Question

A structural tee is used to connect the beam to the column as shown in the figure. Eight 3/4" - diameter, A325N, fully tightened bearing-type bolts are used to attach the flange of the tee to the column flange. Check whether the connection (tee-to-column connection) is adequate when a dead load of D = 20 kips and live load of L = 40 kips are applied with an eccentricity of 2.75 inches. All structural steel is A992. Use both Case I and Case II methods.

Dz20kips L=40kips e-2.75in. 3@3in. 0 | 、wT 10.5x31 1.5in. W 10X49 8in.

Answer 1

Given that a structural tee connect the beam to the column. Diameter of bolts (D) = 3/4 inch Dead load (D) = 20 kips Live load (L) = 40 kips. Eccentrecity = 2.75 inches A 992 steel is used for all structure for checking whether the connection is adequate (or) not p_11 = 1.2 D + 1.6 infinity p_11 = 1.2D + 1.6 infinity = 1.2 [20] + 1.6 [40] = 20 + 82.8 implies p_11 = 112.6 kips. star Bearing strength of column implies 7/8 + 1/16 implies 0.875 + 0.0625 h implies 09375 inch star shear bearing per bolt: - implies shear of bolt = Pu/8 No. of bolts = 8 implies shear of bolt = 14.075 kips star Lc for edge bolts: - implies alpha c = alpja e - b/2 = 2 - 0.475/2 implies Lc = 1.531 Pn implies p n = phi [1.2 phi c + f y] = 0.7 pi[1.2 times [1.53] + (0.64 times 58)] = 0.7 pi [1.836 + 37.12] implies pi Pn = 29.217 kips