Seismic Performance Analysis And Design Of Reinforced Concrete Infilled Frame Structure

Reinforced concrete infilled frame structure is convenient to design and construct and flexible to arrange spatially, therefore in China it is widely used in office, commercial and residential buildings. In Wenchuan earthquake, infilled frame structure severely injured, especially there are cracks, collapse damage or other damages in infilled walls. In fact, present study often considers the infilled walls as non-structural components, and in Chinese norm the basic period of infilled frame structure is multiplied by the reduction factor of 0.6 to 0.7 to take into account the impact of infilled wall, in essence, it is still calculated in accordance with pure frame structure, so this method is not reasonable. Based on various typical damages in Wenchuan earthquake, the thesis analyses the seismic performance of infilled frame structure and proposes reasonable methods of seismic performance evaluation. The main research contents and results are as follows:A simulation model corresponds to a reinforced concrete infilled frame structure which is damaged in Wenchuan earthquake is established with usual soft ABAQUS, and the dynamic elastic-plastic analysis of the structure is executed. The comparson with the damage phenomenon of the actual structure from the most displacement, story drift is executed, equivalent plastic strain and the cracks of infilled wall, then the reasonability of the model parameters and the modeling approach is verificated.For various typical damages of the infilled frame structure in Wenchuan earthquake, influence of vertical layout of infilled wall, the floor number, the hole rate of infilled wall and the structural measure on seismic performance is analysed. The conclusions are as follows, it is not beneficial for the infilled frame when the infilled walls are not evently distributed. It is easy to peresent the short column damage caused by large hole of infilled walls. The deformation curve of high infilled frame structure emerges the characteristic of shear-flexural type. Reasonable strutural measure can avoid large cracks. State goals with quantitative index of story drift are proposed for the main frame and the infilled wall respectively. It is achievable to evaluate the struture performance level based on capacity spectrum method. At last, the reasonability to reduce the period of the infilled frame accordance with the Chinese norm is verificated.