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All Journal JTERA (Jurnal Teknologi Rekayasa) Jurnal Teknik Sipil dan Teknologi Konstruksi Journal of the Civil Engineering Forum
Zakiyyah, Amirah
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Efektifitas Gelagar Pci Girder Bentang 40 Meter Jembatan Integral Multispan Pilar Tinggi Akhbar, Try Kurniawan; Zakiyyah, Amirah; Puspitasari, Ira; Nurdin, Muhammad Irfan
Jurnal Teknik Sipil dan Teknologi Konstruksi Vol 11, No 2 (2025): JURNAL TEKNIK SIPIL DAN TEKNOLOGI KONSTRUKSI
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jts-utu.v11i2.13639

Abstract

 Integral bridges are a type of bridge designed without the use of expansion joints or dilation gaps, allowing the superstructure and substructure to act monolithically without relative movement. In Indonesia, the application of integral bridge concepts is limited. Generally, bridges in the country are designed using simple-span systems with conventional bearings, which, despite their straightforward construction, require periodic maintenance and replacement. Precast prestressed concrete (PCI) girders have been implemented in several integral bridge designs in Indonesia; however, their application is restricted, particularly for piers of considerable size or height. This study aims to determine the maximum pier height applicable for multispan integral bridges utilizing PCI girders commonly available in the market. The investigation focuses on girders with a span length of 40 meters, given their widespread use in Indonesia. Structural modeling was carried out for pier heights ranging from 30 to 60 meters, considering structural behavior during both construction stages and service conditions. The results indicate that for a pier height of 30 meters, the stresses in the PCI girder remain within permissible limits. However, when the pier height increases to 40 meters, the stress exceeded allowable thresholds. Therefore, the use of standard PCI girders with a 40-meter span under such conditions is not recommended unless supported by design modifications or advanced construction technologies. It is thus concluded that 40-meter PCI girders are effective for integral bridge applications with pier heights below 30 meters.
Kajian Eksperimental Pemanfaatan Limbah Batu Kerajinan Sebagai Agregat Limbah Pada Beton Puspitasari, Ira; Zaidulfar, Harianto; Kurniawan Akhbar, Try; Nurdin, Muhamad Irfan; Zakiyyah, Amirah
JTERA (Jurnal Teknologi Rekayasa) Vol 10, No 2: Desember 2025
Publisher : Politeknik Sukabumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31544/jtera.v10.i2.2025.9-16

Abstract

Beton adalah material konstruksi yang diperoleh dari pencampuran pasir, kerikil/agregat kasar, semen serta air. Di sisi lain penggunaan kerikil yang merupakan sumber daya alam yang tidak dapat diperbaharui secara terus menerus sebagai bahan beton dikhawatirkan merusak lingkungan. Dalam mengatasi isu itu maka riset tentang konstruksi hijau (Green Construction) mulai digalakkan dengan salah satunya adalah pemanfaatan limbah batu kerajinan di Padalarang. Tujuan penelitian adalah mengetahui komposisi optimum agregat kasar dari limbah pada beton sehingga menghasilkan kuat tekan yang maksimum. Tahapan Pertama dalam penelitian ini adalah pengumpulan data selanjutnya adalah analisis Laboratorium meliputi uji sifat teknis material penyusun beton yang meliputi pasir , kerikil alami dan kerikil dari limbah batu kerajinan. Selanjutnya proses mix desain dimana penelitian dilakukan dengan 30 benda uji dengan komposisi antara split dan limbah adalah 100% : 0%, 80% : 20%, 60% : 40%, 40% : 60%, 20% : 80% dan 0 % :100 %, masing masing komposisi berjumlah lima benda uji. Pengujian meliputi berat jenis, kuat tekan dan modulus elastisitas beton. Hasil penelitian menunjukkan kuat tekan maksimum diperoleh pada proporsi 40% split dan 60% limbah yaitu 14.35 MPa. Modulus elastisitas maksimum diperoleh pada proporsi 20% split dan 80% limbah yaitu 18367.8 MPa.
Structural Evaluation of Reinforced Concrete Beams Retrofitted using Cold-Formed Steel Plates Susanto, Ambar; Wusqo, Urwatul; Zakiyyah, Amirah; Puspitasari, Ira; Kasyanto, Heri; Oesman, Mardiana; Susilahadi
Journal of the Civil Engineering Forum Vol. 12 No. 2 (May 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.24631

Abstract

Shear strengthening of reinforced concrete (RC) beams has become increasingly important for improving the safety and durability of existing structures. This study focuses on the behavior of RC beams strengthened using cold-formed steel plates installed diagonally at a 45-degree angle. Two beam specimens with dimensions of 250 × 400 × 1500 mm were tested under continuous loading: a control beam (B0) without strengthening and a strengthened beam (B1) with a single cold-formed steel plate bonded to the beam web. Additionally, a Linear Variable Differential Transformer (LVDT) was installed at midspan, ¼ span, and ¾ span to monitor deflections, with all instrumentation connected to a data acquisition system. Test results showed that the initial yielding load for the control specimen B0 was 283.07 kN, while the strengthened specimen B1 yielded at 288.91 kN, indicating a 2.44% increase in initial yield load due to the presence of the cold-formed steel plate. Loading was continued up to 350 kN, at which point the midspan deflection of B0 was measured at 21.40 mm, whereas B1 exhibited a lower deflection of 17.81 mm, demonstrating improved stiffness and reduced deformation. The shear capacity of the beams, which includes contributions from both the concrete and shear reinforcement, was calculated as 145.59 kN. This shear capacity corresponded to a total applied load of 291.18 kN, marking the limit at which shear failure is expected to occur. The cracks on the both left and right side of the beams seem symmetrically and there is no separation between the concrete and the cold-formed steel plates. The study confirms that retrofitting RC beams with diagonally installed cold-formed steel plates can effectively enhance their shear capacity and stiffness. This strengthening technique offers a practical and efficient method for extending the service life of existing concrete structures.
Co-Authors Akhbar, Try Kurniawan Ambar Susanto, Ambar Heri Kasyanto, Heri Ira Puspitasari Kurniawan Akhbar, Try Nurdin, Muhamad Irfan Nurdin, Muhammad Irfan Oesman, Mardiana Susilahadi Wusqo, Urwatul Zaidulfar, Harianto