Influence of Lateral Load on the Stability of Masonry Walls

水平荷载对砌体墙稳定性的影响。E. Schultz和H. K. Stolarski，University of Minnesota，Minneapolis摘要提出了一个为期三年的研究计划，研究无筋砌体受压构件和无约束预应力砌体墙的面外弯曲和受压失稳的相互作用。 轴向压缩不稳定性由于横向载荷引起的平面外弯曲而加剧，最典型的是由风压和地震载荷引起的。 该计划包括12个砌体墙的建设，将在轴向压缩和平面外弯曲测试，以及全面的分析工作。 两种类型的测试计划验证和量化的面外弯曲和轴向压缩不稳定性之间的相互作用在砌体墙。 四个砌体试件，包括运行债券的单wythe墙将轴向加载屈曲破坏，一旦规定的均匀侧压力建立。 第二组四面墙将采用无约束钢筋束进行后张拉，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。 最后四堵墙将以与第二组相同的方式进行测试，但将采用钢筋束约束装置。 实验数据分析将与数值分析相结合，以确定这种相互作用的精确数学表示，实验观察结果将用于开发设计程序。

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.