本文選題：V型偏心支撐 + 屈曲約束支撐��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：偏心支撐鋼框架通過耗能梁發(fā)生剪切變形來耗能,其側(cè)向支撐不發(fā)生屈曲才能確保耗能梁發(fā)生剪切屈服。但在結(jié)構(gòu)跨度和高度較大時(shí),側(cè)向支撐需要增加截面面積來滿足自身穩(wěn)定性能和軸壓比的要求,這將導(dǎo)致結(jié)構(gòu)自重和建造成本的增大。屈曲約束支撐在受拉和受壓下不易發(fā)生屈曲且耗能效果好,因此用屈曲約束支撐代替偏心支撐鋼框架的側(cè)向支撐,具有一定的研究?jī)r(jià)值。本論文以帶屈曲約束支撐的V型偏心支撐鋼框架為研究對(duì)象,首先將模型進(jìn)行簡(jiǎn)化,對(duì)其單自由度模型的等效阻尼和等效剛度進(jìn)行計(jì)算,并分析其設(shè)計(jì)要點(diǎn)。建立普通V型偏心支撐鋼框架(VEBF)和帶屈曲約束支撐的V型偏心支撐鋼框架(VEBF-B)分析模型,通過Push-over分析表明:屈曲約束支撐能夠減緩框架柱塑性鉸的發(fā)展速度,對(duì)框架柱進(jìn)行了保護(hù),有利于實(shí)現(xiàn)抗震設(shè)防“強(qiáng)柱弱梁”的目標(biāo)。其次本論文通過對(duì)比VEBF-B框架和VEBF框架的時(shí)程分析,多遇地震作用下,得到VEBF-B框架的頂點(diǎn)側(cè)移、基底剪力和頂點(diǎn)加速度都要比VEBF框架較小,但相差不是很明顯。主要原因是大多數(shù)屈曲約束支撐在多遇地震作用下并沒有發(fā)生屈服,其作用和普通支撐基本一樣,只是增加結(jié)構(gòu)的抗側(cè)剛度。罕遇地震作用下,VEBF-B框架和VEBF框架的抗震性能具有很大的差異,VEBF-B框架的頂點(diǎn)側(cè)移、基底剪力和頂點(diǎn)加速度都得到明顯減少。主要原因是VEBF-B框架中大量的屈曲約束支撐發(fā)生了屈服,其耗能優(yōu)勢(shì)使得整個(gè)結(jié)構(gòu)變得更合理。VEBF-B框架的基底剪力得到有效的減少,不僅有利于提高結(jié)構(gòu)的抗震性能,還對(duì)降低結(jié)構(gòu)造價(jià)具有很大的優(yōu)勢(shì)。最后本論文從基于能量平衡原理對(duì)結(jié)構(gòu)進(jìn)行能量分析,結(jié)果表明:在VEBF-B框架中加設(shè)屈曲約束支撐,有利于減輕地震作用對(duì)主體結(jié)構(gòu)的損傷,屈曲約束支撐耗散大部分地震能量;地震作用下輸入到結(jié)構(gòu)中的能量越多,屈曲約束支撐耗散能量的比例越大。研究VEBF-B框架的抗震性能,對(duì)進(jìn)一步優(yōu)化結(jié)構(gòu)的抗震設(shè)計(jì)和建筑物的經(jīng)濟(jì)性能具有一定的理論意義和實(shí)用價(jià)值。
[Abstract]:Eccentrically braced steel frame dissipates energy through shear deformation of energy dissipation beam, and the lateral bracing does not buckle in order to ensure shear yield of energy dissipation beam. However, when the span and height of the structure are large, the lateral bracing needs to increase the cross-section area to meet the requirements of its own stability performance and axial compression ratio, which will lead to the increase of structural weight and construction cost. Buckling restrained braces are not easy to buckle under tension and compression and the energy dissipation effect is good. Therefore, it is valuable to study the lateral braces of eccentric braced steel frames by buckling restrained braces instead of eccentrically braced steel frames. In this paper, the V-shaped eccentrically braced steel frame with buckling constraints is taken as the research object. Firstly, the model is simplified, the equivalent damping and stiffness of the single-degree-of-freedom model are calculated, and the key points of its design are analyzed. The analysis models of common V-type eccentrically braced steel frame (VEBF) and V-type eccentrically braced steel frame (VEBF-B) with buckling constraint braces are established. The Push-over analysis shows that buckling restrained braces can slow down the development of plastic hinges of frame columns. The frame column is protected, which is propitious to achieve the goal of seismic fortification of "strong column and weak beam". Secondly, by comparing the time history analysis of VEBF-B frame and VEBF frame, it is found that the peak of VEBF-B frame moves sideways and the base shear force and peak acceleration are smaller than that of VEBF frame, but the difference is not obvious. The main reason is that most buckling restrained braces do not yield under the frequent earthquake. The effect of buckling restrained braces is basically the same as that of common braces and only increases the lateral stiffness of the structures. The seismic behavior of VEBF-B frame and VEBF frame under rare earthquake is very different. The vertex of VEBF-B frame is shifted sideways and the base shear force and the acceleration of vertex are obviously reduced. The main reason is that a large number of buckling restrained braces in VEBF-B frame yield, and the advantages of energy dissipation make the whole structure become more reasonable. VEBF-B frame base shear force is effectively reduced, which is not only conducive to improving the seismic performance of the structure. It also has a great advantage in reducing the cost of structure. Finally, the energy analysis of the structure based on the principle of energy balance is carried out. The results show that the addition of buckling constraint braces in the VEBF-B frame is helpful to reduce the damage caused by earthquake to the main structure, and the buckling constraint bracing dissipates most of the seismic energy. The more energy input into the structure under seismic action, the larger the proportion of dissipative energy of buckling restrained braces. The study of seismic performance of VEBF-B frame has certain theoretical significance and practical value for further optimization of seismic design of structures and economic performance of buildings.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU391

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