Prevent Progressive Collapse Performance Of Special-shaped Column Frame Structure Under Severe Earthquake

R.c special-shaped columns frame structure is the structure system that with geometric shape of the1-shaped section, T shape and cross-shaped column instead of traditional rectangular column, it is widely used in residential buildings in our country because of its structure column in the lateral wall not highlight, saving indoor floor area and other advantages. However, the current domestic and foreign research on seismic performance of RC frame mainly concentrated in a single component, for the whole structure seismic performance, especially under rare earthquake resistance performance gradually collapsed are lack of quantitative analysis, this paper started the reseach from the earthquake damage of the special-shaped columns frame structure, quantitatively analysised the damage degree and gradually collapse performance of special-shaped column structure under severe earthquake, and gived some suggestions for the special-shaped columns frame structure's engineering design.The paper's research content is a part of Anhui Province Natural Science Fund Project" Based on recover ability of special-shaped column frame structure seismic performance research",which is studying by my Master tutor(Project Number: KJ2009A015). Did a shaking table test for the special-shaped columns frame structure to simulate the One-way horizontal earthquake, which is based on the explicit dynamic analysis software LS-DYNA, and used LS-DYNA software's composite material damage theory to make a damage assessment, quantitatively analysised the gradually collapse performance of special-shaped column structure under severe earthquake, provided a scientific basis for the special-shaped column frame structure earthquake's resistance design. Around this target, the work has been done is as follows:1. With irregular8degrees area of special-shaped columns frame structure as the research object, did a shaking table test to simulate the One-way horizontal earthquake based on the explicit dynamic analysis software LS-DYNA, and used LS-DYNA software's composite material damage theory to calculate the special-shaped columns component, structure layer, and the whole structure's damage of the special-shaped columns frame structure, then the classic Park damage models are compared to verify the LS-DYNA composite material damage theory.2. Did shaking table tests of six regular8degrees area of special-shaped columns frame structures and six irregular8degrees area of special-shaped columns frame structures to simulate the One-way horizontal earthquake based on the explicit dynamic analysis software LS-DYNA, reseached the horizontal and vertical direction structure component of reinforcement ratio's influence for performance of gradually collapse under rare earthquake.3. Based on the "alternate path" design method in European gradually collapse standard, did a shaking table test for8degrees area of special-shaped columns frame structures to simulate the One-way horizontal earthquake when components of special-shaped columns were removed, calculated the whole damage of structures, quantitatively analysised the special-shaped columns frame structure's each Special-shaped structure column's influence degree to the performance of gradually collapse4. Gived design suggestions gradually collapse when the special-shaped columns frame structure is under rare earthquake.