MODIFIKASI SISTEM KABEL UTAMA UNTUK MENINGKATKAN KEKAKUAN STRUKTURAL JEMBATAN GANTUNG (MODIFICATION OF MAIN CABLE SYSTEM FOR INCREASING STRUCTURAL STIFFNESS OF SUSPENSION BRIDGES)

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Published: Jun 19, 2016

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Lanneke Tristanto
Gatot Sukmara

Abstract

ABSTRAK

 

Jembatan gantung terdiri dari elemen utama mendasar : kabel utama, gelagar pengaku, menara dan blok angkur Sistem kabel utama memikul beban terbagi merata simetris melalui bentuk parabolic klasik sehingga tidak terjadi defleksi, sedangkan fleksibilitas lentur akibat beban hidup antimetris dipikulkan pada gelagar pengaku. Makalah  ini menjelaskan cara modifikasi sistem kabel utama untuk mengurangi fleksibilitas lentur dan defleksi akibat beban hidup antimetris dan demikian meningkatkan kekakuan struktural . Cara pertama adalah sistem kelem kabel utama tunggal di tengah bentang yang mengikat kabel utama pada gelagar pengaku, yang me-reduksi defleksi maksimum sekitar 30 %  pada dimensi kabel utama dan gelagar pengaku yang dipertahankan sama. Sistem kelem kabel utama tunggal lajim digunakan pada jembatan gantung bentang sangat panjang. Cara kedua  adalah sistem kelem kabel utama ganda yang meningkatkan kekuatan kabel dan dengan demikian mereduksi fleksibilitas lentur dan defleksi sekitar 60%. Sistem kelem kabel ganda telah digunakan pada jembatan bentang panjang seperti Jembatan Barito-Kalimantan. Dengan menggunakan prinsip statika sederhana akan ditunjukkan bagaimana peningkatan kekakuan struktural terwujud pada penggunaan modifikasi sistem kabel utama tersebut, dengan syarat kelem bekerja sesuai fungsinya

 

Kata kunci : jembatan gantung, sistem kelem kabel utama tunggal, sistem kelem kabel utama ganda, defleksi, kekakuan struktural

 

ABSTRACT

 

A suspension bridge comprises of principal main elements : main cable, stiffening girder, tower and anchorage block. The main cable system carries symmetrical uniform distributed load through the classical parabolic shape resulting zero deflection, while the stiffening deck girder carries the bending flexibility caused by un-symmetrical live load. This writing describes the modification methods for the main cable system in order to reduce bending flexibility and deflection caused by anti symmetrical live load and thereby increasing structural stiffness. The first method is clamped single main cable system  at center span that ties the main cable to the stiffening girder, reducing maximum deflection around 30 % while enhancing main cable and stiffening girder dimensions. This clamped single main cable system is generally used in super long span suspension bridging. The second method is the clamped twin main cable system that increases cable strength and thereby reducing bending flexibility and deflection around 60%. The clamped twin cable system is used in long span suspension bridging, like the Barito bridge- Kalimantan. Using simple principals of statics it is shown how structural stiffness increase is obtained by using these modified main cable systems, providing the clamp is working according to its function.

 

Key words : suspension bridge, clamped main cable system, clamped twin cable system, deflection, structural stiffness

Article Details

Issue
Vol. 33 No. 1 (2016)
Section
Jalan dan Jembatan

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