澳凼第三大桥斜拉桥的非线性地震反应及TMD初步控制研究

A STUDY ON The NONLINEAR SEISMIC RESPONSE AND TMD CONTROL OF CABLE-STAYED BRIDGE OF THE THIRD AODANG BRIDGE IN MACAO

本文结合一座澳门澳第三大桥斜拉桥的工程设计实例 ,采用大型有限元分析软件ANSYS ,选取空间BEAM188和BEAM4单元建立动力计算模型。为了分析斜拉桥的材料非线性地震反应 ,采用转动弹簧COMBIN40单元来模拟桥墩延性塑性铰的非线性性能。用编好的选波程序合理地选取三条地震波 ,在大震情况下沿桥的纵、横向分别输入 ,并把桥的非线性地震反应与线性地震反应作了分析比较。另选取MASS2 1和COMBIN14单元对斜拉桥进行了TMD初步控制研究 ,研究结果表明减震效果明显。

The engineering design case about a cable-stayed bridge of the 3rd Macao-Taipa bridge is investigated in this paper,by the great FEM analysis software ANSYS,choose the 3-D elements,including element BEAM188 and element BEAM4,to create the dynamic calculation model.In order to analyze the material nonlinear seismic response of the cable-stayed bridge,the nonlinear behavior of ductile plastic hinges of piers is taken into account by using the nonlinear rotational spring element COMBIN40.under the major earthquake,three earthquake ground motion records properly are selected by a wave-choosing program and input into the bridge structure at longitudinal and lateral sides,respectively.The comparisons of the linear and nonlinear seismic responses of cable-stayed bridge are made.In addition,the primary study on TMD cntrol is carried out by choosing element MASS21 and element COMBIN14,it is shown that the effects of mitigation monitoring are evident.