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PENGARUH PENAMBAHAN SERAT BAJA PADA SELF COMPACTING CONCRETE MUTU TINGGI Luvena, Gabriella Agnes; Siswanto, M.Fauzie; Saputra, Ashar
Jurnal Teknik Sipil Vol 14, No 2 (2017)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Permasalahan pada struktur terowongan dan jembatan bentang panjang adalah kesulitan pengecoran dan sifat getas beton yang menyebabkan retak-retak. Maka, diperlukan penelitian tentang penambahan serat pada beton untuk mendapatkan beton dengan durabilitas dan workablity lebih baik. Penelitian ini bertujuan mengetahui pengaruh penambahan serat baja pada sifat fisik dan mekanik self-compacting concrete mutu tinggi dengan target fcâ€™=70 MPa. Serat baja yang digunakan bermerek Dramix 3D dengan diameter 0,75 mm, rasio panjang-diameter (l/d) 80 dan variasi volume fraksi 0%, 0,5%, 0,75%, dan 1%. Sifat fisik beton segar yang diuji adalah slump flow, V-funnel, dan L-box. Sifat mekanik yang diuji adalah kuat tekan beton dan ketahanan kejut beton pada saat umur 7, 14 dan 28 hari. Pengujian kuat tekan mengacu kepada standar SNI 03-1974-1990. Pengujian ketahanan kejut beton menggunakan standar ACI committee 544. Hasil penelitian ini menunjukkan peningkatan kadar serat baja akan menurunkan workability beton segar SCC mutu tinggi. Sifat fisik beton segar dengan serat 0,5% dan 0,75% memenuhi syarat dalam The European Guidelines For Self Compacting Concrete (TEGFSCC-2005) tetapi SCC dengan serat 1% tidak memenuhi syarat. Hasil rerata pengujian kuat tekan dan ketahanan kejut pada SCC dengan kadar seratÂ 0%,0,5%, 0,75%, dan 1% umur 28 hari adalah 85,44 MPa, 79,94 MPa, 90,38 MPa, 91,729 MPa dan 9, 23,67, 25, serta 27 pukulan hingga beton runtuh total. Berdasarkan hasil penelitian ini, direkomendasikan penggunaan serat 0,75% dari volume beton karena dapat meningkatkan sifat mekanik beton dan memenuhi untuk semua persyaratan self-compacting concrete.

TINJAUAN HUBUNGAN KUAT TEKAN DAN LENTUR BETON DENGAN BAHAN TAMBAH SERAT BAJA UNTUK PERKERASAN PAKU Hermansyah, Hermansyah; Siswanto, Muhammad Fauzie; Saputra, Ashar
Jurnal TAMBORA Vol 3 No 1 (2019): EDISI 6
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (236.471 KB)

The Director General of Highways issued the 2010 revision 3 specification concerning minimum flexural strength for rigid pavement of 45 kg/cm2 or approximately 4.5 MPa, but the reality of obtaining such flexural strength should be using  high enough concrete quality and it will incur considerably high cost also. In this study was using a normal concrete method with the purpose of research to know  the relationship of compressive strength and flexural of concrete with the addition of variation of fiber 0%, 0,5%, 0,65% and 0,8% from weight of the concrete mixture. The results from this research showed that the compressive strength and flexure had increased successively in the fiber variation 0%, 0.5% and 0.65% amount 31.23 MPa, 33.06 MPa, 35.23 MPa and 4.58 MPa, 4.75 MPa, 5.04 MPa. It is because the fiber contained in the concrete has a fairly even distribution of fiber and does not have clumping. When variations of fiber above 0.65% such as 0.8% variation in the direction of fiber are difficult to control and at the time of mixing occurs clumping, So the value of compressive strength and flexural of concrete are decreases. The relation of compressive strength and flexural of concrete using a variation of steel fiber to obtain equation fs = 0,1226.fc '+ 0,7173 with value R2 = 0,9915 and α 0,82. The results obtained from the test is a rather good when compared with ACI and SNI T- 15-1991-03 method.

Studi Karakteristik Fondasi Pelat Tipis Dengan Pengaku Tiang “+” Pada Tanah Granuler Melalui Uji Eksperimen Dan Analisis Pemodelan Menggunakan Software Abaqus Syarif, Firman; Adi, Agus Darmawan; Saputra, Ashar
JURNAL SAINTIS Vol 17 No 2 (2017)
Publisher : UIR Press

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

[EN] The amount of damage that happened in Indonesian road is the impact of high traffic load exceeds the carrying capacity of the pavement. To reduce the problems that occur on the pavement the good systems of pavement are built, various studies conducted to produce a creative innovation in order to evaluate and improve the performance of the pavement system. this study has developed a new system of foundation with pile "+" to make the connection between plate and minipile (joint) becomes better. In this study, three models of foundation will be tested by loading test (following ASTM D 114 381 and ASTM D 3689 Pile Under static axial compressive load) to observe and analyze the behavior of the foundation model by loading centric and eccentric. In addition to laboratory tests this research also modeling analysis with Abaqus software to observe and analyze the behavior of the foundation model in terms of deformation and settlement. The results showed the distances between pile and pile provides a significant contribution in reducing the settlement in the foundation when given a maximum load of 20 kN, where is the foundation 1 had short distance between the other foundation the deformation and settlement is the smallest. The length of pile also give significant contribution to reduce the settlement like in foundation 3 that have 20 cm length of the pile have settlement and deformatioan smaller than the foundation 2 that have 10 cm length of the pile

Analisis Pengaruh Sloof terhadap Penurunan Fondasi Telapak dengan Simulasi Numeris Adityawan, Muh. Handy Dwi; Adi, Agus Darmawan; Saputra, Ashar
Semesta Teknika Vol 22, No 2 (2019): NOVEMBER 2019
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.222245

Sloof yang menghubungkan dua kolom selama ini diperhitungkan sebagai balok ikat (tie beam) agar kolom tidak bergeser. Sloof diasumsikan menggantung atau tidak bertumpu di atas tanah. Sehingga sloof murni sebagai pengikat antar dua kolom. Namun, kenyataan di lapangan sloof bertumpu di atas tanah atau di atas pasangan batu. Oleh karena itu sloof akan menerima beban vertikal dari bangunan. Desain sloof perlu diubah karena kondisi ini. Analisis dilakukan dengan menggunakan program SAP2000. Tanah dan pasangan batu dimodelkan sebagai spring dengan input parameter modulus reaksi tanah dasar (ks). Hasil analisis menunjukkan bahwa penurunan fondasi telapak pada kondisi sloof bertumpu di atas tanah atau di atas pasangan batu lebih kecil dibandingkan kondisi sloof menggantung. Selisih penurunan rata-rata sekitar 26%. Beda penurunan dan angular distortion antara dua kolom menjadi lebih kecil ketika sloof bertumpu di atas tanah atau di atas pasangan batu dibandingkan kondisi sloof menggantung. Momen lapangan yang bekerja pada sloof menggantung adalah positif sedangkan momen tumpuan adalah negatif. Sebaliknya, momen lapangan yang bekerja pada sloof bertumpu di atas tanah maupun di atas pasangan batu adalah negatif, sedangkan momen tumpuan adalah positif.Sloof connecting two columns has been calculated as a tie beam to keep them from moving apart. It was assumed as the hanging sloof or not rested on the ground. Hence it was purely as a tie between two columns. However, in the field, sloof is rested on the ground or the stone foundation. Therefore the sloof will receive the vertical load of the building. The sloof design need to be changed due to this condition. An analysis was conducted using SAP2000. The ground and the stone foundation were modeled as springs at which the modulus subgrade reaction (ks) was the input parameters. The results showed that the settlement of footing when the sloof resting on the ground or the stone foundation was smaller than the hanging sloof. The difference of the settlement was about 26% on average. Differential settlement and angular distortion between two column footings became smaller when the sloof was rested on the ground or the stone foundation compared to the hanging sloof. The field bending moment that occurred on the hanging sloof was positive, while the restraint moment was negative. In contrary, the field bending moment that occurred on the sloof rested on the ground or the stone foundation was negative, while the restraint moment was positive.Â

Preparedness of special needs school communities for earthquakes: A case study in an area with a very high seismicity in Daerah Istimewa Yogyakarta Satmoko, Tranggono Aji; Satyarno, Iman; Saputra, Ashar
ASEAN Natural Disaster Mitigation and Education Journal Vol. 2 No. 1: (July) 2024
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/andmej.v2i1.2024.1016

Background: DIY is a province in Indonesia that is very susceptible to earthquakes. In 2006, a seismic event measuring 6.2 on the moment magnitude scale struck DIY, causing injuries and extensive damage to both the structural and non-structural elements of several buildings, including one in the education sector. The problem of structural damage to educational facilities is a significant worry, especially in school communities that cater to vulnerable children, such as those in special needs schools/Sekolah Luar Biasa (SLB), who are more susceptible to harm during disasters. This study aims to assess the level of preparedness and accessibility of the special needs school community located in a very high seismic region of earthquakes in the DIY, in the event of an earthquake. Methods: The structural assessment took the form of a binary question, requiring a simple yes or no response. Findings: To reduce the risk of earthquakes in the special needs education sector, a review of the preparedness of the special needs school building and community was carried out by implementing “Satuan Pendidikan Aman Bencana (SPAB)” or Disaster Safe Education Unit guidelines. The findings suggest that SLB Sekar Melati Muh. Imogiri (78.26) was classed as having moderate earthquake risk, whereas SLB Dharma Bhakti Piyungan (88.55), SLB Insan Mandiri Dlingo (90.29), and SLB Purworaharjo (88.41) featured infrastructure that was rated as very vulnerable. With respect to SLB Dharma Bhakti Piyungan (64.52), SLB Insan Mandiri Dlingo (60.11), and SLB Purworaharjo (76.94), their average community readiness index scores put them in the intermediate capability category for earthquake preparedness. SLB Sekar Melati Muhmmadiyah Imogiri, however, was categorized as having a low capacity for earthquake readiness with an average index score of 56.92 for community preparedness. Conclusion: special needs school communities should raise their level of preparedness by undertaking seismic socialization and regular simulations to boost the community's understanding of earthquakes and reduce the likelihood of harm following an earthquake. Novelty/Originality of this Study: The study breaks new ground by assessing earthquake preparedness and accessibility in special needs schools within a high-seismicity region, addressing a critical gap in disaster risk reduction for vulnerable populations.

Experimental Study on the Performance of Mechanical Coupler Splice Made of Rebar Under Monotonic Loading Muhammad, Heidi; Saputra, Ashar; Triwiyono, Andreas
Semesta Teknika Vol 26, No 2 (2023): NOVEMBER
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v26i2.19263

The lap splice method presents a drawback due to reinforcement congestion, affecting the pouring and evenness of the concrete. Additionally, lap splicing significantly contributes to construction waste. As a result, research was conducted on mechanical connections using reinforcements to reduce construction waste and demonstrate the feasibility of these splices. In this study, the threaded coupler with standard national coarse threads splice method was employed, and tests were conducted following ASTM A1034-10a standards with monotonic tensile loading. Test specimens were created using 13 and 16 mm reinforcement sizes, varying the length and diameter of the coupler, and including welding at the coupler ends. The test results demonstrated that reinforced bars with splices exhibit a stress-strain relationship similar to intact reinforcement. However, these reinforced bars with splices did not meet the requirements outlined in SNI 2052:2017 concerning maximum stress and strain, including their comparison. Therefore, the utilization of these splices is not suitable for critical load-bearing areas.

Kajian Implikasi Undang-undang Cipta Kerja Terhadap Peraturan Daerah Tentang Bangunan Gedung di Kabupaten Wonogiri Nurokhman, Nurokhman; Wibowo, Richo Andi; Saputra, Ashar; Hariyanto, Gatot
Nuansa Akademik: Jurnal Pembangunan Masyarakat Vol. 9 No. 1 (2024)
Publisher : Lembaga Dakwah dan Pembangunan Masyarakat Universitas Cokroaminoto Yogyakarta (LDPM UCY)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47200/jnajpm.v9i4.2092

This research aims to identify the readiness of the Wonogiri Regency in 2021 regarding regional policies in building planning that support the Job Creation Law (No. 11/2020). Several analytical approaches are used with data taken directly through interviews and focus group discussions and other supporting data. As a result, Wonogiri Regency has two options, namely first, the Wonogiri Regency Building Regulations are revoked in their entirety on the grounds that the "spirit" has been amended by Law Number 11/2020 and PP Number 16/2021 concerning Building Implementation Regulations whose regulatory concept has changed from IMB to PBG . The second option is partial revision. In its implementation, it is necessary to increase the effectiveness of law enforcement, SIMBG tools and increase the capacity and competence of human resources as well as ensuring the Regional Regulations on RTRW and RDTR, and the Regional Regulation on Retributions.

Frictional Axial Resistance of Clamped Split Pocket Mechanism Steel Structural Joint: An Experimental Study Putra, Whelly T.; Setiawan, Angga F.; Saputra, Ashar; Satyarno, Iman; Pratama, Hamdi Y.
Civil Engineering Journal Vol 10, No 9 (2024): September
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-09-07

The Clamped Split Pocket Mechanism (CSPM) prefabricated joint system was developed for a single-story steel instant house, designed to be compact and rapidly constructed without modifying the end of the beam and column element member. The CSPM bolted joint system was proposed as an optimal solution for post-disaster housing, especially after earthquakes. Despite its potential, the frictional tensile resistance behavior of the CSPM bolted joint system has not been previously studied, necessitating experimental investigation. This study examined the frictional tensile resistance behavior of the CSPM joint system by monitoring the effective friction coefficient under axial tension force. The experiments considered both the strong and weak axes of the joint and utilized two configuration types of specimens (L and T) with varying bolt pretensions of 2.5, 5, 7.5, and 10 kN. Results indicated that the effective friction coefficient of the CSPM bolted joint system ranged from 0.19 to 0.26, correlated to bolt pretension. Increased bolt pretension resulted in larger surface deformation of the split pocket, triggering a not uniform frictional tensile resistance across the steel surfaces of the split pocket joint. From this study, the achieved effective friction coefficients could guide the design of minimum pretension forces for clamps in prefabricated steel instant houses. Doi: 10.28991/CEJ-2024-010-09-07 Full Text: PDF

The Influence of Cement Type on Seawater-Affected Concrete Impermeability Arianto, Niky; Saputra, Ashar; Siswosukarto, Suprapto
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 20 No. 2 (2024): December
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v20i2.75738

The impermeability of concrete exposed to seawater is key in maintaining long-term structural integrity. In an exposed environment, concrete must be able to protect itself from seawater penetration which can potentially cause damage, corrosion and material degradation. This study aims to investigate the effect of different types of cement on the impermeability of concrete using Ground Granulated Blast-furnace (GGBFS) as concrete filler based on gradation to obtain dense concrete, especially when exposed to seawater during the maintenance period with age variations of 7, 28, and 56 days. Three types of cement available in the general public were used, namely, type V, Portland Composite Cement (PCC), Portland Pozzolan Cement (PPC). The research method used was experimental testing with 6 variations with the dimensions of a cylinder measuring 15x15x30 cm 3 and a cube measuring 15x15x15 cm3. The results obtained in the form of compressive strength test with the highest elastic modulus is cement type V GGBFS of 48.12 MPa with elastic modulus 38153.21 MPa while the smallest is Portland Pozzolan Cement (PPC) 35.93 MPa and 26339.61 MPa for elastic modulus. In this study, concrete mixes with Ground Granulated Blast Furnace Slag (GGBFS) showed a significant increase in compressive strength over time, despite initially having lower strength than regular cement mixes. The use of GGBFS in concrete offers long-term benefits, with the potential to achieve higher compressive strengths. This study demonstrates the importance of considering treatment time and the use of GGBFS in designing more durable and robust concrete mixes.

Studi Karakteristik Fondasi Pelat Tipis Dengan Pengaku Tiang “+” Pada Tanah Granuler Melalui Uji Eksperimen Dan Analisis Pemodelan Menggunakan Software Abaqus: Study of Characteristics of Thin Plate Foundation with Stiffener "+" in Granular Soil through Experimental Test and Analysis Modeling Using Abaqus Software Syarif, Firman; Adi, Agus Darmawan; Saputra, Ashar
JURNAL SAINTIS Vol. 17 No. 2 (2017)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1271.702 KB)

[EN] The amount of damage that happened in Indonesian road is the impact of high traffic load exceeds the carrying capacity of the pavement. To reduce the problems that occur on the pavement the good systems of pavement are built, various studies conducted to produce a creative innovation in order to evaluate and improve the performance of the pavement system. this study has developed a new system of foundation with pile "+" to make the connection between plate and minipile (joint) becomes better. In this study, three models of foundation will be tested by loading test (following ASTM D 114 381 and ASTM D 3689 Pile Under static axial compressive load) to observe and analyze the behavior of the foundation model by loading centric and eccentric. In addition to laboratory tests this research also modeling analysis with Abaqus software to observe and analyze the behavior of the foundation model in terms of deformation and settlement. The results showed the distances between pile and pile provides a significant contribution in reducing the settlement in the foundation when given a maximum load of 20 kN, where is the foundation 1 had short distance between the other foundation the deformation and settlement is the smallest. The length of pile also give significant contribution to reduce the settlement like in foundation 3 that have 20 cm length of the pile have settlement and deformatioan smaller than the foundation 2 that have 10 cm length of the pile

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