Three-Dimensional FE Modelling of Simply-Supported and Continuous Composite Steel-Concrete Beams

AbstractComposite steel-concrete beams represent an economic form of construction used in both building and bridge applications. The composite action is usually provided by the presence of shear connectors welded to the top of the steel joist and embedded in the concrete slab. The flexural response is strongly dependent on the rigidity provided by these connectors. Initial studies in this area highlighted that their deformability needs to be evaluated and included in the modeling for an accurate structural representation. For this purpose, different types of push-out tests have been proposed to date to describe the load-slip relationships of shear connectors. These relationships are usually used in numerical simulations when modeling experimental tests or performing parametric studies. In this context, the finite element model proposed in this paper intends to provide a representation of the composite behaviour of floor beams without the need to rely on constitutive relationships obtained from push-out tests. The model is validated against experimental results available in the open literature carried out using simply-supported and continuous static configurations and based on composite beams with solid and composite slabs

Probabilistic three-dimensional finite element study on composite beams with steel trapezoidal decking

This paper presents a probabilistic study based on Monte Carlo simulation (MCS) to evaluate the influence of material uncertainties on the numerically simulated structural response of composite steel-concrete floors consisting of concrete slabs cast on steel profiled sheeting and connected to steel beams by means of shear connectors. The numerical analyses are performed using a three-dimensional finite element model developed using the commercial software Abaqus, implemented using an explicit formulation. The constitutive behaviour of all materials is nonlinear. Contact regions between the concrete and steel elements are simulated using surface-to-surface and embedment techniques. Analyses are carried out for three case studies including simply-supported and continuous beams for which experimental results are available in the literature. Different realization sizes are considered for the MCS in order to evaluate their influence on the statistical characterization of the structural response. Based on the obtained results, it is observed that the adopted realization sizes provide similar statistical representation of the structural behaviour, which highlights how even a reduced number of nonlinear analyses can lead to satisfactory approximations of the statistical description of the response uncertainties in composite steel-concrete floors

A probabilistic three-dimensional finite element study on simply-supported composite floor beams

Composite steel-concrete beams are commonly used as flooring in buildings. The composite action between slab and steel joist is typically provided by shear connectors welded to the top of the steel joist and embedded in the concrete. This paper investigates the effects of material uncertainties on the numerically simulated structural response of simply-supported beam tests reported in the literature by means of Monte Carlo simulation (MCS). The numerical analyses are performed using a three-dimensional finite element model developed using the commercial software Abaqus and capable of predicting the response of composite steel-concrete members as well as the influence of the shear connectors without having to rely on shear connection load-slip curves obtained from push-out tests. All materials are assumed to behave in a nonlinear fashion. Contact regions between the concrete and steel elements are simulated using surface-to-surface and embedment techniques. The statistical information on the structural response obtained from MCS using different realisation sizes is compared and discussed. For the particular case studies considered in this paper it can be concluded that even a reduced number of realisations can already provide meaningful statistical representations of the structural response of the considered composite floor beams

Proceedings of 2017 Modular and Offsite Construction Summit & the 2nd International Symposium on Industrialized Construction Technology

Off-site construction involves the process of designing, fabricating, transporting and installing building elements for rapid site assembly to a greater degree of finish than in other types of on-site construction methods. However, some pieces of the building depending on the geometry, materials and weight can be produced using 3D printing on-site. Energy consumption can be modified based on the available resources on construction site such as labours, factories, and materials. This study focuses on energy optimisation based on simulating site available resources when 3D printing technology is available. The paper compares three proposed different cases including balconies are entirely concrete, balcony Containers are replaced with soil and a shade factor was applied as well as case 2 with the added effect of evapotranspiration

Assessment of energy release mechanisms contributing to coal burst

Coal burst is a dynamic release of energy within the rock (or coal) mass leading to high velocity expulsion of the broken/failed material into mine openings. This phenomenon has been recognised as one of the most catastrophic failures associated with the coal mining industry, which can often lead to injuries and fatalities of miners as well as significant production losses. This paper aims to examine the mechanisms contributing to coal burst occurrence, with an emphasis on the energy release concept. In this study, a numerical modelling study has been conducted to evaluate the roles and contributions of difference energy components. The energy analysis presented in this paper can help to improve the understanding of energy release mechanisms especially under Australian conditions

Proceedings of the Eighth International Conference on Deep and High Stress Mining

Coalburst is referred to as the violent failure of overstressed coal, which has been recognised as one of the most critical dynamic failures in coal mines. This paper aims to analytically and numerically evaluate the energy transformation between the different strata and coal layers. An accurate closed-form solution is developed. Due to the complexity of the causes and mechanisms contributing to the coalburst occurrence, 3D finite element modelling was developed to validate the suggested analytical assessments of rock/coalburst occurrence. The energy concept is emphasised in order to improve the understanding of the underlying mechanisms of coalburst. Only with enhanced understanding of the driving mechanisms, a reliable coalburst risk assessment can be achieved

Proceedings of the 2020 Coal Operators Conference

Rock bolts and cable bolts are usually considered to experience static loads under relatively low-stress conditions. However, in burst-prone conditions, support elements are subjected to dynamic loading. Therefore, it is important to understand cable bolt behaviour under dynamic loading conditions, particularly their energy absorption capacity. Rock bolts and cable bolts as well as steel mesh are widely used as permanent support elements in tunnelling, underground excavations and surface slope stability. This paper aims to determine the amount of the dissipated energy which can be taken into account to design combined yielding supports when subjected to dynamic loading. A ground support approach is suggested for underground excavations undertaking a range of mining-induced coal burst. A bench mark based on the largest expected impact loading is considered to conclude the level of coal burst risk and select an appropriate approach, whether quasi-static or dynamic, for the mine support