Fatigue loading device for welded joints of steel truss bridges under multiaxial loads

Abstract

The invention relates to a fatigue loading device of a steel truss bridge welded joint under a multi-axis loading effect. The fatigue loading device comprises three main parts including an end combined type bearing framework, a hydraulic jack and a precision force sensor, wherein the end combined type bearing framework comprises four parts including a framework base, a framework arm, a circular disc linking part and a fixed anchor block; the hydraulic jack is fixed on the framework arm by bolting between an additional steel plate and a pull rod of the framework arm; the precision force sensor is arranged between the hydraulic jack and a steel truss bridge welded joint member; the fixed anchor block adopts a groove-shaped steel block and is used for bolting and anchoring the steel truss bridge welded joint member; the angle of the framework arm can be adjusted under the control of a hinging system composed of the circular disc linking part, a hollow thin-wall cylinder and a solid cylinder; and the length of the framework arm can be adjusted so that the aim that complicated steel truss bridge welded joint members with different angles can be accurately loaded, and the operation is simple.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a fatigue loading device for complex welded joints of steel truss bridges under multiaxial loads. Background technique [0002] Complex welded joints have been applied in steel truss bridges built in my country in recent years because of their good overall performance, saving steel and high-strength bolts, beautiful appearance, convenient installation on site, and improving the degree of factory manufacturing of steel girders. However, due to the large number of members intersected by this type of node, the structure is complex, and it is in a typical multi-axial load and space-complex force state, its fatigue performance determines the safety and durability of the entire bridge. Under loads such as load and wind load, complex welded joints will crack or even break due to multiaxial fatigue damage after a period of use, which will endanger safe production. [0003] I...

AI Technical Summary

Problems solved by technology

However, due to the large number of members intersected by this type of node, the structure is complex, and it is in a typical multi-axial load and space-complex force state, its fatigue performance determines the safety and durability of the entire bridge. Under loads such as load and wind load, complex welded joints will crack or even break due to multiaxial fatigue damage after a period of use, which will endanger safe production

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