【摘要】 以摩擦摆支座隔震桥梁为对象,采用有限元软件Midas Civil研究摩擦系数、滑道半径以及地震波周期、加速度幅值对摩擦摆支座滑动位移的影响,采用线性拟合方法得到滑动位移的优化计算公式,得到不同抗震区域滑动位移的选取方法。同时采用Matlab对隔震桥梁双自由度力学模型进行地震响应求解,研究滑动位移优化选取方法对桥梁地震响应中主梁位移响应幅值计算精度的影响。结果表明:地震波周期、加速度幅值对滑动位移的影响较大,而摩擦系数、滑道半径对滑动位移影响相对较小。将采用滑动位移传统推荐公式得到的主梁位移响应幅值与有限元法结果比较最大误差可达到67.6%;而采用优化后公式得到的最大误差可减小到10.1%以内,且各地震波作用下主梁位移响应幅值随摩擦系数变化的趋势与有限元法基本一致,同时优化后理论方法与有限元法得到的主梁位移响应曲线具有较好的重合度。更多还原

【Abstract】 Taking friction pendulum bearing isolated bridge as research object,the influence of friction coefficient,slide radius,seismic wave period and acceleration amplitude on sliding displacement of friction pendulum bearing is studied by using finite element software Midas Civil. A optimal formula of sliding displacement is obtained by linear fitting method. A selection method of sliding displacement in different seismic regions can be obtained. Matlab is used to solve the seismic response of isolated bridge with two degree of freedom mechanics model. The influence of the sliding displacement optimization method on the accuracy of main beam displacement amplitude in the seismic response of bridge is studied. The result shows that influence of seismic wave period and acceleration amplitude on sliding displacement is larger,the influence of friction coefficient and slide radius on sliding displacement is relatively small. Compared with the finite element method,the maximum error of the main beam displacement amplitude obtained by the traditional formula is 67.6%,the maximum error can be reduced to less than 10.1% by using the optimized formula. Under different seismic waves,the main beam displacement amplitude trend in different coefficient of friction is in close agreement with the finite element results. The displacement response curves of the main beam obtained by the optimization method and the finite element method have good coincidence degree.更多还原