Experimental Study On Reinforced-Ramming Walls Of Existing Country Raw-soil Structure

Earthquake occurs in our country frequently. In vast rural areas, many residential buildings generally have low seismic performance. Rural housing collapse is the main reason for losing life and property in the previous seismic damage. At present, China still have large number of existing unfired earth structural residential buildings. In order to ensure the safety of rural residential under earthquakes, this paper put forward the reinforcement and reconstruction methods to existing unfired earth buildings by widespread investigation and experimental research.According to unfired earth structural building's investigation data which contains of building materials, construction custom, structural system, failure phenomena, seismic performance and so on, we analyzed the structure's failure characteristics and mechanism; learning the experience of the reinforced general structure, proposing the suitable reinforcing technology measures of existing unfired earth structure buildings with rammed earth wall. We designed 6 model specimens:2 of them are "一" type of rammed earth walls, of which one is reinforced and the other is not reinforced; 2 of them are "T" type of rammed earth walls, of which one is reinforced and the other is not reinforced; 2 of them are local compression specimen, of which one is reinforced and the other is not reinforced. We compare and analyze the feature of failure process, hysteresis curves, skeleton curves, the stiffness degradation curve and so on by model test of low frequency cyclic pseudo static loading, get the horizontal bearing capacity, deformation capacity, ductility performance and index. Through the vertical static load of local compression failure characteristics, comparative analysis of the effect of locally strengthened. The test results show that the bearing capacity and ductility performance are improved obviously of the walls reinforced by timber column and timber beam, and the measures that setting reasonable pad under the concentrated load can avoid the vertical straight cracks'appearing. Reinforcement method proposed in this paper have remarkable results, therefore, take reasonable and effective reinforcement technology measures can obviously improve global seismic capacity of the existing buildings and have practical significance for the improvement of the seismic performance and the use of economic security of large number existing residential building in village and town which is worth reinforcing and reforming.