Perhitungan Penulangan Pile Cap Pondasi Tower Crane.docx

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Perhitungan Penulangan Pile Cap Pondasi Tower Crane Desain pile cap menggunakan beton bertulang dengan kualitas beton K-270 dan tulangan baja Ø25. = 350 kg/cm2

Fc’

= 3500 ton/m2 Fy

= 400 MPa = 40000 ton/m2

Ο’ fc’

a T

Cc

T Dalam perhitungan luas bagian yang mengalami tekan digunakan kedua rumus di bawah: 1) 𝐢𝑐 = 𝑇 π‘Ž π‘₯ 𝑏 π‘₯ Ο’ 𝑓𝑐 β€² = 𝐴𝑠 π‘₯ 𝑓𝑦 π‘Ž π‘₯ 5 π‘₯ 0,85 π‘₯ 3500 = 𝐴𝑠 π‘₯ 40000 π‘Ž = 2,689 𝐴𝑠 2) 𝑀𝑛 = 𝐢𝑐 ( 𝑑 βˆ’

1 π‘Ž) 2

678 = 𝐴𝑠 π‘₯ 40000 ( 1,25 βˆ’

678 = 𝐴𝑠 π‘₯ 40000 ( 1,25 βˆ’

1 π‘Ž) 2

1 π‘₯ 2,689 𝐴𝑠) 2

678 = 𝐴𝑠 π‘₯ 40000 ( 1,25 βˆ’

1 π‘₯ 2,689 𝐴𝑠) 2

678 = 𝐴𝑠 π‘₯ 40000 ( 1,25 βˆ’ 1,344 𝐴𝑠) 678 = βˆ’53780 𝐴𝑠² π‘₯ 50000 𝐴𝑠 53780 𝐴𝑠² βˆ’ 50000 𝐴𝑠 + 678 = 0 Dari persamaan di atas didapatkan luas tulangan tarik sebesar: 𝐴𝑠 1 = 0,916 π‘šΒ²

𝐴𝑠 2 = 0,014 π‘šΒ² Ambil nilai: ο‚·

As = 9200 cm2

Penentuan Jumlah Tulangan 𝑛=

𝐴𝑠′ 9200 = = 18,75 Μ΄ 19 π‘π‘’π‘Žβ„Ž 𝐴 Ø25 490,63

Jarak antar tulangan: 𝑆=

500 (19+1)

= 25 cm

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