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All Journal Inersia : Jurnal Teknik Sipil dan Arsitektur MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Sipil Jurnal Teknik Sipil dan Perencanaan Jurnal Transportasi Jurnal HPJI (Himpunan Pengembangan Jalan Indonesia) Semesta Teknika Dinamika Teknik Sipil Astonjadro JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Makara Journal of Technology
Suprapto Siswosukarto
Universitas Gadjah Mada Yogyakarta
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Perilaku Lentur Panel Beton Semi-Precast pada Daerah Lapangan Tanpa Metode Perkuatan Elemen Pracetak: Tinjauan pada 1, 2 dan 3 Panel Khoiroh, Umi; Siswosukarto, Suprapto; Supriyadi, Bambang
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
Publisher : Jurnal Semesta Teknika

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

Abstract

A slab where only the lower portion of the floor slab is prefabricated and receives the top layer of floor slab which is cast in situ, in the context of this research is called semi-precast. For small projects, the transportation, storage, and installation of precast units can be a problem. There will be more problem if it is located in congested urban area. For this reason, precast slab panel system in smaller size and weight was introduced. The precast concrete element which is has a rough surface was predicted capable to act as composite, although no shear reinforcement method was used. The objective of this research is to study the characteristic behavior of semi-precast panel without shear reinforcement method on its interface. The characteristic investigated includes flexural capacity, stiffness, ductility, and failure mode of the slab. In this study, the specimens were divided into two groups. The first group is monolith slab that consists of one, two, and three panel(s). Each panel has 120 mm thickness, 3000 mm span length, and 200 mm width of concrete slab. The second group is semi-precast slab that consists of one, two, and three panel(s). Each panel has 70 mm thick precast slab that serves as formwork for 50 mm in situ concrete layer, to form a 120 mm thick of concrete slab. Dimension and shape between semi-precast and monolith slabs are identical. All specimens were tested under static load and failure load. Experimental results revealed that the stiffness of semi-precast slabs is lower than the monolith slab. More number of panels reduced stiffness differences between semi-precast and monolith slab. It also increases the value of stiffness and flexural capacity of the slabs. The failure mode and crack pattern is classified as flexure. Existence of interface plane which is using no shear reinforcement method can decrease the value of stiffness and flexural capacity of the slab. From the results, it is shown that the slip occurred on the semi-precast slab’s interface. It is predicted that the slip was due to the influence of no shear reinforcement on the interface.
Analisa Kekuatan Tahanan Lateral Pada Sistem Komposit LVL Kayu Sengon dan Beton Pracetak Tantisaputri, Intan Archita; Awaludin, Ali; Siswosukarto, Suprapto
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 25, Nomor 2, DESEMBER 2019
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1947.564 KB) | DOI: 10.14710/mkts.v25i2.23068

Abstract

LVL Sengon and concrete can be used to form a composite structure of the floor system. Connections between LVL Sengon and concrete on this composite floor system are the weakest part so that a majority of structural damages are concentrated at these joints. This study discusses the lateral resistance of lag screw joints in a composite system of LVL Sengon and precast concrete. The lateral joint resistance was evaluated through quasi-static loading upon double shear test specimens having two screws at every single shear. Variation of the specimens includes precast concrete compressive strength of 20.71 MPa and 25.29 MPa, screw diameter of 6 mm length 101.6 mm and 8 mm length 101.6 mm and 127 mm, and angle of lag screw axis against the wood fiber of 60° and 90°. The result shows that lateral resistance of the test is greater than that of EYM, SNI, and EC5 predictions. Joint failure in this experiment is due to failure in wood fiber along with the occurrence of one up to two plastic hinges in the screw.
Tinjauan Perilaku Dinamik Balok T dengan Perkuatan CFRP Jenis Wrap (Studi Eksperimental, Balok Beton Bertulang) Muda, Johanes B; Supriyadi, Bambang; Muslikh, Muslikh; Siswosukarto, Suprapto
Dinamika Teknik Sipil: Majalah Ilmiah Teknik Sipil Vol. 13/No.2/Desember 2020
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1122.971 KB) | DOI: 10.23917/dts.v13i2.13056

Abstract

Penggunaan CFRP sebagai pilihan dalam revitalisasi komponen struktur saat ini sangat banyak digunakan dan di kembangkan. Penggunaan CFRP bertujuan untuk meningkatkan kapasitas lentur dan geser balok, namun pada penerapannya penambahan CFRP berpengaruh terhadap perubahan kekakuan dan pola keruntuhan balok tersebut. Perilaku dinamik dari komponen struktuktur dalam penelitian ini digambarkan oleh nilai frekuensi alami komponen struktur dalam pengujian lentur dan geser. Penelitian ini menggunakan enam buah benda uji yaitu tiga benda uji balok T dengan perkuatan CFRP wrap pengujian lentur (BC1, BFR1, BFR2) dan tiga benda uji balok T dengan perkuatan CFRP wrap pengujian geser (BCg, BC1g, BC2g). Dari hasil pengujian, penambahan perkuatan CFRP meningkatkan nilai frekuensi alami benda uji BFR1 , BFR2, BC1g, BC2g  berturut-turut sebesar 41.29%, 42.86%, 10.34%, 15%. Peningkatan frekuensi alami ini juga divalidasi dengan adanya peningkatan kekakuan benda uji BFR1 , BFR2, BC1g, BC2g   berturut-turut sebesar 2.08%, 20.50%, 65.68%, 107.2%. Dari hasil pengujian lentur benda uji tanpa perkuatan (BCl) mengalami penurunan nilai frekuensi dari kondisi awal ke kondisi runtuh sebesar 29.8%, lebih besar dari benda uji dengan perkuatan BFR1 (10.33%) dan BFR2 (20.13%). Sedangkan  pada pengujian geser benda uji tanpa perkuatan (BCg) mengalami penurunan nilai frekuensi dari kondisi awal ke kondisi runtuh sebesar 9.58%, lebih besar dari benda uji dengan perkuatan BC1g (7.10%) dan BC2g (6.74%).  Dari data hasil pengujian ini dapat disimpulkan bahwa terdapat peningkatan nilai frekuensi alami balok T dan penambahan kekakuan balok T akibat adanya penambahan perkuatan CFRPwrap pada balok T yang mana dalam kondisi awal hanya bertujuan untuk meningkatkan kapasitas lentur dan geser balok T tersebut.
Perilaku Rangka Open Web Truss Joist LVL Sengon Basuki, Achmad; Awaludin, Ali; Suhendro, Bambang; Siswosukarto, Suprapto
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 27, Nomor 1, JULI 2021
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (141.817 KB) | DOI: 10.14710/mkts.v27i1.31916

Abstract

Laminated Veneer Lumber (LVL) Sengon is classified as one of the engineering products having a significant increase of both physical and mechanical properties compared with Sengon solid wood. Considering its short planting years and sustainable production, Sengon wood is very potential to be used as construction materials of low-rise houses to support the housing needs in Indonesia. Creep behaviour of LVL Sengon material is one of the mechanical properties that needs to be considered. This article evaluated value of creep factor of the open web truss joist (OWTJ) LVL Sengon test and compared this experimental creep factor with the numerical results developed by FE model taking into account the viscoelastic parameters of authors' previous study. The viscoelastic parameters were based on a 217-day creep test of compression and tension parallel to the grain of LVL Sengon at 20 % of stress level that were further modeled using Prony series creep model having n equals to 3. The reduction in the modulus of elasticity over time resulted in creep deflection and creep factor values at 217 days of testing results and FE numerical analysis of the OWTJ LVL Sengon ranging from 1.50–1.54; while the predicted creep factor at 25 years of service life is 1.57 or greater than the creep factor value provided in SNI 7973: 2013 of 1.5.
Lateral Load Resistance of Laminated Veneer Lumber Sengonwooden Joints with Wooden Dowels Palaeowati, Niken; Awaludin, Ali; Siswosukarto, Suprapto
Makara Journal of Technology Vol. 18, No. 3
Publisher : UI Scholars Hub

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Abstract

Analytical models for wooden-doweled joints need to be developed. The objective of this research is to determine whether the strength of wooden-doweled joints can be well predicted by equations developed for steel-doweled joints. In this experiment, various connection parameters, such as dowel diameter, species of the wooden dowel, and angle of joints, are studied. The joint specimens are loaded in a quasi-static state with four replications each. A5% offset diameter method is used to determine the lateral load resistance of the tested joints, while the predictions are evaluated by equations given in Indonesian National Standard (SNI) 7973-2013 and the European Yield Model (EYM). The results show that experimental lateral resistance is greater than that of the SNI prediction and is between the EYM prediction of elastic and the plastic conditions of the wooden dowel. Lateral load resistances given by the SNI and the elastic condition EYM are around 64.53% and 78.45% of the experimental result, respectively. In contrast to steeldoweled joints, the ductility coefficient of wooden-doweled joints increases as the dowel diameter increases. This is potentially due to the axial stiffness of the wooden dowels being relatively smaller than that of the wood member. Joint failure occurs due to plastic bearing deformation in the wood member surrounding the dowel, followed by the formation of two plastic hinges in the wooden dowel.
PENGARUH PENGGUNAAN ZEOLITE ALAM SEBAGAI PENGGANTI MINERAL FILLER PADA CAMPURAN LAPIS FONDASI AGREGAT KELAS A Pasapan, Richard Marcelenus; Suparma, Latif Budi; Siswosukarto, Suprapto
Jurnal HPJI (Himpunan Pengembangan Jalan Indonesia) Vol. 10 No. 2 (2024)
Publisher : Himpunan Pengembangan Jalan Indonesia (HPJI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26593/jhpji.v10i2.8377.85-96

Abstract

Abstract Premature damage to road pavement can be caused by several factors, including the use of materials that do not meet specifications dan uneven density in the base layer. To overcome this problem, innovative solutions are needed. The use of natural zeolite powder as a substitute for filler in road structural layers is an interesting innovation in the construction industry. This study aims to evaluate the effect of natural zeolite powder on the mechanical dan technical properties of Grade A Aggregate Base Course. Through an experimental approach, standard mixtures of Grade A Aggregate Base Course were compared with mixtures using varying levels of natural zeolite powder, ranging from 0% to 100%. The testing procedures carried out follow the Indonesian National Standard procedures dan include examining the characteristics of the materials used dan testing the density of the mixture. This study shows that increasing the zeolite powder content leads to a decrease in the maximum dry density value, while the Optimum Moisture Content value increased. Keywords: road pavement; Zeolite; base course; Optimum Moisture Content; maximum dry density Abstrak Kerusakan prematur pada perkerasan jalan dapat disebabkan oleh beberapa faktor, termasuk penggunaan bahan yang tidak memenuhi spesifikasi dan kepadatan yang tidak merata pada lapisan dasar. Untuk mengatasi masalah ini diperlukan solusi inovatif. Penggunaan bubuk zeolite alam sebagai pengganti filler pada lapisan struktur jalan merupakan salah satu inovasi yang menarik dalam industri konstruksi. Penelitian ini bertujuan untuk mengevaluasi pengaruh bubuk zeolite alam terhadap sifat-sifat mekanik dan teknis Lapis Fondasi Agregat Kelas A. Melalui pendekatan eksperimental, campuran standar Lapis Fondasi Agregat Kelas A diban-dingkan dengan campuran menggunakan variasi kadar bubuk zeolite alam, mulai dari 0% hingga 100%. Prosedur pengujian yang dilakukan mengikuti prosedur Standar Nasional Indonesia serta meliputi pemeriksaan karakteristik material yang digunakan dan pengujian kepadatan campuran. Hasil yang didapat menunjukkan bahwa peningkatan kadar bubuk zeolite mengakibatkan penurunan nilai kepadatan kering maksimum, semen-tara nilai Kadar Air Optimum mengalami peningkatan. Kata-kata kunci: perkerasan jalan; Zeolite; lapis fondasi; Kadar Air Optimum; kepadatan kering maksimum
PENENTUAN KONDISI PERKERASAN KAKU DI JALAN RINGROAD SELATAN YOGYAKARTA DENGAN METODE PAVEMENT CONDITION INDEX Sari, Ardystia Maha; Suparma, Latif Budi; Siswosukarto, Suprapto
Jurnal HPJI (Himpunan Pengembangan Jalan Indonesia) Vol. 10 No. 2 (2024)
Publisher : Himpunan Pengembangan Jalan Indonesia (HPJI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26593/jhpji.v10i2.8382.141-152

Abstract

Abstract Roads are land transportation infrastructure that has an important role in the economic, tourism, social, and cultural growth of a region. As its service life progresses, roads experience damage, especially due to traffic loads. In this study, road pavement damage was observed visually and the condition of the road pavement was determined using the Pavement Condition Index Method (ASTM D6433-11). The locations of this study are several intersections located on Jalan Ringroad Selatan, Yogyakarta, namely Madukismo Intersection, Dong-kelan Intersection, Druwo Intersection, Wojo Intersection, and Giwangan Intersection. This study shows that the average value of the Pavement Condition Index on the roads observed is 89, which means that the road pavement is in good condition. Keywords: road; road pavement; traffic load; road damage; Pavement Condition Index Abstrak Jalan merupakan prasarana transportasi darat yang memiliki peran penting dalam pertumbuhan ekonomi, pariwi-sata, sosial, dan budaya suatu daerah. Seiring dengan umur layanannya, jalan mengalami kerusakan, khususnya akibat beban lalu lintas. Pada studi ini, kerusakan perkerasan jalan diamati secara visual dan kondisi perkerasan jalan ditentukan dengan menggunakan Metode Pavement Condition Index (ASTM D6433-11). Lokasi peneli-tian ini adalah beberapa simpang yang terletak di Jalan Ringroad Selatan, Yogyakarta, yaitu simpang Madukismo, Simpang Dongkelan, Simpang Druwo, Simpang Wojo, dan Simpang Giwangan. Studi ini menunjukkan bahwa nilai rata-rata Pavement Condition Index di jalan yang diamati adalah 89, yang berarti perkerasan jalan berada pada kondisi baik. Kata-kata kunci: jalan; perkerasan jalan; beban lalu lintas; kerusakan jalan; Pavement Condition Index
The Effect of Polypropylene Fiber and Steel Fiber on Geopolymer Concrete Widiana, Niza; Satyarno, Iman; Siswosukarto, Suprapto
Jurnal Teknik Sipil dan Perencanaan Vol 25, No 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v25i1.40999

Abstract

One of the environmentally friendly concrete as an alternative to cement concrete in the future is geopolymer concrete which used a cement substitute in the form of fly ash. To prevent premature cracking of the concrete, this study added fiber types such as polypropylene fiber, and steel fiber (dramix), this experiment with 3 variables namely the addition of polypropylene fiber by 0%, 0.40%, 0.80%, 1.2%, steel fiber of 0.25%, 0.50%, 0.75%, 1.00%, as well as a combination of polypropylene fiber and steel fiber (0.4%P;0.50%D), (0.8%P;0.75%D), (1.2%P;1.00%D) of the weight of the concrete. In this study, using a beam specimen measuring 10x10x50 cm, for each percentage of fiber usage there are 2 beam trials. Geopolymer concrete in this study uses a ratio of NaOH and Na2SiO3 is 2:1 and a constant concentration of 10 Molar, to test the Flexural Strength Test of Concrete at the age of 28 days of concrete. The results of the highest average flexural strength of geopolymer concrete without fiber σl = 78.77 kg/cm2, using polypropylene 0.80% σl =50.50 kg/cm2, and 0.25% steel fiber σl =68.87 kg/cm2, the combination of both fibers (P0.4%; D0.25%) σl =65.34 kg/cm2. These results do not produce good workability, thus affecting the decrease in flexural strength. By increasing the ratio A = 0.35 to 0.45, the geopolymer concrete mix produces better workability with the highest average flexural strength of geopolymer concrete with polypropylene fiber 0.8% σl = 80.107 kg/cm2.
ANALISIS PENGARUH PELATIHAN KONSTRUKSI TERHADAP PENINGKATAN KOMPETENSI TENAGA KERJA KONSTRUKSI Asman, Hasbi; Siswosukarto, Suprapto; Pratiwi, Endita Prima Ari
JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Vol 7, No 2 (2023): Volume 7 No 2 Tahun 2023
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ju.v7i2.1215

Abstract

The strategic issue confronting the Indonesian construction services sector is the low level of ownership of Construction Work Competency Certificates (SKKK). Construction workforce development policies are concentrated on enhancing the competence of the construction workforce through training, with the aim of enabling them to perform work effectively and efficiently. Every aspect and stage of construction training is crucial; therefore, it is imperative to assess the effectiveness of construction training. This research addresses the measurement of construction training effectiveness by identifying and evaluating the factors and indicators that influence its effectiveness. The object under examination is a vocational training program in construction at the Medan Vocational and Productivity Training Center, specifically focusing on surveyor and building drafter job positions. This research evaluates the outcomes of the training program and assesses the four levels of Kirkpatrick's model criteria: reaction, learning, behavior, and results to find out what factors affect the effectiveness of training in increase human resources in construction services. Quantitative descriptive research method with data collection by distributing questionnaires to alumni training participants and superiors. Statistical analysis was carried out to determine the effect of construction training on increasing the competence of the trainees. Meanwhile, an analysis of the level of effectiveness was carried out to determine the interpretation value of the factors and measurement indicators by Relative Importance Index (RII) method. The results revealed a significant impact of construction training on improvement the competence of the trainees. The categorical factors and indicators exhibited a level of influence on improving knowledge, skills, attitudes, and performance, as indicated by the reaction level producing an RII value of (88,29%), learning (87,17%), behavior (88,75%), and results (87,19%). Precondition factors and indicators should be taken into consideration to ensure that the training yields effective results. Concepts related to the types of training and the factors that enhance training effectiveness necessitate robust decisions to steer the behavior and performance of trainees in a more favorable direction.
PENGARUH SUBSTITUSI BAHAN PENGISI NANO HYDRATED LIME TERHADAP PERANCANGAN CAMPURAN ASPHALT CONCRETE-WEARING COARSE Syawal, Jus; Suparma, Latif Budi; Siswosukarto, Suprapto
Jurnal Transportasi Vol. 23 No. 1 (2023): Jurnal Transportasi
Publisher : Forum Studi Transportasi antar Perguruan Tinggi (FSTPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26593/jtrans.v23i1.6646.37-44

Abstract

Abstract Asphalt Concrete-Wearing Coarse (AC-WC) is the top layer of a flexible pavement structure. As a road surface layer, the AC-WC coating is very susceptible to moisture damage due to weather influences. Therefore, the use of hydrated lime has been widely studied to improve the performance of asphalt pavements. In this study, the use of hydrated lime, with a finer size or nano scale, is used as a substitute for filler in the AC-WC mixture, with the aim of evaluating the use of nano hydrated lime as a substitute for filler in the AC-WC mixture. This study shows that the use of nano hydrated lime filler substitution in the AC-WC mixture increases the optimum asphalt content value of the mixture along with the addition of nano hydrated lime. Keywords: flexible pavement; nano-hydrated lime; quenched lime; fillers; asphalt pavement Abstrak Asphalt Concrete-Wearing Coarse (AC-WC) merupakan lapisan paling atas dari struktur perkerasan lentur. Sebagai lapis permukaan jalan, lapisan AC-WC sangat rentan terhadap kerusakan akibat kelembaban karena pengaruh cuaca. Oleh karena itu, pemanfaatan kapur padam (hydrated lime) telah banyak diteliti untuk meningkatkan performa perkerasan beraspal. Pada penelitian ini pemanfaatan hydrated lime, dengan ukuran yang lebih halus atau dengan skala nano, dimanfaatkan sebagai subtitusi bahan pengisi pada campuran AC-WC, dengan tujuan untuk mengevaluasi penggunaan nano hydrated lime sebagai subtitusi bahan pengisi pada campuran AC-WC. Studi ini menunjukkan bahwa penggunanaan subtitusi bahan pengisi nano hydrated lime pada campuran AC-WC meningkatkan nilai kadar aspal optimum campuran seiring dengan penambahan nano hydrated lime. Kata-kata kunci: perkerasan lentur; nano hydrated lime; kapur padam; bahan pengisi; perkerasan beraspal
Co-Authors Achmad Basuki Ali Awaludin Aminullah, Akhmad Arianto, Niky Ashar Saputra Asman, Hasbi Bambang Suhendro Bambang Supriadi Bambang Supriyadi Endita Prima Ari Pratiwi Iman Satyarno Latif Budi Suparma Lautan Wijaya Nusantara, Johan Muda, Johanes B Muslikh Muslikh Niken Palaeowati Pasapan, Richard Marcelenus Purba, Ronny Rosediana, Risky Andayani Sari, Ardystia Maha Sari, Halima Irianti Puspita Syawal, Jus Tantisaputri, Intan Archita Tuasikal, Nur Risa Cahyana Umi Khoiroh, Umi Widiana, Niza Yobelita, Naomi Yuhasnita, Angeline