Herawan, Daniel (2026) Analisis Perilaku Daktilitas Kolom Beton Bertulangan GFRP Di Bawah Beban Aksial Tekan dan Lateral Siklik. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kolom beton bertulang yang menerima kombinasi beban aksial tekan dan lateral siklik memerlukan sistem struktur tahan gempa yang andal. Untuk mengatasi korosi pada tulangan baja, Glass Fiber Reinforced Polymer (GFRP) digunakan sebagai alternatif tulangan, namun sifat linear-elastic hingga patah pada GFRP membuat mekanisme pengekangan beton berbeda secara fundamental dari tulangan baja, sehingga model konstitutif beton terkekang konvensional tidak dapat langsung diterapkan. Penelitian ini membandingkan tiga model konstitutif beton terkekang (Kusuma & Tavio, Isleem dkk., dan Kharal & Sheikh) dalam memprediksi respons struktural kolom GFRP berpenampang persegi, menggunakan pendekatan fiber section berbasis program macro VBA Excel untuk kurva tegangan-regangan dan momen-kurvatur, serta pemodelan Finite Element Method (FEM, ABAQUS/CDP) untuk validasi respons deformasi, terhadap empat spesimen kolom yang bervariasi pada rasio beban aksial (0,28Po dan 0,42Po) dan jenis tulangan longitudinal (baja dan GFRP).
Hasil menunjukkan tidak ada satu model yang konsisten unggul di seluruh spesimen. Pada level material, tegangan puncak antar-model tersebar 17,4–29,9%, regangan puncak jauh lebih lebar (35,5–102,8%). Pada level struktural, momen puncak menyimpang 0,76–1,55 kali dan kurvatur ultimate menyimpang lebih besar (rasio 0,16–1,69) terhadap eksperimen pada enam belas kombinasi model-skenario-spesimen, termasuk skema substitusi sengkang baja; seluruh kombinasi mengalami kegagalan compression-controlled, sejalan filosofi desain FRP-RC yang direkomendasikan ACI 440.1R. Peningkatan rasio beban aksial menurunkan daktilitas kurvatur secara konsisten pada spesimen baja dan mayoritas kombinasi spesimen GFRP. Jenis tulangan longitudinal tidak menunjukkan pola pergeseran daktilitas yang seragam terhadap material sengkang — variasi antar-model konfinemen GFRP terbukti lebih dominan. Model elemen hingga (FEM) menunjukkan akurasi tertinggi (selisih gaya geser 4,64% monotonik, 3,07% siklik), sedikit melampaui kombinasi VBA terbaik (2,1%). Temuan ini menegaskan pemilihan model konstitutif berpengaruh signifikan terhadap prediksi daktilitas kolom GFRP, menjadi pertimbangan penting bagi praktisi desain di daerah rawan gempa.
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Reinforced concrete columns subjected to combined axial compression and cyclic lateral loading require a reliable earthquake-resistant structural system. GFRP is increasingly used as a corrosion-resistant alternative to steel reinforcement, but its linear-elastic-to-rupture behavior fundamentally alters the concrete confinement mechanism, limiting the applicability of conventional confined-concrete constitutive models. This study evaluates three confined-concrete constitutive models (Kusuma & Tavio, Isleem et al., and Kharal & Sheikh) in predicting the structural response of square GFRP-reinforced columns, using a fiber-section approach (VBA Excel macro) for stress-strain and moment-curvature analysis, alongside FEM (ABAQUS/CDP) modeling for deformation validation, against four specimens varying in axial load ratio (0.28Po and 0.42Po) and longitudinal reinforcement type (steel and GFRP).
Results show that no single model consistently outperforms the others across all specimens. At the material level, peak stress scatter across models is 17.4–29.9%, peak strain scatter far wider (35.5–102.8%). At the structural level, peak moment deviates 0.76–1.55 times and ultimate curvature deviates more sharply (ratio 0.16–1.69) from experimental values across sixteen model-scenario-specimen combinations, including a steel-tie substitution scheme; all combinations exhibit compression-controlled failure, consistent with the FRP-RC design philosophy recommended by ACI 440.1R. Increasing the axial load ratio consistently reduces curvature ductility in steel-reinforced specimens and the majority of GFRP-reinforced combinations. Longitudinal reinforcement type shows no uniform ductility shift pattern attributable to tie material — variation among the GFRP confinement models proves more dominant. The finite element (FEM) model shows the highest accuracy (shear force differences of 4.64% monotonic, 3.07% cyclic), narrowly surpassing the best VBA combination (2.1%). These findings confirm that constitutive model selection significantly affects ductility predictions for GFRP columns, an important consideration for practitioners designing in seismic-prone regions.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Glass Fiber Reinforced Polymer (GFRP), Beton Terkekang, Momen–Kurvatur, Daktilitas Kolom, Beban Lateral Siklik, Confined Concrete, Moment–Curvature, Column Ductility, Cyclic Lateral Loading. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA444 Reinforced concrete T Technology > TA Engineering (General). Civil engineering (General) > TA660.C6 Columns T Technology > TH Building construction > TH1095 Earthquakes and building T Technology > TH Building construction > TH1461 Concrete construction. |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Civil Engineering > 22101-(S2) Master Theses |
| Depositing User: | Daniel Herawan |
| Date Deposited: | 28 Jul 2026 01:14 |
| Last Modified: | 28 Jul 2026 01:14 |
| URI: | http://repository.its.ac.id/id/eprint/137466 |
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