RESEARCH ON BRIDGE SUPPORT STRIPPING DETECTION BASED ON MODE DIFFERENCE COMBINATION INDEX
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.
bridge supportsupport voidlaser doppler vibration measurementdynamic detection index
万方数据
维普
