Seismic Damage Assessment and Retrofitting of Hybrid Structure

Authors

  • O. Inderyas Ege University Izmir, Turkey
  • U. Ilyas UNIVERSITY OF MANAGEMENT & TECHNOLOGY, LAHORE
  • S. H. Farooq NIT (SCEE), National University of Sciences and Technology, Islamabad
  • A. Ajwad UNIVERSITY OF MANAGEMENT & TECHNOLOGY, LAHORE
  • N. Khadim University of Management and Technology, Lahore

Abstract

Pakistan is highly seismically prone country, which faced devastated earthquakes in history. The hybrid structures are very common in northern areas of Pakistan and their behavior under seismic event is very critical. The Seismic response of hybrid buildings is different from other structural systems as there is discontinuity, both in the lateral and vertical load transfer mechanisms. To assess the seismic damage of hybrid building for zone 2B and 3, the pushover analysis was carried out on a 6 story sample building with its 4 bottom stories of reinforced concrete frame and top two stories of steel frames for a maximum drift of 2.5%. Pushover analysis was performed using commercial software SAP2000 v15 and critical seismic deficiencies were determined. Basing on the identified deficiencies in stiffness as well as the ductility a comprehensive retrofit design was carried out. The hybrid building was retrofitted with shear walls and steel brace to remove the deficiencies in stiffness and ductility. After retrofitting pushover analysis was again carried out to determine the efficacy of retrofit design. The results revealed that retrofit intervention significantly improved the seismic performance of the hybrid building and increased the stiffness / lateral capacity by 47% and 42% respectively. Moreover, lateral displacements was also reduced by 37% and 42% by adding shear walls and braces respectively. The research outcome will help the local engineers and designers to properly retrofit the existing buildings in Northern Areas of Pakistan.

Author Biographies

O. Inderyas, Ege University Izmir, Turkey

PHD SCHOLAR

U. Ilyas, UNIVERSITY OF MANAGEMENT & TECHNOLOGY, LAHORE

ASSISTANT PROFESSOR, CIVIL ENGINEERING DEPARTMENT

S. H. Farooq, NIT (SCEE), National University of Sciences and Technology, Islamabad

ASSOCIATE PROFESSOR, CIVIL ENGINEERING DEPARTMENT

A. Ajwad, UNIVERSITY OF MANAGEMENT & TECHNOLOGY, LAHORE

ASSISTANT PROFESSOR, CIVIL ENGINEERING DEPARTMENT

N. Khadim, University of Management and Technology, Lahore

Department of Civil Engineering

References

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Oliveto, G. and M. Marletta (2005). "Seismic retrofitting of reinforced concrete buildings using traditional and innovative techniques." ISET Journal of earthquake technology 42(2-3): 21-46.

Myint, Kyi Thu "Seismic Evaluation of Steel Moment Frame Buildings Using Performance Based Design Concepts." The First International Conference on Interdisciplinary Research and Development, 31 May - 1 June 2011, Thailandâ€.

UBC (1997) Uniform Building Code. International Conference of Building Officials, Whittier, CA

ATC, 1997, Guidelines for the Seismic Rehabilitation of Buildings: Example Applications, prepared by the Applied Technology Council, for the Building Seismic Safety Council and the Federal Emergency Management Agency (FEMA Publication No. 276), Washington, D.C.

SAP 2000 Advanced structural analysis program, Version 15. Computers and Structures, Inc. (CSI). Berkeley, CA, U.S.A.

ACI 318, 1999, Building Code Requirements for Reinforced Concrete, American Concrete Institute, Detroit, Michigan.

AISC (1993). "Load and Resistance Factor Design Specification for Structural Steel Buildings," Second ed., AISC, Chicago, Illinois.

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Published

09-09-2020

How to Cite

[1]
O. Inderyas, U. Ilyas, S. H. Farooq, A. Ajwad, and N. Khadim, “Seismic Damage Assessment and Retrofitting of Hybrid Structure”, The Nucleus, vol. 56, no. 4, pp. 144–152, Sep. 2020.

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