Determine the cracking moment in kN-m for the section shown if: f'c = 28MPa and fr=0.7√f'c. 600 mm 2 #19 200 mm 100 mm 320 mm 500 mm 80 mm

Part 2,3,4

The bent steel bar shown in Fig. P-906 is 200 mm square. = 4.2 MPa = 29.2 MPa; og 906. Determine the normal stresses at A and B. Ans. .211 A 250 mm- جاش A 200 mm 450 mm Figure P-906. 100 mm 500 kN 3

Pin-connected rigid bars AB, BC, and CD are initially held in the positions shown by taut wires (1) and (2). The bar lengths are a = 36 ft and b = 27 ft. Joint Cis given a horizontal displacement of 5.7 in. to the right. (Note that this displacement causes both joints B and C to move to the right and slightly downward.) What is the change in the average normal strain in wire (1) after the displacement? B (1), a (2) Answer: = i (0)

SOLVE

Determine the maximum moment in kip-ft for the beams shown below using th method of consistent deformations. Select the reaction at the interior support to b the redundant. Express your answer in absolute value and use two decimal places 3 k/ft -B 25 ft 15 ft 21 E = 29,000 ksi I= 2,500 in.+

The brass rod AB is fixed connected at A. When the temperature is T₁-50 °C, there is a 3 mm gap between its end (point B) and the wall C. The cross-sectional area of the rod is 10 cm². Ignore the weight of the bar. The temperature is now increased to T₂-130 °C and the rod AB is pushing against the wall at C. Ebr = 100 GPa, abr = 20 x 10-6/°C Fallow 70 MPa L = 3m A 3 m B/C с 3 mm a. Draw a FBD for when the temperature is increased to T₂ and write down the force balance for this scenario. Call the reactions at FA and FC. Ton =1) und prit brolim volgen Aistis Intelesa si s b. State the compatibility condition and solve for the reactions at A and C.

A rigid bar AB is hinged at A and supported by copper rod 2 m long and steel rod i m long as shown in fig. the bar carries a load of 20 KN at B. the cross section areas of steel and copper are 200 mm2 and 400 mm2 respectively find the stress in each rod if Es=210 GPa and Ec=83 ?GPa Copper rod- Steel rod- -1 m- 1m 2 m 2 m -1 m- B 20 kN