Đánh giá liên kết bàn đế chân cốt thép

ELASTIC STIFFNESS OF COLUMN BASE Code: Eurocode The initial elastic stiffness in rotation of the column base: �_(�.���)=�_��/� Φ: the column base rotation: �=(�_(�,�)+�_(�,�))/�=1/(��^2 ) ((�_��+�_�� �_(�,�))/�_(�,�) +(�_��−�_�� �_(�,�))/�_(�,�) ) ● Forces on column base: Nsd = Msd = 400 kN 250 kNm ● Geometry: z= zt,l = zc,r = 120 mm 60 mm ● Stiffnesses: E: Modulus of steel E= 210000 MPa The bolt stiffness coefficient for the component method is defined as: �_�=�/(��_� )=2 �_�/�_� where: As: net area of bolts Lb: length of anchor bolts Lb = → kt,l = kc,r = →Φ= → sj.ini = 20 mm for bolt diameter As= 350 mm 1.80 mm 0.092 rad 2,714 kNm/rad Classification of column base for Sway frame columns: Steel column: Moment of inertia: Ic = 3.23E+08 mm4 Length of column: Lc = → 30EIc / Lc = 7.6 m 267,418 kNm/rad > 1/2 sj.ini 314 mm2 ELASTIC STIFFNESS OF COLUMN BASE Joint type: SEMI RIGID (Almost pinned) 2/2