大跨度连续刚架-拱组合结构桥梁的纵向地震响应研究

以广州新光大桥为例，建立了空间杆系模型，利用动态时程分析方法，详细分析了大跨度连续刚架-拱组合结构桥梁在纵桥向地震一致激励和行波效应作用下的地震响应。研究表明除边墩外，行波效应对拱肋上、下弦杆以及V型刚架斜腿地震内力响应均有较大影响；随着剪切波速的增加主拱顶相对拱脚的最大纵向位移呈递减趋势，而边拱顶相对拱脚的最大纵向位移基本不受剪切波速的影响。

Study of longitudinal seismic response for long-span combined bridge of continuous rigid-frame and arch structure

Take Guangzhou Xinguang Bridge as an example, a spatial beam FEM model is established to analyze in detail longitudinal seismic respcnses of long-span combined bridge of continuous rigid-frame and arch structure under the action of consistent and traveling wave by dynamic time-history method. It is found that except for side piers traveling wave effect has great influence on seismic nspenoes of key members of the bridge, such as upper and lower chords of arch ribs and slant legs of V-shaped rigid-frame. With the increasing of shear wave speed, the maximum longitudinal relative displacements of crown of main arch to arch foot are decreasing gradually, however, the shear wave speed almost has no influence to the maximum longitudinal relative displacements of crown of side arch to arch foot.