基于气动弹性模型风洞试验位移测量结果的桥梁抖振内力计算方法

Internal Force Calculation Method of Bridge Buffeting Based on Bridge Aerodynamic Elastic Model Wind Tunnel Test

文章以宁波象山港大桥的全桥气动弹性模型风洞试验为背景,依据试验实测位移数据谱分析的结果,选取竖弯一阶、二阶、三阶振型,侧弯一阶、二阶振型和扭转一阶振型,通过振型分解和叠加的方法,求出不同时刻的振型广义坐标时程信号。提出了如何从气动弹性模型试验中测到的有限截面上抖振位移响应时程推算全桥抖振内力响应的方法。

Based on the wind tunnel test of Xiangshan Bay bridge aerodynamic elasticity model,the whole bridge model is established in ANSYS and modal analysis is completed.Then According to the whole bridge displacement spectrum analysis of Xiangshan Bay model experiment report,select vertical bending vibration mode of first-order,second-order and threeorder,transverse vibration bending mode of first-order and second-order and reverse vibration mode of the first-order,by modal decomposition and superposition method,calculates the generalized coordinate signals of different time.Displacement of limited cross section from the aerodynamic elastic model calculated displacement of arbitrary cross section by using least square method.The method of estimating the full-bridge buffeting internal force response from the buffeting displacement response time history on the finite section measured from the aeroelastic model test is presented.