往复荷载下预应力混凝土结构的数值模拟

现阶段,预应力技术得到广泛应用,深入研究预应力混凝土结构或构件的抗震性能有着重要的工程意义。在往复荷载下,预应力混凝土结构或构件的材料和力学行为复杂,需要借助数值模型加以准确模拟。本文基于杆件结构纤维模型程序,编制了预应力混凝土杆系结构及构件的数值分析模型。利用该模型,本文对往复荷载下的一榀有粘结预应力混凝土框架试件和一榀无粘结预应力混凝土框架试件,以及一根无粘结预应力混凝土柱试件进行了数值模拟。计算结果与试验结果的对比表明,由于采用了合理而准确的材料滞回模型并合理考虑了预应力的影响,本文开发的杆系有限元数值分析模型能够准确预测往复荷载下预应力混凝土杆系结构或构件的滞回特性,可以用于预应力混凝土实际结构的计算分析及其受力机理的探讨。

Numerical Simulation for the Hysteresis Behavior of Prestressed Conrete Structures under Cyclic Loads

Due to progressively using in practical construction of prestressed concrete structures,the researches for seismatic performance of prestressed concrete(PC) structures has remarkable significance in engineering practice.Because of the complicated behavior of material and loads,the precise simulation of PC structures or members under cyclic loads has to depend on numerical model.In this paper, a numerical analysis model for the simulation of PC member structures is developed on the basis of a fiber model program.A PC frame,an unbonded PC frame and an unbonded PC column under cyclic loads are simulated with the developed program.The comparison of the results between simulations and tests indicates that,for the reason of using rational hysteretic material model and exactly considering the influence of prestressing,the numerical analysis model based on fiber models developed in this study can accurately predict the hysteretic properties of PC structures and can be used in the parametric analysis and mechanism study.