扣件式钢管高大模板支架抗连续倒塌分析  

Analysis on the Progressive Collapse Resistance of Fastener-Style Steel Tube Tall Falsework

作　　者：胡长明[1] 王娟 梅源[1] 袁一力 HU Changming;WANG Juan;MEI Yuan;YUAN Yili(School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055 , China)

机构地区：[1]西安建筑科技大学土木工程学院

出　　处：《建筑钢结构进展》2019年第3期50-55,共6页Progress in Steel Building Structures

基　　金：国家自然科学基金(50978219)

摘　　要：为研究扣件式钢管高大模板支架的抗连续倒塌性能,采用软件ANSYS建立有限元模型,通过撤除不同位置的立杆对高大模板支架的受力性能进行分析,比较了不设置剪刀撑、仅在横向设置剪刀撑及横向和纵向均设置剪刀撑的高大模板支架抗连续倒塌能力。结果表明:在正常使用荷载作用下,安装质量保证的扣件式钢管高大模板支架不会发生连续倒塌;杆件撤除后,其承担的荷载主要由周围的杆件承担;撤除角杆造成的最大需求能力比RDC最大,撤除中杆造成的最大需求能力比RDC最小;剪刀撑能够改变立杆竖向荷载的传递路径,并分担部分竖向荷载,使得立杆的轴力不会同时达到其承载力,避免高大模板支架发生连续倒塌。In order to study the progressive collapse resistance of fastener-style steel tube tall falsework,finite element model is built using ANSYS software.The mechanical performance of tall falsework with removed pole at different locations is analyzed,and the progressive collapse resistance capacity is compared for the tall falseworks without X-bracing,with X-bracings only at transverse direction and with X-bracings both at transverse and longitudinal directions.The results show that under working load,the progressive collapse of fastener-style steel tube tall falsework with guaranteed installation quality will not occur.The loading caused by removed pole will be borne by the poles around the removed pole.The maximum demand to capacity ratio RDC of tall falsework with removed corner pole will reach the largest value,and the maximum RDC of tall falsework with removed center pole will reach the smallest value.X-bracing can change the transfer path of vertical load of poles and bear partial vertical load,causing the axial pressure of poles will not reach the bearing capacity simultaneously and the progressive collapse of the fastener-style steel tube tall falsework can be avoided.

关 键 词：扣件式钢管高大模板支架 连续倒塌 剪刀撑 需求能力比 有限元分析 

分 类 号：TU755.23[建筑科学—建筑技术科学]