预应力钢筋混凝土结构三维应力场的实验

Experimental Study on 3D Stress Fields in Prestressed Reinforced Concrete Structures

采用三维光弹性应力二次冻结法模拟分析预应力钢筋混凝土结构中的应力 .为了提高实验速度、增强实验结果的可靠性 ,冻结实验时将预应力和负载应力冻结在同一试件中 .就所涉及相似模拟的若干关键问题 ,结合工程实例进行探讨 ,提供了若干有意义的成果和结论 ,给出切片截面内的最大剪应力等值线分布和边界应力分布 .实验应力分析模拟结果与有限元数值法吻合较好 .因此 。

In this paper,we proposed a way,by which the simulating test study on 3D stress fields in a prestressed reinforced concrete structure was conducted using photoelastic stress twice-freezing method.In order that the experimental speed and reliability by testing results may be increased the frozen stress and loaded stress are frozen in one specimen.Some key problems relating to analog simulation were successfully explored by an example in combination with a practical engineering.Some useful results and conclusions are presented.The distribution of stresses of the maximum shear stress τ max and boundary stress σ s in slice sections are given.The simulated results from experimental stress analyses agree with calculating data of finite-element numerical method very well.The proposed photoelastic stress twice-freezing method is possibly the most powerful method of experimental stress analysis for 3D stress fields in a prestressed reinforced concrete structure.