The Research On The Non-linear Static Analysis Of The Bound Concrete Hollow Block Structure

As one of the most important structures, the masonry structure will continue to be widely used in our country for a long period of time according to the Chinese present conditions. And, the bound masonry structure, which was formed by setting up core columns through the concrete block wall and Constructional columns at the corners of the vertical and horizontal walls to make up a weak frame, not only its main materials– the concrete block meet the necessity of Land and energy conservation, rational utilization of industrial castoff the environmental protection, and also has a high shear bearing capacity and good deformability. At present, the bound block structure system has become a priority to be developed in the China's building materials industry and in some provinces ,the related design and construction regulations have been issued. At the same time, this system's seismic performance has increasingly become the focus of attentions.Performance-Based Seismic Design(PBSD) of the structures has been generally accepted as the development trend of the structure seismic engineering, and the non-linear analysis is the basic means to carry it. From the time being, the non-linear static analysis– the push-over analysis and response spectrum analysis combined is one of the most simple and effective ways. This approach has been adopted by a number of countries'seismic Design Code.This paper mainly focuses on the concrete hollow block structures and its seismic performance. The main research methods are the nonlinear spectrum analysis, pushover analysis and the non-linear time-history analysis. First of all, adopting the Bispec–the response spectrum analysis program, the SDOF's plastic response spectrum analysis was carried out and the Constant-ductility strength and displacement demand spectrums with ductility coefficient of from 1 to 8, the major influence factors of them was also considered. Then they are combined with the push-over analysis to be applied to a typical concrete hollow block structure. In the end, the non-linear static analysis results and non-linear time-history analysis results were compared and some conclusions were drawn.This article mainly drew the following conclusions:1.The SDOF system's hysteretic model, damping factor and the stiffness after-yielding coefficient can affect the elastic-plastic response spectrum analysis results, especially for the former two.2.The ductility factor, the epicentral distance and the site type plays very important roles in the analysis of the SDOF system's constant-ductility strength and displacement demand spectrums, and the ductility factor determines the constant-ductility strength demand spectrum and the epicentral distance affects the constant-ductility displacement demand spectrum most.3. A deformation checking computation was suggested against the concrete hollow block structures under the acting of the rarely happening earthquakes.