预应力混凝土锚固区应力有限元分析

FINITE ELEMENT ANALYSIS OF PRESTRESSED CONCRETE ANCHORAGE ZONE STRESS

本文运用有限元程序对大跨结构锚固区域的受力进行了分析,通过对无横向约束及有横向约束两种情况下结构的仿真分析,得到了在不同情况下结构的应力分布及变形分布情况。由分析结果可知:在没有横向约束情况下,可能产生纵向裂缝;在有横向约束情况下,纵向压应力很快就趋于均匀受力状态,混凝土的横向拉应力很小,基本可以忽略横向劈裂应力。

Using the finite element program,the stress on anchorage area of big span structure is analyzed. And deformation distribution and stress distribution of the structure are got through the simulation analysis under two cases of having transverse constraints or not. By analyzing the results, longitudinal crack may engender without lateral restraint. But vertical compressive stress is soon to balance if there is lateral restraint, and transverse tensile stress of concrete is so feeble that the transverse splitting stress can be negligible basically.