Influence of Lateral Load on the Stability of Masonry Walls

摘要提出了一项为期三年的研究计划，研究无筋砌体（URM）受压构件和无约束后张砌体（PTM）墙体的面外弯曲和压缩失稳相互作用。由于侧向荷载（最典型的是风压和地震荷载）引起的面外弯曲的存在，加剧了轴向压缩不稳定。该计划包括建造12面砖石墙，将进行轴向压缩和面外弯曲测试，以及全面的分析工作。计划进行两种类型的试验来验证和量化砌体墙体面外弯曲与轴压失稳之间的相互作用。一旦建立规定的均匀侧压力，四个砌体试件将轴向加载至屈曲破坏。第二组四面墙将用无约束肌腱进行后张，并将在具有均匀横向载荷的简支弯曲试验装置中加载至失效。最后四面墙将以与第二组相同的方式进行测试，但将采用肌腱约束装置。实验数据分析将与数值分析相结合，以定义这种相互作用的精确数学表示，实验观察结果将用于设计程序的开发。

INFLUENCE OF LATERAL LOAD ON THE STABILITY OF MASONRY WALLSprepared by: A. E. Schultz and H. K. Stolarski, University of Minnesota, MinneapolisAbstractA three-year research program is proposed for study of the interaction of out-of-plane bending and compression instability in unreinforced masonry (URM) compression members and post-tensioned masonry (PTM) walls with unrestrained tendons. Axial compression instability is exacerbated by the presence of out-of-plane bending due to lateral loads, the most typical which arise from wind pressure and seismic loading. The program includes the construction of twelve masonry walls that will be tested in axial compression and out-of-plane bending, as well as a comprehensive analytical effort. Two types of tests are planned to verify and quantify the interaction between out-of-plane bending and axial compression instability in masonry walls. Four masonry specimens comprising single-wythe walls in running bond will be loaded axially to buckling failure once a prescribed uniform lateral pressure is established. The second group of four walls will be post-tensioned with unrestrained tendons, and will be loaded to failure in a simply-supported bending test setup featuring uniform lateral load. The last four walls will be tested in the same manner as the second group, but will feature tendon restraint devices. Experimental data analysis will be coupled with numerical analysis to define an accurate mathematical representation of this interaction, and experimental observations will be used for the development of design procedures.