某波形钢腹板组合箱梁桥的抗震性能研究

Study on Aseismic Design of a Corrugated Steel Web Composite Box Girder Bridge

为了探究波形钢腹板组合箱梁桥的抗震性能,为类似工程的抗震设计提供技术支持,以某组合梁桥为例,首先介绍了时程分析方法的理论,然后利用Midas Civil有限元软件,对该组合梁桥在不同方向地震波影响下的位移和内力情况进行了数值模拟研究。成果表明:Nemark法的实质是对线性加速度法的修正和改进,该方法对结构力学模型进行了合理的简化,在基于有限元的桥梁结构抗震性能分析中能得到良好的应用效果;水平向地震波对波形钢腹板组合箱梁的影响最大,以桥墩墩底和中跨跨中位置的影响最为严重。

In order to explore the seismic performance of the composite box girder bridge with corrugated steel webs and provide technical support for the seismic design of similar projects.Taking a composite girder bridge as an example,the basic theory of time history analysis method is introduced firstly,and then the displacement and internal force of the composite girder bridge under the influence of different directions of seismic waves are studied by numerical simulation with the aid of MIDAS civil finite element software.The results show that the essence of the nemark method is to modify and improve the linear acceleration method,which simplifies the structural mechanical model reasonably,and has a good application effect in the seismic performance analysis of bridge structures based on the finite element method;The horizontal seismic wave has the greatest influence on the composite box girder with corrugated steel webs,especially on the bottom of pier and the middle span.