Recent Articles-IJCSER

Optimum design of reinforced concrete waffle slabs
Author(s)– Alaa C. Galeb, Zainab F. Atiyah

This paper deals with the problem of optimum design of reinforced concrete (two-way ribbed) waffle slabs using genetic algorithms. Two case studies are discussed; the first is a waffle slab with solid heads, and the second is a waffle slab with band beams along column centerlines. Direct design method is used for the structural analysis and design of slabs. The cost function represents the cost of concrete, steel, and formwork for the slab. The design variables are taken as the effective depth of the slab, ribs width, the spacing between ribs, the top slab thickness, the area of flexural reinforcement at the moment critical sections, the band beams width, and the area of steel reinforcement of the beams. The constraints include the constraints on dimensions of the rib, and the constraints on the top slab thickness, the constraints on the areas of steel reinforcement to satisfy the flexural and the minimum area requirements, the constraints on the slab thickness to satisfy flexural behavior, accommodate reinforcement and provide adequate concrete cover, and the constraints on the longitudinal reinforcement of band beams. A computer program is written using MATLAB to perform the structural analysis and design of waffle slabs by the direct design method. The optimization process is carried out using the built-in genetic algorithm toolbox of MATLAB.

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Recent Articles- IJAER

Design and Simulation of Phase Locked Loop Controller Based Three– Phase Unified Power Quality Conditioner for Non-linear and Voltage Sensitive Loads
Author(s)– JenoPaul, Ruban Deva Prakash, Jacob Raglend

This paper proposed a new efficient control system for unified power quality conditioner it is possible to reduce the voltage fluctuations like sag and swell conditions and current and voltage harmonics isolation in distribution systems. The UPQC which can be used at the PCC for improving power quality is modeled and simulated using proposed control strategy and the performance are compared by applying it to a distribution system with and without UPQC. The performance of this UPQC has been evaluated with a typical industrial load with realistic parameters supplied by a polluted distribution network. Dynamic model of the UPQC is developed in the MATLAB/SIMULINK environment and the simulation results demonstrating the power quality improvement in the system are presented to different supply and load conditions.

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