Experimental study on load bearing behavior of grid structures with assembly stresses

被引：0
|
作者：
Du X. [1 ]
Liu W. [1 ]
Yuan H. [1 ]
Liu M. [1 ]
Cheng X. [1 ]
机构：
[1] School of Civil Engineering, Wuhan University, Wuhan
来源：
Yuan, Huanxin (yuanhx@whu.edu.cn) | 2018年 / Science Press卷 / 39期
关键词：
Assembly stress; Finite element analysis; Grid structure; Load bearing behavior; Safety factor; Static test;
D O I：
10.14006/j.jzjgxb.2018.07.001
中图分类号：
学科分类号：
摘要：
The influence of assembly stresses on the load bearing behavior of grid structures was experimentally and numerically studied. Two orthogonal spatial square pyramid grids with dimensions of 7m×12m and 5m×12m were tested separately and corresponding finite element (FE) analysis was carried out. It is revealed that the ultimate load bearing capacities of grid structures are undermined significantly owing to the assembly stresses. The influence coefficient of assembly stresses on the ultimate load bearing capacity was obtained according to parametric analysis of 204 plate grid models and 140 double-layer cylindrical lattice shells. A total of 38 potentially unstable double-layer spherical reticulated shells and double-layer cylindrical lattice shells were analyzed by means of FE analysis, revealing the reasonable range for the safety factor. It is shown that there are remarkable differences between the structural performances of the perfect models and the tested ones, such as global deformations, structural stiffness, ultimate load bearing capacities. It can be found that the coefficient conforms to a normal distribution. The value of the coefficient is equal to 0.5 for the plate grid, while this value should be taken as 0.55 for the double-layer cylindrical lattice shells. A value of 2.0 is suggested for the safety factor once the initial imperfection of assembly stresses and the Marshall model are introduced. Since the effect of assembly stresses has not been explicitly considered by design provisions in JGJ 7-2010 'Technical specification for space frame structures', a higher value of 3.0 is proposed. © 2018, Editorial Office of Journal of Building Structures. All right reserved.
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页码：1 / 10
页数：9
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