高烈度地震区大跨度悬索桥中央扣形式的选择与创新

以雅康高速公路泸定大渡河特大桥为研究背景，建立该桥的空间动力计算模型，采用非线性时程分析方法研究了刚性中央扣、柔性中央扣和耗能中央扣三种形式对结构抗震性能的影响。耗能中央扣首次将防屈曲耗能钢支撑构件应用于悬索桥，利用钢材良好的滞回耗能性能消耗地震输入能量，保护桥梁主体结构免遭破坏。研究结果表明耗能中央扣的综合性能大大优于传统的刚性中央扣和柔性中央扣，是适用于高烈度地震区大跨度悬索桥的一种理想的中央扣形式。

Selection and innovation of central buckle form of long span suspension bridge in high intensity earthquake area

Taking the Luding Dadu River Bridge of Yakang Expressway as the research background, the spatial dynamic calculation model of the bridge is established, and the influence of rigid central buckle, flexible central buckle and energy-consuming central buckle on the seismic performance of the structure is studied by using nonlinear time-history analysis method. The energy dissipation central buckle is the first time to apply the anti-buckling energy dissipation steel supporting member to the suspension bridge, using the good hysteretic energy dissipation performance of steel to consume the seismic input energy and protect the main structure of the bridge from damage. The results show that the comprehensive performance of energy-dissipating central buckle is much better than that of traditional rigid central buckle and flexible central buckle, and it is an ideal central buckle suitable for large-span suspension Bridges in high-intensity earthquake area.