基于实测索力的模型斜拉桥有限元模型修正研究  

Research on Updating of Cable-stayed FE Bridge Model Based on Measurements of Cable Tensions

作　　者：李延强[1,2] 杜彦良 符强[2] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044 [2]石家庄铁道大学工程力学系,河北石家庄050043

出　　处：《铁道学报》2013年第6期91-95,共5页Journal of the China Railway Society

基　　金：国家自然科学基金(50778116);河北省科学技术研究与发展计划项目(11215611D);河北省人力资源和社会保障厅项目(436018);河北省自然科学基金(E2012210061);河北省教育厅重点项目(Zh2012068)

摘　　要：斜拉索作为斜拉桥结构的主要受力构件,对桥梁结构的受力影响重大。本文以实验室独塔斜拉桥模型为研究对象,展开基于索力实测的斜拉桥结构有限元模型修正技术研究。建立基于ANSYS平台的模型斜拉桥板壳模式的初始有限元模型,对模型斜拉桥进行静力荷载试验,测试各工况下的斜拉索索力,并以实测索力为主要修正对象,位移响应为次要修正对象,基于结构参数进行灵敏度分析,得到模型斜拉桥的主要和次要修正参数。运用ANSYS优化模块,对模型斜拉桥初始有限元模型进行修正,修正后的有限元模型各工况下计算索力、位移与实测索力和位移吻合良好。修正后的结构参数物理意义明确,修正后的有限元模型可以作为基准模型,用于后续的损伤识别研究。所提方法可供大跨斜拉桥结构有限元模型修正参考借鉴。As a major stressed member, the inclined cable is of utmost importance to the stressed conditions of the cable-stayed bridge. In this paper,taking a single pylon cable-stayed bridge model as the object of laboratory tests,the updating technique of the FE model of cable-stayed bridge structure was studied on the basis of measurements of cable tensions. The initial FE model was set up in the shell mode on the ANSYS plat- form. Static loading tests were made with the initial model. Cable tensions were measured under different operating conditions and were dealt with as the primary updating objectives whereas displacement responses were taken as the secondary updating objectives. By analysis of the sensitivity of structural parameters, the primary and secondary updating parameters of the initial model were obtained. By using the optimized ANSYS modules the initial FE model was updated. With the initial model updated for different operating conditions, the calculat- ed cable tensions and displacements were all consistent with the measured cable tensions and displacements and the structural parameters carried explicit physical meanings. The updated FE model can be used as the reference model in later bridge damage detection researches. The proposed method provides reference to updating of large-span cable-stayed FE bridge models.

关 键 词：模型斜拉桥 静力荷载实验 模型修正 优化方法 

分 类 号：U445.4[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]