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A cantilever riverside boardwalk has been opened to the public as shown in Figure 2; however, it was found that the structure experiences significant human- and traffic-induced vibrations. A harmonic oscillation test found the natural frequency of the structure to be 2.25 Hz. It is proposed to retro-fit braced struts at 5m spacing so that the natural period of vibration will be 9 Hz given E = 200 kN/mm² and ignoring buckling effects, what area of strut is required? 1 m Ans. 67.5 mm² A B 4 m 100 kg/m² 4 m PROPOSED STRUT PIN Figure 2

A cantilever riverside boardwalk has been opened to the public as shown in Figure 2; however, it was found that the structure experiences significant human- and traffic-induced vibrations. A harmonic oscillation test found the natural frequency of the structure to be 2.25 Hz. It is proposed to retro-fit braced struts at 5m spacing so that the natural period of vibration will be 9 Hz given E = 200 kN/mm² and ignoring buckling effects, what area of strut is required? 1 m Ans. 67.5 mm² A B 4 m 100 kg/m² 4 m PROPOSED STRUT PIN Figure 2

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A cantilever riverside boardwalk has been opened to the public as shown in Figure 2; however, it was found that the structure experiences significant human- and traffic-induced vibrations. A harmonic oscillation test found the natural frequency of the structure to be 2.25 Hz. It is proposed to retro-fit braced struts at 5m spacing so that the natural period of vibration will be 9 Hz given E = 200 kN/mm² and ignoring buckling effects, what area of strut is required? 1 m Ans. 67.5 mm² A B 4 m 100 kg/m² 4 m PROPOSED STRUT PIN Figure 2
Transcribed Image Text:A cantilever riverside boardwalk has been opened to the public as shown in Figure 2; however, it was found that the structure experiences significant human- and traffic-induced vibrations. A harmonic oscillation test found the natural frequency of the structure to be 2.25 Hz. It is proposed to retro-fit braced struts at 5m spacing so that the natural period of vibration will be 9 Hz given E = 200 kN/mm² and ignoring buckling effects, what area of strut is required? 1 m Ans. 67.5 mm² A B 4 m 100 kg/m² 4 m PROPOSED STRUT PIN Figure 2
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