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All Journal Journal of the Medical Sciences (Berkala Ilmu Kedokteran) Semesta Teknika Dinamika Teknik Sipil Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Riset Rekayasa Sipil Inersia : Jurnal Teknik Sipil Journal of the Civil Engineering Forum
Bambang Supriyadi
Departemen Teknik Sipil Dan Lingkungan, Universitas Gadjah Mada, Yogyakarta
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Immunology & microbiology Neuroscience

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Perilaku Geser pada Keadaan Layan dan Batas Balok Beton Bertulang Berlubang Memanjang Wiku A Krasna; Djoko Sulistyo; Bambang Supriyadi
Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jst.v13i2.715

Abstract

I cross-section of reinforced concrete reduces weight and concrete needs, but the reduction in strength is not considerably large. In addition, I section reinforced concrete beam is relatively complicated and takes much longer time for manufacturing. Another geometric cross-section which results in equivalent weight reduction with that of I cross-section concrete beam may be hollow square crosssections of reinforced concrete beams. This research was conducted to identify and compare the behavior of the shear and dynamic effects of hollow core reinforced concrete beam with an I cross-section beam that equivalent with its. The specimens being tested were four reinforced concrete beams, of 2000 mm length, consisted of a T beam with bottom flange as control beam (BK) possessing dimensions of bfa = 600 mm, bw = 125 mm, bfb = 200 mm, h = 300 mm, tf = 100 mm, and three hollow core T beams as tested beam (BB1, BB2 and BB3) possessing dimensions of bf = 600 mm, bw = 200 mm, blubang = 75 mm h = 300 mm, tf = 100 mm. Static loading was applied by means of a hydraulic jack in a four-point loading system, were. Dynamic loading test was carried out by vibrating the beams to obtain the natural frequency, where the vibrating load were produced by a mechanical vibrator. Whilst the data on the static load carrying capacity was recorded at the first crack and at each initial additional crack until the ultimate fracture, those on dynamic loading was recorded on the solid block, at the first crack and at yield. The parameters being used was the magnitude of deflection, strain of the reinforcing steel and concrete, crack pattern and natural frequency. It can be concluded that the hollow core reinforced concrete beam can be used as an alternative to I section reinforced concrete beam. It was noticed that the difference in shear load carrying capacity between control beam (BK) and hollow beam (BB) was not considerably significant, where the difference between BK (299.3 kN) and BB1 (337.6 kN) is 12.79%, that with BB2 (350, 6 kN) or 17.14%, and that with BB3 (289.4 kN) or −3.31%. The natural frequency of BK is 58.594 Hz, 15.769% larger than the natural frequency of BB3 with 49.354 Hz. The natural frequencies of tested beam decreased with the increased of damage to the beam.
Perilaku Lentur Panel Beton Semi-Precast pada Daerah Lapangan Tanpa Metode Perkuatan Elemen Pracetak: Tinjauan pada 1, 2 dan 3 Panel Umi Khoiroh; Suprapto Siswosukarto; Bambang Supriyadi
Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jst.v12i2.730

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.
Tinjauan Perilaku Dinamik Balok T dengan Perkuatan CFRP Jenis Wrap (Studi Eksperimental, Balok Beton Bertulang) Johanes B Muda; Bambang Supriyadi; Muslikh Muslikh; Suprapto Siswosukarto
Dinamika Teknik Sipil: Majalah Ilmiah Teknik Sipil Vol. 13/No.2/Desember 2020
Publisher : Departement of Civil Engineering, Faculty of Engineering

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 LENTUR PELAT KOMPOSIT DENGAN PENGKASARAN INTERFACE PADA MOMEN KAPASITAS LAPANGAN Agustin Gunawan; Suprapto Siswosukarto; Bambang Supriyadi
Inersia: Jurnal Teknik Sipil Vol 4, No 1 (2012)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (741.384 KB) | DOI: 10.33369/ijts.4.1.1-16

Abstract

The research aimed at investigating of the influence of surface roughing at semi-precast slab to slab strength on the first crack and the ultimate, the slab strength ratio made monolithically and composite, and to investigate crack and failure pattern of composite slab. The testing was conducted on two groups of slab which has 1:1 scales. Each group consists of three. The first group was monolith slab as control speciment. The second group was composite slab withsurface roughing. The test was conducted on two step. The first step, speciment was loaded by the repeated center static loading (10 cycle), the second step, the speciment was loaded from zero and increased step by step until speciment failed. Testing results showed that the first crack load of composite slab was approximately 14,2 % (width of 200 mm), 10,61 % (width of 400 mm), and 22,64 % (width of 600 mm) less than monolith slab. The ultimate (failure) load of composite slab was about 32,2 % (width of 200 mm), 9,8 % (width of 400 mm), and 15,9 % (width of 600 mm) less than monolith slab. The cracks occurred at slab speciment was vertical cracks extending through tensile side. The crack was indicated flexural crack, while the kind of failure type occurred at slab speciment was flexural failure.
EVALUASI SEISMIK GEDUNG BERTINGKAT EKSISTING MENGGUNAKAN PROSEDUR ASCE 41-17 Yuliar Azmi Adhitama; Bambang Supriyadi; Bambang Suhendro
Jurnal Riset Rekayasa Sipil Vol 6, No 1 (2022): September 2022
Publisher : Civil Engineering Study Program, Engineering Faculty Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (994.022 KB) | DOI: 10.20961/jrrs.v6i1.65864

Abstract

Gedung XYZ merupakan gedung beton bertulang 5 lantai dengan proses perencanaan ketahanan gempa gedung menggunakan standar SNI 1726:2002, sedangkan saat ini berlaku standar perencanaan ketahanan gempa yang baru mengacu pada SNI 1726:2019. Perubahan peta gempa dan cara perancangan spektra desain menjadikan proses evaluasi ketahanan gempa menjadi menarik untuk diteliti sehingga dapat mengetahui kinerja struktur bangunan. ASCE 41-17 adalah standar yang diterbitkan oleh American Society of Civil Engineers mengatur evaluasi seismik dan evaluasi perbaikan bangunan eksisiting. Proses evaluasi berdasarkan data sekunder asbuilt drawing yang dianalisis menggunakan prosedur statik nonlinier (pushover) dengan program SAP2000. Hasil analisis struktur ditinjau secara global, Gedung XYZ mampu menahan gaya lateral sampai pada displacement target dan memenuhi target kinerja Immediate Occupancy untuk seismic hazard BSE-1E dan target kinerja Life Safety untuk seismic hazard BSE-2E. Distribusi sendi plastis terjadi pada balok terlebih dahulu, sehingga memenuhi prinsip strong column weak beam. Namun jika dilihat lebih detail, balok G2 tidak memenuhi persyaratan ketika dievaluasi menggunakan metode statik nonlinier dengan koefisien gc (DCR 1,14) dan jika tidak dikalikan koefisien gc balok tersebut masih memenuhi syarat dengan (DCR 0,91). Kapasitas kolom dalam menerima demand secara keseluruhan memenuhi syarat dengan rasio kurang dari 1. Setiap jenis kolom memenuhi syarat baik ketika demand tidak dikalikan dengan koefisien gc maupun setelah dikalikan dengan koefisien gc.
Dynamic Properties Comparison of 1D, 2D, and 3D Model for Concrete Box-Girder Bridge of 40-meter Span Wira Sucitra Ibrahim; Akhmad Aminullah; Ali Awaludin; Bambang Suhendro; Bambang Supriyadi; Renga Rao Krishnamoorthy
Journal of the Civil Engineering Forum Vol. 8 No. 3 (September 2022)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.4148

Abstract

Concrete box-girder structure is considered the thin-walled structure, undergoing deformation and forces, as well as having structural rigidity in three dimensional directions. However, it’s commonly modeled as 1D structure for the sake of design practicality, which influences the numerical result of its dynamic properties when compared to both real time SHMS and field test result. To see how far the difference of the dynamic properties between 1D, 2D, and 3D model of concrete box-girder structure, the concrete box-girder structure is modeled as 1D (frame), 2D (shell), and 3D (solid) element with MIDAS Civil 2019. Considering the allowable deflection and stress limited by design code, concrete box-girder structure is modeled and analyzed as linearly elastic material. The dynamic properties obtained from these 3 models were compared with those obtained from real time SHMS and field test. These results indicate that both natural frequency and period of 2D and 3D models are close to those of real time SHMS and field test. However, the natural frequency of 1D model is slightly larger than the real SHMS and field test, indicating that 1D model gives the slightly overestimate natural frequency and structural rigidity compared to the reality. Unlike 2D and 3D model, the structure is accounted to have the uniform sectional rigidity along transversal direction in 1D model. This is why 1D model seems to have higher structural rigidity compared to 2D and 3D model, which subsequently yields the higher natural frequency than 2D and 3D model. This research proves that the designers’ discretion is advised if 1D model is used for the sake of design practicality.
Effect of Creep on The Long-Term Deflection of Box Girder Balanced Cantilever Bridge Structure Using B3 Model and CEB 2010 Luki Hariando Purba; Bambang Supriyadi; Bambang Suhendro
Journal of the Civil Engineering Forum Vol. 9 No. 1 (January 2023)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.4905

Abstract

Creep significantly affects the long-term deflection of the prestressed concrete bridge structure. Some models often used in predicting creep do not consider the water-cement ratio. The water-cement ratio is a factor in the magnitude of creep. If the water-cement ratio is excessive, the creep will also be significant. B3 Model uses the water-cement ratio in predicting creep in prestressed concrete bridge structures and has provided good accuracy with measured deflection data. This study compares B3 Model with Model CEB 2010 to predict the effect of creep on the long-term deflection. The author modeled the bridge structure using Midas Civil 2022 v1.2 software by utilizing the construction stages analysis facility to idealize the balanced cantilever and the effect of creep on the long-term deflection. Envelope displacement of bridge B3 Model is more significant than CEB 2010. The prediction deflection of the B3 Model in 100 years of service life of the bridge is -16.34 cm, while CEB 2010 is -11.90 cm. Creep affects total deflection by 84% to 88%. Creep affects the deflection significant because, in the construction process, each box girder segment is stressed and loaded at the age of 3 days. At the age of 3 days, the elastic modulus of the concrete is still not entirely, and the cement paste on the concrete is still in the hydration process. The results showed a significant difference between B3 Model and CEB 2010. B3 Model predicts that the long-term deflection of the bridge until the end of the bridge's service life is 44% to 49% greater than the CEB 2010 model. Prediction of total deflection until the end of 100 years of bridge service life does not exceed the limit determined by SNI and CEB codes.
Pathological fracture in fibrous dysplasia: a case report Bambang Supriyadi
Journal of the Medical Sciences (Berkala Ilmu Kedokteran) Vol 54, No 3 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19106/JMedSci005403202210

Abstract

Fibrous dysplasia (FD) is described as a growth disorder characterized by the progressive replacement of normal bone elements by fibrous-osseus tissue. Bones affected by FD is presented with bone weakening and prone to pathological fracture. We reported a case of FD in an 8-years-old boy, who came to the hospital with pain in the upper right thigh after falling with bumps in his head and foot. An X-ray revealed a deformity as a diasteal scalloping with radiolucency lesions on one-third proximal of the right upper femur, greater trochanter, and lesser trochanter, with complete transverse discontinuity in the distal deformity. No similar lesion was found in the other bones. Bone structure and trabeculation in the deformity area has decreased and the cortex was thinning. On magnetic resonance imaging (MRI), bone size was enlarged, hypointense on T1WI and inhomogeneous hyperintense on T2WI. Fibrous dysplasia with a pathological fracture is a rare case. The appearance on the X-ray was diasteal scalloping with a ground-glass radiolucency represented with Shepherd's crook deformity. This lesion was accompanied by a pathological fracture (fragility fracture) on distal lesion. Fibrous dysplasia which characterized by bone developmental anomaly gave an inhomogeneous hypointense on T1W1 and hyperintense on T2WI.
Prevention, Identification, and Management of Stunting through Health Education and Entrepreneurial Capacity Building in Argomulyo Village, Sleman, Yogyakarta Torana Kurniawan; Yana Supriatna; Sri Dwidanarti; Lina Choridah; Anita Ekowati; Wigati Dhamiyati; Bambang Supriyadi; Mohammad Rizki Pratama; Abdi Alhaq
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 9, No 3 (2023): September
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpkm.83779

Abstract

Stunting is one of the world’s most serious public health issues, with significant morbidity rates, especially in Indonesia. Low public awareness of stunting and low family income are two major causes discovered especially in Special District of Yogyakarta. This community service project was undertaken to address this issue. Following the completion of the situation analysis and problem identification, a community-based problem-solving strategy in the form of health and entrepreneurship education was developed. Three medical experts provided prenatal health education to pregnant women, followed by an ultrasound screening to detect any early anomalies related to stunting. For other members of the community, experienced entrepreneurs give entrepreneurial education, which was supported by workshops for them to immediately practice the material that had been presented. It was intended that the community’s excitement would raise health awareness about stunting and the level of the local economy, allowing the stunting problem in this region to be ameliorated. It was found that the provision of health education programs had succeeded in increasing the level of community knowledge regarding stunting. Ultrasound examination found that all pregnant women in the area had normal pregnancies and fetal conditions. Community-based interventions through health education and increasing economic welfare based on tourism villages can be used to prevent stunting.
Co-Authors Abdi Alhaq Agustin Gunawan Akhmad Aminullah Ali Awaludin Anita Ekowati Bambang Suhendro Djoko Sulistyo Johanes B Muda Lina Choridah Luki Hariando Purba Mohammad Rizki Pratama Muslikh Muslikh Renga Rao Krishnamoorthy Sri Dwidanarti Suprapto Siswosukarto Suprapto Siswosukarto Suprapto Siswosukarto Torana Kurniawan Umi Khoiroh Wigati Dhamiyati Wiku Adhiwicaksana Krasna Wira Sucitra Ibrahim Yana Supriatna Yuliar Azmi Adhitama