Influential Codes for Optimum Design Parameters of Wide Span Circular R.C. Halls
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 4
Abstract
Skeletal wide-span circular halls possess large number of variables that cannot be easily identified unless rigorous three-dimensional analysis is managed. Structural optimization for minimum total cost as an objective function needs subdivision of the mathematical process into subsequent phases in order that discretevalued solutions of slabs, beams, columns and foundation in RC skeletons. Value engineering implementation to such large projects necessitates the examination of various alternatives for the most effective solution. In this study, two-phase genetic algorithm (GA) technique was operated for the search-find procedure for the best solution fulfilling the design constraints after selective design codes. ACI318-14, Eurocode EC2-8 and Egyptian code ECP203-14 were considered to inspect the impact of different approaches on the overall cost. Reinforcement rebar waste minimization was further integrated in the proposed methodology througha commercially specialized software that provided the best curtailment in workshop documentation for different bar splices. Implementation hasbeen directed to 80.0m diameter two story hall including a circumferential sector of 24.0m open span in the upper floor. The results indicated that the ACI318-14 provided the least cost for 30MPa concrete characteristic cube strength and steel grade 400/600 MPaof12.1% and 7.2% less than EC2 and ECP203-17, respectively. The optimum solution of the specified architecture led to members dimensioning that behaved as a nonprismaticvierendeel. Near optimum solution saved about 9-11% over the typical design. Although special orders of reinforcement rebars longer than 12.0m yielded the least cost compared with conventional lap splices and mechanical couplers but the difference is minor compared with the overall cost. Finally, the optimum solution predictions were found to be comparable with other alternatives of nonprismatic cylindrical shell and folded plate roofing system.
Authors and Affiliations
Salah El-Din Taher, Sherif Elwan, Ahmed Ehab Abd El-Hameed
Keywords
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- EP ID EP438434
- DOI 10.9790/1684-1504035469.
- Views 95
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