Abstract
As a simply-supported T beam of the girder grid system, the damage of the bridge deck will inevitably change the overall stiffness of the bridge, and then affect the natural dynamic characteristics of the bridge. The variation of the first-order natural frequency of the bridge before and after the damage of the T beam flange was analyzed by using the finite element analysis method, and the influence law of the T beam flange damage on the natural frequency of the simply supported T beam bridge was obtained. The analysis results showed that the damage of T beam flange will bring about a significant change in the first-order natural frequency. Taking the natural frequency test of multi-span simply supported beams in practical engineering as an example, the first order natural frequency of the undamaged span and the damaged span of the bridge deck were tested respectively, and the influence of the damage on the first order natural frequency was analyzed. Results showed that the first order natural frequency decreases by 15.63 % under the condition that the single T beam is completely damaged in the mid-span position. Therefore, the damage of T bridge can be preliminarily judged by the change of the natural frequency of simply supported beam bridge in practical engineering.
Highlights
With the extension of operation time, the service performance of the bridge will decline in the actual operation process, resulting in different degrees of disease [1]
Taking the reinforced concrete supported T beam bridge as the object, this paper studied and analyzes the influence of T beam flange damage on the natural frequency of the bridge
The change of the first order natural frequency of the supported T beam bridge before and after the damage of the bridge deck were analyzed with finite element analysis method, and the influence law of the damage of the T beam flange on the natural frequency of the supported T beam bridge was obtained
Summary
With the extension of operation time, the service performance of the bridge will decline in the actual operation process, resulting in different degrees of disease [1]. T beam flange is the most vulnerable position under the reciprocating action of heavy vehicle, especially near the middle span of bridge deck center line. This kind of damage will inevitably cause the change of the dynamic and static characteristics of the bridge [4, 5]. ANALYSIS OF INFLUENCE OF BRIDGE DECK DAMAGE ON FIRST ORDER NATURAL FREQUENCY OF SUPPORTED T-BEAM BRIDGE. The effects of deck damage on the first order natural frequencies of supported T bridges were analyzed by theoretical and experimental methods. Finite element analysis of the effect of flange breakage on first order natural frequency
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