荷载历程对预应力梁的耗能及破坏特征的影响

对预应力混凝土梁在不同荷载历程下的滞回特性进行了分析研究。在预应力混凝土梁的拟静力试验中,采用了四种加载方案模拟不同的地震作用,获得了荷载历程对构件的耗能特性以及破坏特征的影响。研究表明:荷载历程中的最大位移,是影响预应力构件耗能特性的重要因素;最大位移出现的越早,对构件在随后中、小位移处的刚度影响越大,且构件的总耗能能力损失也越多。

THE INFLUENCE OF LOAD HISTORIES TO CHARACTERISTIC OF ENERGY DISSIPATION AND FAILURE OF PRESTRESSED CONCRETE BEAMS

This article investigates and analyses the hysteretic characteristic of the prestressed concrete beams under different load histories. In the quasi-static test on prestressed concrete beams, four types of loading schemes were selected to simulate different earthquake actions. The influence of load histories on energy dissipation characteristic and failure feature of the members were acquired. The study indicated that the maximum displacement in the load histories is an important influence factor to energy dissipation characteristic of members. The sooner the maximum displacement experiences, the larger influence on the stiffness of member under the succeeding middling or small displacements, and the more loss to total energy dissipation capacity of the member.