Analisis Efektivitas Expansion Joint Terhadap Tegangan Termal dan Keberlanjutan Kinerja Struktur Jembatan

Wibowo, Annisa Puspita Cahyani (2025) Analisis Efektivitas Expansion Joint Terhadap Tegangan Termal dan Keberlanjutan Kinerja Struktur Jembatan. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5012211065-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (15MB) | Request a copy

Abstract

Perubahan suhu pada jembatan bentang panjang dapat menimbulkan ekspansi dan kontraksi termal yang berpengaruh terhadap kinerja struktural secara signifikan. Apabila deformasi akibat perubahan suhu tersebut terhambat, dapat timbul tegangan tarik berlebih yang berpotensi menyebabkan retak pada elemen beton dan menurunkan umur layan struktur. Penelitian ini bertujuan untuk menganalisis efektivitas penggunaan expansion joint dalam mengurangi tegangan termal serta meningkatkan keberlanjutan kinerja jembatan pelat beton prategang menerus sepanjang 430 meter yang pada kondisi eksisting tidak dilengkapi sambungan ekspansi. Analisis dilakukan secara numerik menggunakan perangkat lunak Midas Civil dengan pendekatan elemen batang (beam element). Tiga kondisi pemodelan dibandingkan, yaitu struktur eksisting tanpa expansion joint, Modifikasi 1 dengan sambungan pada pilar P2 dan P3, serta Modifikasi 2 dengan sambungan pada seluruh pilar. Hasil analisis menunjukkan bahwa pada kondisi eksisting, struktur menahan seluruh deformasi akibat perubahan suhu dengan total pemuaian ±34 milimeter dan menghasilkan tegangan tarik maksimum sebesar 4,55 MPa, melebihi batas izin beton sebesar 3,16 MPa. Penambahan expansion joint pada seluruh pilar (Modifikasi 2) menurunkan tegangan hingga 2,80 MPa atau sekitar 40%, serta menghasilkan distribusi tegangan yang lebih merata di sepanjang pelat. Selain mereduksi tegangan, dilakukan pula optimasi melalui reduksi tulangan, dengan penurunan kebutuhan tulangan sebesar 19% pada spandrel, 9% pada box pelengkung, hingga 59% pada pilar. Dengan demikian, penerapan expansion joint terbukti efektif dalam mengakomodasi deformasi termal, menjaga stabilitas, dan memperpanjang umur layan struktur.
=========================================================================================================================================
Temperature variations in long-span bridges can induce significant thermal expansion and contraction, which substantially affect structural performance. If the deformations caused by temperature changes are restrained, excessive tensile stresses may develop, potentially causing cracking in concrete elements and reducing the service life of the structure. This study aims to evaluate the effectiveness of expansion joints in mitigating thermal stresses and enhancing the performance sustainability of a 430-meter continuous prestressed concrete slab bridge, which in its existing condition lacks expansion joints. Numerical analysis was conducted using Midas Civil software with a beam element approach. Three modeling scenarios were compared: the existing structure without expansion joints, Modification 1 with joints installed at piers P2 and P3, and Modification 2 with joints installed at all piers. The results indicate that in the existing condition, the structure accommodates the full thermal deformation, resulting in a total elongation of approximately ±34 millimeters and a maximum tensile stress of 4.55 MPa, exceeding the concrete allowable limit of 3.16 MPa. The implementation of expansion joints at all piers (Modification 2) reduced the maximum tensile stress to 2.80 MPa, a decrease of about 40%, while also producing a more uniform stress distribution along the slab. In addition to stress reduction, reinforcement requirements by 19% for spandrel, 9% for the arch box, and 59% for the pier element. Therefore, the implementation of expansion joints has proven to be effective in accommodating thermal deformations, maintaining structural stability, and extending the service life of the bridge.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Beton Prategang, Expansion Joint, Pelat Lantai, Tegangan, Temperatur, Prestressed Concrete, Expansion Joint, Deck Slab, Stress, Temperature
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking. T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Environmental Engineering > 25201-(S1) Undergraduate Thesis
Depositing User:	Annisa Puspita Cahyan
Date Deposited:	12 Jan 2026 06:44
Last Modified:	12 Jan 2026 06:44
URI:	http://repository.its.ac.id/id/eprint/129496

Actions (login required)

View Item