Consider a W14x43 (Fy = 100 ksi) used as a compression member in a truss with Lc = 5 ft. What is the design compression strength for this member about the weak axis?
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- A large precast concrete panel for a warehouse is raised using two sets of cables at two lift lines, as shown in the figure part a. Cable 1 has a length L1 = 22 Ft, cable 2 has a length L2= 10 ft, and the distance along the panel between lift points Band D is d = 14 ft (see figure part b). The total weight of the panel is W = 85 kips. Assuming the cable lift Forces F at each lift line are about equal, use the simplified model of one half of the panel in figure part b to perform your analysis for the lift position shown. Find the required cross-sectional area AC of the cable if its breaking stress is 91 ksi and a factor of safety of 4 with respect to failure is desired.A bungee jumper having a mass of 55 kg leaps from a bridge, braking her fall with a long elastic shock cord having axial rigidity EA = 2.3 kN (see figure). If the jumpoff point is 60 m above the water, and if it is desired to maintain a clearance of 10 m between the jumper and the water, what length L of cord should be used?Continuous cable A DB runs over a small friction less pulley al D to support beam OABC, which is part of an entrance canopy for a building (see figure}. The canopy segment has a weight W = 1700 lb that acts as a concentrated load in the middle of segment AB. (a) What is the maximum permissible value of load P at C if the allowable force in the cable is 4200 lb? (b) If P = 2300 lb, what is the required diameter of pins A, B, and D? Assume that the pins are in double shear and the allowable shear stress in the pins is 10 ksi.
- The following figure represents a 3-nodes, two-element truss structure with identical cross-sectional area A = 100 mm2 and modulus E = 200 GPa for each element. It is supported by a pin at global node 1, an inclined roller at 135˚ at global node 2 and a horizontal roller at global node 3. A force P = 400 kN is applied at global node 2. Using the direct approach and the minimum number of linear finite elements, what would be the displacement at the global node 2 of the inclined roller in its local coordinate system? Select one: û2 = 2.83 mm û2 = 8.32 mm û2 = 3.83 mm û2 = - 6.32 mmFor the truss given below, it is desired to determine the normal efforts that act on the members, so that, thus, possible constraints for its design are possible. Consider that at point A there is a second gender support; and at point D, a first-class support. As this is asked: what is the effort acting on bar AB? Is it guidance or assessment?Source: Hibbeler (2004, p. 588). HIBBELER, R. C. Resistance of Materials. 5. ed. Rio de Janeiro: Technical and Scientific Books Publisher, 2004. Question 1 options: a) A compression force of 100 kN acts on bar AB. B) A tensile effort of 100 kN acts on bar AB. c) A compressive force of 141.42 kN acts on bar AB. d) A compression force of 200 kN acts on bar AB. e) A tensile effort of 141.42 kN acts on bar AB.Find the residual forces acting in a truss with members AC=1000N (T), EG=520N (T), and FH=1200N (C) as indicated in Figure 2. Determine the loads P1, P2, and P3 as well.
- Find the residual forces acting in a truss with members’ AC=1000N (T), EG=520N (T), and FH= 1200N (C)as indicated in Figure 2. Determine the loads P1, P2, and P3 as well.The doubly-symmetric beam cross section shown in Figure P12.3b has been proposed fora short foot bridge. The cross section will consist of two identical steel pipes that are securelywelded to a steel web plate that has a thickness of t = 9.5 mm. Each pipe has an outside diameterof d = 70 mm and a wall thickness is 5 mm. The distance between the centers of the two pipes ish = 370 mm. Internal forces of P = 13 kN, V = 25 kN, and M = 9 kN·m act in the directionsshown in Figure P12.3a. Determine the stresses acting on horizontal and vertical planes:(a) at point H, which is located at a distance of yH = 120 mm above the z centroidal axis.(b) at point K, which is located at a distance of yK = 80 mm below the z centroidal axis.Show the stresses on a stress element for each point.The doubly-symmetric beam cross section shown in Figure P12.3b has been proposed fora short foot bridge. The cross section will consist of two identical steel pipes that are securelywelded to a steel web plate that has a thickness of t = 9.5 mm. Each pipe has an outside diameterof d = 70 mm and a wall thickness is 5 mm. The distance between the centers of the two pipes ish = 370 mm. Internal forces of P = 13 kN, V = 25 kN, and M = 9 kN·m act in the directionsshown in Figure P12.3a. Determine the stresses acting on horizontal and vertical planes:(a) at point H, which is located at a distance of yH = 120 mm above the z centroidal axis.(b) at point K, which is located at a distance of yK = 80 mm below the z centroidal axis.Show the stresses on a stress element for each point.FIGURE P12.3a FIGURE P12.3bP12.5 An extruded polymer flexural member is subjected to an internal axial force of P = 580 lb,an internal shear force of V = 420 lb, and an internal bending moment of M = 6,400 lb·in.,…
- I need to draw a free body diagram and the solution m2=88kgA wooden mast, with a uniform diameter of 30 cm, is built into a concrete block, and is subjected to a horizontal pull at point 10 m from the ground. The wire guy A is to be adjusted so that it becomes taut and begins to take part of the load when the mast is loaded to a maximum stress of 7 MN/m2. Estimate the slack in the guy when the mast is unloaded. Take E for timber = 10 GN/m2. (Cam bridge)In a small gantry for unloading goods from a railway waggon, it is proposed to carry the lifting tackle on a steel joist, 24 cm by 10 cm, of weight 320 N/m, supported at the ends, and of effective length 5 m. The equivalent dead load on the joist due to the load to be raised is 30 kN, and this may act at any point of the middle 4 m. By considering the fiber stress and the shear, examine whether the joist is suitable. The flanges are 10 cm by 1.2 cm, and the web is 0.75 cm thick. The allowable fiber stress is 1 15 MN/m2, and the allowable shearing stress 75 MN/m2.