预应力装配式建筑结构抗震分析方法研究

发布时间：2018-04-11 23:10

本文选题：预应力装配式 + 残余变形　；参考：《大连理工大学》2015年硕士论文

【摘要】：建造工业化与抗灾可恢复是结构工程发展的目标与趋势。预应力装配式设计与施工是实现这个目标的有效途径。目前,国内外针对预应力装配式结构的研究主要集中在构件层面,鲜见针对结构体系抗震性能的研究。本文以预应力装配节点为研究对象,在节点中部采用无粘结高强预应力筋,上下位置布置耗能钢筋,用以平衡结构损伤控制与耗能能力之间关系。本文聚焦该形式的预应力装配式结构的整体抗震性能,据此开展以下工作：(1)首先,总结提出了预应力装配节点的建模方法。基于OpenSEES平台,采用Truss单元对预应力筋建模；为模拟梁柱界面开裂行为,将交界面梁端区域设置为只承压的区域,并确定了该区域长度的合理取值范围；通过与试验模型的滞回曲线进行对比,验证了本文提出的节点建模方法的可靠性。(2)其次,探索提出了预应力装配式结构的设计原则。为对比预应力装配式结构与现浇结构的抗震性能,本文提出了梁柱截面具有相同截面尺寸及极限弯矩的原则,给出了不同预应力度下的预应力钢筋与耗能钢筋面积的计算方法。并依据我国现行规范按VIII度烈度设防,分别设计了一榀四层现浇混凝土框架和预应力装配式框架。(3)最后,通过非线性分析对比研究了预应力装配框架与现浇框架的抗震性能以及耗能钢筋配筋率的影响。通过Pushover分析对比了等同截面抗弯性能的两种结构的顶点位移与基地剪力关系曲线,研究表明在较小变形下,两者的曲线基本重合,随着顶点位移增加,预应力装配式结构的抗力低于现浇结构。通过非线性时程分析发现,相同截面极限弯矩的两种结构,大震下结构最大响应基本相同,但预应力装配式结构的残余变形远小于现浇结构,增加耗能钢筋面积对预应力装配式结构的性能影响不大。总之,通过对比研究表明预应力装配式结构的整体抗震性能与现浇结构基本相同,但残余变形远远小于现浇结构,可实现灾后功能的快速恢复。
[Abstract]:Construction industrialization and disaster resilience are the goal and trend of structural engineering development.Prestressing assembly design and construction is an effective way to achieve this goal.At present, the research on prestressing prefabricated structures is mainly focused on the member level, and rarely on the seismic performance of structural systems.In this paper, the prestressing assembly joints are studied, the unbonded high strength prestressed tendons are used in the middle of the joints, and the energy dissipation bars are arranged in the upper and lower positions to balance the relationship between the damage control and the energy dissipation capacity of the structures.This paper focuses on the overall seismic behavior of the prestressing prestressing assembly structure. According to the following work: 1) firstly, the modeling method of the prestressing assembly joint is summarized.Based on the OpenSEES platform, the prestressed tendons are modeled by Truss element, and in order to simulate the interface cracking behavior of Liang Zhu, the end region of the interface beam is set to the region with only bearing pressure, and the reasonable range of the length of the zone is determined.Comparing with the hysteretic curve of the test model, the reliability of the proposed method is verified. Secondly, the design principle of prestressing prefabricated structure is discussed.In order to compare the seismic behavior of prestressing prefabricated structure and cast-in-place structure, the principle that Liang Zhu section has the same cross section size and ultimate bending moment is put forward in this paper, and the calculation method of the area of prestressed steel bar and energy-consuming steel bar under different prestressing degree is given.According to the current code of our country, according to the intensity of VIII, a four-story cast-in-place concrete frame and a pre-stressed prefabricated frame are designed respectively.Through nonlinear analysis, the effects of seismic behavior of prestressed assembly frame and cast-in-place frame on reinforcement ratio of energy dissipation bar are compared and studied.Through Pushover analysis, the curves of the relationship between the vertex displacement and the static shear force of two kinds of structures with the same cross-section flexural performance are compared. The results show that the curves of the two structures basically coincide with each other when the deformation is small, and with the increase of the vertex displacement,The resistance of prestressing prefabricated structure is lower than that of cast-in-place structure.Through nonlinear time history analysis, it is found that the maximum response of two structures with the same ultimate moment of cross section is basically the same, but the residual deformation of prestressing prefabricated structure is much smaller than that of cast-in-place structure.Increasing the area of energy dissipation steel bar has little effect on the performance of prestressing assembly structure.In a word, the comparative study shows that the seismic behavior of prestressing prefabricated structure is basically the same as that of cast-in-place structure, but the residual deformation is much smaller than that of cast-in-place structure, which can realize the rapid recovery of post-disaster function.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.11

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