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All Journal Rekayasa Sipil Jurnal Teknik Sipil Teras Jurnal Astonjadro Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Makara Journal of Technology
Yuskar Lase, Yuskar
Departemen Teknik Sipil, Fakultas Teknik, Universitas Indonesia Kampus Baru UI - DEPOK.
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering

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Tinjauan Nilai Faktor Modifikasi Respon (R) dan Faktor Kuat Lebih (O) pada Struktur Gabungan Rangka Baja dan Rangka Beton Bertulang dengan Analisis Pushover Prabowo, Andy; Lase, Yuskar
Jurnal Teknik Sipil Vol 23, No 1 (2016)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (509.891 KB) | DOI: 10.5614/jts.2016.23.1.8

Abstract

Abstrak. Adanya peningkatan kebutuhan ruang yang semakin tinggi serta didukung oleh regulasi yang berlaku khususnya di daerah padat, memungkinkan perluasan vertikal bangunan. Perluasan vertikal seringkali dilakukan dengan menambah struktur rangka baja yang berdiri di atas struktur eksisting dari rangka beton bertulang. Sistem pemikul beban lateral pada struktur yang diperluas dapat menggunakan kinerja gabungan rangka momen baja dan rangka momen beton bertulang sebagai kesatuan sistem rangka momen. Adanya perbedaan material struktur mempengaruhi pemilihan nilai R (faktor modifikasi respon) untuk perhitungan beban gempa. Nilai R untuk kategori sistem rangka pemikul momen gabungan baja dan beton belum secara eksplisit diatur oleh SNI 1726:2012. Maka dari itu, tulisan ini bertujuan untuk meninjau nilai R serta Ωo (faktor kuat lebih) pada struktur gabungan rangka momen baja sebagai struktur atas dan struktur rangka beton bertulang sebagai struktur bawah. Tinjauan yang dilakukan terbatas pada struktur yang berada pada kondisi kegempaan seperti di Kota Jakarta dengan kondisi Tanah Lunak (SE). Nilai R pada struktur gabungan ditetapkan terlebih dahulu untuk melakukan perancangan elemen struktur. Kemudian dilakukan analisis pushover sehingga diperoleh kurva gaya terhadap deformasi struktur untuk memverifikasi nilai R dan Ωo yang mampu dicapai. Konsep yang dipakai dalam menghitung nilai R dan Wo mengacu ATC-19 dan ATC-34 serta FEMA P-695. Abstract. A significant increasing of the space demand and supported by the applicable regulation especially in the congested areas, give the possibility to extend the building vertically. The extention can be done by adding the steel frame structures above the existing reinforced concrete structures. Thus, the lateral force resting system of the steel and reinforced concrete hybrid structures relies on the acting performance of the steel and concrete moment frames concurrently. This structural material distinction implies the selection of R (Response Modification Factor) value. The R value for hybrid steel-concrete moment resisting frame system has not been stipulated on SNI 1726:2012. Therefore, this paper aims to review the R and Ωo (overstrength factor) value of the hybrid steel-concrete moment resisting frame systems where the steel frames stands above the concrete frames. The review is limited to the structures having similar seismic condition as Jakarta with soft soil condition (Site Class SE). The R value on the hybrid structures is determined prior to structural elements design. Pushover analysis is then performed in order to obtain the load versus deformation curve for the recalculation of R and Ωo. The calculation concept of R and Ωo follows ATC-19 and ATC-34 including FEMA P695.
PENGUKURAN REDAMAN MATERIAL ASPAL CAIR BERDASARKAN PENGUJIAN VISKOSITAS Sandjaya, Arif; Christianto, Daniel; Lase, Yuskar
Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Vol 1, No 2 (2017): Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmstkik.v1i2.1453

Abstract

Bangunan tinggi yang tahan terhadap gempa merupakan kebutuhan struktur masa kini. Oleh karena itu dibutuhkan teknik untuk mengontrol respon dinamik struktur akibat pengaruh gaya lateral, termasuk gaya gempa. Salah satu teknik yang dapat digunakan adalah sistem kontrol struktur pasif dengan memodifikasi massa dan kekakuan maupun dengan menambahkan material peredam. Pada skripsi ini fokus pembahasan adalah mengenai material peredam yang dapat ditambahkan pada struktur dengan menggunakan material aspal Pertamina pen 60/70. Material aspal dipilih sebagai material peredam sehubungan dengan viskositasnya yang tinggi. Viskositas aspal yang tinggi akan memberikan nilai redaman yang besar. Korelasi di antara keduanya menjadi hal yang dianalisis dalam penelitian ini dengan menggunakan model penelitian yang cukup representatif untuk meniru sistem redaman aspal dengan fokusnya pada perilaku aspal terhadap pengujian geser. Penelitian dilakukan terhadap variasi geser pada temperatur ruang. Persamaan yang digunakan dalam memodelkan sistem redaman aspal ini mencakup persamaan Hukum Newton dan persamaan fluida untuk koefisien viskositas yang dihubungkan dengan persamaan dinamik untuk memperoleh batasan nilai redaman aspal. 
Flexible Connection Elastomeric Rubber as a Pounding Resisting Element between Two Adjacent Buildings Lase, Yuskar; Oetomo, James Jatmiko
Makara Journal of Technology Vol. 15, No. 2
Publisher : UI Scholars Hub

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

Abstract

Flexible Connection Elastomeric Rubber as a Pounding Resisting Element between Two Adjacent Buildings To solve pounding problem of two adjacent buildings, structural designer usually employs a dilatation between the structures or make the two structures as a monolith structure. Other alternative is by using an elastomeric rubber as a pounding resisting element between the two structures. Effectiveness in applying elastomeric rubber component as flexible connection of two adjacent structures is the main focus of this paper. Various simulations such as structure models, earthquake excitations and openings in gap element are studied. Observation of maximum structural responses will be performed for structure model with elastomeric rubber in comparison with (1) monolith structure model and (2) structure model with rigid element (steel element). Simulation results show that application of elastomeric rubber component to prevent structures from pounding problem provides advantages especially in reducing internal forces in the shorter building. However, it slightly increases displacement of both structures.
Experimental and Numerical Analysis of Spun Pile-to-Pile Cap Connection with Reinforced Concrete Infill under Cyclic Loading Alfetra Henoch Tandita; Yuskar Lase; Widjojo Adi Prakoso; Mulia Orientilize
Rekayasa Sipil Vol. 16 No. 3 (2022): Rekayasa Sipil Vol.16. No.3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2022.016.03.8

Abstract

Numerical study was conducted by using ABAQUS software to investigate two issues on spun pile connections. The issues are usage of non-shrinkage concrete infill cast inside hollow of pile and ductility. An experimental test was carried out to investigate the effect of two different concrete infill types which were common concrete fc’ 35 MPa and non-shrinkage concrete fc’ 54 MPa. A finite element model was validated against experimental test. The results were compared in terms of hysteresis curve, ductility, and performance level. Ductility is one of the important parameters to describe performance of spun pile connections under seismic load. There are different approaches to calculate ductility and this leads to four different ductility values. Hence, ductility of spun pile with concrete infill is in the range of 3.2 to 4.8. Behavior of spun pile with non-shrinkage concrete infill is slightly improved although the results were almost similar.
Study of Spun Pile to Pile Cap Connection with Steel Jacket Strengthening Hugen, Stevany Lydia Jedidjah; Orientilize, Mulia; Prakoso, Widjojo Adi; Lase, Yuskar
ASTONJADRO Vol. 12 No. 3 (2023): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v12i3.13204

Abstract

Spun piles in Indonesia are designed to behave as an elastic structure according to SNI8460:2017. The piles are designed with low confinement where the amount does not meet ASCE 7-16 requirements. Indonesia should apply a performance-based design for the bottom structure someday since the seismic demand tends to increase based on the current seismic risk map. Steel jackets are proposed to fulfill the need for transverse reinforcement, particularly at the connection region where the curvature demand is higher. The steel jacket was made from high-quality zincalume steel, a high-quality rolled steel that is customizable following the size of the spun pile and has a low cost. Experimental and numerical studies were conducted. A 500mm diameter spun pile was retrofitted with a steel jacket loaded vertically and horizontally. The experimental study applied the cyclic loading according to ACI374.2r, and 0.1fc'Ag vertical load was applied. The experimental study applied the cyclic loading according to ACI374.2r, and 0.1fc'Ag vertical load was applied. The experimental study found that the spun pile and grouted concrete interaction was not perfectly bonded. A further finite element study was conducted to understand the connection's performance thoroughly. Two parameters were investigated, the steel jacket's height and thickness. A numerical study performed pushover analysis on the 3D model using the ABAQUS software to see the effect of the height and moment-curvature analysis obtained from fiber section element from SAP software to study the impact of the thickness. The results were presented in terms of its strength and ductility.
Studi Numerik Sambungan Spun Pile Terhadap Pile Cap Dengan Dan Tanpa Beton Pengisi Akibat Pembebanan Siklik Callista, Vania; Lase, Yuskar; Prakoso, Widjojo Adi; Orientilize, Mulia
Teras Jurnal : Jurnal Teknik Sipil Vol. 12 No. 1 (2022): Volume 12 Nomor 1, Maret 2022
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v12i1.681

Abstract

Abstrak Berdasarkan SNI 8460, spun pile sebagai struktur bawah didesain belum menggunakan konsep performance-based design (PBD) karena pertimbangan sulitnya proses perbaikan, meskipun PBD sudah diperbolehkan di negara lain. Peta gempa tahun 2017 menunjukkan adanya peningkatan seismic demand di Indonesia yang menyebabkan desain fondasi yang tidak efisien jika perilaku inelastic pada pondasi akibat gempa besar tidak diperbolehkan. Untuk mempelajari perilaku inelastic pondasi, tiga sambungan spun pile berukuran full scale diuji dengan pembebanan siklik horizontal. Analisis lanjutan dengan finite element (FE) dilakukan menggunakan Abaqus. Karena kurangnya jumlah tulangan geser (spiral) pada spun pile yang ada di Indonesia, efek confinement dari pemodelan tulangan spiral dibandingkan dengan pemodelan jika spiral disederhanakan sebagai hoops. Analisis FE juga dilakukan untuk mempelajari perbandingan perilaku antara spun pile kosong dan dengan beton pengisi dalam hal kekuatan, daktilitas dan performance levels dari sambungan spun pile.  Kata kunci: sambungan spun pile, performance-based design, the effect of concrete infill, daktilitas                                                   Abstract According to SNI 8640, spun pile as part of lower structure is not designed with the concept of performance-based design (PBD) because of repair issues, although PBD has been allowed for lower structures in other countries. According to the 2017 seismic zone, the increasing seismic demand in Indonesia results in an inefficient foundation design if inelastic behavior of foundation due to a big earthquake is not allowed. Three full scales of spun pile connections were tested with lateral cyclic loading to explore the inelastic behavior of foundation. A finite element (FE) analysis using Abaqus was conducted for further study. Due to low number of spun piles shear reinforcement (spiral) produced in Indonesia, the confinement effect of spiral model is compared with hoops model. Finite element analysis was also done to investigate the behavior difference of hollow spun pile and spun pile with concrete infill in terms of strength, ductility, and performance levels of spun piles connection. Keywords: spun pile connection, performance-based design, the effect of concrete infill, ductility
Numerical Study of Strengthened Spun Pile with Concrete Infill and Steel Jacket Hugen, Stevany Lydia Jedidjah; Lase, Yuskar; Orientilize, Mulia
Rekayasa Sipil Vol. 18 No. 1 (2024): Rekayasa Sipil Vol. 18 No. 1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2024.018.01.9

Abstract

The confinements in a spun pile in Indonesia are below the minimum requirement mentioned in ASCE 7-16. Since Indonesia still adopts the linear elastic concept for foundation design, where the pile should be designed strongly without damage, the deficiency does not matter. However, enormous piles are required to keep it elastically under severe earthquakes. Hence, a transition to performance-based design (PBD) should be prepared since the seismic acceleration tends to increase. PBD requires sufficient transverse reinforcement to ensure flexural failure. Steel jacket is proposed to overcome the lack of confinements, particularly on the pile cap connection where the largest curvature occurs. Experimental and numerical studies have been conducted on a full-scale spun pile-to-pile cap connection with a steel jacket under cyclic loading. A monotonic pushover analysis with Opensees Navigator open-source software was performed for further study.
Co-Authors Alfetra Henoch Tandita Andy Prabowo Arif Sandjaya Callista, Vania Daniel Christianto Hugen, Stevany Lydia Jedidjah James Oetomo James Oetomo, James Oetomo, James Jatmiko Orientilize, Mulia Prakoso, Widjojo Adi