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首页> 外文期刊>Journal of Earthquake Engineering >Seismic Rehabilitation of Substandard R.C. Buildings with Masonry Infills
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Seismic Rehabilitation of Substandard R.C. Buildings with Masonry Infills

机译：不合格R.C.的地震修复带砌体填充物的建筑物

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Seismic deformation demands are localized in areas of stiffness discontinuity, such as in the soft storys of frame structures, where disproportionate damage is often reported in post-earthquake reconnaissance. In many parts of the world, this damage pattern is mitigated using strengthening schemes that include addition of stiffness in the structure so as to limit the magnitude of drift demands. A low-cost retrofitting method is the addition of masonry infills to increase the stiffness of soft storys in low- to mid-rise reinforced concrete (R.C.) structures. This is an easily replaceable remedy in the event of damage that may prove advantageous over R.C. structural systems, owing to the lower forces imparted to the foundation in this retrofit option as compared to more thorough interventions, thereby avoiding extensively invasive retrofit operations in the foundation. Behavioral mechanisms mobilized by masonry infills in successful retrofits are shown to emulate confined masonry behavior. It is also shown that despite their brittleness, well-connected infills can successfully mitigate the occurrence of catastrophic damage by diverting damage localization from the vulnerable regions of the building. The main objective of the current paper is to present a rapid retrofit design methodology, where masonry infills are utilized for strengthening existing substandard constructions in order for their R.C. load-bearing elements to behave elastically in the event of the design earthquake. To facilitate the retrofit design, practical design charts have been derived, to link drift demand to the ratios of infills' area in plan to the total plan area in the critical floor of the structure. Performance criteria, such as target distributions of interstory drift demand, a target estimate of the fundamental period, as required by the designer, and a limit on acceptable displacement ductility in terms of demand for the retrofitted structure, are necessary design decisions that guide the proposed retrofit strategy. Application of the retrofit design through infills is demonstrated through example case studies.
机译：地震变形的需求仅限于刚度不连续的区域，例如框架结构的软层，在地震后的侦察中经常报告不成比例的破坏。在世界许多地方，可以使用包括在结构中增加刚度以限制漂移需求量的加固方案来减轻这种损坏方式。一种低成本的改造方法是添加砖石填充物，以增加中低层钢筋混凝土（R.C.）结构中软层的刚度。如果发生损坏，这是一种易于更换的补救措施，可能证明优于R.C.与更彻底的干预措施相比，由于在这种翻新方案中施加在地基上的力较小，因此结构系统可以避免在地基中进行广泛的侵入式翻新操作。砌体填充物在成功的改造中动员的行为机制被证明模仿受限的砌体行为。还显示，尽管连接点很脆，但连接良好的填充点可以通过将损坏的位置从建筑物的脆弱区域转移开来，从而成功减轻灾难性损坏的发生。本文的主要目的是提出一种快速的改造设计方法，该方法利用砖石填充物来加固现有的不合格建筑，以实现其RC。设计地震时，承重元件具有弹性。为便于进行改造设计，已得出实用的设计图，以将漂移需求与计划中填充物的面积比与结构关键楼层中总计划面积的比率联系起来。性能标准，例如层间漂移需求的目标分布，设计者要求的基本周期的目标估计以及就改造结构的需求而言对可接受的位移延展性的限制，是指导建议的必要的设计决策。改造策略。通过实例案例演示了通过填充进行改造设计的应用。

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