Abstract
Masonry infilled reinforced concrete frames are a structural system commonly used for low-to-mid-rise buildings. Generally, this type of structure is modelled as an open frame neglecting the strength and stiffness contribution of the masonry infilled panel. In order to describe realistic behaviour under lateral loading, this paper evaluates the seismic performance of the building by modelling the contribution of masonry as a compression strut acting diagonally in the panel. The non-linear static procedure is employed by subjecting the building to pushover loads. The performance of the building is then analysed based on the obtained capacity curve. Seismic performance is assessed in terms of building fragility which is the conditional probability of exceeding certain damage state for a given ground shaking intensity. Fragility functions eventually are expressed as series of log-normal curves of both the open and masonry infilled reinforced concrete frame. Based on this study, the infilled frame can resist a maximum load of 20.3x103kN, while the open frame is only able to withstand a maximum load of 15.2x103kN. From the fragility curve, it can be concluded that the probability of the infilled frame to reach a certain damage state is lower than that of the open frame.
Highlights
A masonry infilled wall is regarded as a non-structural component that only gives a gravitational load effect to the structure
The masonry infilled wall influences the seismic performance of the building
The capacity curve of the masonry infilled frame structure is increases compared to the open frame structure
Summary
A masonry infilled wall is regarded as a non-structural component that only gives a gravitational load effect to the structure. The incidences can bring catastrophic consequences to the people and properties For this reason, a reliable seismic performance of building has to be endorsed to guarantee the damage induced by the seismic load is within an acceptable limit. This can be achieved by a realistic analysis of structure and an appropriate quantification of damage state limit when the building is subjected to various seismic intensities In this regard, this study employs a macro model of masonry infilled wall in the form of an equivalent diagonal compression strut [3,4] to take into account its contribution to the seismic performance of the building. Based on the above approaches, the improved seismic performance associated with the masonry infilled wall contribution is quantified by comparing the performance of four-storey masonry infilled reinforced concrete frame structure with that of the open frame structure
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