|Table of Contents|

Optimum design method of composite steel truss girder based on efficiency coefficient(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年02期
Page:
86-96
Research Field:
建筑结构
Publishing date:

Info

Title:
Optimum design method of composite steel truss girder based on efficiency coefficient
Author(s):
WANG Kun1;  LIU Yongjian1;  MA Yinping2
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Civil Engineering, Chongqing University, Chongqing 400045, China)
Keywords:
bridge engineering;  composite steel truss girder;  optimization design method;  efficient coefficient
PACS:
U441
DOI:
10.19815/j.jace.2022.05036
Abstract:
Composite steel truss girder has the mechanical characteristics of truss structure, but also affected by the joint performance and plate truss combination. Thus, the mechanism of the girder is complicated. The traditional finite element design method cannot optimize members and joints simultaneously. In order to optimize the design scheme of composite steel truss girder quickly and accurately, an optimization calculation method was presented. The method was based on the preliminary analysis of finite element model(FEM). Considering that the force distribution of the structure was similar, the main truss members were optimized by the bearing capacity efficiency coefficient of members and joints. Then, the optimized scheme was substituted into the finite element model for verification. Based on the existing general atlas of rectangular concrete filled steel tube continuous girder bridge, the design scheme was optimized. The results show that the bending stress caused by the spatial effect of composite steel truss girder can reach 15%-42% of the combined stress, and the influence of the bending moment cannot be ignored. So, the bending moment and axial force should be taken into account when calculating the efficiency coefficient. The efficiency coefficient can directly reflect the stress state of composite steel truss members. The method can quickly locate the optimized members and subdivide the optimization scheme to the plate level according to the section characteristics of the members. The proposed optimization design method can optimize the joints and members of composite steel truss girder, avoid repeated finite element trial calculation, and improve the optimization efficiency significantly.

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Last Update: 2023-03-20