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Sholihin As’ad
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Civil Engineering, Building, Construction & Architecture Education

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Journal : Jurnal Teknik Sipil

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EVALUASI KERENTANAN BANGUNAN DENGA PENGUJIAN MIKROTREMOR DAN KINERJA DINAMIK BANGUNAN TERHADAP GEMPA DISERTAI METODE REHABILITASI BANGUNAN RUSUNAWA LUBUK BUAYA PADANG Hernanti, Hanna Yuni; Kristiawan, Steafanus Adi; As’ad, Sholihin
Jurnal Teknik Sipil Vol 1, No 1 (2013): Jurnal Teknik Sipil
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AbstrakLatar Belakang: Gempa bumi yang terjadi pada 30 September 2009 di Padang menimbulkan kerusakan struktural pada Rusunawa Lubuk-Buaya Padang. Untuk mengetahui performa bangunan maka dilakukan evaluasi kondisi eksisting bangunan. Tujuan penelitian ini adalah adalah untuk mengetahui kerentanan dan kinerja dinamik bangunan yang berkaitan dengan keamanan bangunan eksisting paska gempa dan alternatif rehabilitasi bila diperlukan.Metode: Jenis penelitian ini adalah metode kuantitatif, yaitu dengan analisis data sekunder pengujian lapangan mikrotremor pada 13-18 November 2009 pada empat titik lokasi pada bangunan dan dua titik di permukaan tanah sekitar bangunan yang disertai data teknis dan dokumentasi visual bangunan paska gempa. Hasil filter pengujian mikrotremor dianalisis dengan metode Horizontal-to-vertical spectral ratio (HVSR) sebagai parameter pengukuran kerentanan bangunan. Selanjutnya mengukur kinerja seismik bangunan dengan analisis respon spektrum sesuai SNI 1726:2012. Bangunan yang dinyatakan tidak aman perlu perkuatan (rehabilitasi) terpilih, yaitu dengan teknik perkuatan Tuned Mass Damper (TMD) dan viscous dampers.Hasil: Dari hasil analisis HVSR didapatkan resiko resonansi terjadi pada Tanah-2 dengan frekuensi natural  19,34 rad/detik ? frekuensi natural bangunan  19,53-25.12 rad/detik. Dan hasil indeks kerentanan bangunan (Nakamura) tertinggi pada lantai 3 di 68, 80 mikron (EW). Menurut Keputusan Menteri Negara Lingkungan Hidup No.49 Tahun 1996, frekuensi bangunan dinyatakan tidak aman untuk menerima beban kejut dengan kecepatan di atas 5 mm/detik.Respon seismik bangunan menghasilkan drift maksimum 522,8 mm jauh dari drift ijin  49,23 mm. Sehingga struktur berpotensi tidak stabil dan harus didesain ulang. Perkuatan dengan menggunakan. TMD (MTMD-V-1200 dan MTMD-H-1900) mampu mereduksi drift hingga 50%, namun belum mampu memenuhi drift ijin. Viscous dampers (MHD-250) mampu mereduksi drift hingga 93% dan bangunan stabil. Kata Kunci:  mikrotremor, HVSR, SNI 1726:2012, TMD, Viscous dampers.
TOLAK UKUR KINERJA TANGGUL BERDASARKAN PENILAIAN KEANDALAN, PENILAIAN PERMUKAAN TANGGUL DAN STABILITAS TANGGUL (Studi Kasus: Ruas Jurug Mojo, Surakata) Hermawan, Chitra; Suprapto, Mamok; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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ABSTRACT Flood is known as a disaster that usually comes suddenly, and therefore, people are not prepared. As a result, it causes a dead loss, both human and material. In order to anticipate flood, some dikes have been built.Bengawan Solo dike has changed through time. Damages along the dike have been identified and followed-up by conducting some improvements to make it function well. However, since the repairs are carried out based on the occurrence of landslide or burst, there are many portions of the dike that are damaged but receive no rehabilitation. In fact, in some portions of the dike crossing densely populated settlements, there are many buildings cutting through the outside part of the dike base. Furthermore, portions of the dike in that area have been transformed to street with uncontrolled load. For example, it is found that some vehicles loading construction materials passing on the dike. But, in fact, this sort of loading has not been predicted in the planning. Hence, it is important to foreknow the benchmark of dike performance to assess the performance of dike before landslide or burst occurring.This research was conducted to the Jurug-Mojo portion of Bengawan Solo dike. It is 1.317 m long and is divided into 13 portions, each of which is 100 m long. The parameters applied in this research were cross-section, dike elevation and data about land, while the variables were debit, gravity acceleration, water surface elevation, soil pore index, shearing force, specific weight, and friction angle. There were 3 (three) methods proposed to assess the benchmark of the dike performance, including reliability assessment, dike surface assessment (PCI Mmethod) and dike stability assessment (Bishop Mmethod).The findings of the research are as follows. The maximum debit that can be embanked by the dike is 1,489 m3/s; the reliability index is 0.675; the PCI index is 59.4 (good); the dike stability index before overtopping is 2.771 (stable); the dike stability index when overtopping is 1.075 (unstable), the water stability index when lowering 1 m is 1.775 (stable). Keywords: dike, reliability index, stability, PCI (Pavement Condition Index) 
NFLUENCE OF USING NON-STANDARD SPECIMEN ON COMPRESSIVE STRENGTH OF NORMAL AND HIGH STRENGTH CONCRETE Esbata, Abdulati Mohamed; Kristiawan, Stefanus Adi; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract Compressive strength of concrete is one of the most important  test  for  construction properties for quality control of concrete and design new constructions, there are different molds that are used for casting concrete specimen during the concrete works according to various standards at different countries. On the other hand, it is known that different shapes and sizes of concrete specimen can cause differences in the results of compressive strength. In this study the influence of specimen sizes and shapes on compressive strength of normal and high strength concrete are investigated using experimental study. The experimental study was conducted for six different specimen types cube 150 mm, cube 100 mm, cube 75 mm, cylinder Ø150x300 mm, Ø100x200 mm, Ø75x150 mm. At six different concrete strength level was 20,30,40,50,60 and 70 MPa according to standard cube specimen and tested at 28 Days of age. For The experimental study, hardened density, non-destructive tests (Rebound hammer and UPV), compressive strength and splitting tensile strength for different concrete strength level were performed and some analyses were done to obtain conversion factors and some relations between these tests. The results of analyses indicate that for all testing, there is a bigger influence of variation of size and shape of the specimens, by changing the compressive strength level. The compressive strength increases as the specimen size decreases.. Also The compressive strength of  cube 150 mm is generally higher than strength cylinder Ø150x300 mm and The conversion factors of compressive strength between is varied from 0.76 to 0.88 for the designed cube compressive strength of  20 to 70 MPa. The conversion factors of compressive strength between standard and non-standard specimen at different concrete strength at 28 days to equivalent 150 mm standard cube specimen had been determined and presented in table 4.7.  The correlation between (split tensile test / Schmidt hammer test/ UPV test) of standard specimen 150 x 150 mm cube to compressive strength of non-standard specimen had been determined. Keywords: compressive strength level, influence of specimen sizes and shapes, conversion factors, splitting tensile strength, Schmidt hammer test, UPV.
COMPRESSIVE STRENGTH AND MODULUS OF ELASTICITY OF STEEL FIBER REINFORCED CONCRETE (SFRC) UNDER DIFFERENT TEMPERATURE CONDITIONS Akesh, Sami Saleem; Sambowo, Kusno Adi; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 1 (2014): Jurnal Teknik Sipil
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AbstractSFRC consists of concrete matrix with steel fibers that serve as reinforcement, which is useful to reduce the brittle nature of concrete. The use of steel fibers in this study aimed to determine the effect of steel fibers in the concrete compressive strength and modulus of elasticity. Temperature can affect properties of concrete, then in addition to determine the effect of steel fiber will do heat treatment at a certain temperature.This research was experimental methods and used cylindrical specimen with a diameter of 15 cm and a high of 30 cm. Specimens were 75 samples. Samples were SFRC containing fibers of 0%, 0.75% and 1:25%. Some samples were exposed in various temperature, ambient temperature, 200?C, 400?C, 600?C and 800?C. Compressive strength and modulus of elasticity were tested at 28 days and soon after elevated temperature exposed on samples.The test result that the compressive strength of concrete with steel fiber addition decreased compared to plain concrete. The modulus elasticity of samples increases with the amount of steel fibers in the concrete mix. The SFRC 0%, 0.75% and 1:25% compressive strength values are 39.066 MPa, 28.875 MPa and 31.705 MPa respectively while the modulus of elasticity 6322.353 MPa, 7697.876 MPa and 8873.661 Mpa respectively. After the temperature treatment of the specimen, the results of which are shown in the increasing temperature of the concrete, the compressive strength and modulus of elasticity decreased significantly. The highest compressive strength at temperatures of 800?C, shown in plain copkncrete with a value of 16,419 MPa, whereas elastic modulus obtained in 1:25% SFRC with a value of 2015,357 Mpa.Keywords: SFRC, Steel fiber, temperature, compressive strength. Modulus elasticity
THE STRENGTH AND STIFFNESS MODULUS OF THIN LAYER HOT MIX ASPHALT CONCRETE AT VARIOUS TEMPERATURE Elshawesh, Abdulhakim Mustafa; Setyawan, Ary; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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AbstractStiffness modulus of asphalt concrete mixture is one of the most important parameters for the flexible pavement design that is very susceptible from temperature and time loading. The stiffness modulus here may be defined as a measure of the load spreading ability of material. The stiffness of asphalt mixture can be measured through various laboratory researches and empirical methods. Various laboratory researches have been employed to measure this property of asphalt such as indirect tensile modulus test, ITSM.The aims of this research were to achieve the viability of using asphalt 60/70 pen with different temperature on strength and stiffness modulus on thin layer HMA (4 cm) compared to Asphalt Concrete Wearing Course (6.8 cm). The other purpose is to get to know the effect of the using thin layer HMA (4 cm) in different climate region. All of the asphalt concrete mixtures of thin layer HMA and AC-WC which were used in this research based on Marshall Mix design according to Indonesian standard (Bina Marga 2010). The laboratories tests which have been conducted in this research were: indirect tensile strength (ITS), unconfined compressive strength (UCS) and indirect tensile stiffness modulus (ITSM) at temperature 10°C, 20°C, 40°C and 60°C.In comparison with the results of indirect tensile strength test, indirect tensile stiffness modulus test and unconfined compressive strength test, it is noticed that the strength and stiffness modulus of thin layer hot mix asphalt was affected by the temperature which the temperature degree might increase to decrease or the way around. From the results of ITSM test for HMA and AC-WC showed that starting from the temperature 20°C to 60°C there is no significant value of stiffness behavior at them. However, there is slight different value at temperature 10°C mixture respectively. Keywords: Thin layer, AC-WC , Asphalt 60/70 pen, ITS test, UCS test & ITSM test @ (10 ºC , 20 ºC , 40 ºC , 60 ºC).
Co-Authors Abdulati Mohamed Esbata Abdulhakim Mustafa Elshawesh Ade Kurnia Ary Setyawan Chitra Hermawan Fouad M. Ali Bin Ghasheir Fouad M. Ali Bin Ghasheir, Fouad Hana Wardani Puruhita Hanna Wardani Puruhita, Hanna Wardani Hanna Yuni Hernanti Khalid Soliman Ahmad Kusno Adi Sambowo Mamok Suprapto Muslich, Yusep Niken Silmi Surjandari Pujiyanto Pujiyanto Ramadhan Al Mahdi Jibril Sami Saleem Akesh, Sami Saleem Steafanus Adi Kristiawan, Steafanus Adi Stefanus Adi Kristiawan Yusep Purwana Muslih