|Table of Contents|

Stiffness calculation of joint in steel truss-concrete composite girder(PDF)

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

Issue:
2022年6期
Page:
121-132
Research Field:
桥梁工程·交通基础设施智能化运维技术专栏
Publishing date:

Info

Title:
Stiffness calculation of joint in steel truss-concrete composite girder
Author(s):
LU Ze-lei1;  ZHANG Gang1;  ZHOU Li1;  MA Yan-yang2;  WAN Hao1;  WANG Shi-chao1
(1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. China Railway Construction Shaanxi Expressway Co., Ltd, Xi’an 710064, Shaanxi, China)
Keywords:
bridge engineering;  steel truss-concrete composite girder;  numerical prediction;  truss-plate joint stiffness;  calculation method;  stability performance
PACS:
U441
DOI:
10.19721/j.cnki.1671-8879.2022.06.012
Abstract:
With the opportunity of construction and development of low-carbon and environment-friendly bridge steel truss-concrete composite girder, to further explore the stability of large gusset plate(truss-plate joint)in three-dimensional truss structure of steel truss-concrete composite girder and its influence on the overall structural performance. The refined solid model of the three-dimensional truss-plate joint and beam-solid composite structure were constructed, when considering the actual stiffness of welded joints. The moment-rotation curves of web member, chord and horizontal connection around strong axis and weak axis at the welded joint were calculated. Several sensitive parameters affecting the rotational stiffness of truss-plate joint were analyzed, and the variation laws of joint initial stiffness with the thickness of gusset plate, axial compression ratio and welding residual stress was revealed. The calculation method of truss-plate joint stiffness was established. On this basis, the change of joint rotational stiffness, which caused by joint plate thickness, axial compression ratio and welding thermal stress, and effects of joint rotational stiffness on the overall stability of steel truss-concrete composite girder were studied. Overall structure safety reserve of steel truss-concrete composite girder was obtained. The results show that the semi-rigid characteristics of steel truss welded joints are obvious. The formulas for the influence of truss-plate joint stiffness on the stability of overall structure were proposed. When the members rotate along the strong axis of the section, they have great strength and flexural stiffness, which in the weak axis are smaller. When the thickness of gusset plate increases from 20 to 40 mm, initial stiffness of truss-plate joint increases by 39.49%, ultimate rotation angle decreases by 46.40%, and the first-order buckling eigenvalue of the whole structure increases by 342.95%. When the axial compression ratio increases from 0 to 0.8, initial stiffness of truss-plate joint decreases by 12.20%, ultimate rotation angle decreases by 24.43%, and the first-order buckling eigenvalue of the whole structure decreases by 55.48%. Considering the welding residual stress, initial stiffness of truss-plate joint decreases by 8.63%, ultimate rotation angle decreases by 26.01%, and the first-order buckling eigenvalue of the whole structure decreases by 4.90%. The proposed formulas are simple and practical, the research results will provide theoretical basis for the whole life design and construction of steel truss-concrete composite continuous girder.4 tabs, 11 figs, 34 refs.

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Last Update: 2022-12-20