高烈度地震区铁路桥梁新型耗能防落梁装置研究

Research on new energy dissipation anti-drop-beam device for railway bridge in high seismic intensity area

摘要:

为了解决目前铁路桥梁传统防落梁装置的不足,研发了适用于高烈度地震区铁路桥梁新型波纹钢耗能防落梁装置。推导建立了波纹钢耗能防落梁装置的力学性能计算公式,提出了铁路桥梁用耗能防落梁装置简化设计方法,并开发了装置的设计分析软件,开展了耗能防落梁装置力学性能试验研究,以渝昆高铁8度地震区某典型大跨连续梁为研究对象,设计了大桥的耗能防落梁装置,并开展了装置对大桥抗震性能分析。结果表明:建立的耗能防落梁装置力学参数计算理论和设计方法正确,适应工程实际应用的要求,耗能防落梁装置滞回曲线饱满,耗能能力较强,低周疲劳性能良好。设计的耗能防落梁装置可以满足高速铁路大跨桥梁抗震性能要求,具有良好的减震、耗能和缓冲作用,可降低大跨连续梁桥梁端位移约25%。

Abstract:

In view of the limitation of the traditional anti-drop-beam devices of railway bridges, a new corrugated steel energy dissipation anti-drop-beam device was developed for railway bridges in high earthquake intensity areas. The formula for calculating the mechanical properties of corrugated steel energy dissipation anti-drop-beam device was deduced and established. A simplified design method of energy dissipation anti-drop-beam device for railway bridges was proposed, and the design and analysis software of the device was developed. The mechanical performance test of the energy dissipation anti-drop-beam device was carried out. Taking a typical long-span continuous beam in an eight-degree earthquake intensity region of Chongqing-Kunming high-speed railway as the research object, the energy dissipation anti-drop-beam device of the bridge was designed, and the impact of the device on the seismic performance of the bridge was analyzed. Results show that the design method and mechanical parameter calculation theory of the new energy dissipation anti-drop-beam device had strong adaptability and high calculation precision, which met the accuracy requirement of engineering applications. The hysteretic curve of the anti-drop-beam device was full, the energy dissipation ability was enhanced, and the low cycle fatigue performance was good. The designed energy dissipation anti-drop-beam device could meet the seismic performance requirements of high-speed railway long-span bridges, with good effect of shock absorption and energy dissipation, which could reduce the end displacement of long-span continuous girder bridge by about 25%.