546 



STRUCTURAL MECHANICS. 



CHAP. XVI. 



DIAGRAMS. 



OEMERAL FORMULAS. 



F s --l6 t OOO,f c =650,n--l5. 



61. RECTANGULAR B[AHS:Reinforced 

 For tension only: 



7 C 



J f -/ Is 



\ : M W^T 



f-M . fl . 

 5 ~Ajd'pjbd*' 



k= 0.579; 

 j=0.8757; 



\F^n\ \ b 



K * K- X 



Steel rat hand depth, balanced reioForcemtnt, 



/ . 

 ' 



F c =650; 



Steel ratio and depth, 

 balanced reinforcement, 



P = 



6L SLABS: yalues Forlf'strip. 

 Reinforced For tension only. 



kd 



7 1 <? 



M s =%djd=. 



F-L-JL - 

 * Ajcl'Kpjd*' 



Steel ratio and depth, balanced reinforcement, 

 ' 



T c nF c 



j =0.8737 ; 

 M 5 = 1290 d 2 ; 



M -M 

 / /c -HS > 



F 5 ? 16000; 

 F c =650; 

 5 tee I ratio, depthand steel 

 area, balanced reinforcement 

 p =0.0077 ; 

 d=0.028]/W ; 



_ T/. J* 



5. T~E>EAM5:Neqlect!nq compression 

 in Web. Fort"qreiterthan"kd"u$e6l. 



:/S. b 

 \ CJ3 r ;* - -fH 



r~i i 1 7 i* i T i 



w^r.4. 





3d 2kd-t ' 



F= J = JL .p = J<_F . 



Ajd pjbd (l-k)n 

 Steel ratio, balanced reinforcement, 



._/ t U37d-?t 

 J 3d0.758d-t 

 M 5 = 160 00 pjbd 2 



F 5 =I6000;F C =650 S 



Steel rat io, balancedreinF. 



V-)t; 

 d j d' 



64. RECrAH6ULARBEAM5:ReinForced 

 For tens ion and compression. 



rd-d'-, : g . 

 '.+ *-- 



J* 





(Fklpn 



j=fspjbd z j /% r 4 

 . /V_ M _ . c'.ff-r e . r_ k 



~ .00478+(.}19-r)p f 

 M 5 use general Formula 



Steel ratio, balanced reinFor cement, 



X >1 



Steel ratio, balanced 

 reinforcement, 



