扣件式钢管模板支架的试验和数值模型研究  

A STUDY OF EXPERIMENT AND NUMERICAL MODEL ON COUPLER STEEL TUBE FALSEWORK

作　　者：胡长明[1] 曾凡奎[2] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]青岛农业大学建筑工程学院,青岛山东266109

出　　处：《工程力学》2010年第A02期280-283,293,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(50978219);陕西省教育厅专项科研计划项目(08JK333)

摘　　要：目前模板支架的设计计算理论尚不完善,模板支架的安全使用难以保证,导致近年来模板支架的坍塌事故时有发生。该文对模板支架进行足尺试验研究,得到其极限承载力和失稳模式,发现模板支架在竖向荷载作用时,由于杆件缺陷和节点特性,横杆和剪刀撑仍然承受一定的内力,并提出了广义初始缺陷的概念。在数值计算时,采用通用有限元软件ANSYS根据试验中的模板支架建立三维杆系计算模型,将广义初始缺陷等效为假想水平力,进行非线性稳定承载力分析,试验和数值分析结果表明:在进行模板支架的计算时应该考虑广义初始缺陷对结构稳定性的影响,也表明建立的三维有限元模型是合理的,为开展系统的研究打下了良好的基础。Due to the imperfections in calculation theory of a falsework design,it is difficult to ensure safety in its application,and consequently,occasional collapses of falsework arise.The paper makes a full-scale experimental study on falsework,obtains the limited bearing capacity and the instability mode,finds that when falsework is under the vertical load,the horizontal pole and scissors bar still bear a certain degree of internal forces owing to the imperfections of members and properties of nodes,and presents the concept of a generalized initial imperfection.In the numerical calculations,the study adopts the general finite element software ANSYS to set up a three-dimensional trussing calculation model on the basis of the experimental falsework,makes the generalized initial imperfection equivalent to the imaginary horizontal force and analyzes the nonlinear stability capacity.The experimental and analytical results show that the influences of the generalized initial imperfections on the structural stability should be taken into consideration in calculating falsework,and it is justifiable to set up the three-dimensional finite element model.The study lays a good foundation for the further research.

关 键 词：模板支架 足尺试验 有限元分析 半刚性 广义初始缺陷 

分 类 号：TU755.2[建筑科学—建筑技术科学]