预应力混凝土框架结构数值摸拟分析

发布时间：2018-08-31 12:47

【摘要】：由于建筑结构形式的不断多样化,高强度钢材和高强度(高性能)混凝土出现,使预应力混凝土的应用日益广泛。预应力混凝土量能够满足现代建筑不断向大跨度、轻型、高性能方向发展的要求。本文采用midas civil软件建立了预应力混凝土结构模型,进行了理论和数值模拟分析,主要完成了以下几个方面工作：首先,介绍预应力混凝土梁理论知识,主要内容包括：预应力混凝土梁受力特点；预应力混凝土梁预应力损失；预应力混凝土梁正截面承载力计算；预应力混凝土梁反拱度计算。然后,建立后张法有粘结预应力混凝土框架结构有限元模型,在其施加预应力荷载过程中,对其预应力混凝土梁的变形、竖向支撑体系变形进行了详细分析,得出该结构在施加预应力过程中,预应力混凝土梁的起拱值达到了设计要求,有效的控制了大跨度预应力梁的裂缝开展；另外对竖向支撑体系选取结构二层部分柱顶点进行分析,得出了柱顶节点按照施工过程张拉预应力梁时的变形规律。接着对后张法有粘结预应力混凝土框架结构进行抗震分析,先选取预应力梁所在层的梁柱节点,观察其节点位移变化。得出在地震作用下,含预应力梁的相关节点处都较容易发生破坏；又改变预应力梁中预应力值,分析了预应力度对结构整体层位移变化以及含预应力梁的局部一榀框架的影响；最后,建立了有粘结、无粘结预应力混个凝土框架结构有限元模型,对两种结构的整体以及含预应力梁的局部一榀框架进行抗震性能对比分析。得出有粘结预应力混凝土结构的抗震性能比无粘结的好。
[Abstract]:The application of prestressed concrete is becoming more and more extensive due to the diversification of building structure and the appearance of high strength steel and high strength (high performance) concrete. The quantity of prestressed concrete can meet the requirements of the development of modern buildings in the direction of long span, light weight and high performance. In this paper, the model of prestressed concrete structure is established by using midas civil software, and the theoretical and numerical simulation analysis is carried out. The main work is as follows: firstly, the theoretical knowledge of prestressed concrete beam is introduced. The main contents include: prestressing characteristics of prestressed concrete beam, prestressing loss of prestressed concrete beam, calculation of bearing capacity of normal section of prestressed concrete beam and calculation of inverse arch degree of prestressed concrete beam. Then, the finite element model of post-Zhang Fa bonded prestressed concrete frame structure is established, and the deformation of prestressed concrete beam and vertical bracing system are analyzed in detail during the process of prestressing load. It is concluded that the arched value of prestressed concrete beam meets the design requirements in the process of applying prestressing force and effectively controls the crack development of long-span prestressed beam. In addition, the vertical support system is analyzed to select the roof point of the two-story column, and the deformation law of the column top joint is obtained when the prestressed beam is tensioned according to the construction process. Then seismic analysis of post-Zhang Fa prestressed concrete frame structure is carried out. It is concluded that the relative joints of prestressed beams are liable to damage under earthquake, and the prestressing value of prestressed beams is changed, and the influence of prestress degree on the displacement of the whole story of the structure and a local frame with prestressed beams is analyzed. Finally, the finite element model of bonded and unbonded prestressed concrete frame structure is established, and the seismic behavior of the two structures and a local frame with prestressed beam are compared and analyzed. It is concluded that the seismic behavior of bonded prestressed concrete structure is better than that of unbonded prestressed concrete structure.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU378.4

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