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All Journal Jurnal Ilmiah Teknik Sipil TEKNIK MEDIA KOMUNIKASI TEKNIK SIPIL Rekayasa Sipil Journal of Geoscience, Engineering, Environment, and Technology Journal of Advanced Civil and Environmental Engineering Civil Engineering Dimension Aceh International Journal of Science and Technology
Ay Lie Han
Civil Engineering Department, Diponegoro University, Jl. Prof. Soedarto, SH, Tembalang, Semarang 50275
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Engineering Environmental Science Physics

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Analysis of Flat Plate Structures by Equivalent Grid Method Nurhuda, Ilham; Han, Ay Lie
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 13, Nomor 1, Edisi XXXI, PEBRUARI 2005
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.036 KB) | DOI: 10.14710/mkts.v13i1.3898

Abstract

Penggunaan model lebar efektif balok untuk menganalisis struktur flat-plate yang dikenai beban lateral sudah sering dilakukan. Namun demikian, sampai saat ini model tersebut masih terbatas penggunaannya pada model-model struktur 2 dimensi. Analisis ini memperluas penggunaan model grid ekuivalen untuk menganalisis struktur secara 3 dimensi. Lebar efektif grid dianalisis secara empirik berdasarkan hasil eksperimen. Perilaku struktur ditinjau dengan melakukan analisis struktur secara linier dan non linier.Keywords: flat-plate, model, reinforced concretePermalink: http://www.ejournal.undip.ac.id/index.php/mkts/article/view/3898[How to cite: Nurhuda, I. dan Ay Lie, H., 2005, Analysis of Flat Plate Structures by Equivalent Grid Method, Jurnal Media Komunikasi Teknik Sipil, Volume 13, Nomor 1, pp. 71-79]
Percobaan Tarik-Langsung pada Beton Konvensional Han, Ay Lie; Narayudha, Moga; Sabdono, Parang
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 3, Edisi XXX, OKTOBER 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.942 KB) | DOI: 10.14710/mkts.v12i3.3889

Abstract

Although the tensile strength of concrete does not plays a predominant role in the analysis and design of concrete structures, the knowledge of concrete behavior under tension is of value when estimating the load level under which cracking will occur. The relation between compression and tensile strength is developed based on experimental results and is represented as a formula highly depending on the tensile testing method in the laboratories.  The Splitting Tensile Test and Flexural Strength Method are well know, while the Direct Tensile Test is relatively young, and its acknowledgement by ASTM under process.  The experimental research conducted at the Concrete and Structural Laboratory, Diponegoro University, Semarang tries to give a better view to the Direct Tensile Test for concrete.  This paper presents in brief, the indirect and direct testing methods, and evaluates the data obtained.Kata kunci : Kuat tarik beton, direct Tensile test, indirect test, kuat tekan betonPermalink: http://www.ejournal.undip.ac.id/index.php/mkts/article/view/3889[How to cite: Aylie, H., Narayudha, M., dan Sabdono, P., 2004, Percobaan Tarik-Langsung pada Beton Konvensional, Jurnal Media Komunikasi Teknik Sipil, Volume 12, Nomor 3, pp. 75-83]
Concrete Recycling Han, Ay Lie
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 14, Nomor 2, Edisi XXXV, JUNI 2006
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (184.846 KB) | DOI: 10.14710/mkts.v14i2.3946

Abstract

Limbah benda uji beton yang tertimbun di Laboratorium Bahan dan Konstruksi, Fakultas Teknik Jurusan Sipil Undip setiap harinya mencapai kubikasi yang cukup tinggi.  Bahan ini merupakan komponen limbah industri yang dapat mempengaruhi tata guna lahan dan merupakan pencemar lingkungan.  Pada proses pembongkaran bangunan lama, volume limbah beton akan lebih besar lagi.  Berbagai usaha telah dilakukan untuk mendaur ulang atau memanfaatkan bahan limbah beton.  Salah satu alternatif yang dipandang baik secara struktur maupun dari segi ilmu lingkungan adalah mendaur ulang dan memakai kembali bahan agregat kasar yang berasal dari bahan beton.  Sifat fisis dan mekanis bahan agregat ini berbeda dengan bahan agregat asli yang berasal dari pemecahan batu.  Faktor-faktor yang sangat berpengaruh adalah kadar resapan yang tinggi, adanya sisa-sisa mortar yang menempel pada agregat dan variasi kualitas bahan dasar yang sulit ditentukan secara tepat.  Tulisan ini membahas perkembangan paling dini dalam bidang daur ulang agregat. Hasil-hasil penelitian yang dilaksanakan oleh Laboratorium Bahan dan Konstruksi, Fakultas Teknik Jurusan Sipil Undip akan di evaluasi secara singkat. Kata kunci: agregat daur ulang (RCA), kuat tekan, sifat-sifat agregat, ilmu lingkunganPermalink: http://www.ejournal.undip.ac.id/index.php/mkts/article/view/3946[How to cite: Han A.Y., 2006, Concrete Recycling, Jurnal Media Komunikasi Teknik Sipil, Volume 14, Nomor 2, pp. 198-205]
Waktu Ikat Adukan Beton dengan Pocket Penetrometer serta Korelasinya terhadap Nilai Slump Narayudha, Moga; Han, Ay Lie
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 13, Nomor 3, Edisi XXXIII, OKTOBER 2005
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (255.204 KB) | DOI: 10.14710/mkts.v13i3.3922

Abstract

Workability of concrete mixtures has direct impact to placing, compaction and density of hardened concrete.  To date the concrete industry has mandated the slump-value obtained by the Abrams-Harder method as the standard for evaluating concrete’s workability.  On the other hand, setting time of cement strongly influences the workability of mixtures.  A slump value of zero was identified as to be the initial setting time of mixture.  Research performed at the Material and Construction Laboratory, Diponegoro University, showed that actual setting time measured by mixture testing with the Pocket Penetrometer deviates significantly from the results of the Abrams test. Further, the effect of retarding admixtures to the workability of concrete mixtures, are evaluated.Keywords: Concrete mixture, Initial setting time, Pocket Penetrometer, Slump, AbramsPermalink: http://www.ejournal.undip.ac.id/index.php/mkts/article/view/3922[How to cite: Narayudha, M. dan Han, A.L., 2005, Waktu Ikat Adukan Beton dengan Pocket Penetrometer serta Korelasinya terhadap Nilai Slump, Jurnal Media Komunikasi Teknik Sipil, Volume 13, Nomor 3, pp. 67-74] 
Steel-Slag as Aggregate Substitute’s Influence to Concrete’s Shear Capacity an Experimental Approach Han, Ay Lie; Narayudha, Moga
MEDIA KOMUNIKASI TEKNIK SIPIL Tahun 16, Nomor 3, OKTOBER 2008
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (387.992 KB) | DOI: 10.14710/mkts.v16i3.3696

Abstract

Penggunaan slag baja sebagai pengganti agregat kasar pada beton telah menunjukkan nilai-nilai positif seperti meningkatnya kuat tekan beton, perbaikkan kelacakan (workability) adukan segar dan pengurangan pencemaran logam berat dengan adanya proses solidifikasi dalam semen. Karena masa jenis beton slag juga meningkat, maka perlu diadakan penelitian lanjut tentang kemungkinan penggunaan beton-slag ini sebagai komponen struktural. Peningkatan kuat tekan beton yang seiring dengan peningkatan massa jenisnya membuka peluang penggunaan bahan ini sebagai elemen struktur yang tertumpu pada tanah, seperti misalnya balok basement, balok tie-beam dan rigid pavement. Namun demikian perilaku beton-slag terhadap respons geser (shear) belum diketahui dengan pasti. Uji laboratorium ini meneliti perilaku geser balok beton-slag yang diberi tulangan tunggal sedemikian sehingga pola kehancuran balok dipengaruhi oleh kehancuran gesernya. Hasil pengujian dibandingkan terhadap balok identik dengan agregat Pudak Payung sebagai elemen kontrol. Pengamatan terhadap balok-balok ini menunjukkan bahwa penggunaan slag meningkatkan kapasitas geser beton sebesar 11%, serta tidak terjadi pergeseran pada pola kehancuran. Kata kunci: Slag, Agregat Kasar, Kuat Tekan, Kapasitas Geser. ABSTRACT The use of steel slag as a substitute to natural aggregates for concrete increases the compression strength and workability of fresh concrete mixes. Furthermore, by solidification in the cement matrix, the pollution of heavy metals into soil and groundwater can be reduced significantly. The utilization of slag-concrete to be used as structural components need to be conducted especially since mass density increases as a function of slag percentage. Possible aspects are among others, basement components, tie-beams and rigid pavement elements. All these structures rest directly on supporting under layers, reducing their negative high mass-density effect. While compression and tensile behavior have been explored, the shear capacity of slag-concrete has yet to be investigated. This experimental work covers the behavior of singly reinforced concrete beams failing under shear mode. The result is compared to the controlling element, identical to the concrete-slag beam. The controlling beam uses Pudak Payung aggregates. The experimental research shows that the slag-concrete’s shear capacity increases 11% to the Pudak Payung concrete. The mode of failure however, remains the same.Keywords: Slag, Coarse Aggregates, Compression and Shear StrengthPermalink: http://ejournal.undip.ac.id/index.php/mkts/article/view/3696[How to cite: Han A.Y. dan Narayudha, M. (2008), Steel-Slag as Aggregate Substitute’s Influence to Concrete’s Shear Capacity an Experimental Approach, Jurnal Media Komunikasi Teknik Sipil, Tahun 16, Nomor 3, pp. 223-230]
Kajian dan Evaluasi Struktur Slab Prestressed Precast Modular Concrete Eratodi, I Gusti Lanang Bagus; Awaludin, Ali; Han, Ay Lie; Triwiyono, Andreas
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 26, Nomor 1, JULI 2020
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5241.167 KB) | DOI: 10.14710/mkts.v26i1.27765

Abstract

Prestressed precast modular concrete slabs function rigid pavement, supporting vehicle loads above it on subgrade with relatively low bearing capacity. This slab measures 2000 x 850 x 150 mm3 of regular reinforced concrete (old production) or prestressed concrete (new production) quality K-500. After several times of use, damage occurs mainly at the end of the slab in the form of spalling. The objectives of the study and evaluation were: (1) observing damage; (2) material quality data; (3) numerical modeling by taking into account material properties, loading and soil conditions; and (4) providing slab design recommendations including materials and geometrics. The method of study and evaluation of slab damage was done by observing the damage, taking concrete core-case and testing it in the laboratory, and modeling the slab structure with various parameters (soil data, concrete quality and slab geometry). Field observations and analysis results show that concrete slab spalling occurs initially at the edge (850 mm wide) which in turn causes the effectiveness of the pre-tension force to be suboptimal and finally the concrete spalling volume increases. Apart from the frequency of collisions during installation and slab deformation when supporting vehicle loads. Concrete spalling problems also due to inappropriate concrete quality.
Pengaruh Substitusi Semen dengan Semen Slag pada Mortar terhadap Kebutuhan Air dan Waktu Ikat, dan Peningkatan Kuat Tekan Mortar pada Umur 14 hari dan 28 Hari Adi, Rudi Yuniarto; Rizqi, Safira Yulia; Subagyo, Sie Alexander Patrick; Han, Ay Lie
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 26, Nomor 2, DESEMBER 2020
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (392.702 KB) | DOI: 10.14710/mkts.v26i2.31691

Abstract

The use of industrial waste as a component of nowadays building material has become of major importance due to the underlining of environmental and sustainability issues. Among these materials is Ground Granulated Blast Furnace Slag (GGBFS), often referred to as slag-cement. The material is a residue produced during the steel refining process. The cementitious nature of the product makes it most suitable for ordinary Portland cement (PC) substitution. However, the behavior of this slag-cement in terms of development time and strength has not been defined in great details. In the construction industry, time is of major importance, a prolonged hydration process could delay the overall process. This research work focused on the setting time and strength response of slag-cement in mortar. The ratio of mortar constituent of cement-to-sand was 1 : 3. The percentage of slag-cement substitute to PC was 0%, 25%, 50% and 75% to the cement weight. The compressive strength was tested at the age of 14 days and 28 days. The results of the analysis showed that at a 25% slag-cement substitution a very significant increase in strength was shown. The increase was more pronounced at the age of 28 days when compared to 14 days and recorded to be 31.90%. As for the 50% and 75% slag-cement substitution, no significant increase in strength improvement was noticed. The test results showed a 2.66% enhancement for the 50% slag- cement substitution and a 2.45% increase for a 75% slag-cement replacement. The study also showed that slag-cement required a higher water-cement factor for the normal consistency
Pengembangan Alat Simulasi Model Numeris Elemen Beton Bertulang dengan Respon Geser dan Lentur Tinggi Nuroji, Nuroji; Asshidiqie, Muhammad Rony; Sukamta, Sukamta; Han, Ay Lie
TEKNIK Vol. 42, No. 2 (2021): August 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i2.32683

Abstract

Pengujian eksperimental elemen beton bertulang di laboratorium memiliki kelemahan bahwa penyiapan benda uji sampai selesainya proses pengujian memerlukan waktu lama. Biaya yang tinggi mengakibatkan jumlah benda uji terbatas, dan beratnya elemen skala penuh merupakan kendala pada saat set-up. Tingkat ketidak-telitian dipengaruhi banyak faktor seperti ketersediaan alat presisi, kondisi laboratorium dan faktor kehandalan laboran. Agar perilaku sebuah elemen beton bertulang dapat dianalisa dengan teliti dan cepat, diperlukan sebuah model numeris yang dapat digunakan sebagai alat simulasi untuk menganalisa pengaruh variabel-variabel bebas pada perilaku elemen beton bertulang. Agar model numeris diyakini kehandalan dan ketelitiannya, perlu dilakukan beberapa tingkatan validasi, baik dari validasi sensitivitas model itu sendiri, maupun validasi terhadap data benda uji aktual di laboratorium. Model elemen hingga yang dikembangkan dalam studi ini dikhususkan pada kondisi tegangan lentur dan geser tinggi, akibat respon beban vertikal dan horizontal yang umum terjadi pada stuktur sesungguhnya di lapangan. Proses validasi terhadap model dilakukan dengan analisa sensitivitas terhadap kehalusan mesh dan inkrementasi deformasi vertikal, sedang validasi terhadap benda uji eksperimental di tujukan pada aspek respon beban-deformasi dan pola perkembangan retak beton. Dari proses ini dibuktikan bahwa model yang dikembangkan memberikan hasil prediksi yang sangat teliti terhadap perilaku elemen sesungguhnya, sehingga dapat digunakan sebagai alat simulasi.
The Influence of External CFRP String Reinforcement on The Behavior of Flexural RC Elements Junaedi Utomo; Nauval Rabbani; Sri Tudjono; Ay Lie Han; Sukamta
Journal of Geoscience, Engineering, Environment, and Technology Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021)
Publisher : UIR PRESS

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

Abstract

External reinforcement is an excellent method for improving the load carrying capacity and ductility behaviour of reinforced concrete members in flexure. Enhancement becomes a necessity when current standards mandate a higher performance compared to older codes. External reinforcement is an environmentally friendly and sustainable solution, since demolition and re-building could be postponed, and the building can be used while work in conducted on the members. Carbon Fiber Reinforced Polymers (CFRP), having a low weight-to-volume ratio and an excellent resistance to corrosion, can be used as external reinforcement to effectively increase the flexural and shear strength of a member. To evaluate the effectiveness of CFRP strings, two types of reinforced concrete T-beams were tested. The specimens consist of a strengthened member in both shear and flexure using CFRP wraps and CFRP strings, and a conventional reinforced concrete beam. The specimens were subjected to a one-point-loading system to simulate high shear stresses in combination with a maximum bending moment at mid-point. The installation of CFRP strings was conducted using the Near Surface Mounted (NSM) method, while the sheets were Externally Bonded Reinforcement (EBR). The strings and sheets were impregnated and pultruded on side. The test results showed that the strings and wraps substantially increased the ultimate load carrying capacity and ductility of the member. The ultimate load enhancement was found to be 32% from 117kN to 154kN, and the vertical deformation improved 25% from 16 mm to 20 mm. The failure mode was characterized by initial debonding of the strings in the interface between the strings and the epoxy, followed by string-rupture. The two strings ruptured concurrently, due to stress re-distribution within the member.
Bond-shear Behavior of FRP Rods as a Function of Attachment Configuration Agung Budipriyanto; Ay Lie Han; Hsuan Teh Hu
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 1, No 1 (2018): April
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.1.1.9-17

Abstract

The use of external reinforcement to improve or enhances the flexural capacity of a member depends on the transfer capacity, and the failure behavior of the composite between the reinforcement, the epoxy resin and the concrete. The most influencing factor is the bond-shear capacity between the rod and the epoxy, and the epoxy to the concrete. Fiber Reinforced Polymer (FRP) rods are the latest alternate for fulfilling the external reinforcement scheme. In the field, the mandated embedment depth as outlined by the ACI 440 code, could customary not be achieved since factors such as the depth of the concrete cover, and presence of stirrups limits the space. This study is aimed to evaluate the effect of FRP rod configurations with respect to the concrete surface, to the effectiveness of external reinforcement. The study looked into the bond-shear capacity as well as the mode of failure, influence by the rod attachment depth. It was shown that the embedment depth significantly influenced the failure mode, and therefore the strain transfer capacity from the concrete to the rods.
Co-Authors Agung Budipriyanto Ali Awaludin Andreas Triwiyono Arnie Widyaningrum Asshidiqie, Muhammad Rony Banu Ardi Hidayat Banu Ardi Hidayat Buntara S. Gan Buntara Sthenly Gan Eva Wahyu Indriyati Ferianto Raharjo Harijanto Setiawan Hsuan Teh Hu Hsuan-Teh Hu Hsuan-Teh Hu Hsuan-Teh Hu I Gusti Lanang Bagus Eratodi Ilham Nurhuda Junaedi Utomo Junaedi Utomo Junaedi Utomo Lena Tri Lestari Moga Narayudha Muhammad Nur Khusyeni Nanang Gunawan Nauval Rabbani Nuroji Nuroji Parang Sabdono Prisca Evelyn Yulianita Rizqi, Safira Yulia Rudi Yuniarto Adi Sholihin As’ad Sie Alexander Patrick Subagyo Sri Tudjono Subagyo, Sie Alexander Patrick Sukamta Sukamta Supriyadi Supriyadi Vanessa Nurmalita Windu Partono Yanuar Haryanto