6 research outputs found
Design procedures of reinforced concrete framed buildings in Nepal and its impact on seismic safety
The present paper analyses the design procedure and its impact on seismic
safety of the structures. For this, a representative reinforced concrete frame building
(WDS) is designed and the results are compared with similar buildings detailed with:
i) Current Construction Practices (CCP); ii) the Nepal Building Code (NBC) and iii)
the Modified Nepal Building Code (NBC+) recommendations. The seismic
performance evaluation is done with global strength, inter-storey drift and
displacement of the structures. Likewise, the sensitivity of the structural and
geometrical parameters of the RC frame building is studied through nonlinear analysis.
The study parameters considered for parametric analysis are column size, beam size,
inter-storey height, bay length, bay width, and compressive strength of concrete. The
results show that the influence on the structural behaviour, particularly by variation in
column size and inter-storey height. Additionally, the influence of the seismic zone
factor on reinforcement demand of the structure is studied. The result shows that
structures designed for high to medium seismic hazard demands double the
reinforcement in beams compared to structures in low seismic zone
Response reduction factor of irregular RC buildings in Kathmandu valley
Most current seismic design includes the nonlinear response of a structure through a response reduction
factor (R). This allows the designer to use a linear elastic force-based approach while accounting for nonlinear behavior 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. The ductility and overstrength of representative RC buildings in Kathmandu are
investigated. Nonlinear pushover analysis was performed on structural models in order to evaluate the seismic performance
of buildings. Twelve representative engineered irregular buildings with a variety of characteristics located in the Kathmandu
valley were selected and studied. Furthermore, the effects of overstrength on the ductility factor, beam column capacity ratio
on the building ductility, and load path on the response reduction factor, are examined. Finally, the results are further analyzed
and compared with different structural parameters of the buildings