纵向预应力加固混凝土偏压柱破坏过程的数值仿真分析

Numerical simulation of reinforced concrete eccentric columns strengthened by longitudinal prestressed steel strands

为了研究以纵向预应力张拉加固钢筋混凝土偏心受压构件效果及影响因素,开展了加固后偏压柱破坏过程的数值仿真分析研究。利用ANSYS有限元计算软件,模拟了不同偏心距和加固方式下偏压柱构件加载破坏全过程,探讨了纵向预应力钢绞线加固方式、外荷载偏心距以及钢绞线初张拉力值等因素对偏压柱承载能力、刚度和破坏时塑性性能的影响。研究表明,预应力加固能有效提高偏心受压柱的极限承载能力和抗弯刚度,破坏状态构件截面内塑性发展更加充分,属性破坏的变形特点更加明显;而且,当偏心距较大时,单侧预应力张拉的加固效果更加明显。

In order to study the effect and influence factors of eccentrically compressed reinforced concrete members with longitudinal prestressed tension,the numerical simulation analysis of the failure process of the eccentrically compressed column was carried out.Utilizing ANSYS finite element software,the whole process of loading failure of eccentrically compressed columns under different eccentricity and reinforcement modes was simulated.The influence of longitudinal prestressed steel strand reinforcement mode,eccentricity of external load and initial tension force value of steel strands on the carrying capacity,stiffness and plastic performance of eccentrically compressed column were discussed.The results show that the prestressed reinforcement can effectively improve the ultimate carrying capacity and bending stiffness of the eccentric compression column,and the plastic development of the failure state member section is more complete,and the deformation characteristics of the attribute failure are more obvious.Moreover,when the eccentricity is larger,the reinforcement effect of unilateral prestressed tensioning is more obvious.