Perencanaan Gording Kayu

 

A.		DATA PERENCANAAN
		Jenis Kayu		:	Kruing
		Berat Jenis		:	850	kg/m³
		Alat Sambung		:	Baut
		Penutup Atap		:	Genteng plentong
		Berat Penutup Atap		:	50	kg/m²
		Berat Plafond & Penggantung		:	18	kg/m²
		Sudut Kemiringan Atap		:	35	⁰
		Bentang		:	12	m
		Tekanan Angin		:	30	kgf/m
		Jarak Antar Kuda-Kuda		:	2	m
		σlt		:	144.5	kg/cm²
		σtr// = σtk//		:	127.5	kg/cm²
		σtk ^		:	34	kg/cm²
B.		PERHITUNGAN PANJANG BATANG
		Bentang		=	12	m
		H1 = H2 = H3 = H4		=	3	m
		V1 = V3		=	3	m
		V2		=	6	m
		A1 = A2 = A3 = A4		=	4.2426407	m
		D1 = D2		=	6.7082039	m
		Total Panjang Kayu		=	54.386971	m
C.		PERHITUNGAN DIMENSI GORDING
		Data Perhitungan Gording
		Jumlah Gording		=	5
		Kemiringan		=	35	⁰
		Jarak Gording		=	4.2426407	m
				=	424.26407	cm
		Jenis Kayu		=	Kruing
		Berat Jenis		=	850	kg/m³
		Dimesi		=	10	/	14	cm
		Jarak Antar Kuda-Kuda		=	2	m
		Beban Mati
		Berat Gording		=	Dimesi x Berat Jenis
				=	11.9	kg/m
		Berat Penutup Atap		=	Jarak Gording x Berat Penutup Atap
				=	212.13203	kg/m
		Faktor Keamanan	(10%)	=	10%	x	q total
				=	22.403203	kg/m
		Beban Terfaktor	(qm)	=	246.43524	kg/m
			qx	=	qm sin α
				=	141.34945	kg/m
			qy	=	qm cos α
				=	201.86793	kg/m
			Mxi	=	1/8 qx L²
				=	70.674723	kgm
			Myi	=	1/8 qx L²
				=	100.93396	kgm
		Beban Hidup
		Berat Pekerja		=	100	kg
			P	=	100	kg
			Px	=	Hp sin α
				=	57.357644	kg
			Py	=	Hp cos α
				=	81.915204	kg
			Mpx	=	1/4 Hx L
				=	28.678822	kgm
			Mpy	=	1/4 Hx L
				=	40.957602	kg
		Beban Angin
		Koef. Tekan		=	0.02	α	-	0.4
				=	0.3
		Koef. Hisap		=	-0.4
		Beban Angin Tekan	qat	=	Jarak Gording x Tekanan Angin x Koef. Tekan
				=	38.183766	kgm
		Beban Angin Hisap	qah	=	Jenis Kayu x  Tekanan Angin x Koef. Hisap
				=	-50.91169	kgm
			Mat	=	1/8 qat L²
				=	19.091883	kgm
			Mah	=	1/8 qah L²
				=	-25.45584	kgm
		Beban Kombinasi ( Beban Tetap )
			Mx	=	1.2 Mxi + 1.6 Mpx
				=	130.69578	kgm
			My	=	1.2 Myi + 1.6 Mpy
				=	186.65292	kgm
		Beban Kombinasi ( Beban Sementara )
		Beban air hujan		=	0.5	kg/m²
			qh	=	Beban air hujan x Jarak Gording
				=	2.1213203	kg/m
			qhx	=	qh sin α
				=	1.2167394	kg
			qhy	=	qh cos α
				=	1.7376839	kg
			Mhx	=	1/8 qhx L²
				=	0.6083697	kgm
			Mhy	=	1/8 qhy L²
				=	0.8688419	kgm
			Mx (Tk)	=	Mat + Mhx
				=	19.700253	kgm
			Mx (Hs)	=	Mah + Mhx
				=	-24.84747	kgm
			My	=	0.8688419	kgm
		Penentuan Beban Kombinasi
		Beban kombinasi diambil yang terbesar
			Mx	=	130.69578	kgm
				=	13069.578	kgcm
			Mx	=	186.65292	kgm
				=	18665.292	kgcm
		Kontrol tegangan
			σlt	=	144.5	kg/cm²
				<	σlt
			97.148	<	144.5	AMAN
		Kontrol Lendutan
			Fijin	=	1/200 L
				=	0.01
			E kayu	=	125000	kg/cm²
			Ix	=	1/12 b h³
				=	2286.6667	cm⁴
			Iy	=	1/12 b³ h
				=	1166.6667	cm⁴
			Fx	=
				=	0.0025756	+	0.0003344
				=	0.0029101
			Fy	=
				=	0.0072096	+	0.0009362
				=	0.0081457
			F total	=
				=	0.0086499
			F total	<	F ijin
			0.0086	<	0.01		AMAN
		Maka dimensi gording 10/14 aman digunakan