山区高架桥非规则三柱式排架桥墩抗震设计  

SEISMIC DESIGN OF NON STANDARD THREE-COLUMN PIER OF MOUNTAIN VIADUCT

作　　者：张潇文 杨建荣[1] 李德权 ZHANG Xiao-wen;YANG Jian-rong;Li De-quan(Kunming University of Science and Technology,Faculty of Civil Engineering and Mechanics,650500,Kunming,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500

出　　处：《建筑技术》2025年第5期545-550,共6页Architecture Technology

摘　　要：依托云南某机场的高架桥工程,根据实际非规则三柱式排架桥墩设计制作缩尺模型,通过开展拟静力试验进行结构抗震分析,得到非规则三柱式排架桥墩在水平低周往复荷载作用下的破坏形态和抗震性能。试验结果表明,由于结构受力分配不均匀,矮墩受剪切破坏后,中墩和高墩的抗震性能还未得到完全发挥。在此基础上,根据试验模型,运用OpenSees有限元软件建立排架桥墩有限元模型,对比拟静力试验得到的滞回曲线、骨架曲线、刚度特性和位移延性等抗震性能指标,验证模型的准确性。根据抗震性能分析,针对非规则三柱式排架桥墩提出了设置横向系梁和设置横向斜撑2种抗震措施。通过能力谱法分析增加抗震措施的结构抗震性能,得出罕遇地震下在Ⅶ度和Ⅷ度地震烈度区,使用横向系梁和横向斜撑都能有效提高排架桥墩的整体稳定性和安全性,但在Ⅷ度地震烈度区仅设置横向斜撑的措施能满足抗震要求。Based on the viaduct project of an airport in Yunnan,a scaled model of an irregular three-column pier was designed manufactured according to the actual design,and pseudo-static tests were carried out to analyze the seismic performance of the structure.The failure mode and seismic performance of the irregular three pier under horizontal low-cycle repeated loading were obtained.The test results show that due to the uneven distribution of the structure's internal force,the seismic performance of the medium high piers has not been fully utilized after the short pier is destroyed by shear.On this basis,the finite element model of the pier was established by using Openes finite element software according to the test model,and the hysteresis curve,skeleton curve,stiffness characteristics and displacement ductility obtained from the pseudo-static test compared to verify the accuracy of the model.According to the seismic performance analysis,two seismic measures,setting transverse tie beams and setting transverse diagonal bracing,proposed for the irregular three-column pier.The seismic performance of the structure with added seismic measures was analyzed by using the capacity spectrum method,and it was concluded that both transverse tie beams and the transverse diagonal bracing can effectively improve the overall stability and safety of the pier in the seismic intensity areas ofⅦandⅧunder rare earthquakes,but the measure of setting only the transverse diagonal bracing in theⅧdegree seismic intensity area can meet the seismic requirements.

关 键 词：高架桥桥墩 三柱式排架桥墩 抗震设计 试验 有限元分析 

分 类 号：TU74[建筑科学—建筑技术科学]