大跨度斜拉桥弹塑性地震响应分析及抗震性能评价  

Analysis on Elastic-plastic Earthquake Response of Long-span Cable-stayed Bridge and Evaluation onEarthquake-resistant Performance

作　　者：奚灵智[1] 李小刚[1] 韦华[1] 

机构地区：[1]中国水电顾问集团华东勘测设计研究院,浙江杭州310014

出　　处：《城市道桥与防洪》2011年第11期41-48,149,共8页Urban Roads Bridges & Flood Control

摘　　要：以骑骡沟大桥斜拉桥方案为背景,建立考虑材料非线性的纤维单元模型,对预应力混凝土主梁和钢筋混凝土主塔进行弹塑性地震响应分析和非线性抗震能力的评估,计算分析表明:考虑材料非线性后,主梁的面内、外弯矩以及主塔的轴力、面内、外弯距均有较大程度地降低,主梁纵向位移以及主塔的面内、外剪力均由不同程度的提高。Taking the cable-stayed bridge scheme of Qilougou Bridge as the background, the nonlinear fiber element model considering material is set up to analyze the elastic-plastic earthquake response of the main prestressed concrete beam and the main steel reinforced concrete pylon, and to evaluate the nonlinear earthquake resistant capacity. The calculation analysis shows that the in-plane and external bending moment of the main beam and the axial force, in-plane and external bending moment of the main pylon reduce to greater extent, and the longitudinal displacement of the main beam and the in-plane and external shear of the main pylon enhance to different extents.

关 键 词：斜拉桥 地震响应 弹塑性 抗震性能 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]