Beam bridges are an important component of highway bridges in China.For bridge bearings that have the function of transmitting the force and displacement of the upper structure of the bridge, when they become detached, it will cause changes in the boundary conditions of the beam bridge support, affecting the normal state of the bridge. With the development of modal testing technology and computer technology, the development of dynamic measurement methods has greatly promoted. Constructing dynamic indicators sensitive to void from dynamic parameters and introducing non-contact testing methods have great research value for promoting the detection and positioning of bridge support void. The study used laser Doppler vibration measurement technology to conduct modal testing on indoor beam bridge models under various void conditions, and combined numerical simulation to verify the effectiveness of the vibration mode difference combination index in detecting and positioning bridge bearing void. The results showed that this index can effectively identify the outer bearing void. The research in this article can provide theoretical support for the detection of bridge bearing detachment on site.
关键词
桥梁钢托座/钢托座脱空/激光多普勒测振/动力检测指标
Key words
bridge support/support void/laser doppler vibration measurement/dynamic detection index
维普
万方数据