Study Of Performance Levels Of Concrete Block Walls Based On Performance-Based Seismic Design

Concrete blocks are widely used in project construction, at the same time the performance-based seismic design theory (PBSD) becomes a hot spot of seismic design research. It is important for concrete block walls studied with PBSD which contains a series of complex technical problems, thereupon the presented work deals with the core content of PBSD-study of performance levels of concrete block walls based on performance-based seismic design, and to carry out the following work:Firstly, according to pseudo-static tests on three different concrete block walls (walls with tie columns, walls with core columns、walls with tie columns and core columns) which are collected, the macro failure characteristics of block walls are done a comparative analysis in order to provide the basis for performance levels of macroscopic description, test data are introduced to support the quantitative division of performance levels.Secondly, after proving the truth of Ansys modeling method suggested in this paper, the three most influential factors (axial compression ratio, the ratio of height to width, filling the core rate) on the performance of block wall seismic is analyzed. Then, based on five performance levels divided by Performance-Based Seismic Design and Design Ground Motion (CECS160:2004), performance levels of concrete block walls are divided into four levels:sufficient operation, damage operation, life safety and close to collapse.Finaly, with the displacement angle, four performance levels are divided quantitatively,the high guarantee ratio of displacement angle safety characteristic value which each performance level corresponding to are suggested, macroscopic descriptiones on performance levels are carried out according to the macro failure characteristics of block walls in pseudo-static tests.The results of this research promote the application of concrete block, promote the development of PBSD,provide help for structure design and the macroscopic decision on damage degree of concrete block walls after earthquake, and have vast importance to the concrete block structures of the performance-based seismic design.