连续梁桥影响线识别与承载能力快速评估试验研究

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Abstract Aiming at the problems of heavy load standing and traffic obstruction in the process of bridge static load test, a rapid evaluation method of bridge bearing capacity based on influence line is proposed by taking advantage of the bridge influence line to completely reflect the bending stiffness of each section of the structure. In this method, the bridge time history response including bridge influence line information, structural dynamic components and vehicle multiaxial effect is obtained by using the mobile loading of a single heavy vehicle, and the dynamic components in the bridge time history response are first stripped by variational mode decomposition. Secondly, a mathematical model of bridge influence line recognition is constructed according to the sampling frequency and vehicle wheelbase, so as to eliminate the vehicle multi-axis effect in the bridge time history response, and the stable solution of the bridge influence line is obtained by using Tikhonov regularity. Then, by carrying out virtual loading on the bridge influence line, the virtual static response of the bridge is reconstructed, and the traditional check coefficient method is used to evaluate the bearing capacity of the bridge. The effectiveness of the influence line identification method is verified by the numerical example of three-span variable section continuous girder bridge, and the accuracy of the influence line identification result is quantitatively evaluated by establishing the error index, so as to carry out static load test and rapid evaluation test research on the bearing capacity of a three-span continuous steel-concrete composite girder bridge, implement vehicle mobile loading in the preset lane, identify the deflection and strain influence line of the middle span of the bridge, and then the virtual loading study was carried out to further verify the feasibility and practicability of the proposed rapid evaluation method of carrying capacity, and to provide method support and case reference for the "lightweight" rapid screening of bridge carrying capacity.

Key words： continuous girder bridge influence line identification variational mode decomposition bearing capacity rapid evaluation

Received: 08 June 2023 Published: 15 April 2024

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	Articles by authors
	ZHOU Yu1
	2
	3
	SHANG Wenqi1
	2
	DI Shengkui3
	ZHENG Xu4
	HE Wenyu5

Cite this article:

ZHOU Yu1,2,3, et al. Test study on influence line identification and load-bearing capacity rapid evaluation for continuous girder bridge[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(7): 334-344.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I7/334

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