip at the beam-column or footing-column interface significantly increases the lateral deformation.The envelope curve of the moment-rotation model caused by this slip is usually idealized as a bilinear curve.This study modified the bilinear curve and proposed the calculation model for slip rotation of yielding and failure points.Compared with the experimental results of 24 circular columns in five independent batches,the accuracy of the model was verified.This bond slip moment-rotation model was simulated in software OpenSees,and the force-based element was selected to model columns.The numerical simulation of cyclic tests of circular columns showed that the calculated results were in good agreement with the test results.Furthermore,time history analysis was conducted to simulate shake table test,and the results demonstrated that both top displacement and bottom slip rotation were well predicted.The results of parameter analysis showed that the ratio of slip deformation to total lateral deformation at the failure point was about 30%-40%,and both the increase in the column axial compression ratio and the decrease in the volume ratio of stirrups would reduce this ratio.

关 键 词：RC圆柱 粘结滑移 弯矩-转角 混凝土柱变形 OPENSEES 

分 类 号：TU375.3[建筑科学—结构工程]