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工程力学  2014 

近场竖向地震激励下桥梁支座对竖向碰撞的影响

DOI: doi:10.6052/j.issn.1000-4750.2012.12.1020, PP. 183-189

Keywords: 近场竖向地震,连续梁桥,支座刚度,碰撞,响应

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Abstract:

考虑桥梁支座的作用,针对两跨连续梁桥的竖向碰撞问题,建立了梁-弹簧-杆连续体模型.采用瞬态波特征函数展开法和组合体瞬态内力法,推导了多次竖向碰撞问题的理论解,分析了桥梁支座对竖向碰撞的影响.研究结果表明:桥梁支座直接影响桥面与桥墩的局部碰撞接触刚度,显著影响竖向碰撞响应,包括碰撞次数、竖向碰撞力和碰撞位移响应等.桥梁支座对竖向碰撞具有显著的吸能减震效果,且影响竖向碰撞响应的基本特征,如次碰撞出现的频次和响应的频率.当近场竖向地震激励周期逼近桥梁的固有振动周期时,桥面上抛跳起,与桥梁支座产生剧烈竖向碰撞.由于调节桥梁支座的刚度可以改变桥梁的固有振动周期,因此,合理设计桥梁支座对于降低竖向碰撞的破坏作用,提高桥梁结构抵抗竖向地震的能力,具有重要的价值.

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