大跨度屋盖钢结构拆撑过程模拟分析的约束方程法  

Constraint Equation Method for Analysis of Removing Temporary Supports From Large-Span Steel Roof

作　　者：郭小农[1] 邱丽秋[1] 罗永峰[1] 叶智武[1] 罗立胜[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《应用数学和力学》2013年第9期986-994,共9页Applied Mathematics and Mechanics

基　　金：国家自然科学基金资助项目(51078289)~~

摘　　要：分类介绍了目前在大跨度屋盖钢结构拆撑过程模拟分析中常用的几种方法(即支座位移法、等效杆端位移法、千斤顶单元法和千斤顶-间隙单元法)及其特点,针对现有方法的不足,提出了一种新的拆撑过程模拟计算方法——约束方程法.分别采用已有模拟方法和该方法对一个三点支撑的两端固定梁进行了拆撑过程模拟分析;对采用各种模拟计算方法得到的千斤顶轴力、支撑点位移以及梁中弯矩进行比较,验证了该文方法的有效性.数值分析结果表明,约束方程法是一种合理有效的模拟方法,能够正确模拟大跨度屋盖钢结构拆撑过程计算模型中的卸载单元.Four calculation methods for numerical simulation analysis of removing temporary supports from large-span steel roof were introduced support displacement method, equiva- lent rod bottom-end displacement method, jack element method and jack-gap element method. Then a new method, constraint equation method, was proposed. All the methods mentioned a- bove were used separately to analyze the process of removing temporary supports from a three- point-support beam which was fLxed at both ends. The comparisons of results obtained by these methods indicate that the proposed Constraint equation method is rational and effective for ac- curate simulation analysis of removing ~emporary supports to steel structural roof.

关 键 词：大跨度钢结构 拆撑过程模拟分析 千斤顶卸载单元 约束方程法 

分 类 号：TU311.41[建筑科学—结构工程]