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All Journal Teknologi dan Kejuruan: Jurnal teknologi, Kejuruan dan Pengajarannya BANGUNAN (Jurnal Berkala Jurusan Teknik Sipil UM) BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Journal Innovation of Civil Engineering (JICE) Jurnal Lingkungan Binaan Indonesia Jurnal Pengabdian Kepada Masyarakat
B. Sri Umniati
Universitas Negeri Malang
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Public Health Social Sciences Transportation

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Journal : BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil

 1 
Sifat Mekanik Bata Ringan Geopolimer Berdasarkan Rasio Si/AL Fasya Khoirianti Rafrita; Siti Nur Rahmah Anwar; B. Sri Umniati
Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 11 No 2 (2023): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil (Juli 2023)
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v11i2.6773

Abstract

The use of fly ash or fly ash is still minimally applied in Indonesia. The percentage of fly ash utilization is only 10-12% with 73% on Java Island and 27% on other islands, so there will be an accumulation of fly ash of up to 10.4 million tons per year by 2027. Abundant fly ash can be utilized by making lightweight brick the main composition as a substitute for cement called geopolymer lightweight brick. The fly ash used is class F with mechanical testing based on the Si/Al ratio. This research was conducted to analyze the effect of activator content on mechanical testing consisting of compressive strength, split tensile strength, and modulus of rupture in order to obtain the mechanical properties of lightweight geopolymer bricks. The higher of the activator content, got the greater Si/Al ratio. The ratios at activator levels of 35, 40, and 45% were 2.42; 2.45; and 2.48. The difference between split tensile strength and compressive strength for 35% activator content is 6.45%; 40% is 5.94%; and 45% is 6.04% so it is included in high quality lightweight brick. The level of activator has a significant effect on the compressive strength, split tensile strength, and modulus of rupture. The lower Si/Al ratio results in higher and better compressive strength, split tensile strength, and modulus of rupture.
Penambahan Bambu Bulat Pada Balok Beton Pracetak Menggunakan Software Berbasis Elemen Hingga: Analysis of Adding Bamboo Culms on Precast Concrete Using Finite Element Based Software Kurniawan, Eka Yudha; Umniati, B. Sri; Karyadi, Karyadi
Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 12 No 1 (2024): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil (Januari 2024)
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v12i1.7252

Abstract

Post-earthquake development in Indonesia is a complex challenge that requires cross-sectoral efforts and support from various parties. Indonesia is prone to earthquakes due to its location on the Pacific Ring of Fire, an active area of earthquakes and volcanic activity. The use of precast concrete has a number of important advantages in earthquake-prone areas but the connection between joints can be a weak point if not done properly. This study will discuss the connection system, connection location, and details. The research method used is numerical analysis using finite element-based software. It is concluded that the connection system used has not been able to reach the capacity of the monolith beam without connection, while the addition of bamboo does not have a significant effect on the bending capacity of the beam.
Performance Based Design: Performance Analysis on Fixed Base Structure and Structures with High Damping Rubber Bearing (HDRB) Maulida, Alfia Salma Mei; Umniati, B. Sri; Sulton, Mohammad; Maulidani, Andra Akmal
Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 13 No 1 (2025): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil (January 2025)
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v13i1.10112

Abstract

Buildings in Malang City face large lateral load from earthquakes due to seismic activity. One method of reducing the lateral load is to use base isolators. Conventional building design resists lateral load by designing buildings to be elastic or rigid with Strength Based Design criteria. However, elasticity results in larger building elements, stiffness increases the building's exposure to earthquake forces, and Strength Based Design is unreliable in shielding from earthquakes since its recommended to be a minimum design criterion by FEMA P-424. Therefore, more comprehensive design criteria such as Performance Based Design are needed. The objective of this study is to assess the analysis results and performance levels of fixed base structure compared to structures with HDRB, including the effect of rubber thickness and shear modulus. This study starts by modeling a 7-story building with a fixed base structure using ETABS. The results were then used to determine the type of HDRB, from two models with different rubber thickness and shear modulus, for modeling structures with HDRB. Furthermore, the running results of the two structures are analyzed to evaluate the level of performance of the structures based on Performance Based Design criteria. The results showed differences with the reduction of the average period value by 91.51%, the base shear as 36.05% and 33.11% in longitudinal and transverse direction respectively, and the average interstory drift as 54.86% in X-axis and 31.17% Y-axis. The target displacement of the structures with HDRB decreases and the performance levels including the analysis results are improved.
Perbandingan Struktur Tuned Mass Damper dan Struktur Fixed Base dengan Metode Performance Base Design Maulidani, Andra Akmal; Sulton, Mohammad; Umniati, B. Sri; Maulida, Alfia Salma Mei
Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 13 No 1 (2025): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil (January 2025)
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v13i1.10113

Abstract

Indonesia's location in an earthquake zone with moderate to high intensity increases the urgency of planning high-rise earthquake-resistant buildings. Losses that occur due to the absence of procedures to predict earthquakes properly and accurately, make it important to innovate structural systems and evaluate their performance against earthquakes. This study aims to determine the impact of adding Tuned Mass Damper to buildings viewed from the level of structural performance compared to Fixed Base structures. Performance Base Design based on FEMA 440, is a design that categorizes the target damage to building structures into 4 levels of damage reviewed from the percentage of story deviation to the total height of the structure. Tuned Mass Damper is an innovation in structural systems consisting of mass, springs, and dampers installed to absorb their dynamic response. Pendulum Tuned Mass Damper is a Tuned Mass Damper system using a pendulum swinging relative to the floor motion. The addition of Tuned Mass Damper to Fixed Base type buildings causes a decrease in deviation of up to 19% from the original deviation depending on the mass ratio. This addition also reduces the value of the structural period by up to 9% with the period still below the maximum period standard. In addition, the addition of Tuned Mass Damper also reduces the target value of structural displacement based on FEMA 440 by 52% with the immediate occupancy building performance level.
Pengaruh Pengekangan CFRP Pada Kolom Beton Mutu Normal dan Mutu Tinggi Bertulangan Bambu Terhadap Kapasitas Beban Aksial dan Deformasi Kolom Pertiwi, Ziza Ayu; Umniati, B. Sri; Risdanareni, Puput
Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 13 No 2 (2025): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil (July 2025)
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v13i2.10923

Abstract

In the midst of the growing construction projects, the use of composite materials is widely applied, one of which is CFRP (Carbon Reinforced Polymer) which has high tensile strength with low density. The selection of bamboo reinforcement as an alternative material to replace steel is because bamboo has a tensile strength value that is close to the tensile strength of steel. However, bamboo has a weakness in its compressive strength. Therefore, this CFRP restraint is expected to be able to overcome these limitations with the aim of analyzing the effect of CFRP restraint on bamboo reinforced concrete columns with normal concrete quality (25 MPa) and high concrete quality (50 MPa), using CFRP layers of 0 and 2 layers. The experiment was conducted by making 4 square-section concrete columns, using Apus bamboo as the main reinforcement and spiral steel as a binder. After the casting and drying process, the columns were given a CFRP layer according to the variation. The results of the study showed that CFRP restraint could increase the axial load capacity by 6.07% for normal quality concrete columns and 5.58% for high quality concrete columns. In addition, normal quality concrete columns with CFRP restraints also reduce the maximum deformation value by 47.6% and for high quality concrete columns it reduces the maximum deformation value by 87.3%.
Co-Authors Anang Ansyori Christian Hadhinata Dian Ariestadi Eko Suwarno Fasya Khoirianti Rafrita Gatot Adi Susilo Isnandar Julieta Eka Yudho Putri Kartika Indah Wahyuni Karyadi Karyadi Kurniawan, Eka Yudha Lusty Mustikasari M. Mirza Abdillah Pratama Maulida, Alfia Salma Mei Maulidani, Andra Akmal Mohammad Sulton Muhtadi, Sabilul Pertiwi, Ziza Ayu Puput Risdanareni Siti Nur Rahmah Anwar Susanto, Prijono Bagus Syafa Aqilla Fadya Ummi Afifatul Mufida Wardana, Erik Fadilah Kusuma