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Bambang Supriyadi
Dosen Magister Teknik Arsitektur, Fakultas Teknik, Universitas Diponegoro
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Journal : Semesta Teknika

 1 
Perilaku Geser pada Keadaan Layan dan Batas Balok Beton Bertulang Berlubang Memanjang Krasna, Wiku A; Sulistyo, Djoko; Supriyadi, Bambang
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
Publisher : Jurnal Semesta Teknika

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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 Khoiroh, Umi; Siswosukarto, Suprapto; Supriyadi, Bambang
Jurnal Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
Publisher : Jurnal Semesta Teknika

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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.
Co-Authors Ahmad Muhajir, Ahmad Ali Awaludin Amalia Alifiani, Amalia Amalia, Alifiani, Amalia, Aminullah, Akhmad Andi Asrul Sani, Andi Asrul Andreas Triwiyono Anggono Ariebowo, Anggono Arief Fadhilah Astalis Ulul Absor, Didib Atiek Suprapti Atin Supriatin, Atin bambang adji Bambang Adji Murtomo Bambang Irawanto Bayu Sasongko Carera, Adela Darmajaya, Theo Alfaro Dida Diaz Priantara dimas Rachmaputra Djoko Sulistyo Eddy Prianto Edward Endriarto Pandelaki, Edward Endriarto Ergiyanti, Kharisma Erni Setyowati Faisal Nufus, Faisal Fajriyan Saiful, Fajriyan Fathurrahman Fathurrahman Fauzannur, Fauzannur Fitri Rachmawati Gagoek Hardiman H, I Gede Agung Shri Parta Hendro Trilistyo Hermin Werdiningsih Hermini Susiatiningsih indah dwi Jantu, Mochamad Athar Jefri Putri Nugraha Kustiandika, Salsabila Mahargyo, Dhady Pelita Making, Maria Yasinta Menge Muda, Johanes B Muslikh Muslikh Nadia Farabi, Nadia Nugraha, Jefry Putri Prasetyo, Aulia Azis Prayoto Prayoto Prayoto Priono, Bowo Purba, Luki Hariando Purbonuswanto, Welius R Siti Rukayah Rahardjo, R. Sugeng Rahardjo, Sugeng riska arrasy Safinta Rhosa Fajari, Safinta Rhosa Sasongko, Dimas Bayu Simanjuntak, Salomo Sri Wartini sukawi sukawi Suprapto Siswosukarto Surahmat, Djoko Suseno, Dewi Alima Nostalia Timur, Dya Ayu Cahya Titien Woro Murtini Umi Khoiroh, Umi Waluyo, Buyung Purnomo Widyastuti, Rida Wijayanti Wijayanti Wiku Adhiwicaksana Krasna Yushardi Yushardi, Yushardi