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PERBANDINGAN ERECTION RANGKA BAJA JEMBATAN DENGAN MENGGUNAKAN MAST CRANE DAN TOWER CRANE PADA PROYEK JEMBATAN TRISULA BLITAR Agnes Hanna Patty, Armin Naibaho, Singgih Fitra Utama,
Prokons: Jurnal Teknik Sipil Vol. 8 No. 2 Agustus 2014
Publisher : Jurusan Teknik Sipil, Politeknik Negeri Malang

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

Abstract

At Trisula bridge project Blitar, Mast Crane (MC) ?was used for the erection of steel frame bridge while Tower Crane? (TC) was an alternative for the implementation of structure work. The purpose of the study is compare the two? cranes in terms of time and cost. The bridge is of 70 m span; the maximum length of MC can reach is of 3 m and TC is of 40 m. The data of daily, weekly, and monthly report and the 18-week planned S ? Curve were needed to find out the implementation time. The implementation cost was calculated from the setting cost of S ? Curve at IDR 739.883.800,00. Pylon method was ratio of maximum strand force 0,914 for MC and 0,924 for TC.The calculations result in 283,065 hours of MC use at IDR 739.883.800,00. And 161,219 hours of TC use at IDR 1.056.436.000,00.Keywords: comparison, erection, frame.
PENGONTROLAN RETAK PADA BETON DENGAN OPTIMALISASI INTERAKSI KOMPOSIT BETON PADA INTERFACE ZONE Muin, Resmi Bestari; Alva, Sagir; Patty, Agnes Hanna; Fidi, Fidi; Arianti, Adelfy Dara
Jurnal Teknik Sipil Vol 27, No 1 (2020)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2020.27.1.7

Abstract

AbstrakStudi ini melakukan kajian yang signifikan terhadap kemungkinan terjadinya retak awal dan perambatannya yang rentan terjadi pada struktur-struktur di daerah marine. Retak beton yang terjadi merambat terutama di sepanjang interface zone yang secara signifikan dikondisikan oleh karakteristik agregat. Karakteristik agregat sebagai pengisi beton memiliki peran signifikan sebagai media pelepasan energi regangan dan dikenal sebagai energi fraktur. Hubungan energi fraktur dengan sifat material belum diidentifikasi secara jelas, dan sebagian besar studi menunjukkan ketidakpekaan relatif terhadap faktor air-semen, di mana retakan beton merambat terutama di sepanjang antarmuka agregat-semen. Penelitian ini merupakan penelitian eksperimental tentang karakteristik fraktur beton dengan variasi gradasi agregat kasar diameter maksimum 25 mm dan 20 mm, serta variasi faktor air-semen (w/c rasio) 0,30, 0,40 dan 0,6 dengan diameter maksimum agregat kasar 19 mm.   Eksperimen meliputi uji kuat tekan dan uji parameter fraktur yang terdiri dari energi fraktur dan faktor intensitas tegangan. Tes lentur tiga titik dipilih berdasarkan rekomendasi RILEM untuk menghitung parameter fraktur.Hasil penelitian menunjukkan bahwa gradasi agregat yang digunakan dalam campuran beton mempengaruhi energi fraktur beton. Energi puncak tertinggi didapat dengan menggunakan gradasi agregat menerus. Ukuran maksimum agregat mempunyai pengaruh yang signifikan terhadap energi fraktur. Semakin besar ukuran maksimum agregat dalam campuran beton, semakin tinggi energi puncak yang dicapai. Gradasi seragam dengan ukuran maksimum yang lebih kecil memiliki nilai kuat tekan yang tinggi namun energi fraktur yang rendah. Kuat tekan meningkat dengan menurunnya w/c rasio air-semen, sedangkan energi fraktur tidak memberikan pola yang sama dengan kuat tekan dengan perubahan w/c rasio.  AbstractThis study conducts a significant study of the possibility of initial cracking and its propagation, which is susceptible to concrete structures. Concrete cracks that occur propagate mainly along the interface (interface zone) which is significantly influenced by the cement water factor and aggregate characteristics, as a concrete filler have a significant role as a strain energy release media known as fracture energy (GF). The relationship of fracture energy to material properties has not been clearly identified, besides that most studies show a relative insensitivity to the water-cement factor, where concrete cracks propagate mainly along the aggregate-cement interface. This study is an experimental study of the characteristics of concrete fractures with variations in coarse aggregate gradations, namely uniform coarse gradations with the maximum diameter of 25 mm (25 S) and 20 mm (20 S); continuous coarse aggregate with the maximum diameter of 25 mm (25 M), as well as variations in the water-cement factor (w / c ratio): 0.30 (HSC); 0.40 (MSC) and 0.6 (NSC) with a coarse aggregate maximum diameter of 19 mm. Experiments include compressive strength tests and concrete fracture property tests consisting of fracture energy
PENERAPAN VALUE ENGINEERING PADA PROYEK PEMBANGUNAN KANTOR TANAMAN DAN TUK PG. KEBON AGUNG MALANG Devi Zettyara, Wahiddin, Agnes Hanna Patty
Prokons: Jurnal Teknik Sipil Vol. 9 No. 2 August 2015
Publisher : Jurusan Teknik Sipil, Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/prokons.v9i2.93

Abstract

Completed with the project price of IDR 10,750,900,000.00, the 4-floor office in the area of about 6,688 m2 is located on Jl. Raya Kebon Agung Malang. The existing beam was constructed using concrete beam. The objective of analysis is to make alternatives of beam work by employing Value Engineering (VE) analysis in order to find out the most efficient price. The three beam works to alternate the existing are (1) I section concrete beam, (2) T section concrete beam and (3) composite beam. The analysis started with a literature study in VE references, material cost, and beam work of the project. Next, the structure strength and cost of the existing beam was analyzed followed by the analyses of each alternatives. Finally, the structure strength and cost the existing beam and the alternatives were compared. The results of the study shows structurally the smaller sectional shape the smaller the value of øMn and Mu are produced. In term of cost, the alternative that has the greatest value of saving is alternative 2 or T-shaped concrete beam of 29.39%.Keywords: value engineering, cost saving, beam structure
Pengontrolan Retak pada Beton dengan Optimalisasi Interaksi Komposit Beton pada Interface Zone Resmi Bestari Muin; Sagir Alva; Agnes Hanna Patty; Fidi Fidi; Adelfy Dara Arianti
Jurnal Teknik Sipil Vol 27 No 1 (2020)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2020.27.1.7

Abstract

AbstrakStudi ini melakukan kajian yang signifikan terhadap kemungkinan terjadinya retak awal dan perambatannya yang rentan terjadi pada struktur-struktur di daerah marine. Retak beton yang terjadi merambat terutama di sepanjang interface zone yang secara signifikan dikondisikan oleh karakteristik agregat. Karakteristik agregat sebagai pengisi beton memiliki peran signifikan sebagai media pelepasan energi regangan dan dikenal sebagai energi fraktur. Hubungan energi fraktur dengan sifat material belum diidentifikasi secara jelas, dan sebagian besar studi menunjukkan ketidakpekaan relatif terhadap faktor air-semen, di mana retakan beton merambat terutama di sepanjang antarmuka agregat-semen. Penelitian ini merupakan penelitian eksperimental tentang karakteristik fraktur beton dengan variasi gradasi agregat kasar diameter maksimum 25 mm dan 20 mm, serta variasi faktor air-semen (w/c rasio) 0,30, 0,40 dan 0,6 dengan diameter maksimum agregat kasar 19 mm.   Eksperimen meliputi uji kuat tekan dan uji parameter fraktur yang terdiri dari energi fraktur dan faktor intensitas tegangan. Tes lentur tiga titik dipilih berdasarkan rekomendasi RILEM untuk menghitung parameter fraktur.Hasil penelitian menunjukkan bahwa gradasi agregat yang digunakan dalam campuran beton mempengaruhi energi fraktur beton. Energi puncak tertinggi didapat dengan menggunakan gradasi agregat menerus. Ukuran maksimum agregat mempunyai pengaruh yang signifikan terhadap energi fraktur. Semakin besar ukuran maksimum agregat dalam campuran beton, semakin tinggi energi puncak yang dicapai. Gradasi seragam dengan ukuran maksimum yang lebih kecil memiliki nilai kuat tekan yang tinggi namun energi fraktur yang rendah. Kuat tekan meningkat dengan menurunnya w/c rasio air-semen, sedangkan energi fraktur tidak memberikan pola yang sama dengan kuat tekan dengan perubahan w/c rasio.  AbstractThis study conducts a significant study of the possibility of initial cracking and its propagation, which is susceptible to concrete structures. Concrete cracks that occur propagate mainly along the interface (interface zone) which is significantly influenced by the cement water factor and aggregate characteristics, as a concrete filler have a significant role as a strain energy release media known as fracture energy (GF). The relationship of fracture energy to material properties has not been clearly identified, besides that most studies show a relative insensitivity to the water-cement factor, where concrete cracks propagate mainly along the aggregate-cement interface. This study is an experimental study of the characteristics of concrete fractures with variations in coarse aggregate gradations, namely uniform coarse gradations with the maximum diameter of 25 mm (25 S) and 20 mm (20 S); continuous coarse aggregate with the maximum diameter of 25 mm (25 M), as well as variations in the water-cement factor (w / c ratio): 0.30 (HSC); 0.40 (MSC) and 0.6 (NSC) with a coarse aggregate maximum diameter of 19 mm. Experiments include compressive strength tests and concrete fracture property tests consisting of fracture energy
Review Kuat Tekan Beton Polos dari Perspektif Mekanika Fraktur Danang Murdiyanto; Benedictus Sonny Yoedono; Agnes Hanna Patty
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 3, No 2 (2018): EDISI SEPTEMBER 2018
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v3i2.1018

Abstract

Concrete is a discreet material that consist of aggregate as filler and cement paste (matrix) as binder. Both of them work together as a composite or monolithic mechanism, depends on the interface zone characteristic that developed by aggregate. Monolithic mechanism leading to failure catastrophically (brittle and instantly), while composite mechanism prevails failure occurs gradually. Monolithic mechanism maybe found in high strength concrete where hardness and stiffness of aggregate are compatible with their matrix. At the moment when the matrix tensile strength (ft) is reached. The cracks will propagate quickly cutting both aggregates and matrix, as well at once. Contrary to the composite condition, when the matrix tensile strength is reached, the aggregate will take over the load and the crack will propagate through the interface zone. The perspective of fracture mechanics and the failure parameters explain the mechanism of crack propagation based on the energy principles. This investigation reviews the phenomenon of concrete compressive strength with angular aggregates compared to rounded aggregates on cylindrical specimens with diameter (d) 15 cm and height (h) 30 cm of the same compressive strength.  The difference between them, shows the tendency of the influence of the interface zone as traction, which significantly contributes to the performance capacity before  collapse