PC连续槽形梁的力学性能研究

根据实体退化单元,建立PC连续槽形梁的分析模型,对其力学响应进行了研究。基于实体退化单元模式,推导了实体退化单元的位移场表达式,并得到了相应的内力表达式,同时基于四参数屈服准则、Hinton压碎准则等考虑了混凝土的材料非线性。通过PC连续槽形梁实例分析,结果表明,实体退化单元能有效地模拟PC连续槽形梁,随着加载量增大,预应力钢筋应力增长迅速但未屈服。研究结论可供工程设计参考。

ANALYSIS OF MECHANICAL PERFORMANCES OF CONTINUOUS U SHAPED BEAM

Based on degraded solid element method,the mechanical behavior of pre-stressed concrete U beam was studied.The analytic model of degraded solid element was set up and the expressions of coordinates and displacement fields are derived.Then the internal force expressions of normal force,bending moment,torque and shear force are obtained.At the same time,the material nonlinearity of concrete is considered based on the four parameter yield criterion.Through the example analysis of prestressed concrete U shaped beam,it is shown that the pre-stressed concrete U shaped beam can be efficiently modeled by the degraded solid element.With the increase of the load,the stress of the prestressed steel bar increases rapidly but it is less than the yield of the steel.The research conclusions can be referred to the engineering design.