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Vibration characteristics of slender structures under human induced loads

Thambiratnam, David P., Perera, Nimal, De Silva, Sandun S., & Huang, Ming-Hui (2010) Vibration characteristics of slender structures under human induced loads. In Codes in Structural Engineering, Developments and Needs for International Practice : Proceedings of the Joint IABSE-fib Conference, Cavtat, Dubrovnik-Neretva County, Croatia.

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Abstract

This paper presents the outcome of investigations and studies of the vibratioon characteristics and response of low frequency structural systems for a composite concrete steel floor plate and a reverse profiled cable tensioned foot bridge. These highly dynamic and slender structure are the engineering response to planning, aesthetic and environmental influences, but are prone to excessive and complex vibration. A number of design codes and practice guides provided information to engineers for vibration mitigation However, they are limited to very simple load function applied to a few uncoupled translational modes of excitation. Motivated by the need to address the knowledge gaps in this area, the investigations described in this paper focused on synchronous multi-modal and coupled excitation of the floor plate and footbridge with considerations for torsinal effects. The results showed the potential for adverse dynamic response from multi-modal and coupled excitation influenced by patterned loading, structure geometry, stiffness distribution, directional effects, forcing functions based on activity frequency and duration of foot contact, and modal participation. It was also shown that higher harmonics of the load frequency can excite higher modes in the composite floor structure. Such responsive behaviour is prevalent mainly in slender and lightweight construction and not in stiffer and heavier structural systems. The analytical techniques and methods used in these investigations can supplement the current limited code and best practice provisions for mitigating the impact of human induced vibrations in slender structural systems.

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ID Code: 41170
Item Type: Conference Paper
Keywords: Slender Structures, Vibration, Design Guidance, Multi-modal, Coupled, Human-induced Loads, Composite Floor Slab, Cable Supported Bridge
ISBN: 9789537621056
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Deposited On: 11 Apr 2011 10:49
Last Modified: 01 Mar 2012 00:33

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