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The Structural Engineer, Volume 67, Issue 14, 1989
Wednesday 17 May 1989 brought together representatives from universities, polytechnics, and colleges of further education, for the 4th annual Education Conference at Institution headquarters. Maureen Kitching
Members in private practice may be aware that the Institution has been investigating whether a ‘mutual’ insurance company might be of interest to some of its members as a means of providing professional indemnity insurance. J.A. Waller
This paper considers the time-varying behaviour of composite beams under sustained service loads. A non-linear method of analysis involving a Newton-Raphson solution procedure is developed and used to investigate the time-dependent response of composite cross-sections. The age-adjusted effective modulus method is used to model the constitutive relationship for concrete, while yielding and residual stresses in the steel joist are also accounted for. At typical service load levels, the effect of creep and shrinkage dominates the time-dependent reduction of stiffness, with the effect of residual stresses being only minor. M.A. Bradford and R.I. Gilbert