无梁楼盖地下车库受火灾影响的有限元分析

发布时间：2018-04-17 04:36

本文选题：无梁楼盖 + 有限元分析　；参考：《沈阳建筑大学》2015年硕士论文

【摘要】：无梁楼盖结构体系因其只有柱子和楼板,可以有效节省房间的净高尺寸,在当今的房建工程中应用较多,特别是一些高层建筑的地下车库,然而随着国内车辆的持续增长,汽车因油路、线路老化等原因引发的汽车自燃事件逐年上升,持续高温会使钢筋混凝土结构的力学性能下降,进而导致结构的承载力降低,影响整体结构的安全稳定性能,因此对钢筋混凝土无梁楼盖结构体系的耐火性能分析成为当下的一个重点关注工作。本文以钢筋混凝土无梁楼盖结构的地下车库为实例,应用有限元ANSYS软件对该结构体系进行热-结构耦合分析,通过数值模拟,得出结构体系的位移与应力变化情况,从而对该体系的耐火性能进行评判。本文主要进行了以下工作：1.根据相关文献,熟悉并掌握有限元ANSYS热分析理论,明确热传导的方式及相应的适用条件,为后期应用有限元ANSYS软件对无梁楼盖结构体系进行热分析数值模拟奠定基础。2.通过有限元ANSYS软件对常温下无梁楼盖结构体系进行数值模拟,得出该结构体系的位移与应力分布情况,准确判断出该结构体系的薄弱部位,有针对性的分析该结构体系的变形及承载能力。3.因温度提升后钢筋混凝土的热工和力学性能逐渐降低,通过有限元ANSYS软件对火灾下无梁楼盖结构体系进行数值模拟,利用国际标准升温曲线先得出该结构体系的温度场,再通过热-结构耦合分析得出其位移与应力分布情况,根据相关文献,评判该结构体系的耐火性能。以上工作希望可以为当今房建工程无梁楼盖结构体系的应用提供一些参考,并且希望为钢筋混凝土结构耐火性能提供一部分的参考依据。
[Abstract]:Because the beamless floor structure system has only the columns and floors, it can save the net high size of the room effectively, and it is widely used in the current housing construction projects, especially the underground garage of some high-rise buildings. However, with the continuous growth of domestic vehicles,The auto spontaneous combustion events caused by oil route and line aging increase year by year, and the mechanical properties of reinforced concrete structure will be decreased because of the continuous high temperature, which will lead to the decrease of the bearing capacity of the structure, which will affect the safety and stability of the whole structure.Therefore, the fire resistance analysis of reinforced concrete without beam floor structure system has become a focus of attention.Taking the underground garage of reinforced concrete floor structure as an example, the thermal-structural coupling analysis of the structure system is carried out by using finite element ANSYS software. Through numerical simulation, the displacement and stress changes of the structure system are obtained.Thus, the fire resistance of the system is evaluated.This article mainly carries on the following work: 1.According to the relevant literature, we are familiar with and master the finite element ANSYS thermal analysis theory, clarify the heat conduction mode and the corresponding applicable conditions, and lay a foundation for the numerical simulation of the non-beamless floor structure system by using the finite element ANSYS software in the later period.The finite element ANSYS software is used to numerically simulate the structure system with no beam floor at room temperature. The displacement and stress distribution of the structure system is obtained, and the weak position of the structure system is accurately judged.The deformation and bearing capacity of the structure system are analyzed.Because the thermal and mechanical properties of reinforced concrete decrease gradually after the temperature rise, the temperature field of the structure system is obtained by using the international standard heating curve, and the numerical simulation of the structure system is carried out by finite element ANSYS software.The distribution of displacement and stress is obtained by thermal-structural coupling analysis, and the fire resistance of the structure system is evaluated according to the relevant literature.It is hoped that the above work can provide some references for the application of the non-beamless floor structure system in present housing construction projects, and also provide some reference basis for the fire resistance of reinforced concrete structures.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU93;TU998.1

【相似文献】