Modelling of the dynamic behaviour of profiled composite floors

Abstract

The paper develops an isotropic and an orthotropic flat plate models for predicting simply and reasonably accurately the dynamic behaviour of composite floors. Based on the observation that the mode shapes of a multi-panel floor are different and complicated but the mode shape of each panel is either concave or convex, the two equivalent flat plate models are developed using the equivalence of the maximum displacement of a sophisticated 3D composite panel model. Thin shell elements are used to model the steel sheet and 3D-solid elements to represent the concrete slab. Parametric studies are conducted to examine the effects of boundary condition, loading condition, shear modulus and steel sheet on the equivalent models. The two simplified flat plate models are then applied to studying the dynamic behaviour of a full-scale multi-panel profiled composite floor (45.0 m × 21.0 m) in the Cardington eight-storey steel framed building. The predicted and measured natural frequencies are reasonably close. The modelling process becomes easier and significant time saving is achieved when either of the two simplified models is used. It is found from the study that the variation of floor thickness due to construction can significantly affect the accuracy of the prediction and the locations of neutral axes of beams and slabs are not sensitive to the prediction providing that they are considered in the analysis.

Dynamic response of low frequency Profiled Steel Sheet Dry Board with Concrete infill (PSSDBC) floor system under human walking load

“…Sandun de Silva and Thambiratnam [10], da Silve et al [8], da Silve et al [9], El-Dardiry and Ji [13], Williams and Waldron [37], Chen [6] determined dynamic responses of composite floors under human activities to assess their vibration serviceability. Ellingwood and Tallin [14] mathematically studied the dynamic response of floors under a pragmatic model instead of the pedestrian dynamic load.…”

Human Comfort Assessment of Steel‐concrete Composite Floors

“…Countless authors have developed studies on floor vibrations when subjected to human activities. The influence of steel deck concrete slabs numerical modelling was investigated on the dynamic structural behaviour of an eight floors steel building, with each floor measuring 45m x 21m [6]. In this study, different modelling strategies were developed based on the use of isotropic and orthotropic systems and the dynamic response of these models were evaluated based on comparisons between the structure natural frequency values obtained by numerical modelling and experimental tests.…”

Investigation on structural behavior of an innovative orthogonal-diagonal steel open-web sandwich floor system

“…Steel-deck composite floor is increasingly used in high-rise buildings (De Silva and Thambiratnam, 2009). Some study on the behavior of steel-deck composite floors has been conducted by Da Silva et al (2003), El-Dardiry and Ji (2005) and Behnia et al (2013). The finite element (FE) methods were used to investigate the structural behavior of composite floors subjected to human-induced activities.…”