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框架剪力墙结构模态静力非线性抗震分析方法研究 总被引：5，自引：2，他引：3
本文在模态pushover分析方法基础上推导建立了模态静力非线性分析方法,对一栋10层框架剪力墙结构进行了静力非线性分析,提出了目标位移求解的等效单自由度体系弹塑性时程分析迭代法,计算结果与相应时程分析结果进行了比较,表明两者吻合较好,验证了本文计算方法的有效性。另外,对同一结构,计算分析了在不同水平荷载模式下的静力非线性分析结果,比较不同荷载模式对计算结果的影响,为静力非线性分析方法的推广使用提供参考。 相似文献
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在一种新型无黏结预应力装配式混凝土梁柱框架节点抗震性能试验基础之上，使用基于位移的抗震设计方法对新型框架节点的无黏结预应力装配式钢筋混凝土框架结构进行整体抗震设计研究。首先使用有限元软件sap2000进行预应力三维结构设计并建立相应的有限元模型，同时建立该梁柱节点的梁恢复力模型，进而实现自定义塑性铰本构关系研究该装配式框架结构。使用pushover分析去表征结构的抗震性能，对比研究不同目标位移下的相应性能水平要求。通过施加Y方向均匀分布荷载对结构进行弹塑性推覆分析，对结构的层间位移角、破坏机制进行分析讨论。结果表明：按照"功能良好""生命安全""防止倒塌"三水平的设计均达到预期结果，各层层间位移角和薄弱层的性能均能满足规范的相应要求。并选用三条地震波对结构进行弹塑性动力时程分析，表明基于该新型梁柱节点的装配式结构在基于位移的抗震设计中可以较好满足相关抗震性能水平要求。 相似文献
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型钢混凝土框架pushover分析 总被引：3，自引：0，他引：3
Pushover分析方法是逐渐得到广泛应用的一种评估结构抗震性能的简化方法。由于型钢混凝土（SRC）构件塑性铰属性确定方面的原因,SRC构件难以直接应用于pushover分析方法,而常采用按“等刚度”原则转化为钢筋混凝土构件（RC）进行计算。本文从理论上给出了SRC压弯构件N-M相关曲线、Mx-My相关曲线的形成方法,提出了SRC构件M-φ曲线的确定及转化为塑性铰曲线的原则,并研究了SRC构件塑性铰区等效长度的计算方法,可为SRC结构进行pushover分析提供参考数据。按照本文方法,采用pushover方法对两跨三层SRC框架进行分析,结果与该结构模型振动台实验吻合较好。在此基础上,对10层SRC框架和采用刚度等效的3层、10层的钢筋混凝土（RC）框架进行了对比分析,结果表明,随着层数的增加,SRC结构相对于RC结构表现出更优越的抗震耗能能力。 相似文献
4.
Pushover分析方法中各种不同的侧向荷载分布方式的影响 总被引：3，自引：1，他引：3
目前基于性能的抗震设计研究方兴未艾，其中pushover分析方法作为目前主要的可供操作的抗震设计方法得到广泛的研究。在pushover分析方法中，其中一个关键的问题就是侧向荷载分布方式的确定，因此对各种不同荷载分布方式作综合的分析与比较研究非常有必要。总结了前人所提出的各种不同的侧向荷载分布方式，同时提出一种新的瞬时适应性的侧向荷载分布方式，通过两个实例分析比较了各种不同荷载分布方式的适用范围、有效性及其对结构弹塑性分析结果的影响。 相似文献
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本文给出了一种改进的模态pushover方法,对竖向不规则结构进行抗震性能评估。通过考虑不规则结构高振型的影响,利用模态pushover方法将结构简化为不同的等效单自由度体系,并对其进行弹塑性时程分析,将所得到的结果进行组合,得到原结构的楼层位移和层间位移等性能指标。由于结构处于屈服阶段与处于弹性阶段时的各节点变形的关系有显著区别,因此对于进入塑性阶段的振型,采用屈服后的各节点变形关系计算位移变形响应,将计算得到的各个振型结果组合得到整体结构的位移。通过四个算例分析,表明改进的方法所得到的结果更加接近于弹塑性时程分析的结果,证明此方法能够有效地应用于竖向不规则结构的抗震性能评估与计算。 相似文献
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钢筋混凝土框架结构体系抗震可靠度及其抗力衰减影响分析 总被引：1，自引：0，他引：1
结构体系可靠度分析面临的主要问题是失效模式多,但通过pushover分析方法在一定情况下可以得到结构的最弱失效模式。本文将结构体系抗力等效为与结构特定损伤状况相关的结构的顶点位移,结构的地震作用效应由pushover分析及能力谱法求得。考虑结构体系抗力随机性的主要影响因素以及地震作用的随机性,分别求得了结构抗力及地震作用效应的概率分布参数,通过一次二阶矩方法求得了结构体系可靠度,并进一步研究了结构层数变化及耐久性退化因素对结构体系可靠度的影响。研究发现,结构体系的抗震可靠度水平随着结构层数的增加有减小的趋势,结构体系的抗震可靠度水平随着结构使用期增加而降低,降低幅度与薄弱层个数有关,薄弱层越多,降低幅度越大。 相似文献
8.
钢筋混凝土开洞剪力墙结构抗震非线性有限元分析 总被引：6，自引：1，他引：6
本文以钢筋混凝土开洞剪力墙结构为研究对象，建立了该类结构动力非线性有限元分析计算及该类结构静力非线性pushover有限元分析计算的基本过程，并编制了相应的计算机程序．通过与实验分析结果的比较，检验了本文动力非线性有限元分析计算方法的准确程度，验证了静力非线性pushover有限元分析方法应用于开洞剪力墙抗震非线性性能评估的可靠性。 相似文献
9.
基于能力谱法的SSI体系抗震pushover分析方法 总被引：1，自引：0，他引：1
本文首先经过2次等效将土与结构相互作用的多自由度体系等效为单自由度体系,并给出了修正反应谱和等价能力谱的确定方法,进而提出了基于能力谱法考虑土与结构动力相互作用(SSI)效应的结构体系pushover分析方法(SSIPA);然后对3种不同高度考虑SSI效应的结构体系在5条地震动作用下采用本文提出的方法进行了算例分析,将结果与非线性时程分析的结果进行了比较,研究了本方法的适用性和准确性;最后,与建筑抗震设计规范的设计反应谱相结合,对9层考虑SSI效应的钢结构用本文提出的方法进行了弹塑性地震反应分析,根据我国抗震设计规范的规定进行抗震性能的评估验证了本方法的可行性。 相似文献
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An accurate estimation of the applied load pattern is an essential component in each pushover procedure. Recently, a number of adaptive pushover methods have been proposed in which the effects of the higher modes as well as the progressive changes in the dynamic characteristics of structures are taken into account to compute the applied load pattern. The basic shortcoming of these advanced pushover methods is related to employing the quadratic modal combination rule, whereby the sign reversals of the modal load vectors are suppressed. In this study, an improved displacement-based adaptive pushover method is developed in which the applied load pattern is computed using the factor modal combination rule(FMC). In the proposed procedure, multiple load patterns, depending on the number of the modes considered, are determined in order to take into account the sign reversals of different modal load vectors. The accuracy of the proposed method is verifi ed for seven moment resisting frame buildings of 3, 9 and 20 stories with regularity or vertically geometric and mass irregularities subjected to 60 earthquake ground motion records. The results showed that the proposed methodology is capable of reproducing the peak dynamic responses with very good accuracy. 相似文献
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组合梁-方钢管混凝土柱框架结构抗震性能的pushover分析 总被引：3，自引：0，他引：3
采用考虑组合梁多材料截面引起的正向、负向刚度、强度和承载力不同的截面本构模型,建立了组合梁结构的弹塑性分析模型,对一个15层的钢混凝土组合梁-方钢管混凝土柱框架结构开展了多遇地震、罕遇地震下的pushover分析,为组合框架结构体系的抗震性能分析以及pushover方法在该体系中的应用提供了参考。在此基础上,与钢梁-方钢管混凝土柱框架结构、钢梁-钢筋混凝土柱框架结构进行对比研究,比较了几种结构的动力特性,表明组合梁-方钢管混凝土柱框架结构体系相对于其它两种框架结构体系具有更好的抗震性能。 相似文献
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An improved modal pushover analysis procedure for estimating seismic demands of structures 总被引：7，自引：4，他引：3
The pushover analysis （POA） procedure is difficult to apply to high-rise buildings, as it cannot account for the contributions of higher modes. To overcome this limitation, a modal pushover analysis （MPA） procedure was proposed by Chopra et al. （2001）. However, invariable lateral force distributions are still adopted in the MPA. In this paper, an improved MPA procedure is presented to estimate the seismic demands of structures, considering the redistribution of inertia forces after the structure yields. This improved procedure is verified with numerical examples of 5-, 9- and 22-story buildings. It is concluded that the improved MPA procedure is more accurate than either the POA procedure or MPA procedure. In addition, the proposed procedure avoids a large computational effort by adopting a two-phase lateral force distribution.. 相似文献
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基于性能的抗震设计要求使用非线性静力分析方法来评估新设计或已有消能结构的抗震性能。使用该方法对消能结构抗震性能评估的一个必要条件是要得到结构的推覆曲线。本文基于塑性理论,给出了快速、有效建立附加黏弹性阻尼器框架理想双线型推覆曲线的简化分析方法。使用该方法构建附加阻尼体系的推覆曲线无需借助结构分析软件。将3种侧向荷载模式(第1振型模式、FEMA-273模式和均布模式)作用下的简化分析结果与结构分析软件的推覆分析结果进行了比较,表明基于塑性理论的简化分析方法能够较准确地预测附加黏弹性阻尼器框架的推覆曲线,只要结构失效时能形成梁铰型侧移机构。 相似文献
15.
Lateral load pattern in pushover analysis 总被引：9，自引：2，他引：7
The seismic capacity curves of three types of buildings including frame, frame-shear wall and shear wall obtained by pushover
analysis under different lateral load patterns are compared with those from nonlinear time history analysis. Based on the
numerical results obtained a two-phase load pattern; an inverted triangle (first mode) load pattern until the base shear force
reachesβ times its maximum value, Vmax, followed by a (x/H)α form, hereβ and α being some coefficients depending on the type of the structures considered, is proposed in the paper, which can provide
excellent approximation of the seismic capacity curve for low-to-mid-rise shear type buildings. Furthermore, it is shown both
the two-phase load pattern proposed and the invariant uniform pattern can be used for low-to-mid-rise shear-bending type and
low-rise bending type of buildings. No suitable load patterns have been found for high-rise buildings. 相似文献
16.
一种基于位移的改进静力弹塑性分析方法 总被引：6，自引：0，他引：6
静力弹塑性分析作为一种新的结构抗震性能评估方法，近些年得到很大的推广。本文在已有的研究基础上，通过一种基于位移控制的多阶振型组合的静力推覆分析，采用自适应的水平加载方式，考虑高阶振型的影响。对一中等高度的结构进行推覆分析，结果表明，与采用不变的水平菏载分布形式的一般静力推覆分析比较，基于本文Pushover分析所得的结构响应与非线性动力时程分析所得结构的响应更为近似，尤其在受结构高阶振型影响较明显的结构层间位移角及层间剪力方面，其结果同动力时程分析所得更为接近。 相似文献
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Improving seismic performance is one of the critical objectives in earthquake engineering. With the development of economy and society, reparability and fast resilience of a structure are becoming increasingly important. Reinforced concrete (RC) frame structure is prone to soft story mechanism. As a result, deformation and damage are so concentrated that reparability is severely hampered. Rocking wall provides an available approach for deformation control in RC frame by introducing a continuous component along the height. Previous researches mostly focus on seismic responses of rocking wall frame structures, while damage mode and reparability have not been investigated in detail. In this study, a novel infilled rocking wall frame (IRWF) structure is proposed. A half‐scaled IRWF model was designed according to Chinese seismic design code. The model was subjected to cyclic pushover testing up to structure drift ratio of 1/50 (amplitude 1/50), and its reparability was evaluated thereafter. Retrofit was implemented by wrapping steel plates and installing friction dampers. The retrofitted model was further loaded up to amplitude 1/30. The IRWF model showed excellent reparability and satisfactory seismic performance on deformation control, damage mode, hysteresis behavior, and beam‐to‐column joint rotation. After retrofitting, capacity of the model was improved by 11% with limited crack distribution. The model did not degrade until amplitude 1/30, due to shear failure in frame beams. The retrofit procedure was proved effective, and reparability of the IRWF model was demonstrated. Seismic resilience tends to be achieved in the proposed system. 相似文献
18.
《地震工程与工程振动(英文版)》2015,(3)
In an incremental dynamic analysis(IDA) using a set of ground motion records,nonlinear time history analysis needs to be performed on structures.It is well recognized that IDA calls for high computational efforts and the results are highly sensitive to selected ground motions.As a result,alternative static methods are needed.This study aims to introduce a new double-stage(N1- N2) static method to estimate capacity curves of MR frames.The technique is regulated to resemble IDA results with specific emphasis on near-field ground motions.Using an ensemble of 56 near-field earthquake records,required ID As have been carried out for SAC-Los Angeles 3-,9- and 20-story buildings and an additional 15-story building.The results of the proposed static method are compared with those from IDA,displacement-based adaptive procedure(DAP),and multimodal procedure(MMP).The results indicate that in addition to enhanced accuracy,very little time is required in the case of N1-N2 method.Thus,for the 3-story structure,the time required is less than 1 minute.The proposed N1-N2 method shows the best accuracy in terms of lateral mechanisms for the 15-story frame while for the other cases,the first mode load pattern leads to the best accuracy. 相似文献
19.
Estimating seismic demands on structures, to predict their performance level with confidence, requires explicit consideration
of the structural inelastic behaviour: to this end, the use of nonlinear static procedures is inevitably going to be favoured
over complex nonlinear time-history methods.
The currently available assessment procedures have been tested predominantly against building frames. A newly derived assessment
procedure is proposed within the scope of bridge applications, based on an innovative displacement-based adaptive pushover
technique. The procedure, which can be incorporated into a performance-based engineering philosophy, is applicable to MDOF
continuous span bridges with flexible or rigid superstructures, and for varying degrees of abutment restraint.
As a first application to determine the viability of the proposed procedure, a parametric study is conducted on a ensemble
of bridges subjected to earthquake motion. It is shown that, compared to the seismic demand estimated by means of the more
accurate nonlinear dynamic analysis tool, the novel static assessment method can lead to the attainment of satisfactory predictions,
both in terms of displacement as well as moment demand on members. 相似文献
20.
K形高强钢组合偏心支撑(K-HSS-EBF)是指耗能连梁和支撑采用Q345钢,而框架梁、框架柱采用高强度钢(如Q460)。为研究其在罕遇地震作用下的抗震性能,在试验研究的基础上,采用直接基于位移的抗震设计方法设计了5层、8层和12层算例,分别进行静力推覆分析和动力弹塑性分析,研究高强钢组合偏心支撑钢框架在罕遇地震作用下层间侧移分布和破坏模式。研究结果表明:直接基于位移的抗震设计方法设计的算例在罕遇地震作用下,结构的层间侧移满足我国现行抗震规范的要求,结构呈理想的渐进式梁铰屈服机构,并证明该设计方法的合理性和可靠性。 相似文献