Stiffness, Vibration, and Strength of Flat Slab and Flat Plate Lightweight Concrete Slabs
Main Article Content
Abstract
Flat slabs made of two-way reinforced concrete are a common, effective, and affordable structural method. Thin layer slabs and lightweight are of great importance in modern building construction without the need to increase the cross-section of columns, walls, and foundations. Consequently, it becomes more important to cover all aspects related to stiffness, vibration, and strength of lightweight concrete slabs. To achieve serviceable flat slabs from lightweight concrete (LWC), the comparison between LWC flat plate and flat slab is studied in this article for strength and stiffness. The construction of the flat plate is much easier than other slabs even though the problem facing the flat plate is the punching shear. Hence, the addition of the drop panel as a solution. However, the two LWC slabs are exposed to a uniform pressure of dead load and human live load. The vibration of the slab is related to the stiffness in the form of the natural frequency. These floor systems should satisfy walking excitation criteria of acceleration limit , which is equal to 0.50% of g for office occupancies. This study aims to analyze a flat plate and flat slab with a drop panel for strength and stiffness. The analysis is carried out in ABAQUS software. The results of the analysis show that the flat slab has an effective increase in strength of about 60% compared to the stiffness which was lower by about 2.2 %. However, the stiffness of both slabs is within the limits of walking excitation criteria.
Article Details
How to Cite
Publication Dates
Received
Accepted
Published Online First
References
ACI Committee 318. 2019. Building Code Requirements for Structural Concrete (ACI 318R-19), American Concrete Institute.
AISC, 1997. Floor Vibrations Due to Human Activity – Steel Design Guide Series No. 11. American Institute of Steel Construction, Chicago, IL
Al-Zahra, B.I.A., Alwash, M., Baiee, A. and Shubbar, A.A., 2021. Limitations on ACI code minimum thickness requirements for flat slab. Civil Engineering Journal, 7(11), pp.1918-1932. Doi:10.28991/cej-2021-03091769
Adam, M.A., Said, M., Arafa, A.E., Abdelsattar, A.M., 2020. Analytical analysis of Light-weight Concrete slabs under punching Load. Al-Azhar University Civil Engineering Research Magazine (CERM), 42(1), pp. 58-68
Adan, S.M., Luft, R. and Naguib, W.I., 2010. Deflection considerations in two-way reinforced concrete slab design. In Structures Congress, pp. 1991-2002. Doi:10.1061/41130(369)181 .
Ahmed, M.S., 2023. Natural frequencies of RC concrete slab with opening. Academic Journal of Nawroz University, 12(3), pp.158-164. Doi:10.25007/ajnu.v12n3a1905
Alami, F., Helmi, M. and Noorhidana, V.A., 2021, April. Fiber reinforced polymer as potential solution for vibration problem in concrete slab for supporting human comfortable. In IOP Conference Series: Earth and Environmental Science (Vol. 739, No. 1, p. 012025). IOP Publishing. Doi:10.1088/1755-1315/739/1/012025
Allahyari, H., Nikbin, I.M., Rahimi, S. and Allahyari, A., 2018. Experimental measurement of dynamic properties of composite slabs from frequency response. Measurement, 114, pp.150-161.Allen, D.E., Murray, T.M., 1993. Design Criterion for Vibrations due to Walking. Engineering Journal, AISC, 4th Quarter, 117-129. Doi:10.1016/j.measurement.2017.09.030
Bond, J., Hielmgren, V., 2018. Dynamic and Economic Aspects of Carbon Fiber Reinforced Polymer Footbridge. Master Thesis, Chalmers University of Technology, Gothenburg, Sweden.
Cao, T.A., Nguyen, M.T., Pham, T.H. and Nguyen, D.N., 2023. Experimental Study on Flexural Behavior of RC–UHPC Slabs with EPS Lightweight Concrete Core. Buildings, 13(6), p.1372. Doi:10.3390/buildings13061372 .
Fanella DA, Mota M. Design guide for vibrations of reinforced concrete floor systems: the first design guide developed to assist structural engineers with vibration analysis of reinforced concrete floor systems. Concrete Reinforcing Steel Institute; 2014.
Gharbi, A.H. and Mahmoud, A.S., 2020. Punching shear behavior of reinforced concrete slabs under fire using finite elements. Journal of Engineering, 26(5), pp. 106-127. Doi:10.31026/j.eng.2020.05.08
Al-Azzawi, A.A., 2019, August. Punching shear behaviour of solid and bubble reinforced light weight aggregate concrete two-way slabs. In IOP Conference Series: Materials Science and Engineering (Vol. 584, No. 1, p. 012013). IOP Publishing. Doi:10.1088/1757-899X/584/1/012013
Hussein, N.A., Salman, M.M., Jarallah, H.K., 2021. Analytical and Experimental Study of the Piles Cap Normal and Light Weight Aerated Concrete: Literature Review. Journal of Engineering. Baghdad, Iraq. 27(10), pp. 86-105. Doi:10.31026/j.eng.2021.10.06
ISO, 1989. Evaluation of Human Exposure to Whole-Body Vibration – Part 2: Human Exposure to Continuous and Shock-Induced Vibrations in Buildings (1 to 80 Hz), ISO 2631-2, International Standards Organization
Khanushiya, M.S., Butala, A.M., 2021. Comparative study of multistory building of flat slab and grid slab system with conventional slab system. International Research Journal of Engineering and Technology (IRJET), 8(5), pp.1-7
Khennane, A., 2013. Introduction to finite element analysis using MATLAB® and Abaqus. CRC Press. ISBN:1466580208, 9781466580206
Lai, E. and Mulas, M.G., 2016. Pedestrian-footbridge dynamic interaction: a probabilistic assessment of vibration serviceability. Meccanica dei materiali e delle Strutture, 6(1), pp.211-218.
Lee, R., 2023. ABAQUS for Engineers: Engineering Fatigue Analysis with Fe-Safe. South Korea.ISNN: 979-8379359331
Muhammed, T.A. and Karim, F.R., 2022. The Influence of Drop Panel's Dimensions on the Punching Shear Resistance in Ultra-High-Performance Fiber-Reinforced Concrete Flat Slabs. Construction, 2(1), pp.55-65. Doi:10.15282/cons.v2i1.7581
Munthe, A.T. and Jatmiko, G., 2020, May. Planning Parking Building Using Flat Slab And Drop Panel As A Replacement Conventional Beam With Analyzing Bending Moment Value & Sliding Style Based On SNI 1726-2012. In Journal of World Conference (JWC) (Vol. 2, No. 3, pp. 1-12).
Neville, A.M., 1995. Properties of concrete (Vol. 4, p. 1995). London: Longman, United Kingdom
Oukaili, N.K., Salman, T.S., 2014. Punching Shear Strength of Reinforced Concrete Flat Plates with Openings. Journal of Engineering, 20(1), pp. 1-20. Doi:10.31026/j.eng.2014.01.01
Park, R. and Gamble, W.L., 1999. Reinforced concrete slabs. John Wiley & Sons. ISBN:0471348503, 9780471348504
Paultre, P. and Moisan, C., 2002. Distribution of moments in reinforced concrete slabs with continuous drop panels. Canadian Journal of Civil Engineering, 29(1), pp.119-124. Doi: 10.1139/l01-076
Qi, J. and Yang, H.C., 2021. Improvement of a truss-reinforced, half-concrete slab floor system for construction sustainability. Sustainability, 13(7), p.3731. Doi: 10.3390/su13073731
Fernández Ruiz, M., Mirzaei, Y. and Muttoni, A., 2013. Post-punching behavior of flat slabs. ACI Structural Journal, 110, pp.801-812. Doi: 10.14359/51685833
Said, M., Adam, M.A., Arafa, A.E. and Moatasem, A., 2020. Improvement of punching shear strength of reinforced lightweight concrete flat slab using different strengthening techniques. Journal of Building Engineering, 32, p.101749. Doi: 10.1016/j.jobe.2020.101749
Salman, N.N., Daud, R.A., 2022. Finite Element Modeling of One-Way Recycled Aggregate Concrete Slabs Strengthened using Near-Surface Mounted CFRPs under Repeated Loading. Journal of Engineering. 28(11), pp. 32-46. Doi:10.31026/j.eng.2022.11.03
Singh, M. and Saini, B., 2019. Analytical and experimental study of voided slab. In Proceedings of the 1st International Conference on Sustainable Waste Management through Design: IC_SWMD 2018 1 (pp. 438-448). Springer International Publishing.
Htun, P.H.T., Phone, N. and Win, K.Z., 2018. Comparative study on analysis and design between flat slab and flat plate system for RC building. Int. J. Sci. Eng. Appl, 7(9), pp.313-317.
Urban, T., Gołdyn, M., Krawczyk, Ł. and Sowa, Ł., 2019. Experimental investigations on punching shear of lightweight aggregate concrete flat slabs. Engineering Structures, 197, p.109371. Doi:10.1016/j.engstruct.2019.109371
Xia, Q., Qu, W., Li, Y. and Zhao, J., 2018. Analysis of natural vibration frequency of different support slabs under the traffic vibration based on field measurement. Instrumentation, Mesures, Métrologies, 17(2). P. 219. Doi: 10.3166/I2M.17.219-233
Yang, K.H., Mun, J.H., Song, J.K., Kim, S.H., Hwang, S.H. and Chang, C.H., 2023. Punching shear capacity of lightweight aggregate concrete flat slabs without shear reinforcements. Magazine of Concrete Research, 75(6), pp.296-309. Doi:10.1680/jmacr.21.00324
Yasir, A., Effendi, M.K., Taveriyanto, A. and Apriyatno, H., 2019. Analysis of Strengths of Reinforced Concrete Beam Structures with CFRP Sheet Using Abaqus Software 6.14. Jurnal Teknik Sipil dan Perencanaan, 21(1), pp.9-19. Doi:10.15294/jtsp.v21i1.19364