Failure of scaffolding in construction

Pao Yue-kong Library Electronic Theses Database

Failure of scaffolding in construction


Author: Suen, Sing-wah
Title: Failure of scaffolding in construction
Degree: M.Sc.
Year: 1999
Subject: Scaffolding
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Civil and Structural Engineering
Pages: v, 85 leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: In this dissertation, scaffolding failure modes are studied with the intention for finding out common causes to the failure. The available standards, common practice and statutory control are reviewed to check if the common causes can be prevented from occurring. Requirements laid down in the four British Standards BS 1139, BS 5973, BS 5975 and BS 5950 regarding scaffolding are discussed. Failure related to the practice on site and in design office is reviewed. Different methods of structural analysis for the scaffold are compared among themselves and with published results from loading tests. The computer program NAF-NIDA developed by Professor S. L. Chan is used for computer analyses in this dissertation. One of the major advantages of the computer program over other commercial programs is that secondary effects, which should not be ignored for skeletal frames, are taken into account in a rigorous manner. The effects of the commonest causes of scaffolding failure are discussed. They include the absence of braces, differential settlements of foundation and under-estimation of effective length of a compression member. At the end of this dissertation a conclusion is given as a result of the studies in this dissertation. The frequent scaffold failure incidents, for instance, 3 scaffold collapses have been reported occurred recently within 5 months from November 1998 to March 1999 locally in HKSAR. Although investigation for each of the failure cases are undergoing, it is believed that the failure incidents could have prevented had the common causes of failure been avoided.

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