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Vibration behaviour of Malaysian rubberwood lvl-concrete composite floor system

Lee, Yen Fong (2015) Vibration behaviour of Malaysian rubberwood lvl-concrete composite floor system. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

In Malaysia, the use of laminated veneer lumber (LVL) and timber concrete composite (TCC) are extremely uncommon compared to European country. One of the advantages of LVL is high bending strength among the engineering timber due to the parallel laminated veneer. Thus it replaced the timber as joist in TCC to produce higher strength of flooring system and name as LVL-concrete composite (LCC). But due to the light-weight of LCC in long span, it might highly susceptible to vibration by service load. Therefore the main objective of this research is to study the vibration behavior of Malaysian LCC in various parameters such as concrete topping thickness, span length and stiffness connector; and full scale flooring system by using SAP 2000 finite element modeling. The SAP 2000 software and model were verified through Abd Ghafar's (2008) experiment results and analytical in order to produce accurate modeling. The properties results of LVL Rubberwood from testing are dramatically higher than its origin Rubberwood properties with bending strength of 36.29 N/mm2 and modulus of elasticity of 14327 N/mm2. The performance of LVL Rubberwood is increase by at least 26.8% to maximum 89.73% based on properties comparison of Rubberwood. The 150mm rectangular notch with 10mm diameter screw connector is the best connection by produced a maximum strength of 54.75 kN from experiment. The properties of LVL Rubberwood and stiffness connector were inserted in the SAP 2000 to predict the natural frequency and mode shapes of the flooring system that can be trusted. The flooring system has to exceed 8 Hz of fundamental natural frequency and arms is less than 0.45 m/s2 which are stated by most of the standard and researchers. Finally, the design of 10 meters LCC span length with 600 x 400 mm concrete topping and 400 x 90 mm LVL joist satisfied the requirement of short term verification of the serviceability and ultimate limit state; and within the vibration limitation. The FE model's result for both parameters was close to the analytical result which is 99.46%. Among parameters, the one that most affected natural frequency is span length. It is because the natural frequency depends on two system properties, mass and stiffness.

Item Type: Thesis (Masters)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA630-695 Structural engineering (General)
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 11 Apr 2017 00:55
Last Modified: 11 Apr 2017 00:55
URI: http://eprints.uthm.edu.my/id/eprint/9027
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