== Delft University of Technology == Give on the upper right. Exam STATICS /
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1 == elft University of Technology == Give on the upper right University ourse pplied Mechanics corner of each sheet your NME STUY NUMER and ISIPLINE Exam STTIS / The work of a student who does not fulfill the requirements for taking an exam will not be marked. Notes Only hand in the answer sheets. ny other sheets will not be accepted. Write your name and study number on every sheet. Sheets without name and study number will not be accepted. Write relevant calculations on the answer sheets. Use the blank sides of the answer sheets if necessary. nswers without calculation are not taken into account. Provide the answers with units when applicable. Use possible checks in order to avoid calculation errors. The order of answering the questions is free. N..: this exam consists of 6 problems. The neatness of the presentation of the answers will be considered in the marking. Unless otherwise stated the following holds: Pulleys, hinged joints and supports with hinges are frictionless. The weight of the structure is not taken into account.
2 Problem 1 (weight 1,0 - about 20 minutes) beam is loaded perpendicular to its axis by a distributed load q q=q(x) q ( x). z x a. Sketch the positive internal forces and moments acting on a beam element with an infinitesimal length x. b. erive the differential equations for the equilibrium of this beam element. c. erive (using the previous result) also the relation between the bending moment M in the beam and the distributed load q. x 1
3 Problem 2 (weight 1,8 - about 30 minutes) The truss represented in the figure below has a hinged support in and a roller support in. imensions can be read from the figure using the grid, the grid distance is 1 m. The loads can be read from the figure as well. 1 m 1 m S 10 kn (2) 30 kn (3) (4) G E (1) a. etermine the horizontal and vertical component of the reaction forces in and. Sketch these forces in the figure in the directions in which they act and give their values. b. etermine by means of the method of sections the force in bar (1). learly indicate the section used. c. etermine by means of the method of sections the force in bar (2). learly indicate the section used. d. etermine by means of the method of sections the force in bar (3). learly indicate the section used. e. etermine the force in bar (4). The choice of method is free. f. ssemble the previous results in the table with the correct signs for tension and compression 1. 1 Tension positive, compression negative. 2
4 Problem 3 (weight 2,0 - about 30 minutes) The girder S, represented in the figure below, is clamped in and supported in by bar. The girder has a hinge in S. imensions can be read from the figure. The girder supports a uniformly distributed load q over its total length. q S l l l a. etermine the reaction forces in and. In the figure, sketch these forces in the directions in which they act and give their values. b. Sketch for S the shear force diagram and give their va lues. larify by means of the deformation signs (or plus and minus sign) the directions in which the shear forces act. c. Sketch for S the moment diagram and give their values. larify by means of the deformation signs (or plus and minus sign) the directions in which the moments act. Sketch in, and the tangents to the moment diagram and show clearly the intersection of these tangents. 3
5 Problem 4 (weight 2,0 - about 35 minutes) The structure represented in the figure below is made up by bars,, and E connected by hinges as displayed in the figure. imensions and loading can be read from the figure. 3 m 3 m 30 kn 4 m E 5 m 3 m a. etermine the reaction forces in and E. In the figure, sketch these forces in the directions in which they act and give their values. It is allowed to change the order of questions b and c. b. etermine and sketch the moment and shear force diagram of bar E and give their values. larify by means of the deformation signs (or plus or minus sign) the directions in which the moments and shear forces act. c. etermine the normal force in and with the correct signs (tension positive, compression negative). 4
6 Problem 5 (weight 2,0 - about 35 minutes) eam is situated in the horizontal plane, supported in by a bal-and-socket joint and in by cables and E. imensions can be read from the figure. The beam is loaded in by a vertical force of 30 kn. y E 2m 9m 3m 6m 2m z 30 kn x a. etermine the (horizontal and vertical components of the) reaction forces in. In the figure, sketch these forces in the directions in which they act and give their values. b. etermine the (horizontal and vertical components of the) reaction forces in E and. In the figure, sketch these forces in the directions in which they act and give their values. c. etermine the normal force in the cables and E. 5
7 Problem 6 (weight 1,0 - about 30 minutes) +254 m m 536 In the figure above the dimensions of the suspension bridge over the Storebaelt (Great elt) in enmark can be read. The load in the cable due to its weight, bridge deck and other loads due to traffic can be regarded as a uniformly distributed load of 279 kn/m. 279 kn/m middle span: 1624 m etermine as a result of the uniformly distributed load of 279 kn/m : a. The horizontal component of the cable force in middle span b. The maximum cable force in the middle span. Where does this maximum force occur? 6
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