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《世界地震工程》2015,(2)
墙-框柔性连接可减小墙-框相互作用,减轻填充墙破损程度,其相关研究具有重要的理论和工程意义。针对砌体填充墙框架结构有限元建模问题,本着简单高效的原则,提出了一种考虑墙-框连接方式的有限元建模方法:采用平面应力单元模拟填充墙,非线性弹簧单元模拟填充墙与框架梁、柱的连接。在粉煤灰空心砌块砌体填充墙框架结构水平往复荷载试验的基础上,分别进行了刚性连接和柔性连接填充墙框架结构水平往复荷载作用下的有限元分析。计算结果表明:利用有限元建模方法计算得到的滞回曲线和试验滞回曲线吻合较好,能够有效模拟填充墙开裂及破坏过程,反应不同连接方案时墙-框相互作用的特点,为砌体填充墙框架结构提供了一种新的建模思路。 相似文献
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砌体填充墙钢筋混凝土(reinforced concrete, RC)框架结构在强地震作用下容易损伤破坏,我国规范建议填充墙与框架之间采用彼此脱开或柔性连接做法,但这也增加了填充墙平面外倒塌的风险。基于此对一种新型柔性连接开洞砌体填充墙RC框架结构进行了平面外的拟静力试验研究,分析了其失效过程、受力特征和破坏模式。结果表明：砌体填充墙RC框架结构平面外承载能力主要依靠于拱承载机制,槽钢轨道可以有效提高框架对填充墙两侧的约束作用,防止填充墙与框架之间的相对滑动,有利于水平拱承载机制的形成。对比普通柔性连接开洞砌体填充墙RC框架结构,采用新型柔性连接的开洞砌体填充墙RC框架结构,平面外的峰值承载力和峰值承载力处割线刚度分别提高了44.14%和9.70%;新型柔性连接开洞砌体填充墙RC框架结构在峰值承载力状态下和极限承载力状态下,其罕遇地震作用加速度相比于普通柔性连接开洞砌体填充墙RC框架结构分别提高了81.03%和77.36%。因此,采用新型柔性连接构造可有效提高开洞砌体填充墙RC框架结构的承载能力,改善开洞砌体填充墙RC框架结构平面外的稳定性,从而提高开洞砌体填充墙RC框架结构平面外的抗... 相似文献
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《世界地震工程》2015,(3)
针对当前砌体填充墙框架结构数值模拟中缺乏简单有效的填充墙建模方法,缺少对填充墙-框架刚性连接和柔性连接的考虑等问题,提出了基于等效弹簧单元的填充墙框架结构有限元分析方法。首先,将填充墙框架结构拆分成空框架和等效约束填充墙,其中等效约束填充墙综合考虑了填充墙对框架柱的侧向约束,以及主体框架对填充墙的闭合约束;其次,在粉煤灰空心砌块墙体及砌体填充墙框架结构水平往复荷载试验的基础上,分析了墙-框刚性连接与柔性连接情况下等效约束填充墙的力学性能,提出了填充墙的滞回曲线模型及等效弹簧有限元分析模型;最后,分别进行了刚性连接和柔性连接填充墙框架结构水平单调荷载作用下的有限元试验拟合。计算结果表明:等效弹簧单元能够有效模拟等效约束填充墙的工作,且建模方式简便易行,特别适用于砌体填充墙框架整体结构的数值模拟分析。 相似文献
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历史震害表明,填充墙与框架的连接刚度对框架结构的抗震性能有重要影响。我国《建筑抗震设计规范》(2010)建议"框架结构中的砌体填充墙,宜与柱脱开或采用柔性连接",但对二者的具体连接刚度,规范并没有做出明确规定。运用ABAQUS软件,对前人开展的考虑填充墙与框架连接影响的框架结构拟静力试验进行数值模拟,对比分析填充墙框架结构破坏特征及滞回曲线等抗震性能指标,验证了有限元模型的可靠性。基于某典型框架结构,建立不考虑填充墙、考虑填充墙与框架不同连接刚度的框架结构有限元模型。模态分析表明,连接刚度对框架结构的频率影响较小,结构的动力特性趋于一致;多遇地震和罕遇地震作用下的弹塑性时程分析表明,合适的连接刚度可以提高结构的抗震性能。研究可为框架结构的抗震设计提供参考。 相似文献
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大量震害表明,在强震作用下传统填充墙框架结构的填充墙与框架之间相互作用非常复杂,破坏严重。为改善填充墙框架结构的抗震性能,本文采用适应我国墙材革新所倡导的蒸压加气混凝土砌块作为墙体材料,利用玄武岩纤维格栅(BFG)替代钢筋作为填充墙墙体内的拉结材料,设计了两种不同的填充墙与框架的柔性连接方式,对填充墙框架进行了拟静力试验研究。分析了其破坏特征、滞回曲线特性、骨架曲线、墙体延性、强度衰减、刚度退化以及累积耗能。结果表明,在水平荷载作用下,采用柔性连接方式的填充墙对框架承载能力影响不大,不会因框架在平面内发生较大位移而导致墙体严重破坏,且采用本文提出的平板连接方式的填充墙对框架抗侧刚度几乎没有影响,其破坏模式更为合理;同时,墙体内配置的玄武岩纤维格栅延缓了墙体的开裂,对墙体变形构成有效约束。 相似文献
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为了减轻填充墙与框架在地震中的不利相互作用,提出一种采用滑楔连接件的柔性填充墙框架结构设计方案.采用ABAQUS建立滑楔连接框填结构有限元模型,与满砌填充墙在平面内滞回性能、平面内外耦合性能、墙框局部损伤及填充墙整体损伤等方面进行了对比分析.模拟结果表明,和满砌填充墙相比,采用滑楔连接减轻了填充墙与框架平面内相互作用产... 相似文献
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为了适应国家绿色建筑和装配式建筑的发展，减少地震中填充墙的平面外破坏，采用ABAQUS有限元程序研究了装配式AAC砌体填充墙的平面外抗震性能。进行了不同工况下足尺有限元模型的模拟，分析了填充墙高厚比、配筋率及填充墙与框架间连接方式对其平面外抗震性能的影响，以峰值、极限状态下的荷载与跨中位移评定其平面外抗震性能。分析结果表明:采用ABAQUS进行填充墙平面外抗震性能数值模拟与试验结果吻合较好；填充墙高厚比越小，平面外承载力越大，当高厚比小于10时，墙体延性大幅下降；填充墙配筋率和承载力近似呈正比关系，但当配筋率大于0.2%时，墙体延性也会下降；高厚比在15~20和配筋率在0.1%~0.2%范围内，填充墙呈适筋延性破坏模式；填充墙与框架之间布置双向柔性连接约束，墙体具备一定延性，墙体平面外承载力较单向连接件布置有所提升。 相似文献
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空心砖砌体填充墙框架结构是我国现阶段应用广泛的建筑结构形式之一。2008年四川汶川地震和2013年四川芦山地震中,不同地震烈度区均有大量填充墙框架结构发生不同程度的震害。基于广泛且深入的现场调研,系统介绍了空心砖填充墙的震害特征,并探讨了其震害原因。研究发现,空心砖砌体填充墙在地震中极易发生破坏,即使在地震烈度相当于或低于设防烈度的地区,空心砖砌体填充墙的震害亦非常普遍。空心砖砌体强度低、门窗洞口或墙内管线对填充墙的削弱、以及楼梯间形成的抗震薄弱部位等都是造成空心砖填充墙极易发生震害的原因。现行规范所规定的拉结筋、构造柱和水平系梁等抗震构造措施,对防止地震中填充墙整体平面外坍塌有一定的贡献,但不能有效改善填充墙自身平面内的拉压承载能力。空心砖填充墙发生严重破坏时,框架梁柱可能仍完好无损。建议抗震设防类别为甲类、乙类和装修标准很高的丙类建筑,不宜采用空心砖砌体填充墙。 相似文献
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为研究填充墙对底层框架多层砌体房屋地震反应的影响,以典型的填充墙-底层框架多层砌体房屋为基础,建立有限元计算模型并进行了弹塑性动力时程分析。根据不同模型的计算结果以及填充墙的刚度和强度,分析了填充墙对底层框架多层砌体房屋自振周期、地震作用下房屋整体变形、底层框架的损伤以及填充墙与底层框架相互作用的影响。计算结果表明：填充墙对房屋整体地震反应产生明显影响,其影响不能忽略。在上部砌体结构质量和刚度不变的情况下,结构自振周期随着填充墙刚度的增加而降低;随着填充墙与底层框架之间连接作用的增强,结构整体的变形减小,底层框架的损伤增大。当填充墙与底层框架之间采用弱连接时,采用强度较高的填充墙可以提高结构整体的变形能力,从而提高结构整体的抗震能力。 相似文献
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Hemchandra Chaulagain Hugo Rodrigues Enrico Spacone Humberto Varum 《地震工程与工程振动(英文版)》2016,15(2):251-268
Reinforced concrete (RC) buildings in Nepal are constructed with RC frames and masonry infill panels. These structures exhibit a highly non-linear inelastic behavior resulting from the interaction between the panels and frames. This paper presents an extensive case study of existing RC buildings in Nepal. Non-linear analyses were performed on structural models of the buildings considered as a bare frame and with masonry infill, in order to evaluate the influence of infill walls on the failure mechanisms. Five three-storey buildings with different structural configurations and detailing were selected. The effect of masonry infill panels on structural response was delineated by comparing the bare-framed response with the infill response. Seismic performance is evaluated with regard to global strength, stiffness, energy dissipation, inter-storey drift, and total deflection of the structure. A parametric analysis of structures with masonry infill is also performed. For this, the influence of different material properties is studied, namely diagonal compressive stress, modulus of elasticity and tensile stress of masonry infill panels. Study results show that masonry infill increases the global strength and stiffness of the structures; it decreases the inter-storey drift and hence the total displacement of the structure. The results quantify the influence of the infill panels on structural response and, in particular, the effect of the diagonal compressive strength of the masonry wall. 相似文献
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Romeu Silva Vicente Hugo Rodrigues Humberto Varum Aníbal Costa Jos António Raimundo Mendes da Silva 《地震工程与工程振动(英文版)》2012,11(1):23-34
This paper discusses the issue of performance requirements and construction criteria for masonry enclosure and infill walls.Vertical building enclosures in European countries are very often constituted by non-load-bearing masonry walls, using horizontally perforated clay bricks.These walls are generally supported and confined by a reinforced concrete frame structure of columns and beams/slabs.Since these walls are commonly considered to be nonstructural elements and their influence on the structural response is ignored,their consideration in the design of structures as well as their connection to the adjacent structural elements is frequently negligent or insufficiently detailed.As a consequence,nonstructural elements,as for wall enclosures,are relatively sensitive to drift and acceleration demands when buildings are subjected to seismic actions. Many international standards and technical documents stress the need for design acceptability criteria for nonstructural elements,however they do not specifically indicate how to prevent collapse and severe cracking,and how to enhance the overall stability in the case of moderate to high seismic loading.Furthermore,a review of appropriate measures to improve enclosure wall performance and both in-plane and out-of-plane integrity under seismic actions is addressed. 相似文献
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This paper proposes a new analytical model for masonry‐infilled R/C frames to evaluate the seismic performance considering R/C frame–infill interactions. The proposed analytical model replaces masonry infill with a diagonal compression strut, which represents distributed compression transferred between frame and infill interfaces. The equivalent strut width is presented as a function of the frame–infill contact length, which can be evaluated by static equilibriums related to compression balance and lateral displacement compatibility at the frame–infill interfaces. The proposed analytical model was verified through comparisons with experimental results obtained for several brick masonry‐infilled R/C frames representing a typical R/C building with nonstructural masonry infill in Indonesia. As a result, good agreements were observed between the experimental and analytical values of the lateral strength and ductility of the infilled frames. The seismic performances of two earthquake‐damaged R/C buildings with different damage conditions were evaluated considering infill effects by applying the proposed analytical model. Consequently, the nonstructural brick masonry infill significantly affected the seismic resistances of the buildings, which seemed to lead to differing levels of damage for each building. These results indicate that the proposed analytical model can be an effective tool for more precisely screening earthquake‐vulnerable existing R/C buildings in Indonesia. Copyright © 2016 The Authors. Earthquake Engineering & Structural Dynamics Published by John Wiley & Sons Ltd. 相似文献
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针对我国村镇地区仍广泛存在生土结构房屋，且其结构整体性及抗震性能较差的现状，提出一种可有效提高其抗震性能、具有施工便捷性和装配属性的新型钢节点木构架-生土墙结构形式。进行了新型钢节点木构架-生土墙与农房中常见的素生土墙、上土坯下砖砌体混砌墙、传统榫接木构架-生土墙的拟静力对比试验，比较了4个墙体试件的破坏形态、滞回曲线和骨架曲线特征，以及延性系数、耗能能力、极限层间位移角等抗震性能指标。研究表明:素生土墙和上土坯下砖砌体混砌墙抗震性能较差，木构架的约束作用可有效提升生土墙的抗剪承载力和延性，新型钢节点连接的木构架-生土墙抗震性能优于榫接形式，具备一定的推广应用价值。 相似文献
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为研究整体开洞墙体中发生底层窗间墙破坏模式时墙体的抗震性能，对一砌体结构缩尺开洞墙体模型展开多点同步加载拟静力试验。分析了各层墙体与整片墙的破坏特征、承载与变形能力、滞回耗能特性、刚度退化规律及延性表现，重点研究了底层窗间墙位于整体结构中时其破坏过程与变形规律。试验结果表明:破坏模式相同的开洞墙体较单独墙肢抗震性能有所不同，各工况加载峰值点的上升与下降过程更为缓慢、滞回曲线更为饱满、刚度退化过程更为缓和以及延性特征更为明显。基于底层窗间墙破坏模式，依据现行规范中开洞墙体承载力计算方法所得结果与试验结果吻合，但强弱构件失效机制无从体现。试验结果可为探求砌体结构合理设计方法与实现开洞墙体延性破坏模式提供依据。 相似文献
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In this paper, a contribution of various types of masonry infill to the behaviour of reinforced concrete frames under lateral loads is presented. As a part of the bigger project, ten one‐bay, one‐storey reinforced concrete frames were designed according to the EC8, built in a scale 1:2.5, infilled with masonry and tested under constant vertical and cyclic lateral load. The masonry wall had various strength properties, namely, high strength hollow clay brick blocks, medium strength hollow clay brick blocks and low strength lightweight autoclaved aerated concrete blocks. There were no additional shear connectors between the masonry and frame. The results showed that the composite ‘framed wall’ structure had much higher stiffness, damping and initial strength than the bare frame structure. Masonry infill filled in the load capacity gap from very low (0.05%) to drifts when the frame took over (0.75%). The structures behaved as linear monolithic elements to drifts of 0.1%, reached the maximum lateral capacities at drift of 0.3%, maintained it to drifts of 0.75% and after that their behaviour depended on the frame. Masonry infill had severe damage at drift levels of about 0.75% but contributed to the overall system resistance to drifts of about 1%. At that drift level, the frame had only minor damage and was tested to drifts of about 2% without any loss of capacity. Improvement of the ‘infill provisions’ in the codes could be sought by taking into account the contribution of a common masonry that reduces expected damages by lowering the drift levels. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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Federico Margiacchi Luca Salvatori Maurizio Orlando Mario De Stefano Paolo Spinelli 《Bulletin of Earthquake Engineering》2016,14(12):3529-3546
Effects of masonry infills on the seismic vulnerability of steel frames is studied through multi-scale numerical modelling. First, a micro-modelling approach is utilized to define a homogenized masonry material, calibrated on experimental tests, which is used for modelling the nonlinear response of a one-story, single span, masonry-infilled portal under horizontal loads. Based on results of the micro-model, the constitutive behavior of a diagonal strut macro-element equivalent to the infill panel is calibrated. Then, the diagonal strut is used to model infill panels in the macro-scale analysis of a multi-span multi-story infilled moment-resisting (MR) steel frame. The seismic vulnerability of the MR frame is evaluated through a nonlinear static procedure. Numerical analyses highlight that infills may radically modify the seismic response and the failure mechanism of the frame, hence the importance of the infill correct modelling. 相似文献