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All Journal International Journal of Civil Engineering and Infrastructure (IJCEI)
Haryo Koco Buwono
University of Muhammadiyah Jakarta
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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NATURAL FREQUENCY OF SKEW PLATES USING FIRST-ORDER SHEAR DEFORMATION THEORY Haryo Koco Buwono; Budiman Budiman
International Journal of Civil Engineering and Infrastructure Vol 1, No 2 (2021): IJCEI Volume 1 No. 2
Publisher : University Of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.296 KB) | DOI: 10.24853/ijcei. 1. 2. 42-53

Abstract

This paper presents the free vibration analysis of skew plates based on the first-order shear deformation theory (FSDT). The development of finite element plates based on first-order shear deformation plate theory has been carried out and provides good results in plate element analysis. In this study, we investigate plate analysis in the case of free vibration to obtain natural frequency using one of the plate elements developed based on FSDT, numerical analysis was performed on skew plates case with varying skew angles and length to thickness ratios, the result will be used to see the convergence behavior and performance of plate element by comparing with the reference solution in the literature.
DYNAMIC BEHAVIOR OF FLOOR SLAB WITH STIFFENER BEAM DUE TO BLAST LOAD FROM MODIFICATION OF REED EQUATION Haryo Koco Buwono
International Journal of Civil Engineering and Infrastructure Vol 1, No 1 (2021): IJCEI Volume 1 No. 1
Publisher : University Of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (498.85 KB) | DOI: 10.24853/ijcei.1.1.14-22

Abstract

Explosions in buildings are not always the result of terrorist attacks, but can also be caused by several work accidents due to explosive tools or materials as trigger of problems in construction. Friedlander's equation has many modifications including the Reed equation. Reed proposes a modification of Friedlander equation using 4th order polynomial. The Reed equation is still not close relatively to the Friedlander equation. The Reed equation is only calculated up to t = 25/7 (s) in the negative phase. Meanwhile, the Friedlander is calculated at t = 5 if both are reviewed at no load or one unit condition. It is necessary to evaluate using the 4th order polynomial equation which is close to the Friedlander explosion equation. Dynamic behavior of structures must be considered in the design of structural elements. The purpose of this study is to analyze numerically the effect of explosions on orthotropic slabs which have partial fixity placement and stiffeners in the x direction, namely in the short span direction. The behavior of the plate orthotropic configuration, the localized blast load are centered in the middle of the strain, and the effect of thickness and stiffening on the vertical deflection of the plates are solved numerically using two auxiliary equations in the x and y-directions. From the analysis, it is found that there is vertical deflection with related to time. This paper introduces the dynamic behavior of Reed's modified blast loads with 4th order polynomial on orthotropic plates with x-direction stiffener beam.
Co-Authors Budiman Budiman