LSD - Philosophy of Design Introduction • A structure...

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Unformatted text preview: Philosophy of Design Introduction • A structure should be – Safe – Economical to build – Maintainable – Aesthetically pleasing These are what structural engineers aim at in designing a structure Introduction • The engineering design process are often divided into 2 stages 1. Feasibility study and/or conceptual design involving a comparison of the alternative forms of structure and selection of the most suitable one 2. Detailed design of the chosen structural form Introduction • The success of conceptual design relies on engineering judgement and instinct, both of which are the result of many years of experience • The detailed design is more dependent on a thorough understanding of codes of practice for structural design Basis of design Basis of design • To ensure that stresses due to loading at all critical points in a structure have a very low chance of exceeding the strength of materials used at these critical points • Example of critical point – Mid-span section (max. bending) – Supports of a beam (max. shear; min. bending) • Factors affecting the maximum material stresses at critical points – Loading varies according to occupancy and environmental conditions – Imperfect design process • Factors affecting the material strengths at critical points – Variability of manufacturing condition P r o b a b i l i t y d e n s i t y f u n c t i o n Load effect, Q Strength or resistance, R Q R Q n R n Q , R Figure 1. Relationship between load effects and strength...
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This note was uploaded on 12/01/2010 for the course CIVL 2007 taught by Professor Profchai during the Spring '10 term at HKU.

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LSD - Philosophy of Design Introduction • A structure...

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