Wind-induced vibration control method for high-pier long-span bridge during construction period

Abstract

The invention discloses a wind-induced vibration control method for a high-pier long-span bridge during a construction period, and relates to the technical field of civil engineering, and the main points of the technical scheme are that the method comprises the following steps: analyzing and obtaining inherent frequency information of a main beam; establishing an original finite element model; establishing a wind-resistant finite element model; carrying out structural dynamic characteristic complex modal analysis; evaluating and analyzing the complex modal dynamic characteristic result from the structure frequency and the modal damping ratio to obtain a first vibration reduction effect; performing evaluating and analyzing according to the buffeting response calculation result to obtain a second damping effect; verifying the test result of the wind-induced vibration response to obtain verification data; and correcting the elastic modulus of the bridge tower and girder concrete of the original finite element model according to the verification data. According to the method, wind-induced vibration control in the construction period of the main beam is carried out by adopting a wind-resistant measure that the vertical lower inhaul cable is matched with the swing type TMD, the wind-induced vibration response and the wind-induced buffeting load in the construction period of the main beam of a bridge structure can be effectively reduced, and the wind-resistant safety in the construction period of a bridge and the comfort of constructors are improved.

Description

technical field [0001] The invention relates to the technical field of civil engineering, more specifically, it relates to a method for controlling wind-induced vibration during the construction period of a high-pier long-span bridge. Background technique [0002] With the further advancement of my country's transportation infrastructure construction, the construction of large-scale bridges across bays and mountainous canyons will gradually become the focus of my country's long-span bridge construction at present and in the future. In the past two decades, my country has built a large number of long-span bridges in mountainous areas, such as Baling River Bridge, Beipan River Bridge, Sidu River Bridge, Aizhai Bridge, Chishi Super Bridge, Kaizhou Lake Super Bridge, Fenglin Super Bridge, etc. . The problem of wind characteristics and wind-induced vibration of the bridge position of high-pier long-span bridges in mountainous areas is more prominent, which is one of the key point...

AI Technical Summary

Problems solved by technology

However, the single down-cable measure and TMD measure have relatively large wind-induced vibration response and wind-induced buffeting load during the construction period of the main girder of the bridge structure, resulting in poor wind-resistant safety and construction personnel comfort during the bridge construction period; in addition, the inclined down-cable In the scheme, the inherent damping of the "swaying main beam" mode of the main beam is relatively low, resulting in a small lateral stiffness of the beam; and the problem of low stiffness of the "overall vertical pendulum" of the main beam

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