单T刚构加劲钢桁组合结构桥弹塑性地震反应分析

Elasto-plastic Earthquake Response Analysis of Single-T Rigid Frame and Steel-truss Composite Structure Bridge

梁桁组合结构桥相对于梁式桥增加了杆系结构,使其整体刚度有所增加,但受力变的更为复杂.采用了弹塑性地震反应分析方法对其进行了地震反应分析.结果表明:此种组合结构桥梁不仅保持了刚构桥的抗震优点并通过桁架增加了结构的整体刚度,在进行弹塑性地震分析时墩顶和墩底均出现了塑性铰,结构进入塑性屈服状态,耗能明显,总体来说抗震效果比较理想.

Compared wih the girder bridge,the beam-truss composite structure bridge adds the member structure,so its integral rigidity increases and its force becomes more complex.Its earthquake response is analysed by the elasto-plastic earthquake response analysis.The result indicates that the composite structure bridge not only keeps the anti-seismic advantage of rigid bridge,but also increases the structural integral rigidity through truss.During the elasto-plastic seismic analysis,the plastic hinge appears both on the top of the pile and at the bottom of the pile,and the structre gets into the plastic yield state with an obvious consumption.Overall,the anti- seismic effect is satisfed.