|Table of Contents|

Interface working coordination and overall mechanical properties of steel truss-concrete composite girders(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:
77-89
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:
Interface working coordination and overall mechanical properties of steel truss-concrete composite girders
Author(s):
ZHAO Xiao-cui;  ZHANG Gang;  WANG Bao-ying;  WANG Shi-chao; TANG Chen-hao;  ZHANG Yong-fei
(School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China)
Keywords:
bridge engineering;  steel truss-concrete composite girder;  fine analysis;  interface working coordination;  mechanical property;  PC slab;  sensitivity
PACS:
U411
DOI:
10.19721/j.cnki.1671-8879.2022.06.008
Abstract:
In order to deep study the interface working coordination and overall structure mechanical properties of steel truss-concrete composite bridge girders, and establish a concise calculation method for engineering applications, a steel truss-concrete composite continuous girder was selected as research object and refined finite element analysis method was adopted. A three-dimensional numerical model of steel truss-concrete composite girder was established by the combination of multi-dimensional elements. Five groups of shear studs which at the middle span fulcrum section and 2 m away from it sections, and at the side span middle section and the side span fulcrum section were used as the analysis objects, the load-slip relationship curves of shear studs with different diameters were calculated. The influence degree of the strength and thickness of prestressed concrete bridge slab(PC slab for short), and the form of shear studs on the interface slip between PC slab and steel truss was studied. The sensitivity of the interface working coordination to each parameter was proposed based on Pearson correlation coefficient, and a calculation formula of interface slip was proposed, considering the strength and thickness of PC slab and the form of shear studs. Then overall mechanical properties of steel truss-concrete composite girders were determined by the variation characteristics of deflection and stress. And the maximum deflection prediction formula of overall structure of composite girder was proposed. The results show that with the increase of strength of PC slab, interface slip decreases when the load is small, and increases when the load is large. Thickness of PC slab has no obvious influence on the interface slip, while the form of shear studs exerts direct effect on the interface slip, smaller diameter of shear studs can cause worse interface working coordination of PC slab and steel truss. The maximum deflection in composite girder decreases with the increase of strength of PC slab, decreases first and then increases with the increase of thickness of PC slab. Shear studs has little influence on the maximum deflection of composite girders. Furthermore, the strength variation of PC slab has little influence on the maximum normal stress of steel truss, but the influence range on the maximum compressive stress of PC slab is more than 20%. Interface local working and overall mechanical properties of composite girders are more balanced when the ratio of PC slab thickness to steel truss height is between 0.050 6 to 0.053 2. The proposed calculation formula is concise,and research results can provide a theoretical basis for life cycle construction and safe operation, and maintenance of steel truss-concrete composite bridge girders.2 tabs, 12 figs, 29 refs.

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Last Update: 2022-12-20