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Seismic Performance Of Gravity Load Designed Reinforced Concrete Frames With Unreinforced Masonry Infill Walls

机译：重力荷载设计的无钢筋砌体填充墙的钢筋混凝土框架的抗震性能

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A significant portion of the existing building stock constructed prior to the enactment ofmodern seismic design provisions consists of Gravity-Load-Designed Reinforced Concrete(GLDRC) frames and unreinforced masonry infill walls which were used as partition wallsin those buildings.Common construction practice before modern seismic design codes appeared, allowed theuse of columns lap splices above the slab in each floor or above the foundation. The spliceswere typically 20 to 24 longitudinal bar diameters in length. Shear reinforcement was in theform of stirrups with 90-degree bends and spaced at half the depth of the frame member. Asa result, the section at the base of these columns is unconfined and susceptible to shear failureor to a premature failure of the lap splices before yielding of the longitudinal bars, underreversed cyclic loadings in the event of an earthquake.The masonry infill walls used as partitions were often ignored by design engineers since suchwalls were considered as non resistant architectural elements. However, lessons learned frompast earthquakes and from several tests performed have shown that those walls tend tointeract with the bounding frame when the structural system is subjected to moderate orsevere earthquake ground motions and that such interaction may not be beneficial to theperformance of the structure.This paper presents the results of a series of tests, one monotonic and several shake tabletests, conducted on two similar 1/2 scale gravity-load-designed reinforced concrete framescontaining an unreinforced masonry infill wall built using hollow concrete blocks. Onespecimen was subjected to a static monotonic lateral loading and the other to prescribedsimulated ground motions at different intensities to identify the interaction between thereinforced concrete frame and the masonry infill wall, the degradation in stiffness, and failuremechanism. The tests were conducted at the Earthquake Engineering Research Facility at theUniversity of British Columbia in Vancouver, Canada.
机译：颁布之前建造的现有建筑存量的很大一部分 现代抗震设计规定包括重力荷载设计的钢筋混凝土 （GLDRC）框架和未加固的砖石填充墙（用作分隔墙） 在那些建筑物中。 在现代抗震设计规范出现之前的常见施工实践允许 在每层楼板上方或地基上方使用圆柱搭接。接头 长度通常为20至24个纵向钢筋直径。剪力是在 形式的马s，具有90度的弯曲度，且间隔为框架构件深度的一半。作为 结果，这些列底部的部分是无限制的，容易发生剪切破坏 或在纵向钢筋屈服之前，搭接接头过早失效 发生地震时，反向循环荷载。 设计工程师经常忽略用作隔断的砖石填充墙，因为这样 墙壁被认为是非抵抗性的建筑元素。但是，从中汲取的教训 过去的地震以及进行的几次测试表明，这些墙壁往往会 当结构系统受到中等或中等的作用时，它与边界框架相互作用 剧烈的地震地面运动，并且这种相互作用可能不利于 结构的性能。 本文介绍了一系列测试的结果，一个单调和几个振动台 测试在两个类似的1/2比例重力设计的钢筋混凝土框架上进行 包含使用空心混凝土砌块建造的未加固砌体填充墙。一 试样承受静态单调的横向载荷，另一个承受规定的载荷 模拟不同强度的地面运动，以识别地面之间的相互作用 钢筋混凝土框架和砌体填充墙，刚度下降和破坏 机制。这些测试是在 加拿大温哥华不列颠哥伦比亚大学。

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