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以石佛沟特大桥8联3×50 m先简支后结构连续预应力混凝土T梁为研究对象,采取有限元对其进行抗震特性计算。选取墩高较高的3联建立了空间有限元模型,按照两个阶段分别进行了自振特性、反应谱分析和时程分析。计算结果表明:该桥纵向刚度和横向刚度较柔,桥梁振动以纵向和横向振动为主,且第一阶模态为纵向振动;12#墩(过渡墩)墩底截面受力最为不利,可作为全桥抗震设计的控制截面。
Taking the 3 × 50 m 3-T continuous prestressed concrete T-beam with 8 joints in Shifenggou Bridge as the research object, the finite element method was used to calculate the seismic performance. The finite element model of three high pier height was established. According to the two stages, the natural vibration characteristics, response spectrum analysis and time history analysis were carried out respectively. The results show that the longitudinal stiffness and transverse rigidity of the bridge are relatively soft, the vibration of the bridge is mainly vertical and horizontal, and the first mode is the longitudinal vibration. The pier of 12 # pier (transition pier) As a full-bridge seismic design of the control section.