Improving FE models of a long-span flat concrete floor using natural frequency measurements

El-Dardiry, Emad; Wahyuni, Endah; Ji, Tianjian; Ellis, Bryan

doi:10.1016/s0045-7949(02)00264-x

Cited by 18 publications

(10 citation statements)

References 2 publications

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“…In the development of the two flat plate models the following assumptions are used: The first assumption has been observed in several floor examples [5,16]. The second has been verified by the above comparison and the differences between the models are given in Table 4.…”

Section: Comparison Between 3d Composite Panel Model and Equivalent Pmentioning

confidence: 95%

“…Fig. 5 shows the first six mode shapes of the long-span concrete building floor [5]. It can be seen that the mode shapes of the floor are combinations of the simple mode shape of each floor panel.…”

Section: Isotropic Equivalent Flat Plate Modelmentioning

confidence: 99%

“…A floor-column model is directly used following the experience of modelling a multi-panel concrete floor [5,13]. The floor-column model considers the concrete slab, the steel sheets, the beams and the columns in the upper and lower storeys and linked to the floor.…”

Section: Modelling a Profiled Composite Floormentioning

confidence: 99%

“…The effect of columns in the dynamic behaviour of a multi-span concrete building floor was examined [5]. The columns were modelled as vertical pinned supports, fixed supports to the floor and actual columns using 3D beam elements.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of the dynamic behaviour of profiled composite floors

El-Dardiry

2006

Engineering Structures

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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.

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Section: Comparison Between 3d Composite Panel Model and Equivalent Pmentioning

confidence: 95%

Section: Isotropic Equivalent Flat Plate Modelmentioning

confidence: 99%

Section: Modelling a Profiled Composite Floormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling of the dynamic behaviour of profiled composite floors

El-Dardiry

2006

Engineering Structures

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“…Finite-element models The floor-column model was considered by El-Dardiry et al (2002) to be the most appropriate model to study the dynamic behaviour of long-span flat floors supported by columns, and a floor-column model was thus used in this investigation. The column was taken as 1·5 m long above and below floor level (approximately a half-storey height in a conventional building) and fixed boundary conditions were assumed at the two ends of the column.…”

Section: 2mentioning

confidence: 99%

Human-induced vibration of steel–concrete composite floors

Chen

Zhang

2018

Proceedings of the Institution of Civil Engineers - Structures

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Long-span composite floors have many desirable properties and have been increasingly employed in building construction. However, these long-span structures are prone to excessive and complex vibration under human rhythmic activities such as walking, running, jumping and aerobics, which may result in people's discomfort and complaints. A finite-element numerical study was conducted to investigate the vibration behaviour of profiled steel-deck composite floors under human walking and rhythmic activities. The results indicate that human-induced vibration of composite floors is influenced by several factors, namely the load model, the floor's natural frequency, effective weight and damping ratio. In a multi-unit floor system, higher modes may be excited and these vibration components should be considered. In addition, the vibration responses of both the active unit and adjacent passive units should be taken into consideration under human walking or rhythmic activities. In multi-floor buildings, the vibration of adjacent passive floors under rhythmic activities should be considered. The comfort index can be used to evaluate human perception to the vibration of composite floors. One important step in this procedure is to determine the peak accelerations of composite floors, which can be achieved based on the developed finite-element models.

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Correlation of dynamic characteristics of a super‐tall building from full‐scale measurements and numerical analysis with various finite element models

2004

Earthq Engng Struct Dyn

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SUMMARYThe Di Wang Tower located in Shenzhen has 79 storeys and is about 325 m high. Field measurements have been conducted to investigate the dynamic characteristics of the super-tall building. In parallel with the ÿeld measurements, seven ÿnite element models have been established to model the multi-outriggerbraced tall building and to analyse the e ects of various arrangements of outrigger belts and vertical bracings on the dynamic characteristics and responses of the Di Wang Tower under the design wind load and earthquake action. The distributions of shear forces in vertical structural components along the building height are also presented and discussed. The results from detailed modelling of group shear walls with several types of ÿnite elements are addressed and compared to investigate various modelling assumptions. Finally, the performance of the ÿnite element models is evaluated by correlating the natural frequencies and mode shapes from the numerical analysis with the ÿnite element models and the ÿeld measurements. The results generated from this study are expected to be of interest to professionals and researchers involved with the design of tall buildings.

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Improving FE models of a long-span flat concrete floor using natural frequency measurements

Cited by 18 publications

References 2 publications

Modelling of the dynamic behaviour of profiled composite floors

Modelling of the dynamic behaviour of profiled composite floors

Human-induced vibration of steel–concrete composite floors

Correlation of dynamic characteristics of a super‐tall building from full‐scale measurements and numerical analysis with various finite element models

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