共查询到18条相似文献，搜索用时 156 毫秒
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将参数化建模的方法引入减震结构的分析与设计中,通过预设目标和迭代优化计算,以天水市某高层住宅消能减震结构为例,寻找最优的阻尼器布置方案。为评估和验证该消能减震结构的抗震性能,分别采用Perform 3D和ETABS等软件分析结构在多遇和罕遇地震作用下的结构响应,分析结果表明：小震作用下,消能减震结构的楼层位移、层间位移角、楼层弯矩及楼层剪力均减小6.5%以上,达到了设计要求;大震作用下,结构框架柱、框架梁、剪力墙和阻尼器能够满足既定的性能要求,层间位移角满足规范限值,能够达到“大震不倒”的设计目标,研究结果为实际工程预设减震目标和阻尼器优化布置提供参考。 相似文献
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本文以某公共建筑改造工程为背景,针对改造过程中存在的大量梁、柱承载力不足,且主控参数超限等问题,提出了在框架结构中适当位置增设黏滞阻尼器的加固方案,使改造后的结构形成消能减震体系,减小地震作用。采用有限元软件分析了加固方案下结构在多遇和罕遇地震作用下的时程反应,研究了消能减震效果。结果表明,经加固改造后,各主控参数均可满足现行规范要求,大幅度提高了罕遇地震作用下结构抗震性能;通过合理设置黏滞阻尼器,减小了地震作用,大幅度缩小了梁、柱加固范围。 相似文献
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为了研究铅阻尼器在超高层结构中的耗能减震效果,采用非线性分析软件PERFORM-3D对超高层结构进行了罕遇地震作用下的有限元分析,对比了不同地震波作用下的结构弹塑性分析结果。分析结果表明:设置铅阻尼器的超高层建筑结构的抗震性能有了很大的提高,在罕遇地震作用下能够满足"大震不倒"的性能要求。研究为铅阻尼器在超高层结构中的应用提供了成功的工程案例,其设计思路可以为超高层结构的减震控制提供有益的借鉴和参考。 相似文献
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消能支撑框架结构设计方法探讨 总被引：4，自引：0，他引：4
本文提出了一种新的消能支撑框架结构设计方法，该方法能够实现罕遇地震下结构的目标位移控制，其主要设计思路是框架主体结构按非抗震设计或降低烈度进行抗震设计，消能支撑则由罕遇烈度地震下满足给定层间位移角限值的优化计算来确定。本文还给出了一个15层框架结构的设计算例，并把本文方法的设计结果与按常规方法的设计结果进行了比较。 相似文献
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医疗类建筑是抗震救灾的重要场地,如何保证医疗建筑在发生地震时实现“大震不倒”甚至“功能不中断”,成为值得研究的关键问题。对于位于发震断层附近的医疗类建筑,本文以实际项目为例,采用粘滞阻尼器作为一种消能减震的手段,将减震结构与非减震结构在多遇地震和罕遇地震工况下的地震响应进行对比。结果表明:多遇地震工况下,粘滞消能器发生轴向拉压变形开始耗能,能够提供3%的附加阻尼比,主体结构地震力减小,结构构件尺寸较非减震结构能够更好地满足医疗建筑的使用要求;罕遇地震工况下,设置粘滞消能器的结构X与Y向最大层间位移角分别为1/214和1/230,结构塑性铰分布满足“强柱弱梁”的设计准则,整体结构基本满足“大震下功能不中断”的性能要求。 相似文献
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某超高层钢管混凝土框架-混凝土核心筒结构因指标超限在设计中采用了耗能减震技术,为了检验该减震结构的抗震性能,制作了1/35的缩尺模型,通过在钢管混凝土框架设置阻尼器或不设置阻尼器,进行模拟地震振动台对比试验,研究了模型结构的动力特性和不同烈度地震作用下的加速度、位移和应变响应。研究结果表明:地震作用下,该钢管混凝土框架-混凝土核心筒减震结构与钢管混凝土框架-混凝土核心筒结构相比,位移、加速度和应变响应均有一定程度的降低;罕遇地震作用下,通过设置耗能减震构件,层间位移角最大值从超过规范要求的1/84减低至满足规范要求的1/130,表明该减震结构具有更优良的抗震性能。 相似文献
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By advancing the technologies regarding seismic control of structures and development of earthquake resistance systems in the past decades application of different types of earthquake energy dissipation system has incredibly increased. Viscous damper device as a famous and the simplest earthquake energy dissipation system is implemented in many new structures and numerous number of researches have been done on the performance of viscous dampers in structures subjected to earthquake. The experience of recent severe earthquakes indicates that sometimes the earthquake energy dissipation devices are damaged during earthquakes and there is no function for structural control system. So, damage of earthquake energy dissipation systems such as viscous damper device must be considered during design of earthquake resistance structures.This paper demonstrates the development of three-dimensional elasto-plastic viscous damper element consisting of elastic damper in the middle part and two plastic hinges at both ends of the element which are compatible with the constitutive model to reinforce concrete structures and are capable to detect failure and damage in viscous damper device connections during earthquake excitation. The finite element model consists of reinforced concrete frame element and viscous damper element is developed and special finite element algorithm using Newmark׳s direct step-by-step integration is developed for inelastic dynamic analysis of structure with supplementary elasto-plastic viscous damper element. So based on all the developed components an especial finite computer program has been codified for “Nonlinear Analysis of Reinforced Concrete Buildings with Earthquake Energy Dissipation System”. The evaluation of seismic response of structure and damage detection in structural members and damper device was carried out by 3D modeling, of 3 story reinforced concrete frame building under earthquake multi-support excitation. 相似文献
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相对传统结构,自复位墙结构在地震作用下具有更大的变形能力且几乎无残余位移,但其耗能能力较弱,需采用附加阻尼来增加整体耗能.目前,金属阻尼器已广泛用于自复位墙结构,其可显著减小结构大震下的地震响应,但小震下的位移和加速度减震效果不佳.因此,将小变形下即可耗能的黏弹性阻尼器应用于自复位墙结构中.设计一幢10层自复位墙结构,分别采用黏弹性阻尼器和 U 型金属阻尼器作为附加耗能构件,通过弹塑性时程分析对比采用两种耗能机制的结构地震响应.结果表明,黏弹性阻尼器可显著减小自复位墙结构在小震下的位移和加速度响应;U 型金属阻尼器在中震下开始耗能,在大震和巨震下,其减震效果会超越黏弹性阻尼器.因此,为进一步优化自复位墙结构在不同水准地震作用下的抗震性能,建议结合阻尼器的特点进行合理设计. 相似文献
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为研究附设黏滞阻尼器的传统风格建筑混凝土梁-柱节点地震损伤演化规律,进行6个该类型构件的动力荷载试验,并分别采用位移型、能量型及位移-能量混合型损伤模型对其进行全过程评价,采用Park-Ang模型分析试件黏滞阻尼器型号、试件类型等因素对混凝土传统风格建筑梁柱节点损伤行为的影响。研究结果表明：附设黏滞阻尼器可显著提升传统风格建筑节点的承载能力、延性性能及耗能能力,结构的抗震性能得到较大幅度的提升;Park-Ang损伤模型与Banon损伤模型适用于传统风格建筑节点损伤演化规律的描述,建议对该类型节点的损伤规律表征选用该损伤模型。黏滞阻尼器型号可在一定程度上影响传统风格建筑的损伤演化发展;设计阻尼力大的试件虽然延性有所提高,但受荷过程中累积损伤也较大。 相似文献
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消能减震技术用于C类框架学校建筑提高一度抗震设防加固的探讨 总被引：1，自引：0，他引：1
针对既有的C类框架学校建筑提高一度抗震设防的加固目标,从地震作用计算、结构抗震验算和抗震构造措施等方面详细分析了其中的加固难点,指出了应用传统抗震加固方法的一些不足之处,探讨了应用消能减震技术进行结构提高一度抗震设防加固的可行性;并以某C类框架学校建筑加固工程为实例,从减震控制效果分析、弹塑性变形验算、消能部件影响评价、抗震构造措施核查4个方面论证了消能减震加固方法的有效性和可操作性。结果表明,消能减震技术在C类框架学校建筑抗震加固中具有一定的应用优势,不但能有效控制结构的地震响应,而且依据减震效果可以适当降低结构的抗震构造要求。因此,只要通过合理的消能减震加固设计,再辅以额外的局部加强处理,完全可以实现C类框架学校建筑提高一度抗震设防的加固目标需求。 相似文献
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针对平面不规则RC框架结构,从构件安全层次出发提出基于传力路径的减震设计方法。首先根据广义结构刚度法的基本原理计算结构中所有构件的重要性系数,再假定消能支撑的截面参数,取每层最重要的构件位置布置支撑,经支撑在最不利地震组合下的轴力验算后确定支撑的最终设计参数和数量,然后考虑远场、近场有脉冲以及近场无脉冲地震动从双向输入对结构响应的影响,对减震前、后结构分别进行动力时程分析。分析结果表明,利用此方法优化布置支撑能为结构中重要构件提供有效保护,且在小、中、大震下消能支撑均能运作良好,使整体结构响应得到很好地控制。 相似文献
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Self-centering seismic retrofit scheme for reinforced concrete frame structures: SDOF system study 总被引：1，自引：1，他引：0
This paper presents the results of a parametric study of self-centering seismic retrofit schemes for reinforced concrete (RC) frame buildings. The self-centering retrofit system features flag-shaped hysteresis and minimal residual deformation. For comparison purpose,an alternate seismic retrofit scheme that uses a bilinear-hysteresis retrofit system such as buckling-restrained braces (BRB) is also considered in this paper. The parametric study was carried out in a single-degree-of-freedom (SDOF) system framework since a multi-story building structure may be idealized as an equivalent SDOF system and investigation of the performance of this equivalent SDOF system can provide insight into the seismic response of the multi-story building. A peak-oriented hysteresis model which can consider the strength and stiffness degradation is used to describe the hysteretic behavior of RC structures. The parametric study involves two key parameters -the strength ratio and elastic stiffness ratio between the seismic retrofit system and the original RC frame. An ensemble of 172 earthquake ground motion records scaled to the design basis earthquake in California with a probability of exceedance of 10% in 50 years was constructed for the simulation-based parametric study. The effectiveness of the two seismic retrofit schemes considered in this study is evaluated in terms of peak displacement ratio,peak acceleration ratio,energy dissipation demand ratio and residual displacement ratio between the SDOF systems with and without retrofit. It is found from this parametric study that RC structures retrofitted with the self-centering retrofit scheme (SCRS) can achieve a seismic performance level comparable to the bilinear-hysteresis retrofit scheme (BHRS) in terms of peak displacement and energy dissipation demand ratio while having negligible residual displacement after earthquake. 相似文献
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Numerical studies of existing buildings demonstrate the effectiveness of nonlinear/inelastic rooftop tuned mass damper frames (NRTMDF) used as a retrofit for reducing seismic response. The technique utilizes a rooftop penthouse as a tuned mass damper with mass incorporated as the roof deck of the penthouse while targeted nonlinearity and energy dissipation are introduced through buckling restrained braces (BRBs) linking the penthouse mass to the structure below. The writers summarize numerical studies of ten existing buildings modified with a specifically tuned NRTMDF. The studies demonstrate the effectiveness of the technique that stems from elastic and transient inelastic period shifts enabled by the damper coupled with targeted energy dissipation in the penthouse BRBs. Numerical simulations using response nonlinear time‐history analysis techniques show that for many structures and sites, the NRTMDF decreases peak transient response and overall seismic demand of the original structure. The technique also reduces seismic demand on nonstructural elements and components, manifested as reductions in floor acceleration spectra. Energy methods show that the approach enables significant reductions in energy demand on the original structure through the complete earthquake acceleration history. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献