BAB V PONDASI DANGKAL
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Pendahuluan
Pondasi adalah sesuatu yang menyongkong suatu bangunan seperti kolom atau dinding yang membawa beban bangunan tersebut.
Pondasi Dangkal pondasi yang diletakan tepat dibawah bagian yang terbawah dari
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5.1. JENIS-JENIS PONDASI DANGKAL 1. Pondasi Telapak Pondasi Telapak Telapak adalah pondasi yang biasanya digunakan untuk menumpu kolom bangunan, tugu/menara, tangki air, pilar jembatan, cerobong asap, dan konstruksi bangunan sipil yang lain. Untuk memudahkan hitungan kontruksi pondasi telapak maka digunakan beberapa anggapan praktis bahwa: a. Plat pondasi adalah kaku sempurna yang tidak melengkung karena beban terpusat dan tetap lurus.
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P=V/A P = desakan pada tanah (ton/) V = gaya tekan (ton) A = luas pondasi ()
Gambar 5.1 Desakan akibat V ( pondasi berbentuk bujur sangkar)
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a.
Karena V akan timbul, desakan terbagi rata. P1 = V / ( by . bx )
b.
Karena pengaruh momen M, akan timbul momen perlawanan ( momen kopel) M’ oleh P P = (1/2) (1/2) bx . P2. by
M’ = P (2) (⅓) . bx = ¼ .bx . P2 . by. (⅔) bx = (1/6) bx . by. P2 dari M’ = M maka ;
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c.
Pengaruh kondisi V dan M p max =
+
p min =
+
p ext =
+
atau,
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Pmin ≥ 0 adalah syarat agar pada dasar pondasihanya terjadi tegangan desak saja, karena tanah tidak dapat menahan tegangan tarik. Bila beban gaya V tidak sentries (eksentris), keadaan ini sama dengan V sentries dengan momen M= V . e , dengan e adalah eksentrisitas dari gaya vertical V .
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Bila gaya V masih bekerja diantara (1/6) . ke kanan dan (1/6) . kekiri dari titik pusat pondasi, jadi garis kerja V masih didalam daerah 1/3 bagian tengah, maka dibawah dasar pondasi hanya timbul tegangan desak saja, sedang 1/3 daerah tengah itu disebut inti/teras (kern)
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;
Resultan desakan tanah pada pondasi. R = ½ . x . Pmax . by dengan garis kerja berjarak 1/3x dari sisi kanan
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Contoh Soal 1:
Untuk mencakupi kebutuhan air bersih pada suatu rumah tinggal, dibuat sebuah tangki air bersih ukuran 1 x 1 x 0,85 (850 liter) dengan tinggi + 3,00 m muka tanah.
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Penyelesaian : 1.
Dihitung beban tengki air
Dinding tangki (4)(1,10)(0,1)(0,85)(240 (4)(1,10)(0 ,1)(0,85)(2400) 0)
= 897,6
Plat lantai tangki (1,20)(1,20)(0,15)(2400) (1,20)(1,20)(0,15)(2400)
= 518,4
Balok plat (4)(1/2)(0,45)(0,15)(0,2)(24 (4)(1/2)(0,45)(0,15)(0,2)(2400) 00)
= 72
Berat air (1)(1)(0,85)(1000) (1)(1)(0,85)(1000)
= 850
Beban orang + penutup seng
= 150
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P min = 0,346-0,746 < 0
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x = 3 (0,5b - e)
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2.Telapak 2.Telapak Kaki Gabungan Gab ungan
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Pondasi kaki gabungan gabungan biasanya berbentuk :
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Untuk gaya lintang D1 = -(112,5 -(112,5 - 37,39) (0,4) D2 = - 45 + (37,39) (1,2) D3 = + (150 – 40.06) (0,4) D4 = + 60 – (40,06) (1,5)
= -30,01 t = - 0,13 t = + 43,97 t = -0,10 t
Untuk momen M1 = (1/2) (1 ( 112,5 - 37,39) (0,4) = 6,009 tm M2 = (45) (1,2 – 0,2) – (37,39) (1,2) (0,6) = 18,079 tm M4 = (1/2) (150 – 40,06)(0,4)= 9,595 tm M3 = (60) (1,5 – 0,2) – (40,06) (1,5) (0,75) = 32,932 tm
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4. Pondasi Mat (Mat Foundation) Pondasi mat termasuk jenis pondasi dangkal,berwujud slab beton yang besar dan luas yang berfungsi meneruskan beban melalui sekumpulan kolom atau dinding ke lapisan tanah dibawahnya. Pondasi mat dapat digunakan bilamana tanah dasar mempunyai daya dukung rendah dan atau harus mendukung beban kolom yang besar. Terdapat 5 type pondasi mat, yaitu: k etebalan seragam • type plat dasar dengan ketebalan • type plat dasar pebalan dibawah pondasi kolom k olom • type plat dengan balok (type plat waffle) • balok dirancang arah memanjang dan melintang dan lokasi kolom pada perpotongan balok tersebut • type plat dengan penebalan pada tumpu kolom (type plat pedestal) • type plat dengan dinding basement sebagai bagian dari pondasi mat Bangunan yang sering menggunakan pondasi mat, antara lain :
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Penurunan Pondasi Mat Dilihat dari perilaku struktur pondasi Pada lokasi dengan daya dukung tanah rendah dapat menggunakan pondai mat. Ada beberapa hal yang harus diperhatikan pada permasalahan penurunan pondasi mat adalah : •
Tegangan kontak antara struktur bangunan dan tanah Semakin kecil tegangan kontak, semakin kecil penurunan yang terjadi.
•
Pengaturan volume tanah yang dipindahkan. Secara teoritis, jika berat tanah yang digali sama dengan berat struktur bangunan dan pondasi (upper structure and substructure), maka tidak akan terjadi penurunan bangunan. Dalam hal ini seolah-olah bangunan