Comparison of FEM Analysis And Experimental Investigation for A 168m Long Steel Double Twin Truss Launching Gantry Subjected To Different Load And Support Conditions

9th International Symposium on Steel Bridges

材料科学;运输工程

Partov, Doncho^1 ; Georgiev, Lazar^2

Department of Mechanics and Mathematics, University of Structural Engineering and Architecture (VSU), Lyuben Karavelov-Sofia, 175 Suhodolska Street, Sofia

1373, Bulgaria^1

Roads and Transport Structural Facilities Department, FTE, University of Architecture Civil Engineering and Geodesy, Hristo Smirnenski Blvd, Sofia

1046, Bulgaria^2

关键词: Axial stiffness;    Experimental investigations;    FEM analysis;    Lower chords;    Steel girder;    Support conditions;    Total length;    Vertical deflections;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/419/1/012025/pdf
DOI  :  10.1088/1757-899X/419/1/012025

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper describes the construction and behavior of a large steel double twin truss launching gantry with total length 168m, designed by Dr. Eng. Borislav Bankov (1912 1992), used for erection of prestressed concrete bridge girders with span up to 60m (weight up to 220ton) along the Hemus highway, Republic of Bulgaria. It consists of two twin frame steel girders and rails on the top and on the bottom flanges for moving the special girder carrying devices. Experimental investigations are performed by the Road Agency and vertical deflections of the mentioned twin truss under different loads and support conditions are measured. 3D FEM of the existing steel twin truss launching gantry considering and neglecting the the increased axial stiffness of the lower chord at truss joint zones are developed by the authors to investigate its behavior under different load and support conditions. Results from these FEM are analyzed, compared with the test results and discussed.