与多层砖混结构房屋相比，内框架砖房的破坏更为严重，这是由于其空旷和横墙

Compared with the multi-storey brick-concrete structure house, the damage of the inner-frame brick house is more serious. This is due to its openness and less number of horizontal walls. But the elastic deformation limit value and ductility are much smaller than the frame column, so it bears more horizontal shear force. In the first stage of the lateral deformation of the house under the earthquake, most of the horizontal shear forces are borne by the brick wall, and the frame columns bear little seismic shear force. <br>After the earthquake caused brick wall damage, the lateral deformation of the house increased, and most of the seismic shear force will be borne by the frame. When the frame exceeds the bearing capacity of the frame, the frame will be destroyed. Such hybrid structures are destroyed one by one during the earthquake, making the inner frame The earthquake damage in the brick house has increased. However, since there are frame columns with better ductility in the inner frame brick house and the ability to adapt to larger reciprocating deformation, even if there are more local collapses, there are fewer complete collapses. When the earthquake area of ​​9 degrees and above, a large number of walls collapsed and the frame support beams collapsed. The earthquake horizontal action was mainly borne by the frame columns. Therefore, horizontal cracks appeared at the upper and lower ends of the reinforced concrete frame columns. The concrete is crumbling, collapsing and buckling, and the heavy is dumped. The reinforced concrete girders of the inner frame have vertical, slightly oblique cracks near the supports, but break when they are heavy. The damage statistics of the different intensity areas of the Tangshan earthquake are listed in the figure.

与多层砖混结构房屋相比，内框架砖房的破坏更为严重，这是由于其空旷和横墙数量较少所致，砖墙沿墙面的侧移刚度要比框架柱大许多，但是弹性变形极限值和延性又比框架柱小很多，所以其承担的水平剪力多。地震作用下房屋侧向变形的第一阶段，水平剪力大部分都由砖墙承受，框架柱承担地震剪力很少。<br>地震导致砖墙破坏之后，房屋侧向变形加大，大部分地震剪力将由框架承担，当超过框架的承担力时，框架将会破坏，这类混合结构在地震时被逐一破坏，使得内框架砖房的震害加重。但是，由于内框架砖房中有延性较好的框架柱，有适应较大往复变形的能力，所以即使局部倒塌的比较多，而彻底倒平的比较少。当 9 度及以上地震区，墙体大量倒塌，框支梁支座塌落，地震水平作用主要由框架柱来承担，因而在钢筋混凝土框架柱的上下端都出现水平裂缝，情况严重的，出现混凝土酥碎，崩落和钢筋压屈，重则倾倒。内框架的钢筋混凝土大梁在靠近支座的地方出现竖向稍斜的裂缝，重则折断。现将唐山大地震不同烈度区的震害统计列于图中。

Compared with multi-storey brick concrete structure buildings, the damage of internal frame brick buildings is more serious, which is caused by its open space and less number of transverse walls. The lateral stiffness of brick walls along the wall is much larger than that of frame columns, but the elastic deformation limit and ductility are much smaller than that of frame columns, so it bears more horizontal shear. In the first stage of lateral deformation of buildings under earthquake, most of the horizontal shear force is borne by the brick wall, while the frame column bears little seismic shear force.<br>After the brick wall is destroyed by the earthquake, the lateral deformation of the house increases, and most of the seismic shear force will be borne by the frame. When the bearing force of the frame is exceeded, the frame will be destroyed. This kind of hybrid structure will be destroyed one by one during the earthquake, which makes the seismic damage of the brick house within the frame worse. However, because there are frame columns with better ductility and the ability to adapt to larger reciprocating deformation in the inner frame brick house, even though there are more local collapse, there are less thorough flattening. In the earthquake area of 9 degree or above, a large number of walls collapse, the support of frame beam collapses, and the horizontal earthquake action is mainly borne by the frame column, so there are horizontal cracks at the upper and lower ends of the reinforced concrete frame column. In serious cases, there are concrete crumbling, collapse and steel bar bending, and in serious cases, the concrete is toppled. The reinforced concrete girder of the inner frame appears a vertical slightly inclined crack near the support, and breaks if it is heavy. Now the statistics of earthquake damage in different intensity areas of Tangshan earthquake are listed in the figure.<br>