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All Journal Journal of Engineering and Technological Sciences Jurnal Teknik Sipil
Ivindra Pane
Teknik Sipil, Fakultas Teknik Sipil dan Lingkungan - Institut Teknologi Bandung, Jl. Ganesa No.10 Bandung
Civil Engineering, Building, Construction & Architecture Engineering

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Confinement of Reinforced-Concrete Columns with NonCode Compliant Confining Reinforcement plus Supplemental Pen-Binder Kristianto, Anang; Imran, Iswandi; Suarjana, Made; Pane, Ivindra
Journal of Engineering and Technological Sciences Vol 44, No 3 (2012)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (776.434 KB) | DOI: 10.5614/itbj.eng.sci.2012.44.3.2

Abstract

Abstract.  One  of  the  important  requirements  for  earthquake  resistant  building related  to  confinement  is  the  use  of  seismic  hooks  in  the  hoop  or  confining reinforcement  of  reinforced-concrete  column  elements. However, installation of a  confining  reinforcement  with  a  135-degree  hook  is  not  easy.  Therefore,  in practice, many construction workers apply a confining reinforcement with a  90-degree  hook  (non-code  compliant).  Based  on  research  and  records  of  recent earthquakes  in  Indonesia,  the  use  of  a  non-code  compliant  confining reinforcement  for  concrete  columns  produces  structures  with  poor  seismic performance.  This paper  presents a study  that  introduces  an additional element that is expected to improve the effectiveness of concrete columns confined with a non-code compliant  confining reinforcement. The additional element, named a pen-binder,  is   used to keep the  non-code compliant  confining reinforcement in place. The effectiveness of this element  under pure axial concentric loading  was investigatedcomprehensively.The  specimens  tested  in  this  study  were  18 concrete columns,with a cross-section of 170 mm x 170 mm and a height of 480 mm. The main test variables were the material type of the  pen-binder, the angle of  the  hook,  and  the  confining  reinforcement  configuration.The  test  results indicate  that  adding  pen -binders  can  effectively  improve  the  strength  and ductility of the column specimens confined with a non-code compliant  confining reinforcement. 
On the Development of a Nomogram for Alkali Activated Fly Ash Material (AAFAM) Mixtures Simatupang, Partogi H.; Imran, Iswandi; Pane, Ivindra; Sunendar, Bambang
Journal of Engineering and Technological Sciences Vol 47, No 3 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (821.159 KB) | DOI: 10.5614/j.eng.technol.sci.2015.47.3.1

Abstract

Alkali activated fly ash material (AAFAM) has become the most promising material to substitute materials based on ordinary Portland cement (OPC). However, there is no available nomogram for AAFAM mixtures. In contrast, there are many rational methods available in the literature to make paste, mortar and concrete with OPC based materials, such as Monteiro-Helene’s nomogram, which uses Abram’s law, Lyse’s law and Molinari’s law. This paper presents a study to construct such a nomogram for AAFAM mixtures by first conducting experiments on the  paste and mortar phases. The procedure of Monteiro-Helene’s nomogram was adopted in this formulation. The first step in this direction was to find a close relationship between the strength and paste composition of the material that can be used as a substitute for Abram’s law. The second step  was  to construct the equivalent  of  Lyse’s and Molinari’s relationships by varying the sand and fly ash contents. The results show that it is possible to make a nomogram for AAFAM mixtures such as the one for OPC based materials. Class F fly ash and its mortar phase were used to construct the nomogram. In addition, the  mortar  samples  that were  used to build the nomogram had similar solidification products according to their microscopic characteristics.
Kekuatan Riset Multiskala dalam Membentuk Teknologi Infrastruktur Masa Depan Pane, Ivindra
Jurnal Teknik Sipil Vol 15, No 1 (2008)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (800.202 KB)

Abstract

Abstrak. Riset multiskala adalah bidang riset yang mengeksploitasi beragam fenomena fisika dan kimia yang terjadi pada berbagai skala observasi. Yang menjadi perhatian utama dalam riset ini adalah skala observasi berpengaruh terhadap tingkat pemahaman mengenai suatu fenomena fisika atau kimia. Pemahaman yang mendalam biasanya didapat setelah observasi pada skala yang lebih kecil (mikron- maupun nano-meter) yang dapat dilakukan pada suatu bahan/sistem buatan manusia maupun bahan/sistem di alam. Riset multiskala dikenal menghasilkan terobosan-terobosan dalam bidang iptek. Contoh yang sangat nyata adalah pelapis anti basah yang dihasilkan dari rekayasa struktur permukaan sehingga butiran cairan membentuk sudut kontak < 900 (non wetting), jenis pelapis yang tahan terhadap suhu sangat tinggi yang disebut pelapis pelindung panas (thermal barrier coating), dan semen pemakan polutan yang mengandung titanium dioksida yang dapat mempermudah proses dekomposisi polutan di udara. Contoh-contoh ini setidaknya ini dapat mengilhami kita akan potensi dari riset multiskala pada aplikasi teknologi infrastruktur. Tulisan ini mengetengahkan hasil riset multiskala terutama yang erat hubungannya dengan perkembangan teknologi infrastruktur. Diharapkan apa yang disajikan dapat dikembangkan lebih lanjut di lingkungan ITB.Abstract. Multiscale research is a subject that exploits various physical and chemical phenomena at different observation scales. In this research, the emphasis is that the observation scale influences our level of understanding regarding a physical or chemical phenomenon. A deeper understanding is usually acquired by making observations at smaller scales (micon- or nano-meter) that can be done towards man-made or natural materials/systems. Multiscale research is known to produce breakthrough inventions in science and technology. Some real examples include the non wetting coating that is developed by engineering a surface that allows for the liquid contact angle to be less than 900 (non wetting), the thermal barrier coating which can withstand exposures tovery high temperature environment, and the pollutant consuming cement containing titanium oxide which allows for decomposition of pollutants in air. These examples can inspire the development of multiscale research for infrastructure technology. This paper highlights the results of multiscale research, especially those that is relevant to the development of infrastructure technology. It is desired that what is presented can be developed further at ITB.
Studi Eksperimental Perilaku Siklis Flat Sab Beton Mutu Sangat Tinggi Kurniawan, Ruddy; Budiono, Bambang; Surono, Awal; Pane, Ivindra
Jurnal Teknik Sipil Vol 21, No 2 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1024.573 KB)

Abstract

Abstrak. Makalah ini menampilkan hasil penelitian eksperimental terhadap 3 buah benda uji struktur flat slab beton mutu sangat tinggi dengan campuran beton bubuk reaktif dibawah kombinasi beban gravitasi dan beban lateral siklis. Pengujian dilakukan dengan sistem sub assemblage hubungan pelat dan kolom dari struktur flat slab. Benda uji terdiri dari pelat dengan rasio tulangan tarik relatif rendah (0,65%) dan relatif tinggi (1,8%) yang diaplikasikan untuk bentang pelat 3,00 m sedangkan untuk pelat dengan bentang 2,00 m rasio tulangan yang dipakai hanya 1,8%. Beban gravitasi sebesar 8,45 kN/m2 diaplikasikan konstan, sedangkan beban lateral siklis diberikan dalam bentuk displacement control. Pembebanan siklis dilakukan melebihi ketentuan drift ACI 374.1-05 yaitu sampai dengan drift ± 5,00%. Pada drift 5%, perilaku non linear struktur menunjukkan respon histeresis yang daktail tanpa mengalami penurunan kekuatan yang signifikan baik untuk rasio tulangan tinggi maupun rendah. Meskipun demikian, penurunan kekakuan masih terjadi. Pengaruh rasio tulangan tarik lebih signifikan dibanding bentang pelat terhadap respon kekuatan dan kekakuan pelat terutama pada fase inelastis. Pelat bentang 3,0 m dengan rasio tulangan tarik rendah mempunyai rasio daktilitas perpindahan paling tinggi sedangkan pelat dengan bentang 3,0 m dengan rasio tulangan tarik tinggi mempunyai rasio daktilitas perpindahan paling rendah dibanding yang lain. Abstract. This paper presents the result of the experimental study on three very high strength concrete flat slab structures constructed with reactive powder concrete under combined gravity and cyclic lateral loads. The tests were conducted on slab-column connection sub assemblages of the flat slab structure. Two specimens had slab span of 3.00 m with relatively low and high tension steel reinforcement ratios of 0.65% and 1.8%, respectively. The other specimen had slab span of 2.00 m with tension steel reinforcoment ratio of 1.8%. The specimens were subjected to constant gravity load of 8.45 kN/m2 and the lateral cyclic load using displacement control close to 5% drift ratio. The drift was set up larger than as required in ACI 374.1-05. At 5% drift, nonlinear behavior of the structures showed ductile hysteresis responses without a significant decrease in strength both for lower and higher tension steel reinforcement ratio. However, a stiffness degradation still occurred for all specimens. Effect of tension steel reinforcement ratio was more significant than that of slab span on stiffness and strength responses particularly at inelastic ranges. Slab with span of 3.00 m and low tension steel reinforcement ratio showed the largest displacement ductility ratio while the slab with same span but higher tension steel reinforcement ratio resulted the lowest displacement ductility ratio compared to the other specimens.
Co-Authors Awal Surono, Awal Bambang Budiono Bambang Sunendar Iswandi Imran Made Suarjana Partogi H. Simatupang, Partogi H. Ruddy Kurniawan