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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Research Report - Engineering Science Rekayasa Sipil Dinamisia: Jurnal Pengabdian Kepada Masyarakat APPLIED RESEARCH ON CIVIL ENGINEERING AND ENVIRONMENT (ARCEE) CRANE: Civil Engineering Research Journal
Helmy Hermawan Tjahjanto
Jurusan Teknik Sipil, Fakultas Teknik Universitas Katolik Parahyangan, Bandung
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Materials Science & Nanotechnology Social Sciences Transportation Other

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DINDING GESER PAPAN KAYU TAHAN GEMPA Johannes Adhijoso Tjondro; Helmy Hermawan Tjahjanto; Herry Suryadi; Andreas Onky; Steven Varian Lokanatha; Nathanael Nathanael
Research Report - Engineering Science Vol. 1 (2011)
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (25343.151 KB)

Abstract

Di Indonesia kebutuhan perumahan sangat besar, rumah kayu menjadi salah satu solusinya.Teknologi tepat guna dalam pembangunan perumahan khususnya rumah kayu kurangditerapkan dalam upaya pengurangan risiko bencana gempa. Dinding geser merupakanelemen struktural bagian dari komponen rumah yang sangat efektif dalam menahan bebanhorisontal gempa maupun angin. Sampai saat ini penelitian tentang dinding geser kayuumumnya dengan lapisan penutup dinding dari panel gipsum atau plywood. Berbeda denganpenelitian-penelitian yang ada, dinding geser dalam penelitian ini terbuat dari rangka balokkayu dan papan-papan pelapis dari kayu dengan alat penghubung paku yang secara teknismudah dikerjakan. Kayu yang digunakan adalah kayu lokal dan cepat tumbuh, seperti sengondan albasia.Penelitian ini meliputi uji eksperimental elemen struktural dinding geser dengan 3 variasidinding geser penuh tanpa bukaan. Tiga macam lapisan penutup digunakan dalam penelitianini yaitu dengan plywood (PBR-SW) dengan rangka berbresing tulangan baja, papan-papankayu (WP-SW) dan papan kayu laminasi-paku silang (CNLT-SW). Kurva histeresis benda ujiPBR-SW dan WP-SW cenderung cocok dengan Degrading Tri-linear Model, sedangkanpada benda uji CNLT-SW lebih menyerupai Stewart Model. Kurva histeresis berdasarkanhasil uji eksperimental elemen dinding geser yang mewakili model dinding geser dapatdigunakan dalam simulasi numerik dengan komputer.Envelope histeresis dari ke 3 macam jenis dinding geser menunjukkan kurva tri-linierterendah adalah pada dinding geser dengan penutup papan kayu, sedangkan tertinggi adalahdengan dinding geser yang menggunakan dinding penutup plywood.
PERENCANAAN STRUKTUR BAWAH (PONDASI) DAN STRUKTUR ATAS PEMBANGUNAN MENARA LONCENG DI PAROKI MARIA RATU PENCINTA DAMAI (MRPD) PONTIANAK, KALIMANTAN BARAT Aswin Lim; Anastasia Sri Lestari; Felix Hidayat; Helmy Hermawan tjahjanto; Herry Suryadi
Research Report - Engineering Science Vol. 1 (2011)
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9.996 KB)

Abstract

Pada makalah ini menyajikan laporan perencanaan struktur bawah (pondasi) dan struktur atas pembangunan menara lonceng di paroki Maria Ratu Pencinta Damai (MRPD) Pontianak, Kalimantan Barat. Makalah ini dibuat untuk menindaklanjuti permohonan dari paroki MRPD Pontianak kepada Universitas Katolik Parahyangan untuk merencanakan sebuah menara lonceng yang akan menjadi monumen khas dari paroki tersebut. Dari hasil perencanaan, struktur bawah (pondasi) dari menara lonceng ini menggunakan pondasi tiang pancang ukuran 20cm x 20 cm dengan panjang bervariasi antara 12 m dan 18 m. Stabilisasi sistem tanah untuk mencegah penurunan berlebih menggunakan cerucuk kayu ukuran diameter 10 cm dengan panjang 10 sampai dengan 12 m. Struktur atas direncanakan menggunakan beton bertulang dengan penggunaan tulangan besi ulir diameter 16 dan besi polos diameter 10 sertamutu beton K-225. Aspek penting dalam perencanaan menara lonceng ini adalah beban angin dan gaya dinamik lonceng, serta karakteristik tanah lunak yang rentan terhadap penurunan. Semua aspek telah diperhitungan, sehingga konstruksi menara lonceng aman dilaksanakan.
Inelastic Behavior of Steel X-Bracings with Back-To-Back Channel Sections: A Numerical Study Tjahjanto, Helmy Hermawan; Livana, Jazlyn; Wisena, Perceka; Wijaya, Paulus Karta
Applied Research on Civil Engineering and Environment (ARCEE) Vol. 5 No. 02 (2024)
Publisher : POLITEKNIK NEGERI JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/arcee.v5i02.7120

Abstract

There are two approaches in determining compression capacity of braces in X-bracing type of concentrically braced frames (CBFs) where the compression braces are connected and interacted with the tension braces. One approach is assuming the effective length factor, K, of the braces to be taken as 0.5, while the other approaches suggest more conservative K values and indicate that the compression braces behavior might be affected by the tension braces and connection plates stiffness. Finite element analyses using ABAQUS are conducted evaluate the nonlinear behavior of X-bracings with back-to-back channel sections with varied slenderness ratio and gusset plates flexural stiffness. From the analytical results, it is found that in all evaluated configurations, yielding in tension braces occurs before buckling of compression braces. Although behave inelastically, the tension braces could act as partial restraints for the compression braces at the intersection points, resulting symmetrical buckling shapes when the compression braces reach their axial capacity. Equivalent effective length factors, which are determined from back calculations based on AISC360-22 formulations for compression members, are ranged from 0.36 to 0.46 and from 0.70 to 0.82, for braces with higher and lower slenderness ratios, respectively. Yielding of gusset plates indicates that the corresponding brace lengths should be measured between the designated fold lines. Gusset plates flexural stiffness could also contribute to the compression capacity of the braces.
Inelastic Behavior of Eccentrically Braced Frames with Vertical Links: A Numerical Study Shendri, Christina Natasha; Tjahjanto, Helmy Hermawan; Nugroho, Wivia Octarena; Pratiwi, Naomi
Rekayasa Sipil Vol. 19 No. 1 (2025): Rekayasa Sipil Vol. 19 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.2025.019.01.8

Abstract

Eccentrically Braced Frames (EBFs) are seismic-resistant steel structures with horizontal or vertical energy-dissipating links designed to enhance ductility. To promote sustainability, future designs are moving toward easily replaceable structural systems that enable rapid post-earthquake rehabilitation. However, EBFs with horizontal links present challenges in repairing damaged links due to interference with other components, particularly beams. As an alternative, vertical links offer the potential to serve as "replaceable elements." Despite this advantage, no specific design guidelines currently address the lateral support requirements for EBFs with vertical links, unlike the horizontal ones. This study analyzes the inelastic behavior of EBFs with vertical links using numerical methods based on the finite element method. The results indicate that vertical link length classification and capacity design methods specified for horizontal links also apply to vertical links. This is evidenced by the shear force values in the three samples representing short, medium, and long links, resulting in values of 2.15Vp, 1.32Vp, and 1.13Vp, respectively, with the shortest link classified as a shear link. The degradations of the horizontal load capacities due to the application of initial deformation, simulating the first buckling mode, are less than 0.01% for all configurations. This verifies that without lateral supports, the vertical links could still effectively dissipate energy through flexural and/or shear yielding without lateral instability issues.
Kajian Numerik Perilaku Sambungan Kayu Geser Tunggal Menggunakan Elemen Balok dan Elemen Solid Wijaya, Naga; Suryoatmono, Bambang; Tjahjanto, Helmy Hermawan
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 2, DESEMBER 2024
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v30i2.61725

Abstract

Modelling single shear wood connection using solid elements is more accurate, especially in simulating the contact between the surface of the lag screw and the surface of the pre-drilled hole, but it is more complicated in terms of geometry and number of nodes. An alternative method is approached by modelling the lag screw as a beam element, with the limitations of modelling the contact interaction between the lag screw and timber members. In this study, diameter variations were also modelled to investigate joint behavior. To validate the model accuracy, a modelling was also performed in which the connectors and timber members were all modelled as solid elements and performed theoretical calculations. Numerical analysis was carried out by modelling the connection specimens using the finite element method in the ABAQUS software. The results showed that the connection capacity between solid element and beam element modelling are quite similar. The accuracy of modelling the lag screw as a beam element is lower at larger diameters and requires a method to correct the results.
EVALUASI NUMERIK DAMPAK KETIDAKSEMPURNAAN PENAMPANG DALAM BATAS TOLERANSI TERHADAP PERILAKU LENTUR DAN GESER BALOK BAJA Tjahjanto, Helmy Hermawan; Hartono, Alvin Krishna; Nugroho, Wivia Octarena
CRANE: Civil Engineering Research Journal Vol 6 No 1 (2025): CRANE
Publisher : Program Studi Teknik Sipil, Fakultas Teknik dan Ilmu Komputer, Universitas Komputer Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/crane.v6i1.15742

Abstract

Kinerja balok baja dalam menahan momen lentur dan gaya geser sangat dipengaruhi oleh geometri penampang dan properti materialnya. Dalam perancangan struktur baja, ketidaksempurnaan geometri penampang dalam batas toleransi umumnya tidak diperhitungkan secara eksplisit, meskipun dapat berkontribusi terhadap perubahan perilaku struktur. Penelitian ini bertujuan untuk mengevaluasi dampak ketidaksempurnaan penampang dalam batas toleransi terhadap kekuatan dan kapasitas deformasi lentur serta geser pada balok baja berpenampang sayap lebar. Kajian dilakukan secara numerik menggunakan perangkat lunak elemen hingga pada model balok kantilever dengan panjang yang berbeda untuk merepresentasikan kegagalan dominasi lentur dan geser. Variasi model mencakup enam tipe ketidaksempurnaan berdasarkan standar JIS G3192:2008. Hasil analisis menunjukkan bahwa ketidaksempurnaan penampang yang menghasilkan bentuk asimetris terhadap sumbu lemah (Tipe-1 dan Tipe-2) dapat menurunkan kapasitas rotasi dan daktilitas lentur balok, sehingga tidak dapat digunakan sebagai bagian dari sambungan balok kolom Rangka Momen Khusus sesuai SNI 7860:2020. Selain itu, kedua tipe ketidaksempurnaan ini (Tipe-1 dan Tipe-2) dan ketidaksempurnaan pelat badan web yang tidak lurus (Tipe-6) menurunkan kapasitas deformasi geser balok, hingga 7% di bawah kekuatan geser nominal penampang. Temuan ini mengindikasikan bahwa meskipun berada dalam batas toleransi, ketidaksempurnaan geometri penampang dapat berpengaruh terhadap performa struktur.
Landslide Treatment in the Al-Husainiyyah Junior High School Area using Cantilever-Geofoam Wall: Penanganan Longsor di Lingkungan SMP Al-Husainiyyah dengan Menggunakan Dinding Kantilever-Geofoam Lim, Aswin; Pratama, Ignatius Tommy; Widjaja, Budijanto; Tjahjanto, Helmy Hermawan; Tjondro, Johannes Adhijoso; Wijaya, Obaja Triputera; Ginting, Bobby Minola; Setiawan, Theresita Herni; Adianto, Yohanes Lim Dwi; Hidayat, Felix; Hartieni, Patricia; William, Octavianus; Aldrianita, Tabitha; Fadhil, Imam Ahmad
Dinamisia : Jurnal Pengabdian Kepada Masyarakat Vol. 8 No. 4 (2024): Dinamisia: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/dinamisia.v8i4.19519

Abstract

A landslide triggered by heavy rainfall occurred in the Al-Husainiyyah Junior High School area on April 26th, 2023. The landslide damaged the nearby access roads, the existing retaining wall, and a futsal court threatening the safety of the teachers and students in conducting the learning activities that especially require open areas. Thus, this community service aims to provide a cantilever wall design with geofoam as an innovative lightweight backfill material to reinforce the slope and repair the damaged structures. Field surveying and numerical analysis were then conducted to understand the current slope and soil conditions and to analyze the stability of the slope and retaining wall. The results show that a cantilever wall with a total height of 1.8 m supported by a strauss pile row with a diameter of 0.4 m, 4 m in length, and 2.5 m in spacing could increase the stability of the slope.
Co-Authors Aldrianita, Tabitha Anastasia Sri Lestari Andreas Onky Aswin Lim Bambang Suryoatmono Bobby Minola Ginting Budijanto Widjaja Fadhil, Imam Ahmad Felix Hidayat Hartieni, Patricia Hartono, Alvin Krishna Herry Suryadi Ignatius Tommy Pratama Johannes Adhijoso Tjondro Livana, Jazlyn Nathanael Nathanael Nugroho, Wivia Octarena Paulus Karta Wijaya Shendri, Christina Natasha Steven Varian Lokanatha Theresita Herni Setiawan Wijaya, Naga Wijaya, Obaja Triputera William, Octavianus Wisena, Perceka Yohanes Lim Dwi Adianto