中小跨径典型梁式桥抗震结构体系优化研究

Seismic Structural System Optimization of Typical Beam Bridge with Medium and Small Span

文中以坪汉高速黄泥坪大桥为工程背景,采用CSIBridge 3D桥梁软件建立全桥模型,分析桥梁的墩柱位移、塑性转角、延性墩剪力等抗震性能参数.通过分析同一联相邻和不相邻墩柱刚度差异、相邻联墩柱周期平衡性能的差异对墩柱的刚度均衡及框架进行优化,通过分析柱间横系梁对结构的影响,提出柱间横系梁的优化措施,并验算优化柱间横系梁对结构稳定性的影响.结果表明:对于中小跨径的山区典型梁式桥,以提高其抗震性能为目的,结构体系的优化措施有:保证墩柱的刚度设计尽可能平衡,在桥墩受力满足要求前提下优化柱间横系梁.

Taking Huangniping Bridge of Pinghan Expressway as the engineering background,the whole bridge model was established by CSIBridge 3D bridge software,and the seismic performance parameters such as pier displacement,plastic corner and ductile pier shear force of the bridge were analyzed.By analyzing the difference of stiffness between adjacent and non-adjacent piers and the difference of periodic balance performance of adjacent piers,the stiffness balance of piers and the frame were optimized.By analyzing the influence of cross-beam between columns on the structure,the optimization measures of cross-beam between columns were put forward,and the influence of optimized cross-beam between columns on structural stability was checked.The results show that,for the typical beam bridge with medium and small span in mountainous areas,in order to improve its seismic performance,the structural system optimization measures are as follows:the stiffness design of piers and columns should be balanced as much as possible,and the cross tie beam between columns should be optimized on the premise that the force of piers meets the requirements.