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钢筋混凝土梁抗震可靠度校核以及强剪弱弯设计可靠性分析 总被引:6,自引:0,他引:6
对按现行结构抗震设计规范设计的钢筋混凝土梁进行受弯、受剪可靠度分析,研究了不同荷载比值(地震作用与自重荷载比值)、不同材料强度等级和不同配筋率对梁可靠度的影响。在此基础上,分析了梁“强剪弱弯”设计的可靠性。分析结果表明,按现行规范设计的钢筋混凝土梁“强剪弱弯”设计的可靠性较低,需提高剪切增强系数,来满足设计需要。在分析梁的可靠度时,采用了MonteCarlo随机模拟法。 相似文献
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周立斌 《工程抗震与加固改造》2003,(4):36-38
针对框架结构工程中常见的梁柱混凝土设计强度不相同的情况,从抗震设计的角度阐述了施工过程中节点的处理方法;强调了“强柱弱梁”、“强剪弱弯”、“强节点,强锚固”的抗震设计三原则的重要性;具体分析了框架梁柱节点混凝土施工处理方法,在工程上实际应用的理论依据。 相似文献
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合理的建筑结构体系应该是刚柔相济的。“强柱弱梁”、“强剪弱弯”等是建筑结构设计中非常重要的概念。本文就如何设计“强柱弱梁”“强剪弱弯”作简要介绍。 相似文献
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抗震结构节点设计和施工中的几个问题 总被引:1,自引:1,他引:0
在抗震结构节点设计和施工中,常遇到节点混凝土强度不足、构造配筋不符合规范要求和节点区域钢筋锚固长度不足等问题,应遵循“强剪弱弯、强柱弱梁和更强节点”的设计准则,加强节点细胞构造的详图设计并精心施工,以保证结构强度能得到充分发挥。 相似文献
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结合结构抗震的本质和抗震延性要求,介绍了钢筋混凝土框架结构在地震作用下的两种破坏机制,通过分析比较两种破坏机制,提出了"强柱弱梁""强剪弱弯"及构造措施,从而完善框架结构抗震设计。 相似文献
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研究了在地震作用下钢筋混凝土柱“强剪弱弯”设计可靠度及其对随机变量的敏感度分析方法计算了在不同的柱截面尺寸、不同的配筋率与配箍率、不同的剪切增强系数时柱“强剪弱弯”设计可靠度指标与敏感度指标。结果表明:柱“强剪弱弯”设计可靠度指标对抗剪计算模式、混凝土抗拉强度十分敏感,规范所采用的剪切增强系数难以保证“强剪弱弯”设计可靠度。因此,现行《混凝土结构设计规范》(GB50010-2002)所采用的抗剪设计公式需要进一步完善,剪切增强系数应该适当提高,同时,混凝土抗拉强度的统计参数提供要相对精确。 相似文献
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结合两栋高层住宅楼和一地下车库的建筑结构设计,介绍了其基础选型,结构布置及相应的计算分析结果。结果表明,工程在多遇地震作用下的多个抗震性能指标均满足相关规范的要求,结构能达到小震不坏,大震不倒的抗震设防目标。 相似文献
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Mahmood Yahyai Bahram Rezayibana Amir Saedi Daryan 《The Structural Design of Tall and Special Buildings》2009,18(8):877-890
Milad Tower is a 436‐m‐tall telecommunications tower ranked as the fourth tallest structure of its kind in the world. The study of its seismic behaviour is of great importance as it is located in a highly seismic‐prone region. Because of the existence of the world's largest revolving restaurant in the head structure, and also because of the highly sensitive communication devices such as TV and telecommunications antennas installed on the tower, nonlinear deformation under future earthquakes should be studied. In this paper, a detailed finite element model is developed and nonlinear dynamic analysis was carried out under the design earthquakes. The foundation, concrete shaft, head structure and 120‐m antenna structure were modelled. Three components of the earthquakes are considered, and the selected earthquakes were normalized based on three design levels: design basis level, maximum design level and maximum credible level. The results of the analysis showed that all parts of the tower behave in the plastic zone except the elements of the head structure. It is also observed that in some cases, the earthquakes with lower peak accelerations and higher energy contents may have more severe effect on the tower than that with higher peak accelerations. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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为了研究预制预应力混凝土装配整体式框架结构(世构体系)抗震性能,以某实际工程世构体系框架结构为原型,对其底部两层进行缩尺模型振动台试验研究。观察试验模型在不同振动工况下的损伤及破坏情况,对模型在各水准地震作用下的动力特性、加速度、位移、应变及扭转反应进行分析,并根据试验现象与试验结果,对世构体系框架整体进行抗震性能的综合评价。结果表明:该预制装配框架体系在多遇地震作用下未出现明显损伤,在罕遇地震作用下节点核心区未出现裂缝,模型仍能保持较好的整体性,抗震性能良好;试验模型结构布置合理,地震作用下主要运动形式为平动;罕遇地震作用下,模型自振频率最大降幅为21.89%,最大层间位移角为1/122;虽然模型存在一定程度的损伤,但其弹塑性层间位移角均小于GB 50011—2010《建筑抗震设计规范》中的限值,满足我国“小震不坏”、“大震不倒”的抗震设防目标。 相似文献
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以北京市既有农村住宅广泛采用的单层砖木结构房屋为研究对象,通过加固前后2个大比例尺模型的振动台试验,研究抗震加固方法的有效性。试验结果表明:未加固房屋由于前后纵墙抗侧刚度相差大,纵向地震作用下前纵墙侧移大,砖柱损伤严重;山墙平面外变形大,形成贯穿的斜向裂缝;8度小震作用下墙体开裂,中震作用下墙体损伤严重,大震作用下模型结构濒于倒塌。根据试验结果,提出了抗震加固方法,包括加设钢门窗框及钢板圈梁,采用钢筋网砂浆面层加固山墙和砖柱。振动台试验表明,上述加固方法显著提高了此类砖木结构房屋的抗震能力,加固后结构达到“小震不坏、中震可修、大震不倒”的抗震设防目标。 相似文献
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以某结构设计为例,采用基于性能要求的抗震设计方法,提出合理的抗震性能目标、性能水准及实现性能设计的主要方法,对结构进行多遇地震、设防地震及罕遇地震作用下的计算分析,结果表明在不同地震动水准下结构不同部位的水平和竖向构件承载力及变形状态达到了设定的性能目标要求,验证了方案的合理性。 相似文献
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《Construction and Building Materials》2006,20(4):209-219
The Northridge earthquake (near Los Angeles, CA, USA, January 17, 1994) and the Tecomán–Colima earthquake (near Manzanillo, México, January 21, 2003) have increased our knowledge of the behavior of masonry buildings in significant earthquakes, and also have led to changes or proposals for changes in US masonry design provisions. In this paper, the masonry code-development process in the US is briefly reviewed, with emphasis on the fundamental role of the Masonry Standards Joint Committee (MSJC). The Northridge and Tecomán–Colima earthquakes are discussed, with emphasis on the behavior of modern engineered masonry. Lessons learned from those earthquakes with regard to masonry are summarized, and the related evolution of MSJC design provisions for the US is discussed. 相似文献
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This study focuses on the optimal seismic design of buildings for the limited planning time horizon considering earthquakes generated from Poisson and non-Poisson processes. The analyses of the optimal design incorporate possible effects of the time elapsed since the last major earthquake, extended service period above the planning period and costs due to partial damage and collapse. An analysis algorithm is developed based on simulation technique, considering detailed seismic information; the evaluation of the linear/non-linear responses and different structural damage levels; and the assessment of the statistics of the damage cost. The algorithm is implemented and applied to simplified steel frame structures located in western Canada.Analysis results suggest that the optimal seismic design level is sensitive to the assumption of the cost of non-structural components. The analysis results also indicate that if the seismic hazard is dominated by earthquakes generated from a Poisson process, the impact of the extended service period after the planning period on the optimal design is not very significant. The impact of the elapsed time since the last major earthquake can be significant resulting in time-dependent optimal seismic design coefficients, if the seismic hazard is dominated by earthquakes generated from a non-Poisson process. 相似文献