桥梁抗震及振动分析与测试.pdf

Bridge Earthquake Resistance and Vibration Analysis Bridge local damage and global collapse induced by earthquake, passing vehicle, vehicle collision, and ship collision are generally observed. Transient vibration analysis and vibration resistance design is critical for ensuring life-cycle performance of bridges and structures. Recent research works in BE at Tongji University that address bridge earthquake resistance and vibration analysis include: Seismic isolator design and performance analysis; Dynamic response analysis of deep water bridge piers subjected to earthquake excitation; Double deck bridge behavior analysis under seismic loads; Vibration and noise reduction analysis for rail bridges; Ship-impact analysis of bridges; Seismic performance analysis of hollow rectangular bridge piers. Analysis of the dominant vibration frequencies of rail bridges for structure-borne noise using a power flow method Many field tests and numerical simulations have shown that both the vibration of a bridge and the bridge-borne noise low-frequency dominated. Using the concept of mobility and power-flow analysis in the frequency domain, the aim of this study was to identify the dominant vibration frequencies of a concrete bridge in the frequency range from 20 to 200 Hz by considering the vehicle, track and bridge subsystems as a coupled system. Objective: The use of concrete bridges in urban rail transit systems has raised many concerns regarding low-frequency (20-200 Hz) structure-borne noise due to the vibration of bridges when subjected to moving trains. Understanding the mechanism that determines the dominant frequencies of bridge vibrations is essential for both vibration and noise reduction. Approach: This paper presents a general