Extreme Loading of Structures CVEN90026 Semester One 2024 page 1 of 9 Assignment on Impact Action Students may work as individuals, or in pairs Report is due for electronic online submission at 10am on Friday the 12th of April 2024 Further instructions on how to submit on line will be given The objective of this assignment is to Determine the effects of increasing the span length of a simply-supported column element when subject to impact Part I - calculation by hand and by Excel spreadsheet Prepare Excel spreadsheet for calculating the maximum horizontal deflection of a simply supported steel column along with the equivalent (quasi-static) force and bending moment at mid-span when subject to the impact of a solid object of mass m flying horizontally with velocity v, striking the column at the mid-height position, as shown on the diagram in below. Provide your estimate based on the following information: Mass of impactor m = 80 kg, vo = 10 m/s. The steel column has EI = 8 x 104 kNm2, and has a self-weight of 860 kg per m length. Calculations are required for height h = 0.75 m, 1.5 m and 2.5 m The impactor rebounds with a Coefficient Of Restitution of 0.10 Linear elastic behaviour of the steel column may be assumed. h Have the results for different column heights presented in the form of graphs Prepare hand calculation showing the steps for at least one column height.
Extreme Loading of Structures CVEN90026 Semester One 2024 Students may work as individuals, or in pairs page 2 of 9 Part II - Impact experiments of miniature scale that can be conducted safely at a place of your own choice (eg. at home) and without requiring much space Clamps may be required to secure the beam in position at support points. h K L Note : A does NOT include the deflection of the beam due to its own weight D Task items to complete : 1.Obtain a miniature specimen of a single span beam with span length (L) of about 500 mm. Measure natural period of vibration of the beam by the use of an accelerometer (in a cell phone) and use the measured result to infer the bending stiffness of the beam specimen. 2.Look for an impactor object which will give a static deflection of about 10 mm. 3.Drop the impactor onto the beam at mid-span position from a certain height (h) in order that A is 50 mm approximately. A higher deflection value is acceptable provided that the impact does not cause damage to the beam. 4. Repeat the drop test from the same height and same impactor as Step 3 with a beam which is double the span length of the beam used in item (1) above. Submit report for both parts of the assignment with the following contents : ·Name and student enrolment nos. of one or two candidates contributing to the submission; .Results from Part I of the assignment including a print-out of