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Review Article

Seismic Behavior of Horizontally Irregular Structures: Current Wisdom and Challenges Ahead

[+] Author and Article Information
Suvonkar Chakroborty

General Manager
SMS India Pvt., Ltd.,
SMS Group,
Kolkata 700 091, India

Rana Roy

Professor
Department of Aerospace Engineering and
Applied Mechanics,
Indian Institute of Engineering
Science and Technology,
Shibpur (Erstwhile Bengal Engineering and
Science University, Shibpur),
Howrah 711 103, India
e-mail: rroybec@yahoo.com

1Corresponding author.

Manuscript received April 13, 2016; final manuscript received September 13, 2016; published online October 10, 2016. Editor: Harry Dankowicz.

Appl. Mech. Rev 68(6), 060802 (Oct 10, 2016) (17 pages) Paper No: AMR-16-1027; doi: 10.1115/1.4034725 History: Received April 13, 2016; Revised September 13, 2016

In view of the stronger vulnerability of horizontally irregular structures during earthquakes, numerous studies have been made since mid-1950 s. Unfortunately, research progress in this subject does not appear encouraging. This is evident from the current wisdom embodied in modern codes in the form of design guidelines. Beginning with a critical review of the earlier works and the available code-provisions, the present paper emphasizes on the prevalent controversies and the fundamental fallacies in research studies and traditional design. The review intends to address the strength vis-a-vis weakness of the studies accomplished so far and helps streamlining future research. The present paper also summarizes the updated views for selecting and processing appropriate set of ground motions. This is a key input in seismic response assessment and a major reason of the existing controversies in the subject of asymmetry. A prognostic scrutiny of the research progress recognizes the prospective challenges ahead.

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Figures

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Fig. 1

Displacement of edge elements due to a static lateral force at CM and the identification of flexible and stiff elements (after minor modification, reproduced from Ref. [13] with permission from Techno Press)

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Fig. 2

Number of major publications appeared in every 5-year interval expressed in percent of total publications since mid-1950 s

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Fig. 3

Breakdown of number of major publications in different identified categories

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Fig. 4

Idealized force–displacement relationship of wall-type elements (after minor modification, reproduced from Ref. [195] with permission from Wiley): (a) lateral load-resisting wall; (b) constant stiffness model (traditionally used); and (c) constant yield displacement model (more realistic)

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Fig. 5

Implications of (a) strength independent stiffness and (b) strength dependent stiffness in seismic design (after minor modification, reproduced from Ref. [184] with permission from Elsevier Limited)

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