一种基于静力位移测量值的车辐式屋盖结构索力识别方法  

A CABLE FORCE ESTIMATION METHOD FOR SPOKE STRUCTURAL ROOF BASED ON STATIC DISPLACEMENT MEASUREMENT

作　　者：郭彦林[1] 田广宇[1] 王昆[1] 张博浩[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2013年第2期96-103,共8页Engineering Mechanics

摘　　要：该文从车辐式张拉屋盖结构的组成特点出发,提出了一种基于静力位移测量值的索力识别方法。首先通过测量屋盖结构的几何位形,建立有限元模型。然后给真实结构施加特定荷载并测量加载点位移。给有限元模型施加同样的荷载并计算其位移。通过比较计算和实测的位移值,修正并迭代有限元模型中拉索的预应力;当计算位移与实测位移一致时就获得了拉索的真实内力。该方法只需要测量加载的自由度所对应的位移,能够在通用有限元软件ANSYS上进行索力识别,计算结果准确。With respect to the topological property of spoke structures, this paper presents a cable force estimation method based on static displacement measurement. A finite element model is established by measuring structure＇s configuration. Certain loads are applied on real structure and the corresponding displacements are measured. The same loads are applied on finite element model and its nodal displacements are calculated. According to the difference between calculated and measured displacement, the pre-stresses of cables model are adjusted and iterated in the finite element model. Real cable forces could be obtained as calculated displacements are equal to the measured ones. Only displacements at degrees of freedom where the loads are applied need to be measured. This method can be achieved with general finite element program ANSYS, and the estimated cable force is deemed accurate.

关 键 词：索结构 索力识别 静力位移 预应力 有限元法 

分 类 号：TU394[建筑科学—结构工程]