|Table of Contents|

Optimal design of steel truss-concrete composite beams based on orthogonal experiment(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年6期
Page:
49-59
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Optimal design of steel truss-concrete composite beams based on orthogonal experiment
Author(s):
WANG Shi-chao1;  LI Yi2;  ZHANG Gang1;  ZHU Jun-sheng1;  PANG Xing-fa1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Bay Area Bridge Maintenance Technology Center, Guangdong Province Highway Construction Co. Ltd., Guangzhou 510000, Guangdong, China)
Keywords:
bridge engineering;  steel truss-concrete composite girder;  orthogonal text;  structure performance;  sensitivity analysis;  optimization design method
PACS:
U442.5
DOI:
10.19721/j.cnki.1671-8879.2023.06.005
Abstract:
In order to accelerate the construction of green transportation, reduce the carbon emission in the construction of steel truss structure bridge, and implement the rapid, economical and reasonable design of steel truss-concrete composite beam structure, a multi-objective optimization design method for the whole structure was proposed which considers structural displacement, component stress and building material consumption. With economic benefits and overall structural performance improvement as objective functions, design parameters of each component in steel truss-concrete composite beams as design variables, combined with constraints such as deflection of steel truss-concrete composite beams and material strength, a multi-objective optimal design mathematical model of steel truss-concrete composite beams was established. The key design parameters, such as the vertical height of steel truss, the longitudinal panel length of steel truss, the width of chord section, the height of chord section, the width of diagonal section, the height of diagonal section and the thickness of bridge deck, were selected to analyze the sensitivity of the main section deflection of the whole structure and the maximum stress of key components to the change of key design parameters. Based on the results of sensitivity analysis, 32 groups of orthogonal experiments were designed by selecting key design parameters as orthogonal experimental factors. The calculation method of the optimization and evaluation coefficient of steel truss-concrete composite beam was put forward, and 32 groups of orthogonal test results were evaluated, the main and secondary order of the influence of design parameters on the optimization and evaluation coefficient was determined, the correlation law between structural performance and economic benefit in the design of steel truss-concrete composite beam was clarified, and the optimal design parameter combination of steel truss-concrete composite beam was obtained. The results show that the optimized structural steel dosage is 976.03 t, which saves about 5.1% compared with that before optimization, the vertical deflection of the structure decreases about 11.38%, and the maximum stress reduction of the member is 14.09%. The structural optimization design method based on orthogonal test is suitable for the multi-objective optimization design of steel truss-concrete composite beam structure, and can help realize the national ‘double carbon' strategic goal.7 tabs, 9 figs, 28 refs.

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Last Update: 2023-10-30