考虑双向荷载效应RC箱型墩抗震性能评价方法  

Seismic performance evaluation method for RC box piers under biaxial lateral loads

作　　者：李嘉维 贾孝可 LI Jiawei;JIA Xiaoke(College of Civil Engineering,Yango University,Fuzhou 350015,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]阳光学院土木工程学院,福建福州350015 [2]福州大学土木工程学院,福建福州350108

出　　处：《山东理工大学学报（自然科学版）》2020年第6期46-51,56,共7页Journal of Shandong University of Technology:Natural Science Edition

基　　金：福建省建设厅科技项目(2017-K-77);福建省教育厅科技项目(JAT190970);厦门市建设局科技项目(XJK2017-1-4,XJK2017-1-5)。

摘　　要：为了准确评价双向荷载作用下钢筋混凝土(RC)箱型桥墩的位移延性和极限承载力,应用不同屈服位移计算方法得出了箱型桥墩的屈服位移和屈服荷载,并对不同轴压比的钢筋混凝土箱型墩截面进行分析。通过数值模拟得到P-Mx-My相互作用三维极限荷载面,对双向荷载作用下的极限承载能力评估方法进行了研究。结果表明,双直线能量等效面积法是一种简单且较精确的屈服位移计算方法,适用于钢筋混凝土箱型墩位移延性分析。考虑双向荷载耦合作用的计算极限荷载值均小于试验值,相应的三维极限荷载面可用于RC箱型墩的安全校核,并评价双向荷载作用下RC箱型桥墩的抗震性能。In order to evaluate the displacement ductility and ultimate bearing capacity of reinforced concrete(RC)box-type piers under biaxial loading,the yield displacement and yield load of box piers were obtained by using different yield displacement calculation methods.The reinforced concrete box section was analyzed with different axial compression ratios.The P-Mx-My three-dimensional ultimate load surface was obtained by numerical simulation,and the ultimate bearing capacity evaluation method under biaxial loading was studied.The results show that the double-line energy equivalent area method is a simple and accurate method to calculate the yield displacement,which is suitable for the displacement ductility calculation of reinforced concrete box piers.The calculated ultimate load values considering the coupling effect of biaxial loads are all smaller than the test ones.The calculated three-dimensional ultimate load surface can be used for the safety check of the reinforced concrete box-shaped piers,and can be combined with the displacement ductility analysis to reasonably evaluate seismic performance of the RC box type pier under the action of biaxial loads.

关 键 词：RC箱型桥墩 双向荷载作用 屈服位移 位移延性 极限承载力 

分 类 号：TU375.4[建筑科学—结构工程]