Draft
5.1Reactions 91
- Isolatingbd:
(+
) Md= 0; (17:7)(18) (40)(15) (4)(8)(8) (30)(2)+Rcy(12)= 0)Rcy=
1 ; 236
12
= 103 k 6
(+
) Mc= 0; (17:7)(6) (40)(3)+ (4)(8)(4)+ (30)(10) Rdy(12)= 0)Rdy=
201 : 3
12
= 16.7k 6
- Check
Fy= 0; 6 ; 22: 2 40 40 + 103 32 30 + 16:7 = 0
p
Example5-3: ThreeHingedGableFrame
Thethree-hingedgableframesspacedat 30ft.oncenter. Determinethereactionscompo-
nents ontheframedueto: 1) Roof deadload,of 20psfof roof area;2) Snow load,of 30psf
of horizontalprojection;3) Windloadof 15psfof verticalprojection. Determinethecritical
designvaluesfortheverticalandhorizontalreactions.
Solution:
- Dueto symmetry, we willconsideronlythedeadloadononesideof theframe.