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Bulletin of Earthquake Engineering

, Volume 16, Issue 11, pp 5503–5527 | Cite as

Seismic performance of modular steel frames equipped with shape memory alloy braces

  • Papia Sultana
  • Maged A. Youssef
Original Research Paper
  • 128 Downloads

Abstract

The demand for modular steel buildings (MSBs) has increased because of the improved quality, fast on-site installation, and lower cost of construction. Steel braced frames are usually utilized to form the lateral load resisting system of MSBs. During earthquakes, the seismic energy is dissipated through yielding of the components of the braced frames, which results in residual drifts. Excessive residual drifts complicate the repair of damaged structures or render them irreparable. Researchers have investigated the use of superelastic shape memory alloys (SMAs) in steel structures to reduce the seismic residual deformations. This study explores the potential of using SMA braces to improve the seismic performance of typical modular steel braced frames. The study utilizes incremental dynamic analysis to judge on the benefits of using such a system. It is observed that utilizing superelastic SMA braces at strategic locations can significantly reduce the inter-storey residual drifts.

Keywords

Modular steel building Shape memory alloy Seismic performance Incremental dynamic analysis Inter-storey drift Residual drift 

List of symbols

ASMA

Area of SMA braces

ASTEEL

Area of steel braces

bf

Flange width

ESTEEL

Modulus of elasticity, steel

ESMA

Modulus of elasticity, SMA

Fy

Yield stress of steel

H

Web height

K

Stiffness of braces

LSMA

Length of SMA braces

LSTEEL

Length of Steel braces

MCLx

Lower bound flexural strength of the member about the x-axis

MCLy

Lower bound flexural strength of the member about the y-axis

MUFX

Bending moment in the member about the x-axis

MUFY

Bending moment in the member about the y-axis

P

Axial force

PCL

Lower bound compression strength of column

PUF

Axial load in the member

tf

Flange thickness

tw

Web thickness

θy

Yield rotation

ΔT

Brace deformation at tension

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Civil and Environmental EngineeringWestern UniversityLondonCanada

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