Abstract
Wind load calculations are done for a medium-rise building with 48 m height locates in an urban area of Sri Lanka. Five different international wind loading standards were selected to calculate wind loads according to prevailing conditions in Sri Lanka. Available 3 second gust wind speed is converted in to mean hourly wind speed and 10 minutes average wind speed to use selected wind loading standards. The difference of wind load calculations is evaluated by using member forces in columns, beams, and shear walls obtained from a 3–D finite element modelling. The comparison displays that both the Australian standards yields higher wind loads compared to other selected standards. The use of higher terrain-height multiplier for cyclone prone zone 1 contributes much larger member forces compared to other cases. None of the standards exceeds the serviceability criteria, which evaluate by means of drift index. ENGINEER, Vol. 47, No. 01, pp. 25-35, 2014
Highlights
Medium rise buildings are less sensitive to wind loads compared to high-rise buildings that are subjected to wind loads with same magnitude
This kind of direct adoption of international wind loading standards is questionable because less harmonisation of wind load calculations exist among different wind loading standards
Wind load calculation is done for a 48 m height building by using five international wind loading standards
Summary
Medium rise buildings are less sensitive to wind loads compared to high-rise buildings that are subjected to wind loads with same magnitude. Most of these buildings have 2 to 5 storeys but sometimes can be as many storey as 15.Because Sri Lanka is yet to prepare its own wind loading standard, most of these buildings were designed according to various international wind loading standards These standards range from previous British code of practice CP3 Chapter V- Part2:1972[1] to newest wind loading standards such as EN 1991-1-4:2005[2]. The similarities and differences of derived wind loads from five different wind loading standards are evaluated by comparing several types of structural loads including axial force, shear force, bending moment obtained from Finite Element Model (FEM) of the building. Conclusion illustrates the possible reasons for differences and similarities on wind load calculation done with five different wind loading standards
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