An Evaluation of Masonry Joint Shear Strength in Existing Buildings

全国各地有许多现有的未加筋的砖石建筑需要修复或加固，以经济和经济的方式延长它们的寿命。在强度评定过程中，一个重要的因素是砌体单元床缝的现有阻力，它受到床缝上方重量的力和砂浆层的滑动阻力的共同作用。本研究项目将探讨无筋砌体床缝的基本强度和变形特性。该研究将考虑垂直荷载的影响，以及单元间砂浆在模拟风或地震运动的动态循环荷载作用下的滑动变形和抗剪强度退化。

There are many existing buildings of unreinforced masonry throughout the country which are in need of repair or strengthening to extend their lives in an economical and cost-effective manner. An important factor in the strength evaluation process is the existing resistance of the bed joints of the masonry units which are being subjected to the forces of the weight above the bed joint in conjunction with the sliding resistance of the mortar layer. This research project will investigate the fundamental strength and deformation characteristics of unreinforced masonry bed joints. The study will include considerations of the influence of perpendicular loads in conjunction with the sliding deformations and degradation of shear strength of the mortar between units when subjected to dynamci cyclic loadings simulating wind or earthquake motions.