节点半刚性对扣件式钢管模板支架稳定承载力的影响分析  

INFLUENCE OF SEMI-RIGID JOINT ON STABILITY CAPACITY OF COUPLER STEEL TUBE FALSEWORK

作　　者：胡长明[1] 车佳玲[1] 张化振[2] 董攀[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]北京中冶设备研究设计总院有限公司,北京100029

出　　处：《工业建筑》2010年第2期20-23,共4页Industrial Construction

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

摘　　要：通过扣件节点半刚性试验,得到节点扭转刚度Rk与直角扣件螺栓拧紧力矩T的关系式。研究表明:在考虑扣件节点扭转刚度的前提下,采用SAP 2000有限元软件建立支架模型,并在模型的每个节点上施加稳定承载力0.1%的等效假想水平力用来模拟架体的初始缺陷,可以精确地验算架体的稳定承载力。对比计算结果和试验结果发现:考虑扣件节点的半刚性是精确计算模板支架稳定承载力的前提。同时,当扣件拧紧力矩小于30 N.m时,支架稳定承载力呈明显下降趋势。因此,在施工过程中,应对扣件的扭紧力矩进行严格检验。Based on the semi-rigid joint experiment,it was gained the formula of initial torsion stiffness Rk and bolt tightening moment T of right-angle coupler. On the basis of considering semi-rigid joint, it is indicated that it is rational to use imaginary horizontal force of 0.1 % stability capacity in every joint to simulate initial imperfections of the frame by finite element software. Combining with the contrast of finite element analysis results and experimental results,it is the prerequisite to calculate stability capacity exactly with semi-rigid joint of falsework considered. At the same time, the descending trend of stability capacity of the falsework was evident when tightening torques of the couplers is less than 30 N.m. Therefore, during the construction process, it is indispensable to sampling inspections of the tightening torques of the couplers strictly.

关 键 词：扣件式模板支架 节点 半刚性 稳定承载力 扭转刚度 

分 类 号：TU755.23[建筑科学—建筑技术科学]