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Sukamdo, Pariatmono
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Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Transportation

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Perbandingan Pengaruh LRB (Lead Rubber Bearing) Dan FPB (Friction Pendulum Bearing) Pada Perilaku Struktur Jembatan (Studi Kasus Jembatan Tol Layang Dalam Kota Jakarta) Dzikri Fauzan, Ahmad; Sukamdo, Pariatmono
Konstruksia Vol 15, No 1 (2023): Jurnal Konstruksia Vol 15 No. 1 Tahun 2023
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jk.15.1.97-111

Abstract

Penelitian ini membandingkan pengaruh penggunaan LRB (Lead Rubber Bearing) dan FPB (Friction Pendulum Bearing) terhadap perilaku struktur jembatan di Kota Jakarta dengan geometrik alinyemen berbelok pada salah satu ramp diarea interchange. Geometrik alinyemen jembatan telah terbukti memengaruhi kinerja struktur.  Pemilihan jenis perletakan jembatan seperti LRB dan FPB juga dapat meningkatkan kinerja struktur terutama saat terjadi gempa. Penelitian ini menggunakan analisis respon spektra dan analisis nonlinear riwayat waktu untuk memeriksa respon struktur seperti perpindahan, gaya geser dasar, gaya momen, dan gaya normal. Faktor-faktor seperti geometrik alinyemen, ketinggian pilar, serta jenis perletakan (LRB atau FPB) menjadi pertimbangan dalam penelitian ini. Desain dimensi LRB dan FPB mengikuti pedoman AASHTO Guide Specification for Seismic Isolation Design dan Technical Report MCEER-13-0010. Pemodelan dan analisis struktur menggunakan perangkat lunak CSI Bridge24. Hasil penelitian menunjukkan bahwa alinyemen berbelok pada jembatan berpengaruh signifikan terhadap respon struktur. Penggunaan LRB mengurangi nilai respon struktur perpindahan 81%, gaya geser dasar 52%, gaya momen 45%, dan gaya normal 8%. Sementara penggunaan FPB mengurangi nilai respon struktur perpindahan 84%, gaya geser dasar 58%, gaya momen 48%, dan gaya normal sebesar 10%. Secara keseluruhan, FPB lebih efektif daripada LRB dalam mengurangi nilai respon spektra, dengan pengurangan lebih besar, yaitu sekitar 2%-6%.
Pengaruh Batu Kuarsit dan Gamping Koral Terhadap Kehilangan Kuat Tekan Pada Beton Dalam Kondisi ASR Setiyadi, Syukur; Muin, Resmi Bestari; Sukamdo, Pariatmono
Konstruksia Vol 15, No 1 (2023): Jurnal Konstruksia Vol 15 No. 1 Tahun 2023
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jk.15.1.1-13

Abstract

Batu kuarsit dan Batu gamping wilayah pesisir Kab. Pati dan Kab. Blora belum termanfaatkan optimal sebagai agregat kasar [23]. Diteliti sifat fisik agregat kasar serta komposisi kimia, untuk kemudian digunakan dalam mendapatkan karakteristik beton agregat kasar kuarsit dan batu gamping. Pengujian 18 (delapan belas) silinder beton QS 70%:30% LS pada kondisi perawatan terendam air suhu 20°C untuk kuat tekan, kuat tarik belah, dan modulus elastisitas dilaksanakan. Dievaluasi komposisi kimia CaO agregat kasar dan hubungannya dengan kuat tekan beton. Pengujian Lost in Compressive Strength dilakukan atas 6 silinder beton dalam lingkungan ASR 80°C. Penggantian 30% agregat kasar kuarsit (QS) dengan batu gamping (LS) menunjukkan hasil kuat tekan 19.69 MPa dan 29.85 MPa untuk w/c rasio 0.61 dan 0.47 secara berurutan. komposisi kimia CaO (Calcium Oxide) QS dan LS dengan nilai 49.293% dan 54.462%, adapun kandungan SiO2 diperoleh 2.874% dan 1.517% untuk QS dan LS secara berurutan. Terdapat hubungan negatif lemah antara kandungan CaO agregat kasar terhadap kuat tekan beton dan density beton. Terjadi kehilangan kuat tekan (LICS) sebesar -4.7% pada beton w/c 0.61 dan 13.7% untuk beton w/c 0.47, mengindikasikan terdapat peningkatan kuat tekan 4.7% untuk beton w/c rasio 0.61 dan terjadi penurunan kuat tekan 13.7% untuk beton w/c rasio 0.47 pada umur 28 hari lingkungan ASR.
Fourier representation of geometrical imperfection for probabilistic buckling analysis Sukamdo, Pariatmono; Oktavia, Tuti; Muin, Resmi Bestari; Ontowirjo, Budianto; Ihsan, Mohammad; Sitompul, Sang Toga
SINERGI Vol 28, No 3 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2024.3.003

Abstract

This research studies the first part of the failure of a compression member structure due to buckling. This unstable equilibrium collapse, exposes brittle failure which occurs suddenly and therefore should be avoided wherever possible. Unavoidable geometric imperfections due to structural fabrication, will weaken the structure against buckling. The behavior of bar under compression will be closely examined by taking a set of geometric imperfection data synthesized from previously available from the measurement of conical shells. Therefore, the two-dimensional surface imperfection is converted into several one-dimensional imperfection with some probability properties. In order to obtain a comparison tool for different type of imperfections, Fourier analysis is used to convert the imperfection into coefficients of trigonometric function. By examining the coefficients, geometric imperfection patterns introduced by a certain fabrication process are able to be identified. The study successfully demonstrates the applicability of Fourier analysis in representing inherent geometric imperfections as an initial step for conducting probabilistic buckling analysis. Fourier analysis has shown its capability to simultaneously characterize imperfections in two crucial parameters - the magnitude and configuration of the imperfection.
Static and Dynamic Response of Curved Concrete Frame Structures (Case Study: Jakarta International Stadium) Sanjaya, Arif; Sukamdo, Pariatmono
Rekayasa Sipil Vol 13, No 1 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jrs.2024.v13.i1.03

Abstract

An ideally designed building should be symmetrical to mitigate eccentricities between the center of mass and the center of stiffness during seismic events. However, suppose a special design is intended to enhance the aesthetics and visual appeal of a building. In that case, it should still be engineered to perform well in static and dynamic behaviours. Jakarta International Stadium is an example of a building with a circular shape, irregular vertical geometry, and lacks expansion joints. This research investigated the static and dynamic behaviours of four structural models: the entire building without expansion joints (model ND) andthe building with expansion joints (models D1, D2, and D3). The analysis included internal forces, mode shape analysis, structural displacements, inter-story drifts, and base shear forces. The analysis is conducted using the SAP2000 v22 software. The analysis results indicated that the models with expansion joints in Jakarta International Stadium generally exhibit several positive effects. These included reducing structural displacements, inter-story drifts, internal forces, and base shear forces. Furthermore, all modalities remain within the standard limits SNI 1726-2019 set.
Real Response Modification Value of Reinforced Concrete Structures Using the Pushover Method in Horizontal Irranged Buildings Octaviani, Rien; Bestari, Resmi; Sukamdo, Pariatmono
ASTONJADRO Vol. 14 No. 1 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i1.16264

Abstract

The country of Indonesia is prone to earthquakes, because geographically Indonesia is located at the meeting point of four tectonic plates, namely the Asian continental plate, the Australian continental plate, the Indian Ocean plate and the pacificocean plate. An earthquake is a vibration or shock that occurs on the surface of the earth due to the sudden release of energy from within, creating seismic waves. Earthquakes are usually caused by movements of the earth's crust (earth plates). Planning an earthquake-resistant building structure in Indonesia is very important, because most areas in Indonesia are in fairly high earthquake areas, so earthquake regulations, namely SNI 1726-2019, have been issued. Design re-planning or follow-up can be done using the real R value. If in the SRPMK structure the real R value is greater than the design R, then the planner can save reinforcement by re-analyzing the structure using real R. With the results of this research analysis, it can be concluded that the SRPMK structure with horizontal irregularities at the Jakarta location, produces a real modified response (R) value (referring to the ATC-40 limit on the ratio of deviations between floors and the rotational capacity of structural components) which is smaller than the specified maximum value. on SNI. In accordance with the provisions of ATC-40, all structural configurations are included in the Damage Control (DO) category level, which means that the transition between Immediate Occupancy (IO) SP-1 and Life Safety (LF) SP-3, the building is still able to withstand the forces of the earthquake that occurred, with the risk of human loss is very small. Only SRPMB's 8-story medium ground structure is included in the Life Safety (LF) category level SP-3. The real R value obtained in the SRPMK structure varies between 7.218 – 8.515. The results of this analysis are not significantly different from existing provisions, and in soft soil conditions the value is smaller than for the SRPMB structure. Real R less than the provisions is the maximum value that can be used based on this research. The real R value obtained in the SRPMB structure varies between 5.081 – 10.276. The results of this analysis are very different from the existing provisions for both soft and medium soil conditions; and Structural optimization has been carried out in each building configuration, but it was found that the cross-sectional dimensions of the SRPMB columns and beams in soft soil conditions were the largest cross-sectional dimensions compared to the others.
Analisis Tekuk Probabilistik Pada Batang Tekan dari Baja Ringan Oktavia, Tuti; Sukamdo, Pariatmono
Rekayasa Sipil Vol 13, No 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jrs.2024.v13.i2.06

Abstract

Lightweight steel profiles have relatively thin thickness dimensions with the ratio of the dimensions of the width of each profile element to the thickness is very large, making it prone to bending. In SNI 8399:2017, mentions tolerances for geometric imperfections Bow (bw) (in the perpendicular direction Z-Z),  Twist (h) (X-X direction), Camber, profiles C, Z, U. SNI 8399: 2017 has not been explained what kind of decrease in column strength against  these geometric imperfections. In this study, an analogy was made to the measurement of imperfections in the geometry of the decapitated cone plate  conducted by Pariatmono, 1994. In Pariatmono's research, data  from the circular axis was changed into a horizontal axis by taking several angles in a circle, in this study it was taken every 6º (60 data in one row) and used as data with probablistic behavior. Then from the 60 rods obtained, Fourier analysis was carried out to obtain geometric imperfection equations. From these 60 bars obtained each Fourier coefficient. Then the average is taken, averaging +10%, +20%, +30%, +40%, +50% and -10%, -20%, -30%, -40% and -50% of the standard deviation values. Of the 11 rods, a non-linear buckling analysis was carried out using ANSYS Workbench 2022 R1. The probabilistic compressive analysis of geometric imperfections conducted in this study has not been able to definitively provide a general idea of the limits of geometric imperfections.
PENGEMBANGAN SPEKTRA RESPONS DARI GEMPA RIWAYAT WAKTU PALU 2018 Rifaldy, Indra; Sukamdo, Pariatmono
Rekayasa Sipil Vol 14, No 1 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Indonesia is at the summit of three world plates – the Indonesian plate – Australia, the Eurasian plate, and the Pacific plate, so the earthquake activity that occurs in Indonesia is quite high. On Friday, September 28, 2018, at 18:02 WITA there was an earthquake that shook Palu M 7.4 and a depth of 10 km. This study aims to build a response spectrum from the 2018 Timeline Earthquake. The maximum spectral values of the vibration are obtained at each vibration period value of the T structure and then imploted into such a vibration spectrum, indicating that the beginning of the production of the response spectrum begins with the calculation of the angular velocities and periods of vibration of wi and Ti on the information of the behavior of ki and mi masses. The numerical method of the Central Difference uses an approach to the derivative value of a time function or a derivative of the time movement, both for velocity parameters and acceleration parameters. The SDOF response consists of a two-dimensional structure analysis by inserting the parameters of the Palu Response Spectrum 2018 with the help of a program to determine how the SDOF Response is. Development of the displacement response spectrum HNE 160,60 cm T2,98 sec, HNN 230,09 cm T4,69 sec, and HNZ 94.43 cm T4,97 sec. Velocity HNE maximum 335,79 cm/d T2,98 seconds, HNN 307.30 cm/de T4,69 sec, and HNZ 143,98 cm/sec T2,11 sec. Acceleration HNE 1480 cm/det2 T0,23 seconds; 1850 cm/det2 T 0,38 sec and HNZ 3773 cm/sec2 0,12 sec.
Co-Authors Arif Sanjaya Dzikri Fauzan, Ahmad Mohammad Ihsan Octaviani, Rien Oktavia, Tuti Ontowirjo, Budianto Resmi Bestari Muin Resmi Bestari, Resmi Rifaldy, Indra Setiyadi, Syukur Sitompul, Sang Toga