Civil Engineering Association

SEISMIC ZONING OF KARACHI AND RECOMMENDATIONS FOR SEISMIC DESIGN OF BUILDINGS

Preface

For the seismic design of buildings, structural engineers in Karachi after selecting Moderate Seismic Risk Zone-2 from Geological Survey of Pakistan Maps have been using Uniform Building Code (UBC) for calculating gravity and earthquake loads and carrying out the analysis of the structural frames. Having determined the stress resultants and deformations from the analysis, the design and detailing of reinforced concrete are done in accordance with the requirements of the procedure of seismic design in ACI-318 or Chapter-I 9 of UBC. For other structural materials like steel, timber orstructural masonry, UBC or their respective Codes are used for sizing of the building members. Since 1984, Moderate Seismic Risk equivalent to UBC Zone-2 has been adopted for Karachi by the building designers. The Structural Department of Karachi Building Control Authority (KBCA) has approved the above procedure as the Acceptance Criteria for the structural design and drawings.

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junaid