An improved rapid visual screening method for seismic vulnerability assessment of reinforced concrete buildings in Indian Himalayan region

Integrated approach between seismic resilience and vulnerability indexes with regularity index for vertical irregularity planar frames risk assessment

Android application of rapid visual screening for buildings in indian context

Seismic Performance of Reinforced Concrete Buildings on Hill Slopes: A Review

High‐rise buildings with vertical setbacks are more prone to damage in the event of strong earthquakes. This paper presents an extensive parametric study on the seismic performance of reinforced concrete (RC) frame‐shear wall structures with different setback configurations. Five groups of RC frame‐shear structures with 30 setback configurations were designed. Before conducting extensive non‐linear time history structural analysis, modeling of main lateral force resisting systems including RC column and shear wall was validated using previous test results. By parametric analysis on both horizontal setback ratio and vertical setback ratio, the influences of setback on structural seismic performance in terms of dynamic property, inter‐story drift ratio, acceleration, energy dissipation, and damage condition were comparatively investigated. The overall conclusion is that setbacks caused more than 50% reduction of floor area or positioned at the middle and lower height should be avoided.

Parametric analysis on seismic performance of reinforced concrete frame‐shear wall structures with different setback configurations

Seismic vulnerability assessment of a large group of buildings can prove to be extremely difficult as it requires huge amount of time and resources. Rapid Visual Screening (RVS) alleviates this problem by classifying buildings into different classes of vulnerability thereby limiting the need for detailed analysis only to a few selected vulnerability classes. RVS survey of five G+1 houses were conducted using Arya et al. method, Sinha et al. method, Jain et al. method, FEMA Level 1 and FEMA Level 2 method. The lack of details regarding irregularities resulted in the same RVS score for buildings with significantly different configurations. This renders the RVS procedure difficult to be used for comparison. This paper provides a qualitative comparison of seismic vulnerability among vertically irregular buildings in terms of mass, geometric and stiffness irregularity through Rapid Visual Screening. 3D Response spectrum analysis of reinforced concrete buildings have been done using STAAD Pro software and Seismic Vulnerability Indicator (SVI) values are calculated for comparison of seismic vulnerabilities with respect to vertical irregularities. Mass irregularity near the mid height of building or stiffness irregularity below the mid height of building is found to be more critical among the possible locations of irregularity. Elevation asymmetry above mid height is found to decrease the seismic vulnerability of a building. Presence of stiffness irregularity is found to be significantly more critical than mass or geometric irregularity.

Suhail Ishack

Papers

Rapid Visual Screening method for vertically irregular buildings based on Seismic Vulnerability Indicator