摘要
主要研究搭设参数和构造措施对扣件式高大模板支架极限承载力的影响。计算分析竖向剪刀撑间距和搭设参数对失稳特征的影响,提出立杆超出顶层水平杆长度、立杆步距、立杆间距和竖向剪刀撑间距是影响临界荷载的主要因素;在考虑立杆间距和竖向剪刀撑间距对临界荷载和失稳模态的影响后,提出了合理的构造措施;按照普通钢结构的验收标准,进行模板支架的非线性(包括几何非线性和材料非线性)极限承载力计算,给出立杆计算长度计算公式;最后考虑较低的检查和验收标准,提出极限承载力的计算方法。
The ultimate capacity of a high steel falsework is investigated.According to the analysis of elastic buckling property of falsework with different design parameters and the spacing of vertical cross braces,it is found that the critical load and buckling model shape are very sensitive to the extension length of the vertical tube over horizontal tubes,the row spacing of vertical tubes,the lift height and the spacing of vertical cross braces.A reasonable measure in erection is proposed according to the effect of spacing of vertical braces and row spacing on the critical load.Considering the large deformation effect and material nonlinear property,the ultimate capacity analyses are taken and a formula for the calculated length of a vertical tube is given.Finally,According to the standard for checking and accepting of high falseworks,a formula for computing the ultimate capacity is proposed.
出处
《工程力学》
EI
CSCD
北大核心
2010年第A01期254-259,共6页
Engineering Mechanics
基金
2009年住房和城乡建设部安全质量监督专项经费项目(2009-09)
关键词
高大模板支架
极限承载力
搭设参数
构造措施
立杆计算长度
high falsework
ultimate capacity
design parameters
construction details
calculated length of vertical tube
