单跨3层预压装配式预应力混凝土框架拟动力分析

Pseudo-dynamic analysis of three-story one-span post-tensioned precast prestressed concrete frame

通过一榀单跨3层预压装配式预应力混凝土框架拟动力试验,文章研究了预压装配式框架的动力性能、变形能力及破坏机制。研究表明,预压装配式预应力结构在地震作用下具有很强的变形恢复能力,框架整体刚度未出现明显退化,最大层间位移角满足中震变形要求。在预应力筋的约束下,塑性铰首先出现在梁端,且节点核心区未见细微裂缝,可实现"强柱弱梁"及"强节点"的设计要求。采用结构通用有限元分析软件MI-DAS/Gen,对试验框架进行动力时程分析,求出其位移反应,并与试验结果进行比较,两者吻合较好。

Pseudo-dynamic test was conducted on the three-story one-span post-tensioned precast prestressed concrete model frame. The dynamic capacity, deformation properties and failure mechanism of the frame were investigated. The results of study show that the post-tensioned precast prestressed frame has strong deformation recovery capabilities under the effect of horizontal earthquake, there is no obvious rigidity degradation, and the biggest story drift angle meets the requirements of code for seismic design of buildings. Under the restriction of the prestressed reinforcement, the plastic hinge firstly appears at beam end and there is no slight crack in the core area, the design requirements of ＂strong column and weak beam＂ and ＂strong node＂ can be satisfied. The dynamic time history analysis of the frame is conducted by using the general structural finite element analysis software Midas/ Gen so as to obtain the displacement response. The results are compared with the test ones, indicating that the displacement of the analytical model is close to the results of the test structure.