拉链柱式中心支撑钢框架基本构件抗震设计方法研究

发布时间：2018-06-08 21:51

  本文选题：拉链柱式中心支撑钢框架 + 拉链柱　； 参考：《河北科技大学》2014年硕士论文

【摘要】：拉链柱式中心支撑钢框架结构是基于传统的人字形中心支撑钢框架结构基础上发展起来的一种新型结构体系,拉链柱即是连接每个支撑与被撑梁交点的竖向受力构件。目前,国内外有关此类体系抗震性能的研究还较少,我国规范亦没有给出有针对性的设计条文。本文在总结国内外相关研究现状的基础上,对拉链柱式中心支撑钢框架结构基本构件(包括拉链柱、支撑跨柱、支撑、被撑梁)的抗震设计方法进行了研究,具体如下:1)参照悬挂拉链柱式中心支撑钢框架结构的设计方法,设计了两组对比算例,其中支撑分别按考虑与不考虑受循环荷载时的强度降低系数设计。对算例的自振特性、用钢量、多遇及罕遇地震下的动力响应等指标进行了分析比较,综合考虑用钢量、结构动力响应等指标后,建议支撑设计时不考虑受循环荷载时的强度降低系数。2)提出了基于SRSS内力组合原则的拉链柱式中心支撑钢框架结构中拉链柱、支撑跨柱的设计建议,考虑被撑梁可以承受一定的竖向力。对比了按本文建议设计的拉链柱式中心支撑钢框架结构与悬挂拉链柱式中心支撑钢框架结构的自振特性、用钢量、多遇及罕遇地震下的动力响应等指标。综合考虑用钢量、结构动力响应等指标后,建议拉链柱、支撑跨柱、被撑梁按本文建议设计。3)依据基于循环次数的钢支撑低周疲劳寿命估算方法,对按本文建议设计的以及悬挂拉链柱式中心支撑钢框架结构在罕遇地震下支撑的低周疲劳性能进行了评估,结果表明两组算例各层支撑的疲劳损伤程度均很小,正常情况下支撑很难发生低周疲劳破坏,进一步确定了支撑设计时可以不考虑受循环荷载时的强度降低系数。
[Abstract]:The zipper center-braced steel frame structure is a new type of structural system developed on the basis of traditional herringbone center-braced steel frame structure. Zipper column is a vertical force member connecting each braced beam and the intersection point of each braced beam. At present, there are few researches on seismic performance of this kind of systems at home and abroad, and there are no specific design provisions in our code. On the basis of summarizing the research status at home and abroad, this paper studies the seismic design methods of the basic components of the zipper column center-braced steel frame structure (including zipper column, bracing, braced beam). The following is as follows: 1) according to the design method of the steel frame structure with hanging zipper column type center bracing, two sets of comparative examples are designed, in which the strength reduction factor of the bracing is designed according to the strength reduction factor when the cyclic load is taken into account and not taken into account, respectively. This paper analyzes and compares the natural vibration characteristics of an example, the dynamic response of the steel quantity, the frequent occurrence and the rare earthquake, and synthetically considers the steel quantity, the dynamic response of the structure, and so on. It is suggested that the strength reduction factor of braces should not be taken into account in the design of braces under cyclic loading. (2) the design proposal of zipper columns and bracing columns in steel frame structures with central bracing based on the principle of SRSS internal force combination is put forward. Considering the bearing beam can bear a certain vertical force. This paper compares the natural vibration characteristics of the steel frame structure with the zipper column type center braced steel frame structure and the suspended zipper column type steel frame structure, and compares the dynamic response of the steel frame structure with steel quantity, frequent occurrence and rare earthquake, and so on. After considering the steel quantity and the dynamic response of the structure, it is suggested that the zipper column, the braced column and the braced beam should be designed according to the suggestion of this paper. 3) based on the method of estimating the low cycle fatigue life of steel bracing based on the cycle number, The low cycle fatigue behavior of the steel frame structure with suspended zipper column type center braced under rare earthquake is evaluated. The results show that the fatigue damage degree of each layer of braces is very small in two groups of examples. Under normal conditions, the low cycle fatigue failure of bracing is difficult, and the strength reduction factor can be determined without considering the cyclic load in the design of braces.
【学位授予单位】：河北科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU391
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本文编号：1997307