Evaluasi kapasitas struktur dan perkuatan berbasis CFRP pada gedung pasca perubahan fungsi

Yustisia, Vicky Wildan ORCID: https://orcid.org/0009-0003-3445-7295, Syihabuddin, Thilal ORCID: https://orcid.org/0000-0001-9963-9370, Aini, Khusniatul and Irvania, Artya (2026) Evaluasi kapasitas struktur dan perkuatan berbasis CFRP pada gedung pasca perubahan fungsi. JURNAL TEKNIK SIPIL DAN TEKNOLOGI KONSTRUKSI, 1 (1). ISSN 2477-5258

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Abstract

Buildings undergoing functional transformation face structural demands exceeding original design capacity. This study evaluates the structural capacity of a two-story reinforced concrete office building at Taman Tekno BSD, Tangerang, following a rooftop-to-office floor conversion in 2024. Non-destructive testing—Schmidt Hammer Test (SHT) and Ultrasonic Pulse Velocity (UPV)—was conducted at 35 and 12 measurement points, respectively, yielding in-situ concrete compressive strengths ranging from fc' = 15.6 MPa (roof slab, poor condition) to fc' = 47.2 MPa (ground-floor columns). Three-dimensional structural modeling was performed using ETABS, applying dead and live loads per SNI 1727:2020 and seismic loads per SNI 1726:2019 (site class SD, Ss = 0.95g, S1 = 0.40g, SDS = 0.63g, SD1 = 0.36g, Risk Category II). Structural capacity checks followed SNI 2847:2019. Results reveal that the converted roof slab (third floor) exhibits a nominal flexural capacity (φMn = 10.2 kN·m) far below the governing ultimate moment demand (Mu = 35.1 kN·m), a demand-to-capacity (D/C) ratio of 3.43. Several beam-column joints fail the strong-column weak-beam criterion (ΣMc/ΣMb = 1.05 < 1.20 per SNI 2847:2019 Clause 18.7.3). Carbon Fiber Reinforced Polymer (CFRP) strengthening per SNI 8971:2021 and ACI 440.2R-17 is proposed: two-layer CFRP confinement wrapping on all columns, CFRP laminates with U-wraps on critical beams, and CFRP strips at 150 mm spacing on the third-floor slab soffit. Post-strengthening analysis shows slab flexural capacity increasing to φMn = 35.1 kN·m (+244%), column axial utilization decreasing from ~0.70 to ~0.55 (+20% capacity), and beam shear capacity improving by +27%. All critical elements analytically satisfy SNI code requirements after strengthening. The analytical CFRP retrofit approach is effective and minimally invasive, making it a viable solution for similar rooftop-conversion projects in Indonesia.

Item Type:	Journal Article
Keywords:	perkuatan CFRP; konversi rooftop; beton bertulang; uji non-destruktif; evaluasi kapasitas struktur
Subjects:	09 ENGINEERING > 0905 Civil Engineering > 090502 Construction Engineering 09 ENGINEERING > 0905 Civil Engineering > 090503 Construction Materials 09 ENGINEERING > 0905 Civil Engineering > 090506 Structural Engineering 09 ENGINEERING > 0905 Civil Engineering
Divisions:	Faculty of Technology > Department of Civil Engineering
Depositing User:	Vicky Wildan Yustisia
Date Deposited:	25 Jun 2026 16:15

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