一、外加圈梁和钢拉杆的作用外加圈梁和钢拉杆是多层砖房住宅抗震加固中普遍采用的一种方法,其作用主要有以下三点:第一,增强内外墙的联接,防止外墙在地震时外闪、倒塌。唐山地震时,大部分多层砖房的破坏特点,都是由于外纵墙外闪倒塌,横墙失去了纵向支撑后,很快破坏,因而使整个建筑物倒塌。第二,减小外墙沿房屋高度方向的自由长度,从而提高墙体水平面的稳定性。圈梁作为墙体在垂直方向的支点,减小外墙的振幅。第三,加强楼板本身平面内的水平刚度与抗弯刚度,减少楼板在水平方向的弯曲,增加楼板和建筑物的整体性, One, plus the role of ring beams and steel rods plus ring beams and steel rods is a commonly used method in the seismic reinforcement of multi-storey brick house, its role is mainly the following three points: First, enhance the connection of the inner and outer walls to prevent the external wall in the earthquake It flashed and collapsed. During the Tangshan earthquake, the destruction characteristics of most multi-story brick buildings were due to the collapse of the outer vertical wall. After the vertical walls had lost their longitudinal support, they soon collapsed and the entire building collapsed. Second, reduce the free length of the exterior wall along the height of the house, so as to improve the stability of the wall level. The ring beam acts as a fulcrum in the vertical direction of the wall, reducing the amplitude of the outer wall. Third, strengthen the horizontal stiffness and bending stiffness in the plane of the floor itself, reduce the bending of the floor in the horizontal direction, and increase the integrity of the floor and the building.