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

A steel truss bridge, fatigue loading technology, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as endangering safe production, complex structure, cracks in welded joints, etc., and achieve the effect of simple operation

Inactive Publication Date: 2017-02-22
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] A fatigue loading device for complex welded joints of a steel truss bridge under multi-axial loads, including three parts: an end-combined bearing frame 1, three hydraulic jacks 2, and a precision force sensor 3;

[0026] Such as figure 1 , Figure 8 The end-combined bearing frame 1 includes four parts: a frame base 11, three frame arms 12, a disc connector 13 and a fixed anchor block 14; the cross-sections of the frame base 11 and the frame arms 12 are two A rectangular frame composed of a "Type 25b" ordinary channel steel and two steel plates, two "Type 25b" ordinary channel steels are arranged in parallel, and the two steel plates are respectively arranged at both ends of the "Type 25b" ordinary channel steel; the steel truss bridge is complex The welded node components are fixed on the frame base through fixed anchor blocks 14, and the ends of the three nodes o...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00
Inventor 项贻强郏亚坤叶肖伟
Owner ZHEJIANG UNIV
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