Multi-scale analyzing method for buffeting response of large-span bridge

Abstract

The invention relates to a multi-scale analyzing method for buffeting response of a large-span bridge, which is a method for analyzing and calculating a fine buffeting response of a main girder and solving the difficult problem in bridge buffeting analysis. Comparison between actually measured data of a structure health monitoring system and a calculating result of the buffeting response is realized on a stress level. Based on the traditional buffeting analyzing technique for a large-span bridge structure, a multi-scale finite element modeling technique is introduced into the structure so as to obtain the fine buffeting response of key parts of the structure and then the feasibility and the effectiveness of the analyzing technique for the fine buffeting response are improved. Compared with the traditional method for obtaining the fine buffeting response, the multi-scale analyzing method for the buffeting response of the large-span bridge has the advantages of obviously improving the analyzing efficiency and the accuracy of an analyzing result with the introduction of a multi-scale technique, saving the cost and being convenient for popularization and application in broad engineering personnel. As health monitoring of large-sized bridge structures has become a development trend, the technique can inevitably generate great economic and social benefits.

Description

technical field [0001] The invention relates to a complete set of multi-scale analysis methods for fine buffeting responses of long-span bridges, and is especially suitable for obtaining buffeting responses such as fine internal force, stress and displacement of bridge structures under wind loads. Background technique [0002] Wind disasters have caused huge casualties and economic losses all over the world. Taking the typhoon attack on the east coast of my country as an example, the typhoon "Yunna" in 2004 caused direct economic losses of more than 20 billion yuan. In 2005, typhoons "Matsa", "Teli" and "Kanu" caused direct economic losses of tens of billions of RMB. Super typhoon No. 8 "Sangmei" in 2006, "Sepa", "Weipa" and "Rosa" in 2007, "Seagull", "Phoenix" and "Senlak" in 2008, and the "Morakot", "Fanyabi" and "Catfish" in 2010, etc., the damage caused by the wind is also very alarming. my country has a long coastline, thousands of kilometers of which are directly hi...

AI Technical Summary

Problems solved by technology

However, since the "backbone beam" model is usually used in the wind-induced response analysis of traditional long-span bridges, the analysis results are mainly reflected in the displacement or acceleration response of key sections, and the accurate stress response time history of key parts of the main beam cannot be obtained. , making it difficult to use the measured strain time history data to verify the theoretical results

It is currently unrealistic to carry out fine microscopic modeling and analysis of the overall structure of super-long-span bridges, and it is difficult to determine the boundary conditions when taking out local models for fine simulation

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