Abstract
Abstract Measuring structural damage during earthquakes has always been a challenging problem for earthquake engineers. Various damage indices are proposed with the objective of quantifying the structural damage in prototype and model structures subjected to seismic excitation. In this study, seismic vulnerability of irregular steel buildings is assessed in three dimensions considering effects of the panel zone, which has not been considered in recent studies of the field of seismic vulnerability. The buildings are modeled with different storeys and irregular plans. Seismic performance of buildings was assessed in life-safety and collapse-prevention levels. Cumulative functions of damage indices are applied in the nonlinear dynamic analysis of buildings in the near-field ground motions. It is concluded that participation rates of deformation and energy in the damage of irregular buildings are 74.5% and 25.5%, respectively. Severe damage and collapse due to seismic dissipated energy occurred in the initial storeys of low-rise buildings and in the middle storeys of high-rise buildings.
Highlights
Stiffened plates are extensively used in various engineering structures
To fulfil the some of the lacunae mentioned above, this paper presents the extensive parametric study for free vibration characteristics of stiffened plate, such as fundamental frequency and mode shapes, by developing finite element code as per Nayak and Bandyopadhyay (2002)
The design charts can be prepared for different bst/h and, the values of bst can be chosen suitably by linear interpolation as per the requirement of the designers. Free vibration characteristics, such as fundamental frequency and mode shapes, of stiffened plate are investigated to study the effect of stiffeners employing standard finite element method
Summary
Stiffened plates are extensively used in various engineering structures. The technique of stiffening a plate by providing beams is rather common and it gives higher value of strength to weight ratio of the structure. To study the influence of stiffeners on the mode shapes of clamped plates with different number and orientation of stiffeners at equal spacing, eccentric stiffeners are taken with two different values of the stiffener depth to plate thickness ratio.
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