共查询到19条相似文献，搜索用时 187 毫秒
1.
带缝空心RC剪力墙结构变形与耗能性能研究 总被引：1，自引：0，他引：1
为了研究带缝空心钢筋混凝土剪力墙结构的抗震性能,本文进行了六层1／3．0比例模型房屋的拟动力及拟静力试验,分析了带缝空心钢筋混凝土剪力墙结构在地震作用下的变形与耗能性能,探讨了结构在地震作用下的破坏机理、滞回特性及其薄弱环节或部位。试验结果表明：该结构模型延性的弯剪破坏形态与普通钢筋混凝土剪力墙结构不同;竖缝的设置增加了结构在弹塑性阶段的变形及耗能能力,结构具有较强的变形及耗能能力。作为一种抗震性能良好的新型的结构形式,带缝空心钢筋混凝土剪力墙结构具有一定的工程推广应用前景。 相似文献
2.
本文通过一座三层的耗能－隔震柔性底层钢管混凝土结构模型和一座三层普通钢筋混凝上结构模型的振动台实验，着重研究了耗能－隔震柔性底层钢管混凝上结构的抗震性能和减震效果，并与普通的钢筋混凝土结构的实验进行了分析比较，研究了两种结构体系在地震作用下的耗能分布和地震累积损伤情况。实验结果表明，耗能－隔震柔性底层能够有效地吸收地震输入的大部分能量，防止和减小了上部结构的地震破坏．文中还讨论了耗能－隔震柔性底层结构中钢管混凝土柱与橡胶隔震器之间的轴力分配以及在水平变形下的稳定性问题． 相似文献
3.
传统高层建筑地震损伤模型不能反映构件极限滞回耗能随累积幅值的改变情况,无法有效确定组合参数,离散性较大。为此,设计一种远场长周期地震下高层建筑的地震损伤模型。针对不同层次高层建筑结构,依据广义力-广义变形曲线,构建变形损伤模型。结合累积能量比、远场长周期地震瞬时输入能比构建能量损伤模型。从变形与能量两方面综合评价损伤,依据钢筋混凝土结构构建最大反应变形与耗损能量的线性组合地震损伤模型,并对其进行改进。实验选用ILA003、ILA048和TCU115三种长周期地震波,计算不同构件和高层建筑结构整体损伤结果,验证所提模型的可靠性。将所提模型应用于实际高层建筑中,发现其实用性强。 相似文献
4.
耗能支撑钢筋混凝土框架结构抗震性能研究 总被引：7，自引：0，他引：7
本文通过普通钢筋混凝土框架、耗能支撑钢筋混凝土框架结构１／８比例模型的地震模拟振动台对比试验,研究两类框架结构在地震作用下的破坏形态和动力特征,揭示了耗能支撑钢筋混凝土框架结构良好的抗震性能;对试验模型进行了弹塑性时程分析,理论分析和试验结果符合较好;结合扬州电厂二期主厂房框排架结构,研究了其纵向框架结构采用耗能支撑体系时结构的抗震性能,为该类结构型式的工程应用提供依据 相似文献
5.
耗以支撑钢筋混凝土框架结构抗震性能研究 总被引：2，自引：0，他引：2
本文通过普通钢筋混凝土框架、耗能支撑钢筋混凝土框架结构１／８比例模型的地震模拟震动台对比试验,研究两类框架结构在地震作用下的破坏形态和动力特征,揭示了耗能支撑钢筋混凝土框架结构良好的抗震性能;以试验模型进行了弹塑性时程分析,理论分析和试验结果符合较好;结合场州电厂二期主厂房框架结构,研究了其纵向框架结构采用耗能支撑体系时结构的抗震性能,为该类结构形式的工程应用提供依据。 相似文献
6.
一种新型抗震耗能剪力墙结构—结构的抗震性能研究 总被引：3，自引：0，他引：3
本文根据两个十层新型抗震耗能剪力墙结构模型的振动台试验结果，研究了这种结构的地震反应、变形特性和耗能机理、提出了进行非线性地震反应分析的计算模型，并与试验结果进行了对比，在此基础上进行了参数研究，分析了结构主要参数的变化对抗震性能的影响。 相似文献
7.
本文通过一座三层的耗能－隔震柔性底层钢管混凝土结构模型和一座三层普通钢筋混凝土结构模型的振动台实验，着重研究了耗能－隔震柔性底层钢管混凝土结构的抗震性能和减震效果，并与普通的钢筋混凝土结构的实验进行了分析比较，研究了两种结构体系在地震作用下的耗能分布和地震累积损伤情况。 相似文献
8.
强震持时对钢筋混凝土结构地震累积破坏的影响 总被引：2，自引：1，他引：2
本文在计算模型中考虑了钢筋混凝土结构的低周疲劳性能,建立了一种以退化刚度比作为破坏参数的地震破坏评估模型,此模型不仅能够反映大变形破坏,而且也能反映累积损伤效应。在此基础上,文中还研究了强震持时对钢筋混凝土结构累积破坏的影响。结果表明:对于中强长持时地震,低周疲劳效应十分明显地增大了结构的破坏程度,而且强震动持时对结构的累积破坏与结构的非线性变形的低周疲劳效应关系密切。 相似文献
9.
《世界地震工程》2017,(2)
为了能够在往复推覆分析中考虑结构能量耗散历程特征的影响,首先根据结构单向耗能能力曲线和耗能需求曲线的交点确定结构在相应地震作用下的延性需求与最大瞬时变形能需求,进而由延性需求得结构的累积滞回耗能需求;其次在已知最大瞬时变形能、累积滞回耗能和能量增长持时的基础上,根据简化模型获得结构变形能耗散历程曲线,该曲线从能量的角度综合体现了地震对结构的峰值效应、累积效应和历程效应,从而实现完全以能量为推覆控制目标的静力非线性分析。研究表明:该往复推覆分析方法能够较为准确的估计钢筋混凝土框架结构在地震作用下的最大层间位移、累积滞回耗能以及滞回耗能在构件中的分布状况。 相似文献
10.
针对高层钢筋混凝土框架支撑结构体系，运用结构塑性极限分析原理给出了在水平地震作用下最可能出现的破坏机构及相应的极限荷载半解析度，根据上限定理求出水平地震作用下一榀框架支撑体系各种破坏机构的最小破坏荷载。再根据刚度分配原则，可计算出整个结构不形成机动体系所能承担的最大水平地震作用。 相似文献
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12.
为了对混凝土框架结构的地震破坏机制和抗震性能进行控制,在框架柱中配置高强钢筋,并将纤维增强混凝土(FRC)用于框架结构的预期损伤部位。结构柱中的高强钢筋用来减小结构的残余变形,FRC材料用来增加结构的耗能能力和损伤容限。设计了三个框架,采用动力弹塑性时程分析方法进行分析。研究结果表明,采用高强钢筋提高了结构的整体承载能力,在层间侧移角达到3%之前避免了柱铰的出现(包括底层柱底),并且减小了结构的残余变形;预期损伤部位采用FRC材料能够提高结构的塑性耗能。 相似文献
13.
Non-linear seismic behavior of structures with limited hysteretic energy dissipation capacity 总被引：1，自引：0，他引：1
Pierino Lestuzzi Youssef Belmouden Martin Trueb 《Bulletin of Earthquake Engineering》2007,5(4):549-569
This paper investigates the non-linear seismic behavior of structures such as slender unreinforced masonry shear walls or
precast post-tensioned reinforced concrete elements, which have little hysteretic energy dissipation capacity. Even if this
type of seismic response may be associated with significant deformation capacity, it is usually not considered as an efficient
mechanism to withstand strong earthquakes. The objective of the investigations is to propose values of strength reduction
factors for seismic analysis of such structures. The first part of the study is focused on non-linear single-degree-of-freedom
(SDOF) systems. A parametric study is performed by computing the displacement ductility demand of non-linear SDOF systems
for a set of 164 recorded ground motions selected from the European Strong Motion Database. The parameters investigated are
the natural frequency, the strength reduction factor, the post-yield stiffness ratio, the hysteretic energy dissipation capacity
and the hysteretic behavior model (four different hysteretic models: bilinear self-centring, with limited or without energy
dissipation capacity, modified Takeda and Elastoplastic). Results confirm that the natural frequency has little influence
on the displacement ductility demand if it is below a frequency limit and vice versa. The frequency limit is found to be around
2 Hz for all hysteretic models. Moreover, they show that the other parameters, especially the hysteretic behavior model, have
little influence on the displacement ductility demand. New relationships between the displacement ductility demand and the
strength reduction factor for structures having little hysteretic energy dissipation capacity are proposed. These relationships
are an improvement of the equal displacement rule for the considered hysteretic models. In the second part of the investigation,
the parametric study is extended to multi-degree-of-freedom (MDOF) systems. The investigation shows that the results obtained
for SDOF systems are also valid for MDOF systems. However, the SDOF system overestimates the displacement ductility demand
in comparison to the corresponding MDOF system by approximately 15%. 相似文献
14.
高强混凝土剪力墙地震损伤模型分析 总被引：4，自引：0，他引：4
在分析比较现有钢筋混凝土结构的地震损伤模型的基础上,根据高强混凝土剪力墙的滞回曲线特性及刚度退化规律,采用能量耗散系数和最大变位处的卸载刚度的退化为破坏参数,提出了适用于高强混凝土剪力墙构件的双参数地震损伤模型。依据已有的高强混凝土剪力墙构件试验研究结果,对损伤模型进行非线性回归分析,确定了相应的地震损伤模型参数,提出了高强混凝土剪力墙各性能水平的损伤指数以及相应于三水准抗震设防的损伤指数允许值。分析结果表明,按本文所提出的损伤模型计算得到的剪力墙构件最终破坏时对应的损伤指数,其平均值在合理范围内,标准差较小;损伤指数计算值对应的损伤程度基本符合试验结果,计算结果离散程度较低。 相似文献
15.
Seismic performance and damage evaluation of a reinforced concrete frame with hysteretic dampers through shake‐table tests 
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下载免费PDF全文 Passive energy dissipation devices are increasingly implemented in frame structures to improve their performance under seismic loading. Most guidelines for designing this type of system retain the requirements applicable to frames without dampers, and this hinders taking full advantage of the benefits of implementing dampers. Further, assessing the extent of damage suffered by the frame and by the dampers for different levels of seismic hazard is of paramount importance in the framework of performance‐based design. This paper presents an experimental investigation whose objectives are to provide empirical data on the response of reinforced concrete (RC) frames equipped with hysteretic dampers (dynamic response and damage) and to evaluate the need for the frame to form a strong column‐weak beam mechanism and dissipate large amounts of plastic strain energy. To this end, shake‐table tests were conducted on a 2/5‐scale RC frame with hysteretic dampers. The frame was designed only for gravitational loads. The dampers provided lateral strength and stiffness, respectively, three and 12 times greater than those of the frame. The test structure was subjected to a sequence of seismic simulations that represented different levels of seismic hazard. The RC frame showed a performance level of ‘immediate occupancy’, with maximum rotation demands below 20% of the ultimate capacity. The dampers dissipated most of the energy input by the earthquake. It is shown that combining hysteretic dampers with flexible reinforced concrete frames leads to structures with improved seismic performance and that requirements of conventional RC frames (without dampers) can be relieved. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
16.
铅芯橡胶支座（lead-rubber bearing,LRB）是目前应用最为广泛的减隔震装置,普遍应用于建筑、桥梁、储罐和核电站等结构,其抗震性能已在屡次地震中得以验证。当LRB承受大幅值的往复变形时,其力学性能受内部铅芯发热的影响而发生显著变化,主要表现在滞回耗能、特征强度和刚度的降低等方面。首先,总结了铅芯橡胶支座及其结构在以往地震中的震害情况,介绍了预测LRB内部铅芯变形发热和温度升高的理论及近似求解方法,以及基于试验和有限元的验证方法及注意事项;其次,概述了LRB因内部铅芯变形发热导致其强度退化的分析模型和强度退化对结构地震反应的影响;最后,归纳了隔震结构在进行模型试验时,铅芯橡胶支座的相似理论和缩尺问题。 相似文献
17.
针对目前RC框架结构地震易损性分析中整体损伤模型研究的薄弱性以及广泛采用的层间位移角方法不能准确反应结构在地震作用下损伤机理的现状,本文基于现有损伤模型的对比分析,提出了一种较准确反映地震破坏机理同时便于应用的最大变形和滞回耗能非线性组合的双参数损伤模型。以8层RC框架结构为例,进行50条地震波作用下的结构增量动力分析,分别绘制了变形和能量2种单参数模型以及牛荻涛模型和本文模型两种双参数模型的结构损伤曲线与易损性曲线,并进行了模型的对比分析和检验评估。分析结果表明:仅以层间位移角作为结构整体损伤指标会高估结构的抗倒塌性能,仅以能量作为结构整体损伤指标会低估结构损伤的超越概率。本文模型能较好地平衡最大变形和累积损伤对结构损伤的影响程度。 相似文献
18.
利用有限元软件SAP2000建立了某公路简支梁桥的有限元模型,以7条典型强震记录为输入,研究了公路简支梁桥的地震能量响应及其分配规律。结果表明:①地基柔性效应对公路简支梁桥的地震能量响应及其分配规律的影响较小;②当场地土质变软时,地震总输入能、结构阻尼耗能和结构阻尼耗能比均呈递增趋势,而结构滞回耗能和结构滞回耗能比则不断减小,即地基土体作为桥梁动力系统的一部分,增大了系统阻尼,并分担了部分非弹性变形;③随着PGA增大,输入结构的地震能量也增加,导致塑性铰的非弹性变形增加,即结构滞回耗能和结构阻尼耗能增大。 相似文献
19.
This paper presents a new way of selecting real input ground motions for seismic design and analysis of structures based on a comprehensive method for estimating the damage potential of ground motions, which takes into consideration of various ground motion parameters and structural seismic damage criteria in terms of strength, deformation, hysteretic energy and dual damage of Park & Ang damage index. The proposed comprehensive method fully involves the effects of the intensity, frequency content and duration of ground motions and the dynamic characteristics of structures. Then, the concept of the most unfavourable real seismic design ground motion is introduced. Based on the concept, the most unfavourable real seismic design ground motions for rock, stiff soil, medium soil and soft soil site conditions are selected in terms of three typical period ranges of structures. The selected real strong motion records are suitable for seismic analysis of important structures whose failure or collapse will be avoided at a higher level of confidence during the strong earthquake, as they can cause the greatest damage to structures and thereby result in the highest damage potential from an extended real ground motion database for a given site. In addition, this paper also presents the real input design ground motions with medium damage potential, which can be used for the seismic analysis of structures located at the area with low and moderate seismicity. The most unfavourable real seismic design ground motions are verified by analysing the seismic response of structures. It is concluded that the most unfavourable real seismic design ground motion approach can select the real ground motions that can result in the highest damage potential for a given structure and site condition, and the real ground motions can be mainly used for structures whose failure or collapse will be avoided at a higher level of confidence during the strong earthquake. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献