防屈曲耗能支撑在某钢框架加层加固中的应用

发布时间：2018-11-13 13:52

【摘要】：防屈曲耗能支撑作为一种新型的支撑构件,它是在普通钢支撑的基础上进行改进的,其功能与普通钢支撑基本一致,但是在反复荷载作用下支撑构件屈服而不屈曲,从而实现构件无论在受压还是在受拉都能全截面屈服。在罕遇地震作用下,支撑构件通过自身良好的滞回性能来耗散结构所受到的主要地震能量,真正的起到了保护主体结构的作用。尽管前人对其做了大量的理论研究,但是在实际工程应用中,并未形成统一的认知和设计操作方法。有鉴于此,本文作者在查阅相关文献并结合工程实际案例的基础上,以期实现两个目的：(1)探索一种有效地具有可操作性的实际应用设计分析方法(2)通过在对某钢框架案例分析设计运用中,希望得到一些能用于指导工程实际设计的防屈曲耗能支撑布置形式的建议。主要内容如下：(a)根据实际案例的特点,提出一种普通支撑结构方案和四种带有防屈曲耗能支撑的混合支撑结构方案。(b)分别采用PKPM和SAP2000对上述各个方案进行模态分析,对比分析周期,以此相互验证模型的正确性以及对各个方案的结构本质特征予以了解。(c)运用PKPM和SAP2000对各个方案进行反应谱法分析,查看弹性层间位移角,弹性水平位移,基底剪力等参数,相互验证对比分析结果,并使其满足中国规范要求。(d)运用SAP2000对不同的结构方案进行罕遇地震下的非线性时程分析,分别对比各个结构方案的技术数据,以此来检验各个方案的抵抗大震的能力和防屈曲支撑的耗能能力。通过以上的工作,可以得到以下结论：1)防屈曲耗能支撑对比普通支撑,在罕遇地震作用下,耗能明显,性能更优；2)防屈曲耗能支撑必须通过概念加计算确定布置方式及位置,不能随意设置；3)在满足建筑要求的前提下,尽量使用众多小型支撑去替代少数大型支撑：4)对于结构中设置的BRB,如果不能屈服耗能,应予以替换成普通支撑,以增加结构安全性并提高经济性；5)防屈曲耗能支撑的设置应尽量使结构物的刚心质心重合6)本文提出的此类结构设计流程是具有一定实用性的。
[Abstract]:As a new type of bracing member, the anti-buckling energy dissipation bracing is improved on the basis of the ordinary steel bracing, and its function is basically the same as that of the ordinary steel bracing, but under the action of repeated load, the bracing member yields without buckling. Thus, the full section yield can be realized both in compression and in tension. Under the rare earthquake, the main seismic energy of the structure is dissipated by the good hysteretic performance of the bracing member, which really plays the role of protecting the main structure. Although the predecessors have done a lot of theoretical research, but in practical engineering applications, there is no unified cognitive and design operation methods. In view of this, on the basis of consulting relevant literature and combining with practical engineering cases, In order to achieve two purposes: (1) to explore an effective practical design and analysis method which is operable; (2) to apply it in the analysis and design of a steel frame case. It is hoped that some suggestions on the arrangement of anti-buckling energy dissipation braces can be used to guide the practical design of engineering. The main contents are as follows: (a) according to the characteristics of the actual case, A general bracing scheme and four hybrid bracing schemes with anti-buckling and energy-dissipation bracing are proposed. PKPM and SAP2000 are used to analyze the modes of each of the above schemes, respectively, and the period of analysis is compared. In order to verify the correctness of the model and to understand the essential structural characteristics of each scheme,. (c) uses PKPM and SAP2000 to analyze each scheme by using the response spectrum method to check the displacement angle between elastic layers and the elastic horizontal displacement. The parameters, such as basement shear force, are verified and compared with each other, and the results are verified to meet the requirements of the Chinese code. (d) uses SAP2000 to carry out nonlinear time-history analysis of different structural schemes under rare earthquakes, and compares the technical data of each structural scheme, respectively. The capability of resisting earthquake and the energy dissipation of buckling braces are tested. Through the above work, we can get the following conclusions: 1) the anti-buckling energy dissipation bracing pair is better than the ordinary bracing, under the rare earthquake action, the energy consumption is obvious, the performance is better; 2) the anti-buckling energy dissipation bracing must be determined by the concept addition calculation, the arrangement way and the position must not be set at will; 3) under the premise of meeting the construction requirements, we should use as many small braces as possible to replace a few large ones. 4) if the BRB, installed in the structure cannot yield to energy consumption, it should be replaced by ordinary brace. In order to increase the safety of the structure and improve the economy; 5) the installation of anti-buckling energy dissipation braces should make the rigid center of mass of the structure coincide with the center of mass as far as possible. 6) the design flow of this kind of structure proposed in this paper is practical to a certain extent.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391;TU352.1

【相似文献】