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EVALUASI KINERJA DENGAN METODE PUSHOVER PADA STRUKTUR KOMPOSIT 10 LANTAI DENGAN VARIASI BRACING Liucius, Yenny Untari; Winata, Rangga; Leman, Sunarjo; Sandjaya, Arif
JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 4, November 2025
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v8i4.34228

Abstract

Indonesia, located in a seismically active region, faces significant challenges in earthquake-resistant structural design. One widely used method to evaluate structural performance under seismic loads is nonlinear pushover analysis. In this study, pushover analysis was employed to assess performance levels and determine ductility parameters of a 10-story composite structure with various bracing configurations. Three structural models were analyzed with different types of bracing added in the Y direction. Model 1 is a composite structure with SRC columns and steel beams; Model 2 uses inverted V bracing; and Model 3 incorporates multi story X bracing. Structural performance was evaluated using two approaches: the Capacity Spectrum Method (CSM) and the Displacement Coefficient Method (DCM). Furthermore, for buildings with composite columns, steel beams, and steel bracing, the response modification factor (R), overstrength factor (Ω₀), and displacement amplification factor (Cd) are not yet specified in SNI 1726-2019. The structural models were developed in three dimensions using MIDAS GEN software. The results show that Model 1 achieves IO–LS performance levels in both X and Y directions, while Models 2 and 3 exceed CP in the Y direction. The R values of all models are relatively similar. However, Models 2 and 3 show lower Ω₀ values compared to Model 1 in the Y direction. Cd of Model 2 is lower than Model 1, while Cd of Model 3 is higher. Based on the findings, Model 1 is recommended as the most optimal structural option among the three models. Abstrak Indonesia, yang terletak di kawasan seismik aktif menghadapi tantangan besar dalam perencanaan struktur tahan gempa. Salah satu metode yang banyak digunakan untuk mengevaluasi kinerja struktur terhadap beban gempa adalah analisis non-linier pushover. Dalam penelitian ini, analisis pushover digunakan untuk menilai tingkat kinerja dan mencari nilai parameter daktilitas struktur komposit dengan tambahan variasi bracing pada struktur gedung 10 lantai. Tiga model struktur dianalisis dengan pendekatan penambahan bracing pada struktur arah Y dengan tipe yang berbeda. Model 1 berupa struktur komposit dengan kolom SRC dan balok baja, model 2 berupa struktur komposit bracing inverted V, dan model 3 berupa struktur komposit dengan bracing multistory X. Evaluasi kinerja struktur dilakukan dengan analisis pushover menggunakan dua pendekatan, yaitu Capacity Spectrum Method (CSM) dan Displacement Coefficient Method (DCM). Selain itu, untuk bangunan dengan struktur kolom komposit dan balok baja dengan bracing baja, nilai faktor modifikasi respons (R), faktor kuat lebih (Ω₀), dan faktor pembesaran defleksi (Cd) belum diatur dalam SNI 1726-2019. Pemodelan struktur dilakukan secara tiga dimensi menggunakan software MIDAS GEN. Hasil evaluasi menunjukkan bahwa Model 1 memiliki level kinerja IO–LS pada arah X dan Y, sedangkan Model 2 dan 3 menunjukkan kinerja IO-LS pada arah X dan melebihi CP pada arah Y. Nilai faktor modifikasi respons (R) pada ketiga model relatif serupa. Selain itu, nilai overstrength factor (Ω₀) pada Model 2 dan 3 lebih rendah dibandingkan Model 1 pada struktur arah Y, sedangkan nilai displacement amplification factor (Cd) arah Y struktur pada Model 2 lebih rendah dari Model 1, sementara pada Model 3, nilai Cd justru lebih tinggi dibandingkan Model 1. Berdasarkan penelitian yang dilakukan, model 1 disarankan sebagai opsi struktur terbaik diantara ketiga model yang ada.
Evaluasi Kinerja SRPMM pada Gedung Baja 5 Lantai dengan Analisis Pushover menggunakan Variasi Pemodelan Deformation-Controlled dan Force-Controlled Prabowo, Andy; Winata, Rangga; Wijaya, Usman
Jurnal Teknik Sipil Vol 22 No 1 (2026): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v22i1.11470

Abstract

This study utilizes pushover analysis to evaluate the performance of Intermediate Moment Resisting Frame System (IMRFS) used as the lateral force resisting system on the five stories building. Two structural models were analysed with differences on plastic hinge allocations and the controlling behaviour. On Model 1, plastic hinges were assigned to the designated beam and columns with deformation-controlled behaviour, while on Model 2, the plastic hinges on the columns were changed to force-controlled. Building modelling was in 3-dimension using ETABS v.20.0.0. Evaluations of the structural performance used two methods. Based on the structural performance evaluation using the Capacity Spectrum Method (CSM) and the Displacement Coefficient Method (DCM), the performance level of Model 1 is IO–LS in the X direction and > CP in the Y direction. Meanwhile, the performance level achieved by Model 2 is > CP in both the X and Y directions. In addition to the performance level evaluation, verification was also conducted on the values of the response modification factor (R), overstrength factor (Ω₀), and deflection amplification factor (Cd) obtained from the pushover analysis. The R values for both models are approximately 3, which is lower than the R value specified for SRPMM in SNI 1726:2019. The Ω₀ values for Models 1 and Model 2 are approximately 1.5 and 2.4, respectively. The Cd values for Models 1 and Model 2 range from 4.3 to 4.8 and from 5.5 to 5.8, respectively, for both the X and Y directions.