Reliability analysis and safety measures of British and Chinese reinforced concrete building codes

Pao Yue-kong Library Electronic Theses Database

Reliability analysis and safety measures of British and Chinese reinforced concrete building codes


Author: Ng, Kwok-keung
Title: Reliability analysis and safety measures of British and Chinese reinforced concrete building codes
Degree: M.Sc.
Year: 1996
Subject: Building -- Great Britain -- Safety measures
Building -- China -- Safety measures
Building laws -- Great Britain
Building laws -- China
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: vii, 95, [49] leaves : ill. ; 30 cm
Language: English
Abstract: Nowadays, many design codes such as the British Building Code (BS8110), the American Building Code (ACI318-89), the Chinese Building Code (GBJ1O-89), etc. use the load and resistance factor design approach (LRFD). The partial safety factors (which include load and material factors) specified in these codes have been established in such a way that the structures resulting from their application would have an adequate and consistent reliability. An established method to ensure consistent reliability of a structure is to define the target values of the desired probability of survival, commonly expressed by the reliability index B, and thereafter to derive partial safety factors applied to different limit states of strengths under flexure, shear, compression and torsion. In this research project, the reliability analysis of loading and strength specified in the reinforced concrete building codes of Britain and China are studied and compared. This includes the background information on the development of the characteristic loads and material strengths used in the building code of the target countries. The adequacy in strength provision and the effects on the cost of construction of typical building structures are quantified and presented. In this thesis, it is found that the British code gives a safer design in comparison with the Chinese code of practice as the British code suggests a greater load effect and provide a lesser extent of resistance capacity during design stage. Besides, the variation of material properties such as like steel strength and concrete grade are found to seriously affect the overall structural safety of the building. This is the reason why material safety factors are used in the design equations of both codes of practices to take into account material properties variations whereas no safety factors are needed to cater for the variation of other constituent elements in the design equations like dimensions of the section. Moreover, the shear mode of failure for beams and the flexural mode of failure for columns are found to be the controlling failure criteria for members.

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