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Evaluasi Perancangan Kolom Beton Bertulang dengan Metode Elemen Hingga Bayzoni Bayzoni; Laksmi Irianti; Vera Chania Putri
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 20, No 3 (2016): Edisi Desember 2016
Publisher : UNIVERSITAS LAMPUNG

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The design of a column is performed particularly to prevent any excessive deformation when it is used to support working load, and still have sufficient safety and reserve strength to withstand the load and stress without experiencing the collapse. The process of design or analysis generally begins with a compliant againt flexure, and the other requirements such as shear, crack, anchorage length were so that all requirment satisfied. The aim of this research is to get the stress of reinforced concrete column using the finite element method, so that it can get an evaluation of the design of reinforced concrete columns by comparing the stress design with the stress obtained from the finite element method. The calculations result shown that the enlargement deflection in horizontal direction is greater than the value of the enlargement deflection in vertical direction, that cause of the influence of axial forced and bending moment. From the results of stress analysis in steel and concrete by using the finite element method has a value less than fy and f'c used in the design. This shows the reinforced concrete column can withstand a greater load than the load value which was assumed the column on the balance condition

Pengaruh Penambahan Serat Baja dan Serat Polypropylene Terhadap Kuat Tekan dan Kuat Lentur Beton Novia Puja; Vera Agustriana; Laksmi Irianti
Jurnal Rekayasa Sipil dan Desain Vol 8, No 4 (2020): Edisi Desember 2020
Publisher : Jurnal Rekayasa Sipil dan Desain

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Beton memiliki kelebihan dan kekurangan, kekurangan beton tidak dapat menahan tarik. Kekurangan ini dapat diatasi dengan menambahkan serat ke dalam beton sebagai tulangan mikro yang tersebar secara acak dalam beton. Penambahan serat bertujuan untuk meningkatkan kekuatan tarik pada beton. Pada penelitian ini, sifat mekanik yang diteliti ialah kuat tekan dan kuat lentur beton, sedangkan serat yang digunakan yaitu serat baja dan serat polypropylene. Benda uji kuat tekan berupa kubus dengan dimensi 15x15x15 cm, benda uji kuat lentur berupa balok dengan dimensi 40x10x10 cm. Variasi serat baja terdiri dari (0%; 0,5%; 1%; 1,5%) dan serat polypropylene terdiri dari (0%; 0,05%; 0,1%; 0,15%). Serat tersebut dicampurkan ke dalam beton dengan mengombinasikanserat baja dan serat polypropylene. Kuat tekan beton rencana yaitu (f’c) 25 MPa, pengujian dilakukan setelah 28 hari. Berdasarkan hasil penelitian penambahan serat baja meningkatkan kuat tekan beton pada volume fraction optimal yaitu 1% dan meningkatkan kuat lentur beton seiring bertambahnya volume fraction. Penambahan serat polypropylene meningkatkan kuat tekan beton seiring bertambahnya volume fraction dan tidak mempengaruhi kuat lentur beton.

Pengaruh Penambahan Fiber Baja Seling dengan Volume Fraction 0,4%, 0,6% dan 0,8% terhadap Kuat Tekan dan Kuat Tarik Lentur pada Beton Mutu Normal. Tiffany Marvin; Eddy Purwanto; Laksmi Irianti
Jurnal Rekayasa Sipil dan Desain Vol 4, No 3 (2016): Edisi September 2016
Publisher : Jurnal Rekayasa Sipil dan Desain

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This research was conducted to study and determine the influence of steel sling fiber 0,4%, 0,6% and 0,8% volume fraction of compressive strength and flexural strength on normal quality concrete. This study used an experimental method in the Laboratory of Material and Construction Engineering Faculty, University of Lampung. The compressive strength test specimen is a 30 cm height and 15 cm diameter cylinder and the flexural strength test specimen is a 40 cm length, 10 cm width and 10 cm height beam. The compressive strength and flexural strength test of normal quality concrete with 0,4%, 0,6% and 0,8% volume fraction held after 14 and 28 days. The maximum compressive strength and flexural strength value are at 0,6% volume fraction and decrease at 0,8% volume fraction. The maximum compressive strength is 27,5537 MPa at 0,6% volume fraction and the optimum value from polynomial trendline chart is 27,6028 MPa at 0,5754% volume fraction. The maximum flexural strength is 5,6899 MPa at 0,6% volume fraction and the optimum value from polynomial trendline chart is 5,7163 MPa at 0,5687% volume fraction. The steel sling fiber didn’t affect a high increase of the compressive strength, but this steel sling fiber had a high flexural strength which is 1733,46 MPa, so it affected a significant increase of the flexural strength test.Keywords : compressive strength, flexural strength, fiber concrete, steel sling fiber

Pengaruh Variasi Serat Polypropylene dan Faktor Air Semen Pada Uji Kuat Tekan, Kuat Tarik Belah dan Kuat Lentur Self Compacting Concrete (SCC) Melinda Gusti; Vera Agustriana Noorhidana; Laksmi Irianti
Jurnal Rekayasa Sipil dan Desain Vol 9, No 1 (2021): Edisi Maret 2021
Publisher : Jurnal Rekayasa Sipil dan Desain

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Self compacting concrete (SCC) adalahinovasi beton konvensional dalam menyesuaikan kebutuhan proses konsruksidengan tulangan rapat yang tidak memerlukan pemadatan. Pada penelitian ini sampel dibuat dalam 2 FAS yaitu 0,38 dan 0,5 dengan diberi penambahan serat polypropylene dengan volume fraksi sebesar 0%; 0,05%; 0,10% dan 0,15%. Penambahan ini dilakukan untuk mengetahui pengaruh serat polypropylene pada pada fas 0,38 dan 0,5 terhadap kuat tekan, kuat tarik belah dan kuat lentur. Sampel dalam penelitian ini adalah kubus (15 x 15 x 15 cm) untuk pengujian kuat tekan, silinder (diameter 15 cm dan tinggu 30 cm) untuk pengujian kuat tarik belah, dan balok (10 x 10 x 40 cm) untuk pengujian kuat lentur beton. Kemudian ketiganya diuji pada umur 28 hari.Pada FAS 0,38 dengan penambahan polypropylene sebesar 0,05% terjadi peningkatan nilai kuat tekan beton dari 43,90 MPa menjadi 45,38 MPa, nilai kuat tarik belah dari 2,67 MPa menjadi 4,04 MPa, dan nilai kuat lentur beton dari 2,25 MPa menjadi 6,62 MPa dari beton tanpa serat. Pada FAS 0,5 dengan penambahan polypropylene sebesar 0,05% terjadi peningkatan nilai kuat tekan beton dari 28,38 MPa menjadi 31,83 MPa, nilai kuat tarik belah dari 2,66 MPa menjadi 2,75 MPa, dan nilai kuat lentur beton dari 1,61 MPa menjadi 5,69 MPa dari beton tanpa serat.

Analisis Joint Balok Kolom dengan Metode SNI 2847-2013 dan ACI 352R-2002 pada Hotel Serela Lampung Eddy Ristanto; Suyadi Suyadi; Laksmi Irianti
Jurnal Rekayasa Sipil dan Desain Vol 3, No 3 (2015): Edisi September 2015
Publisher : Jurnal Rekayasa Sipil dan Desain

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This study aimed to analyze the relationship beam-column design at Building Serela LampungHotel, which refers to SNI 2847-2013 and Methods ACI 352R-2002. In the analysis, the existingshear force on beam-column joint relationship is greater than the shear forces that are on thebeams and columns. Therefore it is necessary that the relationship between the shearreinforcement. From a review of existing columns and beam size is sufficient to carry the shearforces that occur. There are differences between the results of the review of planning method SNI2847-2013 and methods ACI 352R-2002. From the results obtained with SNI 2847-2013 shearforce to review the interior, roof interior, exterior, roof exterior, corner, and roof cornersequentially as follows: 1682.544 KN; 1380.365 KN; 607.759 KN; 364.932 KN; 607.759 KN;364.932 KN. While the method of ACI 352R-2002 as follows: 1712.750 KN; 1440.799 KN;632.642 KN; 413.498 KN; 632.642 KN; 413.498 KN. Although both methods are considered safein the planning of the object of study Serela Lampung Hotel but in general planning methods ACI352R-2002 a higher level of safety and efficiency in terms of planning method SNI 2847-2013 evengreater levels of efficiency.Keywords: SNI 2847-2013, ACI 352R-2002, joint, beams, columns, seismic load, shear force,inelastic.

Pengaruh Penambahan Fiber Baja Seling Dengan Volume Fraction 0,4% Terhadap Kuat Tekan dan Kuat Tarik Lentur dengan Tinggi Beton Serat 0; 0,25; 0,50; 0,75 dan 1 Pada Beton Mutu Normal bagus bimantara; Eddy Purwanto; Laksmi Irianti
Jurnal Rekayasa Sipil dan Desain Vol 4, No 4 (2016): Edisi Desember 2016
Publisher : Jurnal Rekayasa Sipil dan Desain

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AbstractConcrete is one of the important parts in the development of infrastructure building. Many advantages obtained from the use of concrete, nevertheless there is a shortage which is weak against tensile and ductile. The weakness of concrete can be improved by adding fiber into the concrete mix evenly with random orientation. This study was conducted to determine the effect of addition of wire rope fiber on compressive strength and flexural tensile strength with the height of fiber-reinforced concrete 0; 0.25; 0.50; 0.75 and 1 on normal strength concrete. This study used an experimental method which is conducted at the Laboratory of Materials and Construction Faculty of Engineering, University of Lampung. The sample for compressive strength test is a cylinder with a diameter of 15 cm and 30 cm in height, while the sample for flexural tensile strength test is a block with a length of 40 cm, 10 cm in width and 10 cm in height. The testing for the compressive strength and flexural tensilestrength of normal concrete with high-quality fiber-reinforced concrete 0; 0.25; 0.50; 0.75 and 1 performed after 14 and 28 days. Maximum compressive strength and flexural strength occurs at a height of 0,75 fiber-reinforced concrete. The maximum compressive strength is 27.3649 MPa, increasedby 3.5714%. The maximum flexural strength is 5.4880 MPa, increasedby 18.9475%. The addition of wire rope fiber does not make a major contribution to the increase of compressive strength, but the flexural tensile strength. The wire rope fiber in this study has high tensile strength, i.e. 1733.46 MPa so it can provide a significant increase in the flexural strength. Keywords : compressive strength, flexural strength, fiber concrete, wire rope fiber AbstrakBeton merupakan salah satu bagian penting dalam perkembangan infrastruktur bangunan. Banyak kelebihan yang didapatkan dari penggunaan beton, meskipun demikian terdapat kekurangan yaitu lemah terhadap tarik dan bersifat getas. Kelemahan beton dapat diperbaiki dengan menambah serat kedalam adukan beton secara merata dengan orientasi acak. Penelitian ini dilakukan untuk mengetahui pengaruh penambahan serat baja seling terhadap kuat tekan dan kuat tarik lentur dengan tinggi beton serat 0; 0,25; 0,50; 0,75 dan 1 pada beton mutu normal. Studi ini menggunakan metode eksperimen yang dilakukan di Laboratorium Bahan dan Konstruksi Fakultas Teknik Universitas Lampung. Benda uji kuat tekan berupa silinder dengan diameter 15 cm dan tinggi 30 cm, benda uji kuat lentur berupa balok dengan panjang 40 cm, lebar 10 cm dan tinggi 10 cm. Pengujian kuat tekan dan kuat lentur beton mutu normal dengan tinggi beton serat 0; 0,25; 0,50; 0,75 dan 1 dilakukan setelah 14 dan 28 hari. Kuat tekan dan kuat lentur maksimal terjadi pada ketinggian beton serat 0,75. Kuat tekan maksimal sebesar 27,3649 MPa, meningkat sebesar 3,5714%. Kuat lentur maksimal sebesar 5,4880 MPa, meningkat sebesar 18,9475%. Penambahan serat baja seling tidak memberikan kontribusi yang besar dalam peningkatan kuat tekan, akan tetapi pada kuat tarik lentur. Serat baja seling pada penelitian ini mempunyai kuat tarik yang tinggi, yaitu 1733,46 MPa sehingga dapat memberikan peningkatan kuat lentur yang signifikan. Kata kunci : kuat tekan, kuat lentur, beton serat, serat baja seling.

Analisis Pengaruh Penggunaan Serat Polypropylene Terhadap Self Compacting Concrete (SCC) dengan Bahan Dasar Agregat Kasar Gradasi Senjang (Gap-Grading) Adipati Syahidullah Ulini'am; Vera Agustriana Noorhidana; Laksmi Irianti; Mohd Isneini
Jurnal Rekayasa Sipil dan Desain Vol 9, No 2 (2021): Edisi Juni 2021
Publisher : Jurnal Rekayasa Sipil dan Desain

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In general, Self Compacting Concrete (SCC) uses coarse aggreggate with dense graded for mix composition. However, in certain places, sometimes the sources of aggreggate are limited and there’s no stone crusher with possibly use coarse aggreggate with gap graded. H. This research was conducted for investigate the effect of polypropylene fiber additions to SCC with gap graded on workability, compressive strength, splitting tensile strength, and bending strength. Test result for Slump-Flow and T50 for both of gradation with Vf 0%, 0,05%, and 0,1% quilify that Slump-Flow are about 50-65 cm and T50 are 3-15 second. Test result for compressive strength of SCC with gap graded, the optimum Vf is 0,05% with 7,02% increase in strength compared to dense graded with 0% Vf. Test result for split tensile strength of SCC with gap graded, the optimum Vf is 0,05% with 45,53% increase in strength compared to dense graded with 0% Vf. Test result for bending strength of SCC with gap graded, the optimum Vf is 0,05% with 347,28% increase in strength compared to dense graded with 0% Vf.

PERBANDINGAN PENGARUH PENAMBAHAN SERAT BENDRAT LURUS (STRAIGHT) DENGAN SERAT BENDRAT BERKAIT (HOOKED) TERHADAP PERILAKU BETON DENGAN BEBAN TEKAN BERULANG Poppy Nitiranda Faizah; Eddy Purwanto; Laksmi Irianti
Jurnal Rekayasa Sipil dan Desain Vol 5, No 2 (2017): Edisi Juni 2017
Publisher : Jurnal Rekayasa Sipil dan Desain

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In this research, the concrete mixture is added by the material of straight and hooked wire bendrat fibers. This addition aimed to study and compare the effect of adding bendrat fiber straight and hooked to the compressive strength, tensile strength and flexural strength in normal quality concrete with 0.75% fiber concentration and aspect ratio 60 with repeated press load. The test specimen compressive and tensile strength in the form of cylinders with a diameter of 15 cm and height 30 cm and the flexural strength test specimen in the form of beam with a length of 60 cm, width 15 cm and height 15 cm. Testing is done after 28 days. Concrete with additional hooked bendrat fiber is more able to withstand fatigue due to repeated load that generates more experienced loading intervals until concrete destroyed, the compressive strength at the 13th interval, 14th tensile and 6th flexural. The compressive strength, tensile and flexural maximum split value occurred in the concrete with the addition of hooked bendrat fiber. However, the value did not increase significantly between the variations of straight bendrat fiber with hooked bendrat fiber. The maximum compressive strength in the hooked bendrat fiber of 34.5189 MPa, tensile strength of 3.2067 MPa and flexural strength of 8.9380 MPa.______ Key words: bendrat fiber, repeated press load, compressive strength, tensile strength, flexural strength.

Karakteristik Distribusi Curah Hujan Di Wilayah Sungai Mesuji - Sekampung Philipus Philipus; Gatot Eko Susilo; Laksmi Irianti
Jurnal Rekayasa Sipil dan Desain Vol 8, No 1 (2020): Edisi Maret 2020
Publisher : Jurnal Rekayasa Sipil dan Desain

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Penelitian ini bertujuan untuk menganalisa metode analisis frekuensi yang paling dominan di wilayah sungai Mesuji–Sekampung serta membandingkan hasilnya dengan data di lapangan. Metode analisis frekuensi yang digunakan yaitu metode Normal, Gumbel dan Log Pearson III. Selanjutnya metode analisis frekuensi tersebut digunakan untuk mencari nilai hujan rancangan dua tahunan, lima tahunan, sepuluh tahunan. Adapun data yang digunakan adalah data hujan harian maksimum tahunan dari 15 stasiun pancatat curah hujan disepanjang sungai Mesuji-Sekampung. Uji probabilitas yang digunakan adalah metode Chi-Kuadrat serta penggunaan batas atas dan batas bawah untuk memastikan hasil analisis sudah sesuai standar. Selanjutnya membandingkan hasil analisis dengan data di lapangan. Perhitungan analisis frekuensi menggunakan ketiga metode di atas dari 15 stasiun pencatat curah hujan di hitung seluruhnya. Hasil perhitungan lalu diuji menggunakan metode Chi-kuadarat dan hasilnya yaitu, metode Normal dapat diterima di 14 stasiun, metode Gumbel diterima di 11 stasiun, metode Log Pearson III diterima di 12 stasiun. Selanjutnya hasil tersebut baik hujan rancangan dua tahunan, hujan rancangan lima tahunan dan hujan rancangan sepuluh tahunan masih dalam angka aman karena tidak keluar dari batasan yang sudah dibuat, yaitu 105 % dari rata – rata hujan rancangan T tahun untuk batas atas dan 95 % untuk batas bawah. Perbandingan Hasil analisis frekuensi untuk hujan rancangan T tahun metode Normal efektif digunakan di 7 stasiun, mtode Gumbel efektif digunakan di 4 stasiun, sedangkan untuk metode Log Pearson III efektif digunakan di 4 stasiun. Kata kunci : analisis frekuensi, hujan rancangan, Normal, Gumbel, Log Pearson III

Analisis Perbandingan Pengaruh Campuran Kawat Bendrat dan Serat Baja pada Self Compacting Concrete (SCC) Sylvia Dewi Anggraeni; Vera Agustriana Noorhidana; Laksmi Irianti; Mohd. Isneini
Jurnal Rekayasa Sipil dan Desain Vol 10, No 2 (2022): Edisi Juni 2022
Publisher : Jurnal Rekayasa Sipil dan Desain

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Self compacting concrete (SCC) is a concrete innovation that is carried out to overcome problems during casting that does not require manual compaction even in hard-to-reach places such as tight reinforcement. In this study, 3D Dramix steel fibers and bendrat wire were used as a mixture in SCC with volume fractions of 0%, 0.5%, 1%, 1.5%. The addition of this fiber aims to determine the effect of the two fibers on SCC on compressive strength, split tensile strength and flexural tensile strength. The sample in this study was a cylinder with a diameter of 150 mm and a height of 300 mm for testing the compressive strength and split tensile strength while the flexural tensile strength used a beam sample with a size of 100x100x400 mm. All samples of these specimens were tested when the concrete was 28 days old. The increase in the value of compressive strength, split tensile strength and flexural strength at the addition of 1.5% steel fiber were 26.39%, 64.71% and 111.88% respectively for concrete with 0% fiber. While the increase in compressive strength, split tensile strength and flexural strength with the addition of 1.5% bendrat wire was 20.31%, 60.74% and 76.18% for concrete with 0% fiber, respectively.

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