Seismic Response Analysis Of A Two-Story Hybrid Subframe-Shear Wall Masonry Structrure

Data from building appraisal, modification and strengthening show that hybrid subframe-shear wall structures—structures with partial one-story subframe and partial two-story subframe supporting masonry structure (in this paper, it is named TWO-STORY HYBRID SUBFRAME-SHEAR WALL MASONRY STRUCTRURE in short)—exist universally in some area in Sichuan province. These 70s~80s built structures are apparently off the code limits. Until most recently, study on subframe structures are focused on the uniform one-story or two-story supporting frame, with hybrid subframe scarcely involved. However, social and technique advancing draw people's attention dramatically to this kind of building these years and therefore demand further research. In this paper, we applied general FEM package ANSYS to the dynamical analysis of one real two-story hybrid subframe supporting masonry structure, for which we input different sets of parameters before conducting spectrum and elastic time-series analysis, whose results lead us to the weak spot of the structure and practical model and computing methods. At the end of the program, we made following conclusion:1. Elastic plate model is proper for the deformation computing in earthquake analysis.2. Result in comparison shows that elastic time-series analysis is applicable for the deformation and force computation of hybrid subframe structure. 3. Influence on the structure due to different damping ratio (concrete or masonry) is difference, it is greater in X direction than in Y direction, and maximum difference of both the results are close to the engineering precision requirement. Considering the research insufficiency on this type of structure, we recommend the lower damping ratio,ξ=0.035, for the deformation and force computing in the earthquake engineering analysis.