防屈曲支撑在三心圆柱面网壳中的减震控制研究

发布时间：2018-01-16 00:07

本文关键词：防屈曲支撑在三心圆柱面网壳中的减震控制研究　出处：《河北工程大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着近年来大跨度网壳结构的应用日益广泛，其中多为重要公共建筑，一旦发生地震破坏将会造成巨大的生命财产损失，所以提高结构的抗震性能并采取有效的减震措施十分重要。网壳结构由于自身形式的多样性、杆件和节点数目繁多、振型密集复杂等，，减震控制的研究才刚刚起步。防屈曲支撑（BRB）是一类耗能减震元件，在受拉和受压过程中，核心单元因受到约束单元的约束，产生屈服而不屈曲。在强震中BRB能够率先进入耗能状态，消耗输入结构中的地震能量及衰减结构的地震作用，保护主体结构和构件避免遭到破坏，能有效减小网壳的地震响应。采用这种新的抗震设计思路，避免了一些传统设计中存在的问题。本文以某64m跨度的三心圆柱面网壳干煤棚为工程背景，利用SAP2000进行建模，通过模态分析与力学性能分析，得出网壳结构的动力特性与动静力特性。根据结构的动静力特性及防屈曲支撑特点选取了五种防屈曲支撑布置方案，利用非线性时程分析法计算结构的地震作用，计算分析时对结构分别输入了El Centro波、Taft波及唐山波的三向地震作用，对比地震作用下几种不同方案在三种地震波作用下的减震效果，得出了将防屈曲支撑布置在地震作用下内力较大的横向1/4波、3/4波上弦杆件处对结构有较好的减震效果。对将防屈曲支撑布置在横向1/4波、3/4波上弦杆的跨度分别为70m及79m的三心圆柱面网壳进行了减震性能分析，结果表明减震性能良好，为今后大跨度空间网壳结构减震控制研究提供一定的参考。
[Abstract]:With the increasing application of long-span latticed shell structures in recent years, most of them are important public buildings, once earthquake damage will cause huge loss of life and property. Therefore, it is very important to improve the seismic performance of the structure and take effective measures to reduce the earthquake. Because of the diversity of its own forms, the number of members and joints is various, and the vibration modes are dense and complex. The study of damping control is just beginning. Anti-buckling bracing (BRBB) is a kind of energy dissipation element. In the process of tension and compression, the core element is constrained by the constraint element. In strong earthquakes, BRB can take the lead in energy dissipation, consume the seismic energy in the input structure and attenuate the seismic action of the structure, and protect the main structure and components from being destroyed. It can effectively reduce the seismic response of reticulated shells. This new seismic design method can avoid some problems in traditional design. In this paper, a 64m span dry coal shed with a three-center cylindrical reticulated shell is used as the engineering background. The model is modeled by SAP2000, and the modal analysis and mechanical performance analysis are carried out. The dynamic and dynamic characteristics of the latticed shell structure are obtained. According to the dynamic and dynamic characteristics of the structure and the characteristics of anti-buckling bracing, five kinds of anti-buckling bracing arrangements are selected. The nonlinear time-history analysis method is used to calculate the seismic action of the structure, and the three-dimensional seismic action of the El Centro wave and Tangshan wave is input into the structure respectively. By comparing the damping effect of several different schemes under the action of three kinds of seismic waves, the transverse 1/4 wave with large internal force is obtained by arranging the buckling bracing under earthquake action. The upper chord member of 3/4 wave has better damping effect on the structure, and the anti-buckling bracing is arranged in the transverse 1/4 wave. The vibration absorption performance of three-core cylindrical reticulated shell with span of 70m and 79m on 3/4 wave is analyzed. The results show that the damping performance is good. It provides a certain reference for the future research on the damping control of large span space reticulated shell structures.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU399;TU352.1

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