WebTaperedGirder.xls

	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O
1
2				PROJECT :								PAGE :
3				CLIENT :								DESIGN BY :
4				JOB NO. :			DATE :					REVIEW BY :
5	Web Tapered Girder Design Based on AISC-ASD 9th, Appendix F
6
7	INPUT DATA & DESIGN SUMMARY
8	STEEL YIELD STRESS				Fy =	36	ksi
9	SIMPLY SUPPORTED SPAN				S =	84.67	ft
10	SUPERIMPOSED DEAD LOAD				DL =	0.48	kips / ft
11	LIVE LOAD				LL =	0.288	kips / ft
12	FLANGE WIDTH				bf =	12	in
13	FLANGE THICKNESS				tf =	0.625	in
14	WEB THICKNESS				tw =	0.3125	in
15	HEEL DEPTH				d0 =	22	in
16	MID-SPAN DEPTH				dL =	60	in
17	DISTANCE BETWEEN STIFFENERS				a =	7.2	ft
18
19	UNBRACED LENGTH / PURLIN SPACING				L =	7.2	ft
20				(Diaphragm is not bracing member. L is different with " l " in F1.3, pg 5-47)
21
22		THE GIRDER DESIGN IS ADEQUATE.
23
24	ANALYSIS
25	TOTAL SUPERIMPOSED GRAVITY LOAD
26	w = DL + LL =		0.768	kips / ft
27
28	ALLOWABLE FLEXURAL STRESS (APP. F7.4, pg 5-103)
29
30
31
32								=	21.60	ksi
33
34
35	where	Af =	7.50	in2
36		g = MIN[(dL - d0) / d0 , 0.268 L/d0, 6.0] =					1.05
37		ATo = tf bf + d0 tw / 6 =			8.65	in2
38		ITo = (tf bf3 + d0 tw3 / 6) / 12 =				90	in4
39
40				3.23	in						34.18	ksi
41
42
43					1.39	in					192.93	ksi
44
45
46					1.11	in					1.37
47
48
49	ALLOWABLE SHEAR STRESS (F4, pg 5-49)
50
51
52					=	5.63	ksi
53
54
55	where	h = dL - 2 tf =		59	in
56		h / tw =	188	>	380 / Fy0.5 =		63
57													=	0.45
58
59						=	7.19
60
61
62
63
64
65														(cont'd)
66	CHECK EACH SECTION CAPACITIES
67
68	Section	HEEL	1/24 S	1/12 S	1/8 S	1/6 S	5/24 S	1/4 S	7/24 S	1/3 S	3/8 S	5/12 S	11/24 S	MID
69	Distance	0	3.53	7.06	10.58	14.11	17.64	21.17	24.70	28.22	31.75	35.28	38.81	42.34
70	d (in)	22	25	28	32	35	38	41	44	47	51	54	57	60
71	I (in4)	2092	2790	3603	4535	5592	6778	8099	9559	11163	12917	14826	16893	19125
72	Wt (plf)	73.1	76.5	79.8	83.2	86.6	89.9	93.3	96.7	100.0	103.4	106.8	110.1	113.5
73	V (kips)	36.46	33.49	30.51	27.51	24.50	21.48	18.45	15.40	12.34	9.28	6.20	3.10	0.00	<== User can modify M & V per actual loads.
74	M (ft-k)	0	123	236	339	430	511	582	642	691	729	756	772	778	Before modify, make a copy first.
75	fv (ksi)	5.30	4.26	3.45	2.79	2.26	1.82	1.44	1.12	0.83	0.59	0.37	0.17	0.00
76	fb (ksi)	0.00	6.68	11.15	14.11	16.01	17.13	17.68	17.79	17.57	17.09	16.42	15.59	14.64
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93		fb,max =	17.79	ksi @	24.70	ft, from heel.
94			<	Fb =	21.60	ksi
95			[Satisfactory]
96
97
98
99
100