VASHTI ALPHA RAISSA, AZARINE (2023) ANALISA PENGARUH GROUNDSILL PADA JEMBATAN TERHADAP KARAKTERISTIK ALIRAN (MODEL FISIK). S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.

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Abstract

Groundsill is one of the categories of wide thresholds that are generally built transversely in the river downstream of a building threatened with damage caused by scouring such as bridge pillars. In addition to construction factors, local scour around the pillars can be another factor causing the collapse of the bridge structure. The purpose of this study is to determine the flow characteristics between bridge pillars with groundsill safety and bridge pillars without groundsill safety and the influence of groundsill height. Physical model research was conducted at the Integrated Laboratory of Sultan Ageng Tirtayasa University, Sindangsari Campus. The groundsill model is modeled with dimensions of 8 x 5 x 30 cm made of wood and the bridge pillar model is modeled with a diameter of 1" made of PVC pipe which is filled with concrete. Wide threshold models (groundsill) are made with variations in the height of the groundsill (1, 2, 3, 4, and 5 cm). The results showed that; (1) in the condition of a pillar without groundsill the water level upstream (H1) is greater than the water level downstream (H2), while the flow speed upstream (V1) is smaller than the flow speed downstream (V2), as well as the Froude number upstream is smaller than the Froude number downstream. The Froude number downstream of the pillar in this condition includes the supercritical flow (Fr > 1) while the Froude number upstream of the pillar includes the subcritical flow (Fr < 1). After using groundsill, the water level in the upstream (H1) has increased while downstream (H2) has decreased, so that the flow speed upstream (V1) has slowed down and downstream (V2) has increased, so the number of Froude upstream will also decrease and downstream will increase. (2) The higher the groundsill (p), the higher the water level upstream (H1) is greater and downstream (H2) is smaller, while the flow speed upstream (V1) is smaller and downstream is greater, so the Froude number downstream is greater than upstream. The higher the groundsill (p), the Froude number downstream will increase while downstream will decrease (directly proportional to the flow speed upstream and downstream).

Item Type:	Thesis (S1)
Contributors:	Contribution Contributors NIP/NIM Thesis advisor SUBEKTI, SUBEKTI 197506122008011020 Thesis advisor ADHI PRIYAMBODHO, BAMBANG 197704042009121001
Additional Information:	Groundsill merupakan salah satu kategori ambang lebar yang umumnya dibangun secara melintang sungai di bagian hilir suatu bangunan terancam rusak yang disebabkan oleh gerusan seperti pada pilar jembatan. Selain faktor konstruksi maka gerusan lokal di sekitar pilar dapat menjadi faktor lain penyebab keruntuhan struktur jembatan. Tujuan penelitian ini adalah mengetahui karakteristik aliran antara pilar jembatan dengan pengaman groundsill dan pilar jembatan tanpa pengaman groundsill dan pengaruh dari tinggi groundsill. Penelitian model fisik dilakukan di Laboratorium Terpadu Universitas Sultan Ageng Tirtayasa Kampus Sindangsari. Model ambang lebar (groundsill) dimodel dengan dimensi 8 x 5 x 30 cm terbuat dari bahan kayu dan model pilar jembatan dimodel dengan diameter 1” terbuat dari pipa bahan PVC yang di dalamnya diisi dengan beton. Model ambang lebar (groundsill) dibuat dengan variasi ketinggian groundsill (1, 2, 3, 4, dan 5 cm). Hasil penelitian menunjukkan bahwa; (1) pada kondisi pilar tanpa groundsill tinggi muka air di hulu (H1) lebih besar dibandingkan tinggi muka air di hilir (H2), sedangkan kecepatan aliran di hulu (V1) lebih kecil dibandingkan kecepatan aliran di hilir (V2), demikian juga bilangan Froude di hulu lebih kecil dibandingkan bilangan Froude di hilir. Bilangan Froude di hilir pilar pada kondisi ini termasuk aliran superkritis (Fr > 1) sedangkan bilagan Froude di hulu pilar termasuk aliran subkritis (Fr < 1). Setelah menggunakan pengaman groundsill tinggi muka air di hulu (H1) mengalami kenaikan sedangkan di hilir (H2) mengalami penurunan, sehingga kecepatan aliran di hulu (V1) mengalami perlambatan dan di hilir (V2) mengalami peeningkatan, demikian bilangan Froude di hulu juga akan mengalami penurunan dan di hilir akan semakin meningkat. (2) Semakin tinggi groundsill (p) maka tinggi muka air di hulu (H1) semakin besar dan di hilir (H2) semakin kecil, sedangkan kecepatan aliran di hulu (V1) semakin kecil dan di hilir semakin besar demikian dengan bilangan Froude di hilir lebih besar dibandingkan di hulu. Semakin tinggi groundsill (p) maka bilangan Froude di hilir akan semakin meningkat sedangkan di hilir akan semakin menurun (berbanding lurus dengan kecepatan aliran di hulu dan hilir).
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	03-Fakultas Teknik 03-Fakultas Teknik > 22201-Jurusan Teknik Sipil
Depositing User:	Mrs Azarine Vashti Alpha Raissa
Date Deposited:	07 Sep 2023 09:19
Last Modified:	07 Sep 2023 09:19
URI:	http://eprints.untirta.ac.id/id/eprint/29343

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