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This study addresses the issue of response reduction factor which is used in modern codes to scale down the elastic response of the structure. The level of ductility and overstrength of RC buildings in Kathmandu valley are investigated. The ductility and overstrength factors are estimated by analyzing the buildings using non-linear pushover analysi...
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The paper illustrates a probabilistic methodology for assessing the vulnerability of existing r.c. buildings with limited ductility capacity and retrofitted by means of dissipative braces. The methodology is based on the development of single component and system fragility curves before and after the retrofit. The proposed approach allows to highli...
Citations
... These types of buildings, mostly constructed out of municipal areas, tend to be beyond the control of urban building regulations and planning requirements. Cement and steel bars are the modern materials [14]. ...
Two destructive earthquakes happened on April 25 and May 12 in Nepal. These earthquakes have been ranked among the most significant ones due to their effects. The earthquakes were felt in many settlements. Nepal earthquakes caused considerable damage to buildings and to public facilities. The first damage assessment of constructions after earthquake has importance in order to prevent loss of life and property in coming earthquakes. In this study the effects of earthquakes on constructions in Nepal have been evaluated. The damages to reinforced-concrete (RC) and masonry structures after earthquake are evaluated and recommendations made in Nepal which is seismically active. The goal of this paper is to introduce major reasons for structural damages after earthquakes. The observed damages overlap with typical earthquake damages. It has been observed that the negative features of constructions have caused an increase in damage extent. The careless selection of the design and construction of structural systems has increased the damage extent.
... The current construction practices of the buildings in Nepal use light RC frames with masonry infill. With urbanization and increases in the land price, owners tended to add additional storeys to their existing buildings, without having the required provisions for additional floors in the inferior floors structure, and without any seismic concerns [8]. Due to the increase of the number of storeys and considering the large occupancy, these buildings can have associated a significant seismic risk. ...
Most of the present seismic design includes the nonlinear response of a structure through a response reduction factor (R). It allows the designer to use a linear elastic force-based approach while accounting for nonlinear behaviour and deformation limits. In fact, the response reduction factor is used in modern seismic codes to scale down the elastic response of a structure. This study focuses on estimating the actual 'R' value for engineered design/construction of reinforced concrete (RC) buildings in Kathmandu Valley. For this, the ductility and overstrength of representative RC buildings in Kathmandu are investigated. Non-linear pushover analysis was performed on structural models in order to evaluate the seismic performance of buildings. For this, twelve representative engineered designed irregular buildings of various characteristics in Kathmandu Valley were selected and studied. Furthermore, the effects of overstrength on the ductility factor, of beam column capacity ratio on the building ductility and of load path on the response reduction factor are examined. Finally, the obtained results are further analysed and compared with different structural parameters of the buildings.
