Horizontal low-cycle repeated test device for bracket nodes

Abstract

The invention discloses a horizontal low-cycle repeated test device for bracket system nodes, and belongs to the field of horizontal load stress performance test equipment for bracket system components. The device comprises a test bed, a bracket bracket, a portal frame and a horizontal actuator. The test bed is composed of a base, side columns and an upper beam. A one-way hinge with a steel plate is arranged at the tail of the horizontal actuator and connected to a test bed side column through a bolt, a fixed pulley is arranged on the bottom face of the upper beam, and a rope connects the head of the horizontal actuator with a balance weight through the fixed pulley to keep an initial balance state. The test device can simulate the low-cycle repeated stress condition of the bracket member under the action of horizontal loads such as earthquake load, wind load and the like by applying horizontal repeated load to the column head square column of the bracket test piece. In the loading process, the head of the horizontal actuator can move up and down along with rotation of the bracket, extra constraint of bracket nodes is avoided, the device is simple and convenient to disassemble, stress of the bracket nodes fits reality, and the device has the advantages of being cost-saving, simple, convenient and fast.

Description

technical field [0001] The invention relates to the technical field of fatigue testing equipment for bucket arch joints, in particular to a horizontal low-cycle repeated test device for bucket arch joints. Background technique [0002] Dougong is the quintessence of Chinese and even East Asian countries' wooden architectural heritage. It not only has exquisite decorative effect, but also plays an important role in the transmission of structural force. The bucket arch joints in the wooden structure of ancient buildings have significant semi-rigid characteristics, and have good resistance and energy dissipation for horizontal loads such as wind vibration or earthquake. The key to overall seismic performance. Dougong joints tend to be damaged prior to beams and columns in earthquakes. Therefore, it is of great significance to carry out mechanical performance tests on dougong joints under low-cycle repeated loads, which is of great significance for the evaluation of seismic and...

AI Technical Summary

Problems solved by technology

However, the horizontal actuator often has a large self-weight, which is easy to cause additional constraints at the loading point. Simultaneously loading a single lower flat truss member is not conducive to the real simulation of horizontal loads such as earthquakes and the application of stable and effective horizontal loads to the overall bucket arch nodes.

On the other hand, using vertical hydraulic jacks to apply axial pressure, the installation process is more cumbersome and costly

Therefore, when using the current bucket arch node horizontal low-cycle repeated test device for testing, there are defects such as complicated disassembly and assembly, unstable loading, and joint forces that do not conform to the real structure, which greatly limits the research and development of the low-cycle repeated action of the bucket arch node. It is not conducive to the great progress of the protection technology of ancient wooden structures, and it is also not conducive to revealing and inheriting the scientific mechanism of China's excellent traditional architectural culture

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