Abstract

Info

Title:: Study on Slab Thickness of Profiled Steel Sheeting-concrete Composite Floors Based on Serviceability

Author(s):: QU Wen-jun; MO Li-biao; GUO Peng; Department of Structural Engineering, Tongji University

Keywords:: composite floor; natural frequency; peak acceleration; beam spacing; slab thickness

Abstract:: Numerical analysis on largespan profiled steel sheetingconcrete composite floor was carried to study the relationship of slab thickness, natural frequency and peak acceleration by finite element software ANSYS, and the suggested formula of slab thickness meeting the requirement of serviceability was given. The result shows that the peak acceleration calculated values according to the current code are underestimated, because the unfavorable factors of personslab coupling are ignored due to the simplification of pedestrian load. Thus, the multiorder harmonic excitation effect and the change of pedestrian position, as well as the interaction between human and floor should be taken into consideration in the humaninduced model. As the slab thickness rises, there is a critical value for getting the minimum frequency to balance the effect of stiffness and mass. Increasing the number of secondary beams on blind faith may not lead to a better result to solve the problem of serviceability, and changing the layout may be more efficient and economic than changing slab thickness. As the duration time of peak acceleration of slab is too short during single walking, taking weighted root mean square acceleration as evaluating indicator may be more suitable.