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All Journal KERN U Karst RACIC : Rab Construction Research Jurnal Manajemen Teknologi dan Teknik Sipil (JURMATEKS) Nusantara Science and Technology Proceedings Jurnal Sains Teknologi dalam Pemberdayaan Masyarakat AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Al Ulum: LPPM Universitas Al Washliyah Medan KERN : Jurnal Ilmiah Teknik Sipil Journal of Civil Engineering, Planning, and Design (JCEPD)
wahyu kartini
Universitas Pembangunan Nasional Veteran Jawa Timur
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PENGARUH PENAMBAHAN SERAT FIBERGLASS TERHADAP KUAT TEKAN DAN KUAT TARIK BELAH BETON Ramayati, Novita Dwi; Kartini, Wahyu; Sumaidi, Sumaidi
Jurnal Al Ulum LPPM Universitas Al Washliyah Medan Vol. 12 No. 2 (2024): Jurnal Al Ulum: LPPM Universitas Al Washliyah Medan
Publisher : UNIVERSITAS AL WASHLIYAH (UNIVA) MEDAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47662/alulum.v12i2.561

Abstract

Tujuan penelitian ini adalah untuk menentukana kadar optimal penambahan serat fiberglass terhadap tingkat kekuatan tekan dan kekuatan tarik belah beton, serat dampaknyaa terhadap kedua sifat tersebut. Kandungan serat fiberglas yang diterapkan mencakup 4 variasi diantaranya 0%, 0,25%, 0,5% dan 0,75% dari total berat agregat. Selain penambahan serat, terdapat juga zat tambahan yang berperan dalam mengurangi ijumlah air campuran yang diperlukan untuk menghasilkan beton dengan konsistensi tertentu dan sekaligus meningkatkan tingkat kekuatan tekan beton. Zat tambahan tersebut adalah superplasticizer, yang merupakan produk Ertapast 35¸dan diaplikasikan dengan perbandingan 0,8% dari total berat semen.. Dalam Pengujian, benda uji yang digunakan adalah silinder berukuran 15 x 30 cm. sebanyak tiga silinder digunakan untuk menguji kekuatan tekan, dan tiga benda uji lainnya digunakan untuk menguji kekuatan tarik belah, semuanya pada umur 28 hari. Proses perencanaan campuran beton mengacu pada standar SNI 756-2012. Hasil penelitian menunjukan bahwa penambahan serat fiberglass yang cukup tinggi pada beton segar dapat mengakibatkan penurunan dalam hal kemampuan pengolahan. Namun, sifat beton setelah mengeras menunjukan bahwa baik kekuatan tekan maupun kekuatan tarik belah mengalami peningkatan seiring dengan peningkatan variasi penambahan serat fiberglass.
Analysis of the Relationship of Concrete Column Structural Elements to Steel Frame Beams Supporting Swimming Pool Loads in the East Coast Center II Phase 2 Surabaya Project Sumaidi; Wahyu Kartini; Rida Pribady
Nusantara Science and Technology Proceedings 5th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2024.4508

Abstract

The swimming pool is located on the top floor of the building with a large swimming pool making structural design pay attention to all aspects, especially safety aspects when used. The structural method used in this study is a combination of structures between concrete columns and Bailey model steel frame beams. The use of steel frame beams is because the swimming pool has an area of 27 m x 20,5 m and under the swimming pool there should be no columns to create a spacious room. In the combination of these structures, the relationship between concrete columns and steel frame beams (JCB) is connected using anchors as a component that transfers loads. The anchor used is an L-shaped anchor model. The anchor is connected at four end points of the steel frame beam which helps transfer the load to the concrete column. From the results of the analysis with ETABS software, the largest value of the axial force (Fz) is 5525113,22 N and the shear force (Fx) is 6438725 N. According to SNI 2847: 2019, the anchor needed to reduce the axial force and shear force is used 52 36 mm diameter anchors with a shear capacity value of 6496089,6 N and an axial capacity value of 12492480 N.
Analisis Ketidakberaturan Horizontal Struktur Rangka Gedung Oval Dengan Pushover Analysis Pada Rumah Sakit UPT Vertikal Surabaya Safriana Wahdi, Yudha; Kartini, Wahyu; Dwi Puspitasari, Nia
Jurnal Manajemen Teknologi & Teknik Sipil Vol. 7 No. 2 (2024): DECEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/jurmateks.v7i2.6194

Abstract

Building A at the Surabaya UPT Vertical Hospital is an example of using limited land to meet space needs. However, the oval shaped geometry of the building causes the frame structure to be different from usual. This changes in geometry has an impact on the occurences lateral and mass irregularities in the building structure. This study aims to analyze the stability and performance of oval structures by considering the influence of earthquake loads. The capacity level of structure is evaluated using the Performance Based Design method. This method involves conducting a Pushover Analysis by applying a predefined lateral dynamic load to the structure and gradually  increasing it until the structure reaches its maximum capacity, ultimately leading to the structural failure. The results of this research obtained a ductility value of 1.21 for the X axis and 1.46 for the Y axis, this value makes the structure classified as partially ductile and not fully ductile. The performance level of the structure on the longitudinal axis (X) is 0.002 and on the transverse axis (Y) is 0.0019, so the structure is classified as SP-1 Immediate Occupancy, which means that the damage caused is not dangerous even if an earthquake occurs. The results of this research can be used as a guide in planning and evaluating oval or other irregular building structures, especially for vital buildings in areas with high earthquake risk.
ANALISIS STRUKTUR BALOK RANGKA TERSUSUN BAJA H-BEAM TERHADAP BEBAN KOLAM RENANG PADA PROYEK EAST COAST CENTER II PHASE 2 PAKUWON CITY SURABAYA Rida Pribady; Sumaidi Sumaidi; Wahyu Kartini
Racic : Rab Construction Research Vol. 10 No. 1 (2025): JUNI 2025
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v10i1.5240

Abstract

The existence of a swimming pool above the building plus the size of the swimming pool makes the designed structure must be safe for its users. One of the structural methods used is a combination of structures where the use of a steel frame beam structure is connected to a concrete column. The steel frame beam structure uses two H-beam steel profiles arranged in a Bailey frame model. The frame beam uses a HWF 350.350.12.19 arranged profile with stiffening using a 20 mm thick coupling plate. In this structure, all connections use the welding connection method. The use of a steel frame beam structure is expected to be able to support the load of a swimming pool that stretches 27 m x 20.5 m. To determine the behavior and response of the steel frame beam structure to the load, a stability analysis of the steel frame beam structure was carried out using an auxiliary program. From the results of the analysis of the compressive and tensile control of the axial force of the frame beam, it is able to support the swimming pool load with the largest compressive control value of bar B11 11994701.59 N > 8375985.50 N and the largest tensile control of bar B19 16317000 N > 10384957.50 N.
COMPARISON OF PERIOD VALUE, DISPLACEMENT, AND DEVIATION BETWEEN LEVELS IN EKA CANDRARINI HOSPITAL BUILDING USING FIXED BASE SYSTEM AND BASE ISOLATION SYSTEM (HDRB) Nanda Primarta Nadila; Wahyu Kartini; Sumaidi
Racic : Rab Construction Research Vol. 10 No. 2 (2025): DESEMBER
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v10i2.5460

Abstract

One of the innovations that continues to be developed in the planning of earthquake-resistant building structures is the use of base isolation systems. Base isolation has various types, one of which is high damping rubber bearing (HDRB). HDRB is one type of base isolation that has a relatively large initial stiffness value, so can reduce a high enough earthquake force. To find out the comparison of period, displacement, and deviation values between levels using a fixed base system and an HDRB type base isolation system in the Eka Candrarini Hospital building, it is necessary to calculate the structural analysis using an auxiliary program. Based on the analysis, it was found that there was an increase in the period value of the structure by 67%, the displacement value in the X direction by 73% and the Y direction by 22%, and a decrease in the deviation value between levels by 42% in the X direction and 43% in the Y direction.
ANALISIS GAYA DIAFRAGMA, KORD, DAN KOLEKTOR PADA STRUKTUR GEDUNG OVAL RSUD AR ROZY KOTA PROBOLINGGO Adam Rachmat Edijana; Made Dharma Astawa; Wahyu Kartini
Racic : Rab Construction Research Vol. 10 No. 2 (2025): DESEMBER
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v10i2.5467

Abstract

The oval building structure of Ar-Rozy Regional Hospital in Probolinggo has non-parallel system horizontal irregularities due to the configuration of lateral restraint elements in the structure not parallel to its orthogonal axis. Structural failure due to irregularities can be anticipated by planning diaphragm elements. In this article, the design and calculation of diaphragm force, chord, and collector to ensure the safety of the structure in resisting lateral forces. The results in this article show that the diaphragm force design for stories 1-14 uses the minimum force (Fpx min), while for stories 15-16, it uses the diaphragm design force (Fpx). The chord element in the weak axis direction requires 6D22 reinforcement, while in the strong axis direction, it requires 3D22 reinforcement. The collector element in beam B1-A that has been designed requires additional 2D22 reinforcement and is installed in the center of the beam cross-section because beam B1-A as a collector element must have the ability to withstand axial-flexural forces due to the combination of collector design forces.
Structural Design Analysis of an Apartment Using a Flat Slab System with Prestressed Slabs RIVI FATHURRACHMAN AZIS; Wahyu Kartini; Sumaidi
Racic : Rab Construction Research Vol. 10 No. 2 (2025): DESEMBER
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v10i2.5468

Abstract

Pakuwon Residence Apartment is one of the high-rise buildings supporting vertical housing infrastructure in Bekasi City, West Java. The building employs a conventional structural system (slab, beam, and column). By using a flatslab system, the height of high-rise buildings is reduced because the ceiling height of each floor can be maximized. The disadvantage of the flatslab system is significant horizontal displacement; therefore, reinforcement with drop panels is necessary. Analysis was performed using the pushover method through dynamic analysis with the assistance of computer software. From the pushover analysis, the following results were obtained:Maximum displacement in the X direction is 41.085 mm (< 56 mm), Maximum displacement in the Y direction is 56.2925 mm (< 80 mm), Torsional irregularity is 1.155 (< 1.2), P-Delta effect is 0.0163 (< 0.1), Shear force is 21.21 MPa (≥ 2.92 MPa), Structural performance level is 0.0015 m and 0.0021 m (< 0.01), indicating the building is still classified as immediate occupancy (IO), Ductility is 2.94 (in the X direction) and 1.99 (in the Y direction), and classifying it as partial ductility.
The ANALISIS KINERJA STRUKTUR GEDUNG KULIAH TERPADU PPNS MENGGUNAKAN METODE SISTEM GANDA: Indonesia Mochamad Ilham Zulfar; Sumaidi; Wahyu Kartini
Racic : Rab Construction Research Vol. 10 No. 2 (2025): DESEMBER
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v10i2.6449

Abstract

The Integrated Lecture Building of the State Polytechnic of Shipbuilding Surabaya is constructed vertically or in multiple stories. However, multi-story buildings are vulnerable to lateral loads such as earthquakes and strong winds, especially since Surabaya has the potential for seismic activity. Therefore, the building must be designed to possess optimal structural resistance to lateral loads, such as earthquakes. In this study, the building is designed using a dual system, which is a combination of moment-resisting frames and shear walls to enhance the even distribution of lateral loads. The performance evaluation method used in the building design is a nonlinear static method, namely pushover analysis, based on ATC-40 guidelines. Based on the analysis results, the structural performance level falls under the Immediate Occupancy (IO) classification and exhibits full ductility.
The Effect of Concrete Compressive Strength Using Suralaya Power Plant Fly Ash and Alkali Activator Gita Amanda Yulianti; Wahyu Kartini; Nia Dwi Puspitasari
Racic : Rab Construction Research Vol. 11 No. 1 (2026): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v11i1.6650

Abstract

The Suralaya Power Plant produces approximately 700,000 tons of fly ash and bottom ash annually. To manage this waste, fly ash can be incorporated into concrete mixtures. Fly ash contains silica and alumina, which can react with calcium hydroxide (Ca(OH)₂), a byproduct of cement hydration. When activated with an alkaline solution of NaOH and Na₂SiO₃, fly ash can exhibit binding properties. In this study, specimens were prepared using Class F fly ash sourced from the Suralaya Power Plant in proportions of 0%, 100%, 90%, and 80%, activated with an alkaline solution at a ratio of 1:2.5 (10 M NaOH:Na₂SiO₃), and tested at 28 days with water cement ratios (w/c) of 0.45 and 0.55. Class F fly ash was chosen due to its slower setting time compared to Class C. The objective was to evaluate the compressive strength of concrete with varying fly ash percentages and alkaline activators. Results show that fly ash concrete with an alkaline activator (1:2.5) had high slump but low workability due to high viscosity. For w/c 0.45, 100% fly ash increased compressive strength by 58.72% compared to 100% cement concrete. For w/c 0.55, 100% fly ash achieved the highest increase, at 141.03% over 100% cement concrete.
PENGARUH VARIASI FAKTOR AIR SEMEN TERHADAP KUAT TEKAN DAN MORFOLOGI BETON GEOPOLIMER FLY ASH TIPE F Eliza Siti Syarifah; Wahyu Kartini; Sumaidi
Racic : Rab Construction Research Vol. 11 No. 1 (2026): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v11i1.6696

Abstract

Geopolymer concrete is one of the alternative substitutes for conventional concrete by utilizing fly ash as a cement substitute. This study examines the effect of varying water-to-cement ratios of 0.3, 0.4, and 0.5 on the morphology and compressive strength of type F fly ash-based geopolymer concrete. The activators used were 10 M NaOH and Na₂SiO₃ with a ratio of 1:1 through the dry mixing method. Morphological testing was conducted using SEM-EDX, and compressive strength was tested using a UTM at 28 days. The results showed that conventional concrete with W/C 0.3 had a dense morphology with low porosity, producing a compressive strength of 32.38 MPa. W/C 0.4 showed a rounded morphology with moderate porosity and a compressive strength of 31.82 MPa. Meanwhile, W/C 0.5 exhibited a rough morphology with high porosity and a compressive strength of 19.48 MPa. In contrast, all variations of geopolymer concrete showed loose morphology, high porosity, and low compressive strength 2.36 MPa W/C 0.3, 1.32 MPa W/C 0.4, and 1.32 MPa W/C 0.5. On average, the compressive strength of geopolymer concrete decreased by 93.93% compared to conventional concrete. The poor performance was due to the incomplete formation of N–A–S–H gel, as water could not dissolve Na₂SiO₃ in the dry mixing method, preventing optimal bonding between fly ash particles. Therefore, type F fly ash geopolymer concrete using the dry mixing method cannot be considered a substitute for Portland cement conventional concrete.
Co-Authors Achmad Dzulfiqar Alfiansyah Achmad Fadli Erlangga Adam Rachmat Edijana Afif Kusuma Wardana Anna Rumintang Astawa, Made Dharma Astawa, Made Dharma Eliza Siti Syarifah Gita Amanda Yulianti Hendra Setiawan Hilmi, Muhammad Agus Larasati, Andra Putri Made Dharma Astawa Mahendrayu, Betania Mochamad Ilham Zulfar Nanda Primarta Nadila Nia Dwi Puspitasari Nia Dwi Puspitasari Putri Shinta Permatasari Ramayati, Novita Dwi Rida Pribady Rida Pribady RIVI FATHURRACHMAN AZIS Safriana Wahdi, Yudha Sumaidi Sumaidi Sumaidi Sumaidi Sumaidi Sumaidi Sumaidi Sumaidi, Sumaidi Thesalonika Octaviana Wahyudi