屈曲约束支撑钢框架的抗震设计方法研究

发布时间：2019-04-10 07:54

【摘要】：在高层钢框架结构设计中，虽然纯框架结构具有很好的延性，但是抗侧刚度较小，横向荷载作用下结构的水平位移较大，因此抗侧力构件的选取和设计非常重要。普通支撑框架弹性阶段刚度较大，延性较小，而且在横向荷载作用下，支撑容易受压屈曲使结构丧失承载力。屈曲约束支撑可以克服普通支撑受压屈曲的问题，经过合理的设计屈曲约束支撑不仅可以增强框架的刚度，而且能够保证支撑在罕遇地震下率先屈服，防止主体结构遭到破坏，从而提高整体结构的抗震性能。在我国屈曲约束支撑的实际工程应用尚处于初步阶段，如何进行合理的设计是一个值得研究的实际问题，，因此探索一种实际可行的屈曲约束支撑的设计方法是非常必要的。首先本文基于国内外大量的研究成果及设计理论，经过计算分析与对比提出了一种简便可行的屈曲约束支撑框架结构的设计方法。其次利用本文提出的设计方法进行屈曲约束支撑钢框架结构设计，采用Midas软件对屈曲约束支撑钢框架结构和普通支撑钢框架结构进行罕遇地震下的时程分析。并提取两种结构的基底剪力、层间位移角进行对比分析。结果表明罕遇地震下屈曲约束支撑能够耗散较多的地震能量，有效的减小结构层间位移及基底剪力。最后对屈曲约束支撑钢框架结构进行Pushover分析，得到结构多遇地震及罕遇地震时的性能点。屈曲约束支撑在多遇地震时为弹性状态，其作用与普通支撑相同。在罕遇地震下屈曲约束支撑的滞回耗能效果明显，增大了结构的阻尼，提高钢框架结构的抗震性能。经过合理设计的屈曲约束支撑钢框架结构，通过查看屈曲约束支撑钢框架结构性能点及其前四步与后一步的铰状态，发现能够达到建筑抗震设计规范的要求。
[Abstract]:In the design of high-rise steel frame structure, although the pure frame structure has good ductility, but the lateral stiffness is small, the horizontal displacement of the structure under transverse load is larger, so it is very important to select and design the anti-lateral force member. In the elastic stage of the common braced frame, the stiffness is larger and the ductility is smaller, and under the action of the transverse load, the brace is liable to buckling under compression and the bearing capacity of the structure is lost. Buckling-constrained braces can overcome the buckling problem of ordinary braces under compression. Through reasonable design of buckling-constrained braces, not only the stiffness of the frame can be enhanced, but also the brace will yield first under rare earthquakes, thus preventing the main structure from being destroyed. As a result, the seismic performance of the whole structure is improved. In China, the practical engineering application of buckling-constrained braces is still in the preliminary stage. How to design reasonably is a practical problem worthy of study. Therefore, it is necessary to explore a practical and feasible design method of buckling-constrained braces. Firstly, based on a great deal of research results and design theories at home and abroad, a simple and feasible design method of buckling-constrained braced frame structure is put forward through calculation, analysis and comparison. Secondly, the design method proposed in this paper is used to design the buckling-constrained braced steel frame structure. The time-history analysis of the buckling-constrained braced steel frame structure and the ordinary braced steel frame structure under rare earthquake is carried out by using Midas software. The base shear force of the two structures is extracted, and the displacement angle between floors is compared and analyzed. The results show that buckling constrained braces under rare earthquakes can dissipate more seismic energy and effectively reduce the inter-story displacement and base shear force of structures. Finally, the Pushover analysis of the buckling-constrained braced steel frame structure is carried out, and the performance points of the structure under frequent and rare earthquakes are obtained. Buckling-constrained braces are elastic in the event of frequent earthquakes, and their action is the same as that of ordinary braces. The hysteretic energy dissipation effect of buckling-constrained braces under rare earthquakes is obvious, which increases the damping of the structure and improves the seismic performance of steel frame structures. It is found that the steel frame structure with buckling-constrained braced structure can meet the requirements of the seismic design code of buildings by examining the performance points and the hinge states of the first four steps and the next step of the buckling-constrained braced steel frame structure.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391;TU352.11

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