help in question 7 please Questions 4 to 9 refer to an experimental test of a ca
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help in question 7 please
Questions 4 to 9 refer to an experimental test of a cantilevered W36x150 A992-50 beam conducted by Eatherton et al. (2013)1, which we discussed in class. A time-lapse video of the response is here: Lckt&index=16). A summary of the flexural response is shown below: 4. (2 points) Compute the theoretical 3000 2000 100.-+ nominal yield moment, My (k-ft) 5. + (2 points) Compute the theoretical moment corresponding to first-yiel accounting the effects of residual stresses, Mr (k-ft). Use the AISC approximation. . 1000 2000 -3000-. 4000 -"-- 6. 2 points) Compute the theoretical plastic moment, Mp (k-ft). 7. (2 points) Why don't the test results match the experimental results? 4 3 -21 0 1 2 3 4 Story Drift Ratio(%) Figure 52: Specimen 1 (W36) Hysteresis 8. 1 point) Is flange local buckling (FLB) a concern? 9. (1 point) Is lateral-torsional buckling (LTB) a concern? 10. (5 points) Determine the plastic moment capacity, Mp (k-ft), and shape factor, f for a built-up I shaped girder ("plate girder") consisting of 1/2-in. thick by 6-in. wide flange plates welded to a 5/16-in. thick by 17-in. tall web plate. Calculate the shape factor for both the strong and weak axis. For this example, assume A36 steel. 1 Toellner, B.W. (2013) Evaluating the Effect of Decking Fasteners on the Seismic Behavior of Steel Moment Frame Plastic Hinge Regions, M.S. Thesis, Virginia Tech. Homework 3 Page 1Explanation / Answer
in many cases test resuts do not match the experimental results because of the following reasons:-
1. due to shape and size of the members. in actual our members may be too large but we are testing on a similar small member so shape factor arise.
2. Due to stress concentrations which is most possible in case of complex structure or actual structures than in small specimen.
3. due to misalignments or grip between structures and testing machines which is possible in actual members due to which test does not become so accurate and variation occurs.
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