Author: Karaveziroglou-Weber, M;Barboutis, C;Kranas, B;Zombou, A
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Karaveziroglou-Weber, M;Barboutis, C;Kranas, B;Zombou, A
This paper presents an experimental investigation involving 12 reinforced concrete deep beams tested under fatigue loading. Three diflerent types of web reinforcement were investigated, and the tests revealed that web reinforcement has significant influence on the structural response of deep beams under fatigue loading. With load repetitions, the midspan deflection and the maximum crack width increased, while the shear strength decreased. Comparison with the current CIRIA guide design procedure for deep beams shows that the CIRIA guide may be safe for up to a certain range of load repetitions. S. Teng, W. Ma, K.H. Tan and F.K. Kong
Fixing steel sheet cladding Verulam has had another anonymous contribution in response to that from Mr Allan (19 May 1998). The problem where the fasteners fixing the steel spacer through a nylon ferrule to a structural rail had snapped overnight is well understood in the automobile industry and amongst manufacturers of bolts and self-drilling fasteners for roofing and cladding applications. The problem, known as ‘hydrogen embrittlement’, is created during the heat process. Very simply, hydrogen is trapped in the microcrevices of the fasteners. If the hydrogen is not removed a potential time bomb is introduced which, when exposed to moisture and certain salts, creates a small explosion which snaps the fastener.
Sam Thorburn bows out as President of the Institution afer a year of considerable activity in promoting the profession and the interests of members. Kathy Stansfield talks to him about his year in ofice and his views about the future for structural engineers.