RPC简支T形梁自振特性分析

Study on Characters of Self-vibration for Simple-supported RPC T-beams

活性粉末混凝土材料(简称RPC)应用于铁路桥梁,会使结构的自振频率发生明显改变,影响桥梁在列车荷载作用下的动力响应。采用有限元方法对一座RPC简支T型梁的自振特性进行模拟计算,并分析了RPC桥梁的振型特征以及影响其纵向、横向和扭转刚度的主要因素。经过对比说明此RPC桥梁的自振特性参数能够反映结构的实际状况,为进一步的车桥动力分析提供可靠数据。

The railway bridge, which is made of reactive powder concrete （RPC）, will have an obvious change in its frequency of self-vibration and dynamic response under train loads. In this paper, the self-vibration characters of a simple-supported RPC T-beams are calculated with finite element method. Model features and influencing factors of rigidity are also taken into account. Comparison results show that these vibration parameters, which reflect the real conditions of RPC bridge, can provide credible data for the subsequent vehicle ＆ bridge dynamic analysis.