STUDY ANALYSIS OF ALTERNATIVE STRENGTHENING METHODS FOR LONG-SPAN REINFORCED CONCRETE CANTILEVER BEAMS

Ni Putu Silvi; I Putu Laintarawan; I Gusti Ngurah Eka Partama

doi:10.21009/jpensil.v15i2.66641

Authors

Ni Putu Silvi Program Studi Teknik Sipil, Fakultas Sains dan Teknologi, Universitas Ngurah Rai, Jalan Kampus Ngurah Rai No. 30 Penatih, Denpasar, Bali, 80238, Indonesia
I Putu Laintarawan Program Studi Teknik Sipil, Fakultas Teknik, Perencanaan dan Informatika, Universitas Hindu Indonesia, Jalan Sanggalangit, Penatih, Denpasar, Bali, 80238, Indonesia
I Gusti Ngurah Eka Partama Program Studi Teknik Sipil, Fakultas Sains dan Teknologi, Universitas Ngurah Rai, Jalan Kampus Ngurah Rai No. 30 Penatih, Denpasar, Bali, 80238, Indonesia

DOI:

https://doi.org/10.21009/jpensil.v15i2.66641

Keywords:

Cantilever Beam, Reinforced Concrete, Structural Strengthening, Deflection, ETABS

Abstract

Reinforced concrete cantilever beams with long spans are prone to excessive deflection, which may adversely affect structural performance and safety. This study aims to analyze alternative strengthening methods for reinforced concrete cantilever beams in a villa building where the cantilever length was extended up to 3.65 m during the construction stage, resulting in deflections exceeding the allowable limits. The research employed a quantitative approach using three-dimensional structural modeling with ETABS software. Existing structural conditions were identified through non-destructive testing, including hammer tests and rebar scanning, to determine the residual concrete strength and reinforcement configuration. The analyzed strengthening measures constitute an integrated strengthening package consisting of first-floor column jacketing, the addition of second-floor columns, and the enlargement of second-floor cantilever beam dimensions as a unified structural system. Structural performance was evaluated in terms of deflection, bending moment, shear force, and axial force before and after strengthening. The analysis results indicate that prior to strengthening, the cantilever beam deflections did not satisfy the allowable deflection criteria. After strengthening, the deflections were significantly reduced by 22.8% at the roof level and 56.8% at the second-floor level, meeting the allowable deflection requirements. In addition, the internal force distribution improved and the supporting capacity of the structural elements increased. Therefore, the proposed strengthening alternatives are proven to be effective in enhancing the structural behavior of long-span cantilevered reinforced concrete beams.

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