基于应变能法的大跨度钢桁架四吊点选取分析

Selection of four hoisting points for large-span steel trusses based on strain energy method

对应变能法应用于吊点选择进行了可行性分析,并根据结构吊装吊点约束数量,在所有节点变量空间内进行组合计算,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3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。

The strain energy method is applied to hoisting point selection in structural hoisting, and the feasibility of this method is investigated. Based on the number of hoisting points, a structural analysis is carried out for each possible combination of hoisting points in the whole variable space of nodes. The strain energy corresponding to the each combination is obtained based on the member forces from the structural analysis. The combinations are sorted based on their magnitudes of strain energy, and the combination with the smallest strain energy is picked out. The structure needed to be hoisted is in a rational state when it has low strain energy. The combination with the smallest strain energy is treated as the best selection of hoisting points. Hoisting construction of a workshop in Chongqing was taken as an example and three construction conditions were considered. The commercial package ANSYS was used to conduct the structural analysis and obtain the strain energy. The best selections were verified by another software MADIS.