屈曲約束支撐鋼框架的抗震設計方法研究
發(fā)布時間：2019-04-10 07:54
【摘要】：在高層鋼框架結構設計中，雖然純框架結構具有很好的延性，但是抗側剛度較小，橫向荷載作用下結構的水平位移較大，因此抗側力構件的選取和設計非常重要。普通支撐框架彈性階段剛度較大，延性較小，而且在橫向荷載作用下，支撐容易受壓屈曲使結構喪失承載力。屈曲約束支撐可以克服普通支撐受壓屈曲的問題，經過合理的設計屈曲約束支撐不僅可以增強框架的剛度，而且能夠保證支撐在罕遇地震下率先屈服，防止主體結構遭到破壞，從而提高整體結構的抗震性能。 在我國屈曲約束支撐的實際工程應用尚處于初步階段，如何進行合理的設計是一個值得研究的實際問題，，因此探索一種實際可行的屈曲約束支撐的設計方法是非常必要的。 首先本文基于國內外大量的研究成果及設計理論，經過計算分析與對比提出了一種簡便可行的屈曲約束支撐框架結構的設計方法。 其次利用本文提出的設計方法進行屈曲約束支撐鋼框架結構設計，采用Midas軟件對屈曲約束支撐鋼框架結構和普通支撐鋼框架結構進行罕遇地震下的時程分析。并提取兩種結構的基底剪力、層間位移角進行對比分析。結果表明罕遇地震下屈曲約束支撐能夠耗散較多的地震能量，有效的減小結構層間位移及基底剪力。 最后對屈曲約束支撐鋼框架結構進行Pushover分析，得到結構多遇地震及罕遇地震時的性能點。屈曲約束支撐在多遇地震時為彈性狀態(tài)，其作用與普通支撐相同。在罕遇地震下屈曲約束支撐的滯回耗能效果明顯，增大了結構的阻尼，提高鋼框架結構的抗震性能。經過合理設計的屈曲約束支撐鋼框架結構，通過查看屈曲約束支撐鋼框架結構性能點及其前四步與后一步的鉸狀態(tài)，發(fā)現(xiàn)能夠達到建筑抗震設計規(guī)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.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU391;TU352.11
本文編號：2455626
[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.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU391;TU352.11
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