摘要
为研究大跨度斜拉桥倒Y型混凝土主塔横向破坏机理和弹塑性性能,选取典型大跨度倒Y型混凝土主塔斜拉桥,基于OpenSees非线性有限元平台,建立了考虑主塔弹塑性的非线性全桥有限元模型;以3组实测地震记录为地震动输入,采用动力增量分析方法(IDA)进行研究分析。研究结果表明:在不同实测地震动输入下,斜拉桥混凝土主塔横向屈服在横梁上侧截面,并由核心混凝土外侧钢筋拉应变控制,而破坏则在塔底或横梁上侧截面,并由核心混凝土外侧混凝土压应变控制;倒Y型混凝土主塔横向在地震中可形成3段塑性区域;斜拉桥混凝土主塔截面应考虑箍筋约束效应影响,该效应能明显增强混凝土主塔横向塑性性能,提高主塔横向抗震性能。
To research on lateral failure mechanism and elastic-plastic performance of the inverted Y-shaped concrete tower for long span bridges,a typical long-span cable-stayed bridge with inverted Y-shaped concrete tower was taken as the prototype,and based on OpenSees nonlinear finite element platform,a nonlinear finite bridge model,considering the main tower's elasticplastic performance,was established.Three observed seismograms were taken as seismic input.Dynamic incremental analysis(IDA)was used to analyze.The results show that under different observed seismic inputs;the lateral yield in the concrete tower of cable-stayed bridge is found at the top section of the beam,which is controlled by tensile strain of reinforcement at the side of core concrete,while the lateral damage in the concrete tower is found at the top section of the beam or at the bottom section of the tower,which is controlled by compressive strain of concrete at the side of core concrete.For an inverted Y-shaped concrete main tower,three plastic zones are formed during the earthquake on the transverse direction.Confinement effect of transverse reinforcement in different sections of the main tower shall be taken into consideration,which can improve the lateral plastic performance and lateral seismic performance of the concrete tower.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2015年第11期52-59,共8页
China Journal of Highway and Transport
基金
国家重点基础研究发展计划("九七三"计划)项目(2013CB036302)
关键词
桥梁工程
斜拉桥
弹塑性分析
抗震性能
bridge engineering
cable-stayed bridge
elastic-plastic analysis
seismic performance