基于应变能法的大跨度钢桁架四吊点选取分析.docVIP

基于应变能法的大跨度钢桁架四吊点选取分析 姚刚 谢巍 居虎 （重庆大学土木工程学院，重庆400045） 【摘要】：本文对应变能法运用在选择吊点中的进行了可行性分析，利用应变能方法应用于结构吊装，根据吊点约束数量，在所有节点变量空间里面进行组合计算，通过计算得到的内力结果计算桁架的应变能，对不同的应变能结果进行排序，得到最小的应变能，这时结构单元的杆件内力和节点位移都处于一个较合理的状态，吊点约束组合就可以认为是最佳吊点组合。结合重庆某厂房工程，运用ANSYS软件的进行应变能数值模拟分析，并对得出的吊点使用MIDAS软件分析验证了三种施工工况条件下大跨度钢桁架分段吊装施工的应力应变情况，保证了吊点选取的安全性和科学性。 【关键词】：应变能法；钢桁架；四吊点；工况分析 Selection analysis of four hoisting points in the great span steel truss based on the strain energy principle YAO Gang, XIE Wei，JU Hu (Faculty of Civil Engineering, Chongqing University, Chongqing 400045, China) Abstract: This article introduced the feasibility analysis of the strain energy method which is used in the selection of hoisting points, the method making use of the strain energy applies to structure hoisting, restrain quantity according to hoisting point, the combination being in progress in all node variables space inside secretly schemes against , will calculate is under the smallest strain energy combination four to hang a combination, will analyze and obtains the structural unit the member endogenic force and the nodal displacement is at the reasonable condition, therefore should hang the restraint combination to be possible to think that hangs a combination best. Unifies a Chongqing workshop project, carries on the strain energy numerical simulation analysis using the ANSYS software, and to obtained hoisting point to use the MIDAS software analysis to confirm stress strain situation of the great span steel truss partition hoisting construction under three kind of construction working condition, had guaranteed hung a selection the security and the scientific nature. Key words: strain energy principle; steel truss; four hoisting points; working condition analysis 决定大跨度桁架结构的吊装方案时，吊点的选择和吊点的分布是首先要考虑的问题。吊点的选择和吊点的布置要保证起吊后的桁架在起吊后的桁架在自重作用下的变形接近零，以便于桁架的就位安装。一般来说吊点的布置要考虑以下几点：① 吊点要在桁架的重心之上，这样起吊后不会出现头重脚轻而倾覆。② 吊点不能过于接近，否则容易使桁架两端变形过大，这样会导致拼接的时候无法到位。③ 吊点的选择应该使钢桁架的变形[1]和弯矩分布比较均匀，且数值较小。 1 应变能法与传统经验方法选取吊点的比较 常见的建筑施工的吊装对象大都是钢筋混凝上柱(桩)或者是