Ambient Vibration Response of Precast Hollow Core Flooring System
Rahimi M.I.1, Abd Ghafar N.H.2, Mohd Jaini Z.3, Ibrahim Z.4
1Muhammad Imran Rahimi, Graduate Research Assistant, Department of Structural & Material Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Batu Pahat, Malaysia.
2Nor Hayati Abd Ghafar*, Senior Researcherr, Department of Civil Engineering, Faculty of Civil Engineering & Buil Environment, Universiti Tun Hussein Onn Malaysia, Batu Pahat, Malaysia.
3Zainorizuan Mohd Jaini, Researcherr, Department of Civil Engineering, Faculty of Civil Engineering & Buil Environment, Universiti Tun Hussein Onn Malaysia, Batu Pahat, Malaysia.
4Zainah Ibrahim, Associate Professor, Department of Civil Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.
Manuscript received on January 26, 2020. | Revised Manuscript received on February 05, 2020. | Manuscript published on February 30, 2020. | PP: 2363-2367 | Volume-9 Issue-3, February 2020. | Retrieval Number: C5747029320/2020©BEIESP | DOI: 10.35940/ijeat.C5747.029320
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Prestressed precast hollow core is known as a long span slab with a void along its length. The void has a big influence on the weight of the slab. In vibration theory, a lightweight slab with a long span is very sensitive to vibration. In this study, the ambient vibration response of precast hollow core is investigated using the finite element method and modal analysis. Numerical analysis is used to predict the floor vibration and modal testing is used to test the vibration performance of floors on the actual site. The prediction data is obtained by using SAP2000 to determine the vibration behaviour and compared with the modal testing result of the floor located in Kuala Lumpur. The 1st mode shape appeared for 12 natural frequencies between 8.36 Hz to 9.29Hz in the prediction analysis. For modal testing, the vibration behaviour of the actual hollow core floor is determined using an ambient test. The data was obtained using an accelerometer and analysed using Artermis software to determine natural frequencies, damping ratio and mode shape. The 1st mode of natural frequencies for floor area A and area B were 8.45Hz and 9.34Hz. The results from the analysis show that the range of natural frequency between the predicted analysis and that of the modal testing is acceptable. The limitation stated that 10Hz is the cut-off frequency to determine the class of the floor. From the analysis, it is shown that the prediction and the modal testing results are accepted where both floors are classified as low-frequency floors.
Keywords: Hollow core floor, vibration, modal testing, ambient vibration, prediction analysis, floor serviceability, low frequency floor