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Title |
An Optimization of a Walkway Block Structure for Rainwater Harvesting
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Authors |
조태준(Taejun Cho) ; 손병직(Byung-Jik Son) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.1.040 |
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Keywords |
빗물 저장 ; 보도 블록 ; 최적화 ; 유한 요소 해석 Rainwater harvesting ; Walkway block ; Optimization ; Finite element analysis |
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Abstract |
Porous walkway blocks are constructed for the purpose already, but reserved water is easily consumed due to the bigger permeability than necessary. Furthermore, porous structure reduces the strength of blocks, which resulting cracking and settlements in walkways. In this study, we suggested a solution for given problems by determination for the location of minimum principal stress in walkway blocks against moving foot loads in order to design and verifying the determined location of minimum principal stress. An optimum design with a verification example for determined location of minimum principal stress have been presented in a two dimensional Block member on elastic foundation for pedestrian walkway for reserving water inside. The minimum value for sum of shear forces is found when x1 is 58.58 mm(30% of total span, 200mm), while the minimum deformation is located at x2= 80 mm(70% of total span, 200 mm). In a modified model, When moving boundary condition(walkway foot loads) is located at x1(=0 mm), the location of minimum principal stresses is found at 168 mm( 84% of span, 200 mm), in which the stress concentration due to the foot load is modeled as two layers of distributed loads(reactions of foundation modeled as springs). Consequently, zero deformed reservoirs for rainwater on the neutral axis (x2=167 mm) has been determined in the modified model with three dimensional FEM analysis verifications.
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