大跨钢拱薄壳穹顶结构地震响应分析

发布时间：2018-01-24 14:49

本文关键词： 钢拱薄壳穹顶有限单元法地震响应分析行波法时程分析法　出处：《沈阳建筑大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着公共建筑、交通建筑以及大型工业建筑对大跨空间结构需求量的逐渐增加,各类大跨空间结构得到了广泛的应用。大跨空间结构具有形体合理、受力性能良好以及经济美观等优点,是目前发展较快建筑形式之一。大跨空间结构在不断的创新和发展中采用了大量新工艺、新技术以及新材料,使大跨空间结构更加便于施工建造和具有更强的实用性。钢拱薄壳穹顶结构越来越多的被应用在城市的建筑结构当中。对于大量复杂、新型的大跨屋盖的出现,以及所表现出来的各种力学特征和安全稳定性,受到了众多科技和设计人员关注。论文以某建筑公司的工程实例大跨钢拱薄壳穹顶为研究基础,主要分析大跨钢拱薄壳穹顶结构在地震作用下的动力特性。首先介绍了地震响应分析的主要方法,大跨屋盖结构的地震响应分析方法包括振型分解反应谱法时程分析法和随机振动法。然后采用振型分解反应谱法和时程分析法两种方法对结构进行研究分析。本文根据有限单元法利用大型有限元分析软件ANSYS对大跨钢拱薄壳穹顶进行模拟分析,将地震谱和地震波分别施加到结构上,通过软件计算得出结构在结构在地震作用下的节点位移,确定了结构在地震作用下的安全性。同时,为了进一步研究大跨钢拱薄壳穹顶的动力特征,考虑了不同参数对结构动力性能的影响。大跨钢拱薄壳穹顶随着加劲肋数量和薄壳厚度的改变时,在地震作用下的响应位移也会随之变化。归纳得出一定的变化规律,为穹顶结构的抗震设计提供参考。而且,为保证结构的安全性,分别选取天津波、EL-centro和TFAT三种典型的地震波进行了多维地震响应分析,应用时程分析法计算结构的节点位移。本文进一步研究了大跨屋盖结构在行波作用下的地震反应,相比较于一致激励,多点激励对钢拱薄壳穹顶的影响较大,但由于结构的跨度仅为40米,行波作用表现不明显,进一步证明大跨钢拱薄壳穹顶在地震作用下是安全的,不会发生大面积破坏。
[Abstract]:With the increasing demand for large span space structure in public buildings, traffic buildings and large industrial buildings, all kinds of large span space structures have been widely used. Long span space structures have reasonable shape. The advantages of good mechanical performance and economic beauty are one of the forms of rapid development at present. A large number of new technologies new technologies and new materials have been adopted in the continuous innovation and development of long-span space structures. The large span space structure is more convenient for construction and has stronger practicability. The steel arch thin shell dome structure is more and more used in the urban building structure. For a large number of complex, the emergence of a new type of large span roof. All kinds of mechanical characteristics and safety and stability are concerned by many scientists and designers. This paper is based on the large span steel arch thin shell dome of a construction company. The dynamic characteristics of long-span steel arch domes under earthquake are analyzed. Firstly, the main methods of seismic response analysis are introduced. The seismic response analysis methods of long-span roof structures include mode decomposition response spectrum method and random vibration method, and then the vibration mode decomposition response spectrum method and time-history analysis method are used to study and analyze the structure. Based on finite element method (FEM), a large scale finite element analysis software ANSYS is used to simulate and analyze the large span steel arch thin shell dome. The seismic spectrum and seismic wave are applied to the structure separately. The node displacement of the structure under earthquake is calculated by software, and the safety of the structure under earthquake is determined. At the same time, in order to further study the dynamic characteristics of large-span steel arch and thin shell dome. The influence of different parameters on the dynamic performance of the structure is considered. When the dome of long span steel arch is changed with the number of stiffened ribs and the thickness of thin shell. The response displacement will also change under the earthquake. A certain law of change is concluded to provide a reference for the seismic design of the dome structure. Moreover, in order to ensure the safety of the structure, the Tianjin wave is selected separately. Three typical seismic waves, EL-centro and TFAT, are used to analyze the multi-dimensional seismic response, and the nodal displacement of the structure is calculated by time-history analysis. In this paper, the seismic response of long-span roof structure under traveling wave is further studied. Compared with uniform excitation, multi-point excitation has a great influence on the steel arch thin shell dome, but the span of the structure is only 40 meters. The action of traveling wave is not obvious which further proves that the dome with long span steel arch and thin shell is safe under earthquake action and will not be destroyed in large area.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU311.3

【参考文献】