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Nigerian Journal of Technology

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Rigid and Elastic Sub-Base Effects on Tall Steel

EB Oyetola

Abstract


The function of the frame system in a structure is to carry loads (dead, imposed and wind) acting on the structure. The frames strengthen the high-rise steel building and guarantee the stability of the whole system. Additionally, they transfer these load unto the foundation. However, the main structure's subsequent behaviour on the sub-base (soil) which is elastic in nature (5) has more to be desired: The paper investigates the working conditions of tall steel frames (twenty storeys) under dead, imposed and lateral toads. The whole frame-system are designed resting on rigid strip support (k=¥) and on elastic sub-base (k=1500T/m3). The vertical loads (dead and imposed) and the horizontal loads were treated separately for the frames. One of the oldest models of elastic sub-base proposed by E. Winkler (1867) was employed. It is believed that this gives a realistic behaviour of the frame during construction. The result confirmed that some assumptions in existence both in, soil mechanics, as well as, in structural analysis can be improved upon with the new information technology. The result achieved, is remarkable.




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