CONTOH HITUNG PEMBEBANAN PADA ATAP

	LOADING (ROOFING FOR BLOWER ROOM DELTAMAS ZONE C)
1	Permanent load
1.a	Rafter
	Roofing (Semen Asbes)	=	11	kg/m²
	Gording	=	5	kg/m²
	Live/Rain	=	20	kg/m²
	Total	=	36	kg/m²
	α	=	30	º	cos = 30º =	0,866
	L		3	m	sin = 30º =	0,5
	q (Wt)		108	kg/m
2	Quake load
	V = C . I . Wt
	C = coefficient quake	=	0,05
	I = factor	=	1,5
	Wt = Weight total	=	108	kg
	V = 0.05 x 1.5 x Wt	=	81	kg
2.a	Dead Load
	Sheet roofing	=	11x3x50/cos 30º	=	1905,311778291	Live Load	= 90% x LL x Lengt x 50	=	2700	kg
	Gording	=	5x3x50/cos 30º	=	866,0508083141		(90% is coefficient live load)
	Kleding	=	2x10x3x5	=	660
	Kuda-kuda utama	=	15x3x50	=	2250	Wt	= BM + BU	=	10732,6567491917	kg
	Beam long	=	5x30x3	=	540
	Column	=	2x9x76	=	1368	V	= 0.075 x Wt	=	804,9492561894	kg
	Conection Gording	=	2x0.89x50/cos 5º	=	102,7713625866
	Beam wall	=	2x30x3	=	216
	Wall bonds Φ 19 mm	=	4x2.23x7.81	=	69,6652
	Wind bonds	=	4x1.58x8.68	=	54,8576
	Total			=	8032,6567491917
3	Wind Load
	Wind	=	25	kg/m²		Coefficient negatif wind pressure
	α < 65º → coefficient positif wind pressure					- roofing/wall	=	0,4
	- roofing	=	0.02 x α - 0.4	=	0,2
	- wall	=	(+) 9
	Roof of Left:
	W1	=	(-0.3 x wind x leingt)	=	-22,5	kg/m	√
	W1 cos α			=	-19,485	kg/m	√
	W1 sin α			=	-11,25	kg/m	√
	Roof/Wall of Right:
	W2	=	Cn x Wind x Leingt	=	30	kg/m	√
	W2 cos α			=	25,98	kg/m	√
	W2 sin α			=	15	kg/m	√
	Wall of right
	W3	=	0.91 x Wind x Leingt	=	68,25	kg/m
	Note: Kekuatan Screw/Baut M8 = 1 KN = 100 kg Safety (Screw/Baut) ~> 100 Kg > W2 OK! Screw/Baut = 4 Pcs/180cm
	Cara Pasang Atap: 1. Bidang tindih ( tumpukan ) minimal 10 – 15 cm. 2. Tumpukan samping antar gelombang adalah 10cm atau 2 gelombang. 3. Jarak gordeng adalah maksimal 100 cm. 4. Paku/screw roofing minimal 12pcs untuk ukuran atap 180cm2. 5. Pastikan saat handak di paku, atap di tusuk terlebih dahulu. 6. jika menggunakan screw roofing, pastikan saat pengeboran tidak miring. 7. Silent sisi kepala roofing untuk pengeboran yang terlanjur miring (agar tidak bocor) 8. Untuk pemasangan di kayu dan mengunakan paku payung, jangan lupa menggunakan karet.