SteelStair.xls

	A	B	C	D	E	F	G	H	I	J	K	L	M	N
1
2				PROJECT :								PAGE :
3				CLIENT :								DESIGN BY :
4				JOB NO. :			DATE :					REVIEW BY :
5	Steel Stair Design Based on AISC-ASD 9th
6
7	INPUT DATA & DESIGN SUMMARY
8	COLUMN SECTION (Tube or Pipe)				= >	HSS4X4X1/4
9		Tube	A	rmin	t	h
10			3.37	1.52	0.23	4.00
11	FLOOR BEAM - 1				= >	W16X26
12			A	d	Ix	Sx
13			7.68	15.70	301.00	38.40
14	STRINGER - 1 (Channel or Tube)				= >	MC8X8.5
15		Channel	A	d	Ix	Sx
16			2.50	8.00	23.30	5.82
17	STRINGER - 2 (Channel or Tube)				= >	C12X20.7
18		Channel	A	d	Ix	Sx
19			6.08	12.00	129.00	21.50
20	LANDING BEAM - 1 (Channel or Tube)				= >	C8X18.75
21		Channel	A	d	Ix	Sx
22			5.51	8.00	43.90	11.00
23	LANDING BEAM - 2 (Channel or Tube)				= >	C8X18.75
24		Channel	A	d	Ix	Sx
25			5.51	8.00	43.90	11.00
26
27	DIMENSIONS		H =	16	ft, story Ht
28			L1 =	12	ft
29			L2 =	6	ft
30			L3 =	10	ft
31
32	NUMBER OF STORIES			n =	2
33
34	GRAVITY LOAD		DL =	50	psf
35			LL =	100	psf
36
37
38	THE STAIR DESIGN IS ADEQUATE.
39
40
41	ANALYSIS
42
43	STRINGER - 1
44
45
46							q =	33.69	deg, from horizontal
47							w = 0.25 (DL / Cos q + LL) L3 =				400	plf , projected
48							R = 0.5 w L1 =		2.40	kips
49							M = w L12 / 8 =		7.20	ft-kips
50							fb = M / Sx =		14.85	ksi
51							Fb = 0.6 Fy =		21.60	ksi	>	fb	[Satisfactory]
52							E =	29000	ksi
53		12					DLL = 5 (wLL Cos q) (L1 / Cos q)4 / (384 E I) =					0.46	in
54		6					<	(L1 / Cos q) / 240 =		0.72	in		[Satisfactory]
55
56
57
58
59
60	LANDING BEAM - 1
61
62							w = 0.5 (DL + LL) L2 =			450	plf
63							P =	2.40	kips, from STRINGER - 1
64							R = 0.5 w L3 + P =			4.65	kips
65							M = w L32 / 8 + P L3 / 2 =			17.63	ft-kips
66							fb = M / Sx =		19.23	ksi
67							Fb = 0.6 Fy =		21.60	ksi	>	fb	[Satisfactory]
68							DLL = 5 wLL L34 / (384 E I) + PLL L33 / (24 E I) =					0.14	in
69							<	L3 / 240 =		0.50	in		[Satisfactory]
70
71
72														(cont'd)
73	STRINGER - 2
74
75
76							w =	400	plf , projected, from STRINGER - 1
77							P =	4.65	kips, from LANDING BEAM - 1
78							RL = [w L1 (0.5 L1 + L2) + P L2] / (L1 + L2) =					4.75	kips
79							RR = [w L1 (0.5 L1) + P L1] / (L1 + L2) =					4.70	kips
80							X = RL / w =		11.87	ft, from left
81							Mmax = RL X - (0.5 w X2 ) =			28.21	ft-kips
82							fb = Mmax / Sx =		15.75	ksi
83							Fb = 0.6 Fy =		21.60	ksi	>	fb	[Satisfactory]
84							DLL = 5 wLL (L1 + L2)4 / (384 E I) + PLL (L1 +L2)3 / (48 E I) =							0.24
85							<	(L1 + L2) / 240 =		0.90	in		[Satisfactory]
86
87
88	LANDING BEAM - 2
89
90							w =	450	plf, from LANDING BEAM - 1
91							R = 0.5 w L3 =		2.25	kips
92							M = w L32 / 8 =		5.63	ft-kips
93							fb = M / Sx =		6.14	ksi
94							Fb = 0.6 Fy =		27.60	ksi	>	fb	[Satisfactory]
95							DLL = 5 wLL L34 / (384 E I) =			0.05	in
96							<	L3 / 240 =		0.50	in		[Satisfactory]
97
98	FLOOR BEAM - 1
99
100							L =	12	ft