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All Journal Jurnal Teknik Sipil Jurnal Teknik Sipil dan Perencanaan
Andri Budiadi, Andri
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Civil Engineering, Building, Construction & Architecture Transportation

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Decreasing Strength of Prestressed Concrete Beams Due to Failure of Part of the Strands Withdrawal Budiadi, Andri
Jurnal Teknik Sipil dan Perencanaan Vol 26, No 1 (2024)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v26i1.47294

Abstract

Abstract.This research paper is to study the decreasing strength of a 22,1 meter long span Prestressed Concrete U Girder due to two strands in a tendon out of six tendon are not being able to be stressed. This matter is a cause of an error in the implementation of the PC-U girder manufacturing resulted in a reduction in the area of the tendon sleeve (duct), two out of seven pieces of the strand cannot be inserted completely. PC-U girder performance will suffer a strength decrease, it needs to be checked and handled.  This paper is an actual project condition and researched to verify how much strength reduction due to such a case.  Analysis is performed to measure and compare the moment capacity of a cross-sectional conditions in accordance with the results of the designed section. Moment capacity analysis is carried out to determine the ability of the cross section to support the working load with a bonded tendon. Research methodology involves calculation of moment capacity Mu using trial and error processes of calculating the depth of neutral axis c using Equilibrium Equation so that with a trial c value, ultimate prestressed strain value εpu and ultimate prestresses stress value σpu are coincided in the Moment-Curvature curve line. Using the overlapped c value, Moment capacity of the girder with full strand can be calculated. A similar procedure is performed with reduced strand number. The difference between the two are the reducing prestressed concrete strength. Evaluating both analyses, it is found that a decrease in the moment capacity of the cross section as much as 530,93 kNm to the designed moment capacity of 18.108,06 kNm or approximately 2,93% of its original designed strength.
EFEKTIVITAS TUMPUAN ISOLATOR KARET UNTUK MENGURANGI AKSELERASI SEMU GEMPA BUMI Budiadi, Andri
Jurnal Teknik Sipil Vol. 18 No. 4 (2026)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/jts.v18i4.14371

Abstract

This research paper is to study the effect of using Rubber Bearing as Base Isolator. Two analyses are performed in this study. The first analysis is using a whole building structure to be calculated its period and to be estimated its pseudo acceleration for both fixed and isolated bases. The second analysis, period calculation and estimation of pseudo acceleration is using a single column of the building structure. Method of analysis is using basic vibration formulas. The calculated parameters are stiffness of the structure, damped frequency, undamped natural frequency and period of vibration.  Using response spectra of the building, pseudo acceleration is estimated by plotting vibration period for both fixed and isolated supports. Trial-and-Error processes are needed to find where along response spectra three lines types two pairs of the coordinate of period and pseudo acceleration reveal the increasing value of period and decreasing value of acceleration.   Comparing the pseudo acceleration of fixed and isolated base, for the first analysis, the pseudo acceleration decreases up to 53,85 %. Pseudo acceleration decreases by 51,79 % for the second analysis. The decreasing value of earthquake acceleration is only possible when both fixed and isolated base structural periods fall in the Curved down line in the response spectrum diagram.
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