Seismic damage investigation and analysis of buildings in Ms6.8 Luding earthquake
The seismic damage investigation and analysis were performed on buildings in Moxi Town and Detuo Town in the meizoseismal area of the Ms6.8 Luding earthquake in Sichuan.Buildings with the characteristics of looseness,brittleness,and eccentricity were seriously damaged,while buildings with confined masonry structure and"even"structural layout have performed surprisingly well.Based on deformation saturation theory and the damage of Luding earthquake,the structural layouts of common buildings were divided into five forms:structure with full hard-brittle axis,structure with full weak-brittle axis,structure with full weak-ductility axis,structure with hard-brittle axis and weak-ductility axis(either uneven or even),and the corresponding seismic damage performance and internal mechanism of each form were analyzed.The results indicated that the structure with full hard-brittle axis,the structure with full weak-brittle axis and the even structure with hard-brittle axis and weak-ductility axis had not reached the deformation saturation,so the seismic damage was extremely light,with almost no visible cracks,while the buildings with other structural layouts were damaged or even collapsed.Finally,it is suggested that the seismic design of structures should have the concept of"even"by using deformation saturation theory.
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