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ALTERNATIF UJI BEBAN PADA STRUKTUR (STUDI KASUS : JEMBATAN BAJA) Soleh, Chairul; Rastandi, Josia Irwan
Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Vol 5, No 1 (2021): Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmstkik.v5i1.7215

The most common structural load test that has been widely used is the static load test. An alternative to the structural load test is dynamic load test. Dynamic testing is a test carried out to determine level of structural stiffness or structural elements stiffness in the form of natural frequencies, while the static load test is intended to obtain responses of static loading from the structure in the form of deflection. The discussion will emphasize the correlation between static load test and dynamic load test. To correlate the static load test with the vibration test, a reference or value that comes from modeling or theoretical analysis is needed. Structural modeling is carried out to obtain the theoretical natural frequency and the theoretical deflection which will then be compared with the natural frequency of the vibration test (dynamic). If the frequency of the test results and the theoretical frequency are compared to the theoretical deflection, the prediction of the test deflection will be obtained. The correlation between the predicted deflection of the test and deflection of the static load test is quite close with a difference of less than 12%. Judging from the above correlation, periodic inspections of the tested structures can be considered for vibration testing only. The types of structures reviewed are simple span steel bridge structure, simple span + link slab steel bridge structure and continuous span steel bridge structure. Keywords: modeling; natural frequencies; vibration testing; static load test AbstrakUji beban struktur yang umum dan sudah banyak dilakukan adalah uji beban statik. Alternatif lain dari uji beban adalah dengan melakukan pengujian vibrasi (dinamik) pada struktur. Pengujian vibrasi (dinamik) dilakukan untuk mengetahui tingkat kekakuan struktur atau elemen struktur berupa frekuensi alami, sedangkan uji beban statik dimaksudkan untuk mendapatkan respons hasil pembebanan statik dari struktur berupa lendutan. Pembahasan akan menekankan kepada korelasi antara uji beban statik dan uji beban vibrasi (dinamik). Untuk mengkorelasikan pengujian beban statik terhadap pengujian vibrasi (dinamik) diperlukan suatu acuan atau nilai yang berasal dari analisa pemodelan atau teoritis. Pemodelan struktur dilakukan untuk mendapatkan frekuensi alami secara teoritis dan lendutan teoritis yang kemudian akan dibandingkan dengan frekuensi alami hasil uji vibrasi (dinamik). Jika frekuensi hasil uji dan frekuensi teoritis dibandingkan terhadap lendutan teoritis maka akan didapatkan prediksi lendutan uji. Hasil korelasi antara prediksi lendutan uji terhadap lendutan uji beban statik cukup mendekati dengan perbedaan kurang dari 12%. Dilihat dari korelasi diatas, maka untuk pemeriksaan berkala pada struktur yang telah diuji dapat dipertimbangkan untuk dilakukan pengujian vibrasi saja. Jenis struktur yang ditinjau adalah struktur jembatan baja simple span, simple span + link slab dan continuous span.

Experimental Study of Hollow-core Slab Containing Waste PET Bottles Orientilize, Mulia; Rastandi, Josia Irwan; Aries C., R. M. Dimas; P., Marsha Niken; S.S., Krisna Adi; Abimantrana, Abimantrana
Makara Journal of Technology Vol. 25, No. 1
Publisher : UI Scholars Hub

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

This study investigated the utilization of plastic-waste concrete as an effort to reduce urban waste problems. The waste plastic bottles were utilized to form the hollows of the hollow-core slabs (HCSs). The bottles were made of polyethylene terephthalate (PET). As a part of green research to reuse waste material, shredded PET was also added to the concrete mixture to improve the HCS strength. The cast-in-site HCS could be constructed without any difficulties. Three parameters were investigated: the effects of void content, shredded PET content, and steel-fiber (SF) content on the HCS ultimate bending capacity (Mu). Fifteen specimens were tested under static loads until failure, and the results were compared with those of the solid slab. Two different void contents 19% and 24% were studied. The other parameters were the shredded PET content (0.5% and 0.7%) and the SF content (0.19% and 0.32%). The Mu values of the HCS specimens were 12% to 16% less than that of the solid slab. However, the strengths were still within the theoretical capacity of the slab. The addition of the shredded PET could improve the HCS bending capacity by 18% to 38% compared with that of the solid slab. Similar results were also found for the specimens with SFs, whose Mu values were 11% to 46% greater than that of the solid slab.

Pengaruh Perubahan Temperatur Terhadap Struktur Jembatan Baja Nakhrowi, Imam; Rastandi, Josia Irwan; Delitriana, Arvilla
Teras Jurnal : Jurnal Teknik Sipil Vol. 14 No. 2 (2024): Volume 14 Nomor 2, September 2024
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v14i2.1099

Abstrak Kemajuan dalam teknologi rekayasa struktur telah membawa inovasi signifikan dalam pembangunan infrastruktur, termasuk pengembangan jembatan segmental baja. Studi ini bertujuan untuk menyelidiki dampak perubahan temperatur dan jenis perletakan terhadap perilaku struktur jembatan segmental baja, dengan fokus pada tiga kondisi perletakan yang berbeda: sendi-rol (SSC), sendi-sendi (FEC), dan penggunaan Lead Rubber Bearing (LRB). Pemodelan dilakukan menggunakan metode elemen hingga dalam perangkat lunak MidasCivil. Analisis finite element diarahkan untuk memahami deformasi dan distribusi tegangan dalam struktur jembatan di bawah beban mati dan variasi temperatur. Hasil studi menunjukkan bahwa perubahan temperatur menyebabkan deformasi yang signifikan pada struktur jembatan, dengan pola perilaku yang berbeda tergantung pada jenis perletakan. Perletakan Sendi-Rol dan penggunaan LRB cenderung menunjukkan respons deformasi yang serupa, sementara perletakan Sendi-Sendi menunjukkan perilaku yang berbeda. Selain itu, distribusi tegangan juga bervariasi tergantung pada kondisi perletakan, dengan Sendi-Sendi menghasilkan tegangan yang lebih tinggi pada beberapa titik tertentu. Kata kunci: Temperatur, Perletakan, Jembatan Segmental Baja, Finite Element, Abstract Advancements in structural engineering have led to significant innovations in infrastructure development, notably segmental steel bridges. This study investigates the effects of temperature changes and different bearing conditions: simply supported condition (SSC), fixed end condition (FEC), and the implementation of Lead Rubber Bearing (LRB) on segmental steel bridge behavior. Utilizing finite element analysis use MidasCivil, the research examines deformation and stress distribution under dead loads and varying temperatures. Findings indicate temperature fluctuations induce significant deformations, with distinct responses based on bearing conditions. SSC and LRB show similar deformation patterns, while FEC behaves differently. Stress distribution varies accordingly, with FEC resulting in higher stresses at certain points. These insights enhance understanding of temperature and bearing effects on segmental steel bridges, informing maintenance strategies for durability. Validating computational models with field observations is recommended to ensure accurate simulations. Keywords: Temperature, Boundary Condition, Segmental Steel Bridge, Finite Element

Seismic Performance Evaluation of an Existing Laboratory Building with Concrete Strength Degradation Using Tier 3 Response Spectrum Analysis Based on ASCE 41-17 Aditya Rihadatul Aisy; Josia Irwan Rastandi; Jessica Sjah
Jurnal Sipakatau: Inovasi Pengabdian Masyarakat Vol. 3 No. 4 (2026): Juni
Publisher : PT. Global Research Collaboration

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66314/sipakatau.v3i4.901

Indonesia is located in a region with high seismic activity. The high frequency of earthquakes in Indonesia poses significant challenges for designing earthquake-resistant building structures. This condition worsens when buildings experience significant degradation in concrete strength, thereby reducing structural ductility. This study aims to evaluate the seismic performance of existing buildings designed under old regulations (SNI 1726:2002 and SNI 2847:2002) and exhibiting significant concrete strength degradation. The method used in this evaluation is based on ASCE 41-17 using a Tier 3 linear procedure with response spectrum analysis. The building evaluated is a 6-story laboratory building located at the University of Indonesia. This modeling was carried out using several concrete degradation scenarios (30, 25, 20, and 15 MPa). The parameters evaluated are structural drift and DCR using the BSE 2E earthquake level. Based on the global performance, there is an increase in structural drift in the x and y directions, so that the Life Safety (LS) performance limit of 2% is not met. Then, the DCR value increased for deformation-controlled and force-controlled actions, resulting in a higher percentage of beam and column components failing to meet the Life Safety (LS) performance target. For beam components, critical conditions for flexural and shear performance are found on the lower floors. For column components, critical conditions for flexural and axial performance are found on the lower floors. Meanwhile, critical conditions for shear performance are found on the middle floors. Therefore, critical elements requiring special attention can be properly identified, thereby facilitating the planning of structural strengthening.

Nonlinear Time-History Evaluation of Interstory Lead Rubber Bearing (LRB) Isolation in Reinforced Concrete Buildings Angela Ayu Putri; Josia Irwan Rastandi; Jessica Sjah
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.9654

Seismic isolation is widely recognized as an effective strategy for mitigating earthquake-induced structural response. However, most studies have focused on base-isolated systems, whereas interstory isolation remains less explored. In particular, research on interstory LRB isolation for multistory reinforced concrete buildings in Indonesia remains limited. This study investigates a 13-story reinforced concrete dual-system building equipped with interstory Lead Rubber Bearing (LRB) isolators between the first and second floors. Two configurations are considered: fixed-base and interstory-isolated models. Seismic performance is evaluated through nonlinear time-history analysis using eleven ground-motion record pairs selected to represent Indonesian seismic hazard conditions, with nonlinear behavior considered for the isolators and critical ground-story elements. This study contributes to the limited research on interstory LRB isolation by clarifying how seismic demands are redistributed in a dual RC building under Indonesian hazard-consistent ground motions. Results show that interstory LRB isolation elongates the fundamental period from 0.91–1.51 s to 2.64–2.94 s, reduces base shear by 32–37%, decreases overturning moment by 71–78%, and lowers maximum interstory drift ratio from 1.87% to 0.52% in X and from 2.48% to 0.87% in Y. These results demonstrate that interstory LRB isolation is a promising alternative when conventional base isolation is impractical.

Seismic Performance Evaluation of Laboratory Building with Concrete Column Jacketing Based on ASCE 41-17 using Pushover Analysis Aditya Rihadatul Aisy; Josia Irwan Rastandi; Jessica Sjah
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.9704

This study presents comprehensive seismic performance evaluation on the laboratory building structure designed using the old regulations (SNI 1726:2002 and SNI 2847:2002) and has been strengthened with concrete column jacketing through a pushover analysis procedure based on ASCE 41-17 guidelines. Based on the global performance of the structure, the structure drift have met the performance targets with a maximum drift of 1.92% for the X direction and 1.96% for the Y direction. Based on the analysis of the deformation-controlled action, the rotation values that occur in the beam components have met the performance targets with a maximum rotation of 0.0066 for negative moments and 0.0073 for positive moments. While the strain that occurs in the column components have also met the performance targets with a maximum strain of 0.0032 for rebar compression strain, 0.0131 for rebar tensile strain, and 0.0024 for concrete compression strain. Then, based on the analysis of the force-controlled action, the DCR values for shear and axial in the column components have met the performance targets with a maximum value for shear of 0.89 and for axial of 0.61. While the DCR values for shear in the beam components partially exceed the performance targets with a maximum value of 1.29.

Pengaruh Perubahan Temperatur Terhadap Struktur Jembatan Baja Imam Nakhrowi; Josia Irwan Rastandi; Arvilla Delitriana
Teras Jurnal : Jurnal Teknik Sipil Vol. 14 No. 2 (2024): Volume 14 Nomor 2, September 2024
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v14i2.1099

Abstrak Kemajuan dalam teknologi rekayasa struktur telah membawa inovasi signifikan dalam pembangunan infrastruktur, termasuk pengembangan jembatan segmental baja. Studi ini bertujuan untuk menyelidiki dampak perubahan temperatur dan jenis perletakan terhadap perilaku struktur jembatan segmental baja, dengan fokus pada tiga kondisi perletakan yang berbeda: sendi-rol (SSC), sendi-sendi (FEC), dan penggunaan Lead Rubber Bearing (LRB). Pemodelan dilakukan menggunakan metode elemen hingga dalam perangkat lunak MidasCivil. Analisis finite element diarahkan untuk memahami deformasi dan distribusi tegangan dalam struktur jembatan di bawah beban mati dan variasi temperatur. Hasil studi menunjukkan bahwa perubahan temperatur menyebabkan deformasi yang signifikan pada struktur jembatan, dengan pola perilaku yang berbeda tergantung pada jenis perletakan. Perletakan Sendi-Rol dan penggunaan LRB cenderung menunjukkan respons deformasi yang serupa, sementara perletakan Sendi-Sendi menunjukkan perilaku yang berbeda. Selain itu, distribusi tegangan juga bervariasi tergantung pada kondisi perletakan, dengan Sendi-Sendi menghasilkan tegangan yang lebih tinggi pada beberapa titik tertentu. Kata kunci: Temperatur, Perletakan, Jembatan Segmental Baja, Finite Element, Abstract Advancements in structural engineering have led to significant innovations in infrastructure development, notably segmental steel bridges. This study investigates the effects of temperature changes and different bearing conditions: simply supported condition (SSC), fixed end condition (FEC), and the implementation of Lead Rubber Bearing (LRB) on segmental steel bridge behavior. Utilizing finite element analysis use MidasCivil, the research examines deformation and stress distribution under dead loads and varying temperatures. Findings indicate temperature fluctuations induce significant deformations, with distinct responses based on bearing conditions. SSC and LRB show similar deformation patterns, while FEC behaves differently. Stress distribution varies accordingly, with FEC resulting in higher stresses at certain points. These insights enhance understanding of temperature and bearing effects on segmental steel bridges, informing maintenance strategies for durability. Validating computational models with field observations is recommended to ensure accurate simulations. Keywords: Temperature, Boundary Condition, Segmental Steel Bridge, Finite Element

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