大跨度斜拉桥弹塑性地震响应分析及抗震性能评价

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。

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

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.