Alfian, Ahmad Nur (2020) Alternatif Desain Tubuh Bendungan Urugan Waduk Tukul Pacitan Menjadi Bendungan Beton Bertulang. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Untuk pengendalian banjir, memenuhi kebutuhan air irigasi, penyediaan air baku, dan penyediaan energi listrik maka dipandang perlu untuk mengadakan pembangunan bendungan. Bendungan adalah bangunan yang berupa urugan tanah, batu, beton, dan atau pasangan batu yang dibangun untuk menahan dan menampung air. Dalam tahap pelaksanaan pembangunan bendungan beton, dapat dikurangi beberapa item yang ada dalam pekerjaan bendungan urugan. Karena volume pekerjaan turun maka waktu pelaksanaannya pun dapat dipercepat. Keadaan geologi dilokasi Waduk Tukul Pacitan merupakan batuan-batuan keras, merujuk hasil tes kecepatan rambat gelombang dengan Vs tanah rata-rata kedalaman 30 meter yaitu Vs = 1446 m/s (Vs = 750-1500) termasuk dalam kategori (SB). Dengan keadaan geologi yang memungkinkan maka bendungan beton diharapkan lebih murah dibanding dengan tipe urugan. Sehingga, direncanakan konstruksi bendungan menggunakan beton bertulang, Proses perencanaannya dimulai dengan melakukan pemilihan lokasi as bendungan dengan memperhatikan persyaratannya dan disesuaikan dengan topografi dilapangan, selanjutnya dilakukan preliminary desain meliputi ketebalan tubuh bendungan dan kedalaman pondasi setempat dengan memperhatikan beban hidrostatis dan beban sedimen, selanjutnya mendesain spillway beserta kolam olak sesuai persyaratan yang ada, selanjutnya yaitu Analisa pembebanan meliputi beban mati,beban hidup, beban hidrostatis, beban sedimen, beban tanah aktif, beban tanah pasif, beban gempa, berat air diatas spillway dan kolam olak, beban uplift, dan beban hidrodinamis sesuai bentuk bangunan dan peraturan masing-masing, selanjutnya dilakukan Analisa output dari program bantu dengan dilakukan pengecekan terhadap kapasitas sturkturnya meliputi cek stabilitas dan rembesan yang selanjutnya struktur dimodelkan menggunakan program bantu SAP2000 untuk mengetahui gaya yang terjadi disetiap elemen struktur, selanjutnya dilakukan perhitungan kebutuhan tulangan. Spillway direncanakan mengunakan spillway terpasang pada tubuh bendungan, dengan tipe spillway at crest yaitu spillway dengan limpasan langsung dipuncak bendungan dengan aliran yang dikendalikan dengan kemiringan 1:0,5 dan kolam olak dengan peredam energi USBR tipe II, dengan kebutuhan tulangan pada tubuh bendungan dan pondasi diamati dari gaya S22 (gaya arah y) dan S33 (gaya arah Z) untuk menentukan kebutuhan tulangan pada tubuh dan pondasi bangunan. Untuk mengetahui kebutuhan tulangan pada setiap bored pile diamati gaya P,M2,dan M3. Dengan kebutuhan tulangan bored pile 2,4 m yaitu 60D-32 atau 1,06%, bored pile 2,2 m yaitu 48D-32 atau 1,01%, bored pile 2,0 m yaitu 40D-32 atau 1,02%, bored pile 1,2 m yaitu 16D-32 atau 1,13%, dan bored pile 1,0 m yaitu 16D-32 atau 1,63%.
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To control floods, fulfilling irrigation water needs, providing raw water, and electricity, it is necessary to establish dam construction. Dams are buildings consisting of soil, rocks, concrete, and stone pairs that are built to hold and collect water . In the stage of construction of concrete dams, several items can be reduced in the work of the dam. Because the drop of work volume, the execution time can be accelerated. The geological situation at the Tukul Pacitan Reservoir is hard rocks, referring to the results of the wave propagation velocity test with an average soil Vs of 30 meters depth that is Vs = 1446 m / s (Vs = 750-1500) included in the category (SB). The geological condition is possible, concrete dams are expected to be cheaper than the earthfill dams. So, the dam construction is planned to use reinforced concrete. The planning process starts with selecting the location of the dam according to its requirements and adjusting it to the topography in the field. The preliminary design includes the thickness of the dam body and the depth of the local foundation by considering the hydrostatic load and sediment load. Then design the spillway and tailwater according to the regulations, then calculate the load analysis which includes dead load, live load, hydrostatic load, sediment load, active soil load, passive soil load, seismic load, water weight above spillway and tailwater, uplift load, and hydrodynamic load according to the shape of the building and the respective regulations, Furthermore, the output analysis of the auxiliary program is carried out by checking the capacity of the structure, including checks for stability and seepage, then the structure is modeled using the SAP2000 auxiliary program to determine the forces that occur in each structural element, then the reinforcement requirements are calculated. The spillway is planned to use a spillway installed on the dam body, with a spillway at crest type that is a spillway with direct runoff at the top of the dam with a slope controlled with a slope of 1: 0,5 and an olak pool with USBR type II energy absorbers, with reinforcement requirements at the dam body and observed foundation the S22 force (y direction force) and S33 (Z direction force) to determine the reinforcement needs of the body and the building foundation. To find out the reinforcement requirements in each bored pile, P, M2 and M3 are observed. With the need for 2,4 m bored pile, namely 60D-32 or 1,06%, 2,2 m bored pile, 48D-32 or 1,01%, 2,0 m bored pile, 40D-32 or 1,02%, 1,2 m bored pile, 16D-32 or 1,13% and bored pile 1,0 m, which is 16D-32 or 1,63%.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSIS 627.8 Alf a-1 |
| Uncontrolled Keywords: | Bendungan, Bendungan beton bertulang, Struktur Bendungan ======================================================== Dams, reinforced concrete dams, Dams structure |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22301-(D4) Diploma 4 |
| Depositing User: | Ahmad Nur Alfian |
| Date Deposited: | 21 Mar 2025 02:33 |
| Last Modified: | 21 Mar 2025 02:33 |
| URI: | http://repository.its.ac.id/id/eprint/73025 |
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