加筋泡沫轻质混凝土路桥过渡段动力特性研究

为研究加筋泡沫轻质混凝土的力学性能及其用于路桥过渡段的动力特性，首先开展了加筋泡沫轻质混凝土抗压强度和弹性模量试验，其次运用ABAQUS建立了轨道-路基-过渡段三维数值模型，分析了加筋泡沫轻质混凝土过渡段的动力特性。结果表明:加筋泡沫轻质混凝土无侧限抗压强度和弹性模量随着纤维含量增加呈现先增加后减小趋势，密度大于700 kg/m3的加筋泡沫轻质混凝土可满足高速铁路路桥过渡段的填料性能要求；采用加筋泡沫轻质混凝土填筑过渡段时能够减少结构的振动，随着过渡段加筋泡沫轻质混凝土填料密度的提高

Study on Dynamic Characteristics of Reinforced Foam Lightweight Concrete Bridge Transition Section

To evaluate the mechanical properties and the dynamic characteristics of the reinforced foam lightweight concrete bridge transition sections, the compression strength and elastic modulus test was carried out and the finite element software ABAQUS was used to establish the three-dimensional model of the track-subgrade-transition section, analyzing the dynamic characteristics of the reinforced foam lightweight concrete bridge transition sections. The results showed that the unconfined compressive strength and elastic modulus increase at first then decrease with the increase of fiber content. When the density is greater than 700 kg/m3, the reinforced foamed lightweight concrete can meet the performance requirements of the filler of the bridge transition section. Filling the transition section using the reinforced foam lightweight concrete can reduce the vibration of the structure and the dynamic response of transition section gradually decreases with the increase of the density of filler.