共查询到19条相似文献,搜索用时 171 毫秒
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玻璃自重对点式玻璃建筑柔性支承动力特性的影响 总被引:2,自引:0,他引:2
以清华大学游泳馆点式玻璃建筑设计为背景,对点式玻璃建筑中玻璃自重对两种常用的柔性支承系统的动力特性的影响进行了研究。对比分析了考虑玻璃自重与不考虑玻璃自重在矢跨比和拉索预应力变化时柔性支承体系动力特性的差异。同时,对比分析了两种情况下两种常用柔性支承的风振响应的谱分析。 相似文献
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主要研究点支式玻璃幕墙中索杆和索网柔性支承体系与玻璃面板的共同作用。首先分别对有玻璃面板参与工作和无玻璃面板参与工作的索杆和索网支承结构体系进行理论分析,在理论分析的基础上,对鱼腹式桁架(索杆体系)点支式玻璃幕墙进行了现场试验,并和理论分析结果进行了比较,表明玻璃面板对支承体系有明显的刚度贡献。在进行幕墙设计时应考虑玻璃面板对支承体系的刚度贡献。同时也验证了本文理论分析的正确性。 相似文献
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首先,建立土-输电塔-线体系的三维空间有限元模型,土、输电塔以及导(地)线分别采用实体单元、梁单元和索单元;然后,根据场地条件并依据GB 50260—96《电力设施抗震设计规范》生成支座位置的非平稳空间地震差动;最后,对该结构体系进行空间差动激励下的地震反应的时程计算。由分析结果可以看出:1)考虑土的共同作用后,与塔-线结构体系相比,土-塔-线结构体系的自振特性变化很小,说明对于这种高柔结构而言土层对结构的自振特性影响可以忽略不计。2)无论是对于塔-线结构体系,还是土-塔-线结构体系,差动因素增大输电塔的底部杆件的弯矩和剪力,这说明差动作用在工程中是需要考虑的;3)与结构自振特性分析结果不同,对于结构的动力响应而言,土-塔-线体系中塔的内力(弯矩和剪力)均比塔-线体系中塔内力大,这说明土层对地震动输入有放大作用。 相似文献
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Qing Lyu Wensheng Lu Weiqiang Wang Yue Chen 《The Structural Design of Tall and Special Buildings》2020,29(8)
The concept of shared tuned mass damper (STMD) for twin towers linked by a sky corridor using flexible joints is proposed in this paper. The analytical expressions of the transform functions and random earthquake responses of the flexibly connected structures are derived using a three‐degrees‐of‐freedom model system. The seismic reduction mechanism of the STMD is revealed using comparative analysis between the structures with STMD and those connected using a viscoelastic damper. The effect of the nondimensional parameters such as the frequency ratio of the two primary structures, mass ratio, tuning frequency ratio of the corridor, and damping ratio of the passive control devices on the structural seismic response is investigated. Optimum parametric analysis is performed using the principle of minimizing the displacements of both towers, and the optimal parameter formulas are established. Numerical analysis is conducted to verify the control effectiveness of the connected multi‐degree‐of‐freedom system subjected to the El Centro earthquake ground motion. The results show that the earthquake responses of the towers can be effectively reduced if the parameters of the flexible connecting elements are appropriately selected for a certain corridor mass. Moreover, a remarkable seismic reduction effect can be achieved if the towers have similar dynamic properties. 相似文献
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M. Moghaddasi M. CubrinovskiJ.G. Chase S. PampaninA. Carr 《Engineering Structures》2011,33(4):1338-1347
Uncertainties involved in the characterization and seismic response of soil-foundation-structure systems along with the inherent randomness of the earthquake ground motion result in very complex (and often controversial) effects of soil-foundation-structure interaction (SFSI) on the seismic response of structures. Conventionally, SFSI effects have been considered beneficial (reducing the structural response), however, recent evidence from strong earthquakes has highlighted the possibility of detrimental effects or increase in the structural response due to SFSI. This paper investigates the effects of SFSI on seismic response of structures through a robust Monte Carlo simulation using a wide range of realistic SFS systems and earthquake input motions in time-history analyses. The results from a total of 1.36 million analyses are used to rigorously quantify the SFSI effects on structural distortion and total horizontal displacement of the structure, and to identify conditions (system properties and earthquake motion characteristics) under which SFSI increases the structural response. 相似文献
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高压电气设备的抗震可靠度分析 总被引:6,自引:0,他引:6
本文研究了高压电气设备的抗震可靠度分析问题。采用具有柔性节点有限元法进行设备的地震动力反应分析 ,在此基础上利用反谱分析理论 ,建议了一类简化的抗震可靠度分析方法。通过对典型电气设备的分析 ,给出了设备在不同场地土条件和不同地震烈度下的可靠度和失效概率 ,结果表明本文建议的方法是有效和实用的 相似文献
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平台-群桩-水流-土体系统的地震反应分析 总被引:5,自引:0,他引:5
本文研究平台-群桩-水流-土体系统的地震反应分析问题,考虑了群桩与水流和地基土之间的动力相互作用,由解析法给出了系统对地震响应的分析.文末给出了具体算例并讨论了系统参数对动力特性的影响. 相似文献
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Kemal Haciefendi̇oğlu Fahri Bi̇ri̇nci̇ 《The Structural Design of Tall and Special Buildings》2011,20(6):669-678
This paper presents the stochastic seismic response analysis of masonry minarets subjected to random underground blast and earthquake‐induced ground motions by using a three‐dimensional finite element model. The random blast and earthquake‐induced ground motions are represented by the power spectral density function and applied to each support point of the three‐dimensional finite element model of the masonry minaret system. This research conducted a parametric study to estimate the effects of the blast‐induced ground motion on the stochastic response of the minaret. Therefore, the analyses were carried out for the different values of the charge weight and the distance from the charge centre. In addition, in order to investigate the effect of earthquake‐induced ground motion on the stochastic response of the masonry minaret, three different soil conditions—soft, medium and firm soils—are considered in the analyses. Finally, it is noted that underground blast and earthquake effects cause the stochastic behaviour of minaret to change considerably. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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为减小隔震结构底部柔弱层的过大变形,提出了一种底层柔性柱隔震结构半主动控制体系。将结构底层柱设计成柔性柱,在底部填充墙与二层梁之间安装磁流变阻尼器,根据主动控制算法来适时调整阻尼器的阻尼力,对结构实施限位和耗能的半主动控制。建立结构振动模型,通过数值模拟分析该体系的振动特点和减震效果。研究表明,这种结构控制体系能有效减小结构的地震反应,隔震层位移减小50%以上,防止结构因底部位移过大而倒塌。隔震层刚度对减震效果有明显影响,层间刚度比应在隔震层位移、层间位移和加速度之间权衡考虑,并保证底层柱在大震下不发生失稳。在没有半主动控制条件的情况下,在隔震层安装固定阻尼耗能器件进行被动控制,也可减小底层位移30%以上。 相似文献