Tuang ben, tuang canh cua d~p Iii lo?i tuang chful dAt. Truang hgp bAt IQ'iv~ 6n djnh Clla tuang Iii ap l\I'c dAt sau lung tuang Ian nhAt ( ddt sau lung tuang bao hoa nuac, co tai tr<.mgben tren m(it ddt. .. ), phia b\ll1g tuang m\l'c nuac thdp nhdt ho(ic khong co nuac.
Cach tinh toan tuang tv nhu d6i v6i than d~p, tlrc Iii vfu1dUng cac cong thUc ( 4- 19), (4-20) va (4-21) nhung thay l\I'c xo ngang ~Qlbfulg ap l\I'c chu dQng cua ddt Ee
va :EQ2 bfulg ap l\Ic bi dQng cua ddt Eb, ho(ic ap l\Ic mrac phia h\1 luu. V6i cac illemg khong cao, d~ don gian trong tiOO toan (va thien an toan ) co th~ b6 qua ap l\Ic bi dQngEb.
Ph\! I\!c 10 gi6i thi~u mQt s6 So' d6 va cong thuc tiOOap l\Ic ddt len tuemg chiin., ta co th~ tham khao d~ tiOOtoano
4.6. TINH ToAN CUONG DQ D~P BE TONG TRQNG LlfC
4.6.1. Khai quat vS ii'ng suit trong than d~p be tong trQng I\l'C va cac yeu cAu vS tinh toan, kiim tra
Xet 1'rngsudt t\1im(it c~t MN Clla than ~p OOuhinh (4-22) ..,j< b t B//// Bj //// M // Q , , Hinh4-22
- D~g chiu l\Ic cua than d~p: D~p 180 mQt k~t cdu vua chiu nen vila chiu u6n.Ap l\Ic nu6c xo ngang Q gay u6n, cac tai tn;mg thfulg d1'rngdo ban than d~p va cac Ap l\Ic nu6c xo ngang Q gay u6n, cac tai tn;mg thfulg d1'rngdo ban than d~p va cac bQ ph~n ben tren :EP gay nen ( I~ch tam).
- D\1ng 1'rngsudt: Do tai tn;mg 180 phuc t\1p nen 1'rngsudt t\1i 1 phan t6 bdt ky
crz, O'x, "1:Xlnoi chung d~u khac khong, vi v~y 1'rngsudt chiOOco phuong khong song
song hay vuong goc v6i tl'\lCz ho(icX.