DISPLACEMENT-BASED SEISMIC PERFORMANCE EVALUATION OF DHAJJI STRUCTURAL SYSTEMS

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DISPLACEMENT-BASED SEISMIC PERFORMANCE EVALUATION OF DHAJJI STRUCTURAL SYSTEMS

Naveed Ahmad1, Qaisar Ali2, Helen Crowley3 and Rui Pinho4
Abstract
The paper presents the derivation of mechanical models, using experimental and numerical
investigations, for the development of displacement-based seismic performance evaluation of
Dhajji wall, timber-braced frame with masonry infill, structural systems. The mechanical
model uses secant vibration period, limit state displacement capacity, viscous damping and
overdamped displacement spectrum to assess the global seismic performance of structures.
Three full scale Dhajji walls typical of current construction practice in Pakistan are tested
quasi-static-cyclically to obtain drift limits, hysteretic response, viscous damping and strength
envelope of Dhajji walls which are analyzed to develop a simplified method for the nonlinear
dynamic time history analysis of Dhajji structures using equivalent frame approach. Thirty-six
case study 2D structural models, representing regional building stock, are analyzed using
natural accelerograms in order to develop limit state vibration period and displacement
capacity formulae. Controlled Monte Carlo simulation is used to generate random populations
of regional building stock, taking into account the uncertainties in the geometrical and
mechanical properties of the systems, to develop analytical fragility functions for Dhajji
buildings, which, along with the fragility functions for other building typologies, can be used
for seismic risk map development, regional code development, modeling insurance schemes,
earthquake preparedness and planning and decision making in the region. Case study
application is performed to derive damage probability matrices for scenario earthquakes in
the region in order to estimate the number of Dhajji buildings required to be retrofitted.
Keywords: Displacement-Based; Nonlinear Static; Seismic Risk Assessment; Dhajji;
Pakistan.

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