前言多层内框架房屋是由两端砖横墙,砖外纵墙及内部钢筋混凝土梁柱框架构成的一种混合结构房屋。在海城地震以及以后的唐山地震中,这类结构表现出了一些与一般多层砖房不同的震害特点。绝大多数内框架房屋的震害是上层较重而下层及底层相对较轻。上层的破坏主要是外纵砖墙,横墙及框架柱的破坏,而梁板基本完好。纵墙的破坏有二个特点:1.纵向外墙均为沿窗口上下处的水平通缝;2.纵向外墙的端部破坏较严重,产生斜裂缝,而且有错位。在9°区横墙的破坏是严重的,最常见的典型破坏是交叉裂缝,并且有的有错动;8°区和7°区的横墙震害要轻得多,砌体的错位是少见的。从已掌握的震害资料来看,内框架房屋的纵墙 Foreword The multi-story frame house is a kind of mixed-structure house consisting of two bricks, one with a brick wall, the other with a vertical outer wall of bricks and an inner reinforced concrete beam-column frame. In the Haicheng earthquake and later in the Tangshan earthquake, these structures exhibited some of the characteristics of earthquake damage that are different from those of typical multi-story brick buildings. The vast majority of earthquake damage in the inner frame houses is the upper layer is relatively heavy while the lower layer and the bottom layer are relatively light. The destruction of the upper floors was mainly the destruction of the outer vertical brick walls, the transverse walls and the frame columns, and the beams and slabs were basically intact. The destruction of the vertical wall has two characteristics: 1. The longitudinal exterior wall is the horizontal through seam along the upper and lower part of the window; 2. The longitudinal exterior wall has serious damage to the end, resulting in oblique cracks and misplaced. In the 9° zone, the damage of the cross walls is serious. The most common typical damages are cross cracks, and some are misaligned; the cross walls in the 8° and 7° regions are much lighter, and the masonry is misplaced. rare. Judging from the earthquake damage data that has been mastered, the vertical wall of the inner frame houses