The Analysis Of Concrete Block Seismic

Masonry has a long history, towers, extensive source materials, construction technology is relatively simple, low cost housing and other characteristics, widely used in China, especially for rural construction.We investigated three key areas of building block structure damaged in Yushu earthquake and statistics the percentage of masonry structures destroyed in survey areas. Summed up the distribution of earthquake intensity and main seismic damage features of typical houses in Yushu, summary the causes of this earthquake. Yushu masonry structure with earthquake site investigation and analysis of building damage data, selecting the Yushu the most serious earthquake damaged junction town concrete block structure of a school dormitory as an example , constructing unreinforced masonry structures, block structure and the core columns to set structural columns three typical structure of masonry structures, chosen represent four different types of conditions in 12 earthquakes records, we conducted three structure model of elasticplastic seismic response analysis and calculated structure of ground motion intensity at different reaction. Through analysis and comparison, the preliminary draw the following conclusions:1. By this calculation results of example 1 compared with the actual damage,we can see good agreement between the two confirms in selection model which is reasonable calculation.2. Accordance with eight existing minimum security specification for seismic design, core columns, structural columns, reinforcement rate was 0.08%, 0.05% in masonry structure, when in the 160 gal not yet reached its limit state of cracking, but no muscle masonry structure was already closed to collapse in the 160 gal. Restoring force model from the point of view, core columns, structural columns, reinforcement rate was 0.08%, 0.05% in the masonry structure, comparing with unreinforced masonry shear strength increased by about 20%, the ductility increased by about 30%, showing better seismic performance.3. Block structure of the earthquake in addition to its dynamic properties and structure of the relevant foreign, but also with the characteristics of site soil has a close relationship. When the structure of the natural cycle and the predominant period close to the site, the seismic effect of significantly increased.