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偏心结构的弹塑性地震反应时程分析 总被引:4,自引:0,他引:4
针对多层偏心结构及弹塑性分析的特点给出空间的简化模型,并提出基于该模型的弹塑性地震反应时程分析方法,编制了程序ZZC,可进行各种偏心结构及考虑楼板变形的弹塑性地震反应计算。 相似文献
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偏心支撑结构弹性阶段刚度大,塑性阶段耗能能力强,是适用于高烈度地震区的一种有效的抗侧力结构体系。采用梁单元与壳单元相结合的非线性有限元模型,对单斜杆型偏心支撑钢框架进行弹塑性时程分析,研究耗能梁段的长度、腹板高厚比和加劲肋间距的变化对单斜杆型偏心支撑钢框架结构抗震性能的影响,提出了相应的抗震设计建议。 相似文献
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偏心支撑钢框架拟动力地震反应试验研究 总被引:8,自引:0,他引:8
本文介绍了一榀偏心支撑钢框架在El Centro(1940 NS)波作用下的拟动力试验,研究了按照一定要求设计的偏心支撑钢框架的地震作用下的性能。 相似文献
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偏心支撑高层建筑的地震反应美国旧金山的Em~大楼(EMB)是1979年按照1976年的美国统一建筑规范要求设计的。在1989年10月间日的7.1级WPrieta地震中,距EMB约100m的Embarcedero超速干道遭到严重的破坏(1991年夷为平... 相似文献
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针对地震动的多维性,建立了结构在多维地震动下的动力平衡方程,并引用Prager随动强化准则模拟了结构的开裂与屈服后的性能,得出了结构在考虑多维地震作用下和只考虑单向水平地震作用下计算结果的一些差异,而且使得计算过程也大为简化。 相似文献
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钢框架弹塑性地震反应简化分析方法 总被引:1,自引:0,他引:1
基于一定的折算规则,本文给出了钢框架结构弹塑性地震反应简化计算的半刚架分析方法。该方法使结构的计算自由度和计算工作量大大减少,且适应性强,计算效果好,可作为钢框架弹塑性地震反应计算的工程实用分析方法。 相似文献
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运用有限元分析软件SAP2000对一个10层的框架结构进行建模,得到两种不同的方案模型,并对这两种方案分别进行双向水平地震作用下的时程分析,通过对结构动力特性结果进行分析,得出偏心支撑抗震性能方面优于中心支撑。 相似文献
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从实际工程出发,在8度区二类场地下,按现行设计标准设计了一榀单跨5层预应力混凝土框架,并选取两条强震记录和一条人工合成记录,对该框架进行8度区罕遇地震作用下的时程分析,分析结果表明,该工程的预应力混凝土框架能够出现混合机制,具有较好的延性和变形能力,能够满足抗震设计要求。 相似文献
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框架-支撑钢结构抗震性能的有限元分析 总被引:5,自引:0,他引:5
近年来,我国的大中城市相继出现了大批的中高层钢结构建筑。框架一支撑结构体系作为中高层的一种结构形式被广泛采用。本文运用大型通用有限元软件ANSYS,采用三维建模,对-9层框架-支撑钢结构建筑进行了抗震性能的计算分析,分析包括模态分析、反应谱分析、弹性刀单塑性时程分析,分析结构在地震作用下的横向变形和支撑随地震波的内力响应情况等。研究成果可以为类似工程提供借鉴。 相似文献
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针对V型偏心支撑钢框架的不同耗能梁段长度,运用有限元分析软件SAP2000对相应的算例进行非线性时程分析。通过对构件内力、节点位移等计算结果的分析,并与D型和K型偏心支撑钢框架非线性时程分析的结果进行比较,得到了一些结论,以供工程设计人员参考。 相似文献
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针对D型偏心支撑钢框架的不同耗能梁段长度,运用有限元分析软件SAP2000对相应的算例进行非线性时程分析。通过对构件内力、节点位移等计算结果的分析得到了一些结论,以供工程设计人员参考。 相似文献
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This paper describes formulation of a hand method that can be used to estimate the computed fundamental periods of vibration of building structures in general and steel eccentrically braced frames (EBFs) in particular. The developed method uses the Rayleigh's method as a basis and utilizes the roof drift ratio (RDR) under seismic forces as a parameter. To obtain RDR, more than 4000 EBFs were designed by considering the seismic hazard, number of stories, braced bay width and link length to bay width ratio as prime variables. A model was developed to estimate RDR, which depends on the rigid plastic deformation mechanism for a typical EBF. The method was verified using design data produced as a part of this work as well as data published in literature. The verifications indicate that the proposed formulation is capable of providing acceptable estimates of the computed period. When compared with existing empirical period–height relationships, the proposed formulation offers closer estimates with reduced scatter. The method was further refined to derive new period–height relationships for two different seismicity regions. The accuracy of the relationship for high seismic regions was verified using measured periods of EBF buildings. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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M. A. Shayanfar A. R. Rezaeian A. Zanganeh 《The Structural Design of Tall and Special Buildings》2014,23(1):1-21
There are special guidelines to design the structures resistant to earthquake forces; parameters such as conditions of the site, seismicity of the site, importance of the structure and the type of the structure are the main effective factors. Consideration of these parameters in calculation and distribution of the earthquake forces are significantly different in various design codes. In most of these design codes, the computation and distribution of earthquake forces are based upon the elastic structural analysis. In this approach, the real behavior of structure is not considered and it may consequently sustain big displacements and irretrievable damages. Therefore, a new design method has been utilized in this paper by which the base shear and its distribution in the height of the structure are calculated according to the plastic behavior of structure and takes advantage of energy balance. The latter is known as performance‐based plastic design method. The study of the behavior of eccentrically braced frames with vertical links while undertaking earthquake loads using performance‐based plastic design method is the main purpose of this study. It is also worthy of notion that the frames are designed using a capacity design method. In addition, the results are compared with those of the International Building Code 2009 method; the results demonstrate that the plastic hinges, the interstory drifts and plastic rotation of links are distributed more uniformly in the height of frames designed by the suggested method compared to International Building Code 2009. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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建立了空间Y型与K型偏心支撑钢框架有限元模型,对两种模型框架进行了单向加载和循环加载试验,对比分析了两种空间偏心支撑框架的屈服强度、极限承载力、侧向刚度、延性和耗能能力等方面受力性能的差异,为工程设计提供参考。 相似文献
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弹塑性静力分析法在结构抗震设计中的应用 总被引:1,自引:0,他引:1
介绍了研究水平地震荷载作用下建筑物反应的静力非线性分析方法(Push-over方法)的基本原理,并考虑了结构进入塑性后因刚度改变造成的自振周期和侧向力的变化,利用Push-over方法对框架结构进行了弹塑性计算,得到了地震作用下的内力分布和变形情况,为抗震设计提供了依据。 相似文献
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对偏心支撑钢框架进行了介绍,简述了偏心支撑钢框架的优点及应用,通过ANSYS有限元程序,研究了轴心压力对K型偏心支撑钢框架抗震性能的影响,得出了设计轴压比应控制在0.6以下才能保证结构的抗震性能充分发挥的结论. 相似文献
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Seismic testing and numerical analysis of Y‐shaped eccentrically braced frame made of high‐strength steel
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In eccentrically braced frame made of high‐strength steel (HSS‐EBF), link and brace are made from conventional steel whereas other structural members use high‐strength steel. Using HSS for beams and columns in EBF can reduce steel consumption and increase economic efficiency. In this paper, one shake table test of a 1:2 scaled three‐story Y‐shaped HSS‐EBF (Y‐HSS‐EBF) specimen was carried out to study its seismic behavior underground motions with different peak ground accelerations. The dynamic properties, base shear force, displacement, and strain responses of the specimen were obtained from this test. In addition, the finite element models of two 10‐story Y‐HSS‐EBF buildings and one 10‐story conventional Y‐EBF building were evaluated for seismic effects. Nonlinear pushover and dynamic analyses were conducted to compare their seismic performance and economy. The results indicated that the specimen exhibited sufficient lateral stiffness and safety but suffered some localized damages. During the high seismic intensity earthquakes, the links of the test specimen were in inelastic to dissipate the earthquake energy, whereas other structural members remained in the elastic state. Under the same design conditions, Y‐HSS‐EBF used less steel than that of conventional Y‐EBF, which could reduce the amount of steel used in Y‐HSS‐EBF. The Y‐HSS‐EBF is a safe, dual system with reliable seismic performance. 相似文献