A study on formation of new large openings in planar reinforced concrete shear walls of existing tall buildings

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A study on formation of new large openings in planar reinforced concrete shear walls of existing tall buildings

 

Author: Li, Wai-sang
Title: A study on formation of new large openings in planar reinforced concrete shear walls of existing tall buildings
Degree: M.Sc.
Year: 1995
Subject: Concrete walls
Shear (Mechanics)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: vi, 109, xli leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1205002
URI: http://theses.lib.polyu.edu.hk/handle/200/2038
Abstract: Shear walls have been for long used as major vertical structural members in tall buildings to sustain vertical and lateral loads. They are designed and detailed to meet the loading, strength and functional requirements. Due to status change at a late stage such as redevelopment, refurbishment, etc., large openings to as-built shear walls in particular on ground floor are often demanded. Lateral deflection of shear walls at top floor and stresses at critical positions of wall such as its edges, periphery of opening, etc. are affected to various extents by the formation of openings to the walls. A commercial computer program of finite element method was employed to analyse these shear walls under various loading conditions. Several models of shear walls were developed and the data from computer outputs were abstracted and correlated so as to examine the behaviour of wall before and after being perforated. It was revealed that deflections and stresses upon formation of opening at ground floor could differ a lot. Gravity load has been shown to have played an important role in such deviation. While new deflections of walls at top floors were usually not controlling in some buildings, increase in stresses at certain spots of walls might lead to downgrading in their structural adequacy. The regions of wall where the existence of openings could be accepted in respect of deflections and stresses have been identified, and the charts prepared for this purpose might be helpful to the practising engineers. Finally, artificial strengthening works required as a result of forming opening were briefly discussed and were proved to be useful especially at the vicinity of opening.

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