Assesment of the Collapse Risk of Infill Walled Buildings

Abstract eng:
Infill walls in reinforced concrete buildings can strongly affect the strength and deformation capacity of the building when subjected to earthquake loading. Global effects include overall stiffening and strengthening of stories containing infills. Where infills fail by in-plane or out-of-plane loading, soft/weak stories can occur, leading to concentrated story drift demands. Infills can also affect structural members on a local level. Such effects include increased axial forces on columns due to overturning, concentrated shear forces at the ends of beams and columns, and localized deformations in columns surrounded by discontinuous infills. Such effects should be considered when assessing or rehabilitating an older existing concrete building with infills. In this study, we are primarily concerned with the effect of infill walls on the collapse risk of older existing concrete buildings. Analytical models are assembled in which the infill walls are modelled with macro modelling approaches. Results will be compared with the experimental results for validation of the modelling approach and then frames designed based on ACI 318 will be studied with infill walls to investigate how the story drifts and story strengths change compared to the bare frames. Effects on collapse risk will be assessed within the framework of the ongoing ATC 78 project.

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