曲线梁桥预应力效应的非线性有限元分析

NONLINEAR FINITE ELEMENT ANALYSIS ON CURVED GIRDER BRIDGE OF PRESTRESSED CONCRETE

利用有限元分析程序ANSYS模拟预应力曲线梁桥,考虑几何非线性和材料非线性,讨论了预应力荷载作用下曲线梁桥的应力和位移效应。进行分离式建模:混凝土使用Solid65单元;预应力钢筋为曲线形,使用Link8单元,并通过施加预应变来模拟预应力荷载。在此基础上,分析了预应力钢筋分布和预应力钢筋度对作用效应的影响;并提出了两种解决预应力钢筋扭转效应的措施。

A curved girder bridge of prestressed concrete is analyzed by FEM software ANSYS.Considering geometric and material nonlinearity,stress and displacement behaviors of curved girder bridge are obtained.Separated modeling is adopted:concrete is simulated by Solid65 element;curved prestressed reinforcement bar is simulated by Link8 element,and prestressed load is achieved through the imposition of pre-strain.Furthermore,distributing and number of prestressed reinforcement are discussed and two methods to solve the torsion created by prestressed reinforcement are given.