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The structural behaviour of low - rise residential building due to wind and seismic loads

By Anuciano Domingos Pinto Guterres


Buildings are subjected to natural hazards such as wind and seismic, and when subjected too, will have an effect on the overall behaviour of the structure. This study describes the effect of wind and seismic loads towards the structural behaviour of low rise residential building in Timur Leste. Various bracing system design were proposed to the building and analytical results were recorded and observed. Wind data velocity (V) was taken at 33 m/s in open country. The data was collected at location for wind and seismic on high intensities for a 20 year cycle. For the simplicity of illustrating the design, the study focuses on the analysis of a two and three dimensional three bay fourstorey moment resisting frames on rigid foundation. Lateral wind load was determined in accordance to BS CP3 Chapter V part 2 1972 standard. Seismic deign load on building was obtained at Peak Ground Acceleration (PGA) for low, medium and high ground motion on building in accordance with UBS 1997. The analysis of the building was conducted using STAAD Pro 2004 to identify critical members and elements of the low rise building under shear, displacement and moments due to wind and seismic loading. In applying wind and seismic load from side and front of building, large values of displacement, shear and moment was observed at critical points of the structure. By providing bracing system types V and X to the structure, less displacement with lower shear and moment values for the building component was achieved. Result shows that for structures with suitable bracing system, an overall reduction of about 70% in displacement; 50% in moment and 33.5% in shear was observed. This implies that by applying the bracing system, the rigidity and stability of the structure has increased and the risk of collapse has substantially reduced

Topics: TH Building construction
Year: 2008
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