Abstract
The unsymmetrical configurations in buildings lead to non-uniform distributions in their strength, mass, and stiffness, and they are consequently prone to damage during seismic hazards. In this study, the seismic performance of multi-story buildings with 5, 8, 10, and 12 stories of square, ‘L’, ‘T’, and ‘U’-shaped buildings have been investigated. The research deals with the variation of the natural time periods and how it affects the seismic performance of unsymmetrical multi-story buildings. The coupled and uncoupled equations of motion, based on the symmetricity of the buildings about both axes, were solved to obtain natural time periods that influence the spectral acceleration of the ground accelerations. Six important ground accelerations were considered. Nonlinear static analysis, such as pushover analysis, was also carried out on all the buildings. Comparisons were made on the seismic behavior of both the symmetrical and unsymmetrical structures. The results revealed that the spectral acceleration influences dynamic responses, such as base shear, base moment, base torsion, roof displacement, roof rotation, and story drifts of the buildings. Moreover, it was found that even though the ‘L’-shaped buildings are unsymmetrical about both axes, they are less vulnerable than the ‘T’ and ‘U’-shaped buildings, which are unsymmetrical about one axis.
Article Highlights
Due to non-uniform strength, mass, and stiffness distributions, unsymmetrical building configurations amplify seismic vulnerability.
Study investigates impact of natural time period variations on seismic performance of 5, 8, 10, and 12-story square, ‘L’, ‘T’, and ‘U’-shaped buildings.
Findings show that ‘L’-shaped buildings, despite being unsymmetrical, have lower seismic vulnerability than ‘T’ and ‘U’-shaped buildings.
Unequal strength distribution increases roof displacement under seismic loading.
Varied stiffnesses across structures intensify inter-story drift during earthquakes.
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Details
1 St. Xavier’s Catholic College of Engineering, Department of Civil Engineering, Nagercoil, India
2 Universidad Tecnológica Metropolitana, Departamento de Ciencias de La Construcción, Facultad de Ciencias de La Construcción Ordenamiento Territorial, Santiago, Chile (GRID:grid.441835.f) (ISNI:0000 0001 1519 7844)
3 University of Gävle, Department of Building Engineering, Energy Systems and Sustainability Science, Faculty of Engineering and Sustainable Development, Gävle, Sweden (GRID:grid.69292.36) (ISNI:0000 0001 1017 0589)
4 Universidad César Vallejo, Department of Civil Engineering, Lima, Peru (GRID:grid.441978.7) (ISNI:0000 0004 0396 3283)
5 Prince Mohammad Bin Fahd University, Department of Civil Engineering, Dhahran, Saudi Arabia (GRID:grid.449337.e) (ISNI:0000 0004 1756 6721)