Compared with the multi-storey bric

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.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.