Earthquake Resistant Design (Seismic Analysis)
Buildings response to earthquakes is a dynamic phenomenon, but structures are mainly designed to resist static loads. The method of neglecting the dynamic forces becomes the cause of disaster during a seismic event. The recent Nepal earthquake occurred in July 2015 has created a need and mandatory implementation of Earthquake resistant design for buildings.
Conventional engineering of buildings are designed on the basis of strength and stiffness of columns and beams. But in case of a seismic event, ductility of the structure is more important. Ductility is an ability of the structure to resist strong ground motions by undergoing deformation without damage or failure which results in dissipation of energy.
FE – Response spectrum Analysis allows every Civil engineer to consider various parameters of failures such as Column sway mechanism, Shear mode of failure etc. and provide efficient design changes and damping to mitigate the vulnerability of the structure during an earthquake. To acquire more knowledge, Approach a well known company who have expertise in providing Stress Analysis Services and Structural Analysis Services.
Effect of wind load on buildings
Accurately designing a building for the Wind loads sustained during its service life is a tedious work. As modern buildings are taller and slenderness increases with height. Due to the which, buildings suffer from flexibility, which has negative effects in wind loading. Through CAE different methodologies are possible to control wind induced motion in Super-high structures.
Motion of Sky scrapers occurs primarily in three modes of action –
Along Wind – Under the influence of air, the building experiences Aerodynamic load such as drag, the structural response caused by drag is called Along Wind Response.
Across Wind motion – This occurs when the motion in plane is perpendicular to wind direction. Buildings are highly susceptible to across wind motion perhaps more apparent as wind speed increases.
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Torsional motion – tall structures are bluff, which causes to flow to separate from the surface of the building. During higher wind speeds vortices are shed alternatively causing an impulse both in along and across wind directions. If the Natural frequency of the building coincides with the frequencies of the vortices, large amplitude displacement may occur and this causes very large oscillations and possibly failure.
