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Dynamic Behaviour and Catenary Action of Axially-restrained Steel Beam Under Impact Loading
In this paper, the dynamic behaviour and catenary action of axially restrained steel beam under impact loadings is examined through a combination of experimental and numerical investigations. It describes and discusses the results of six impact tests on the axially restrained welded H-beams by means of the drop hammer test machine. The main behavioural patterns and the key response characteristics including the development of impact force, deformation and strain, as well as failure modes are examined, with emphasis on the effect of impact energy and the width to thickness ratio of beam flange. Finite element models are also developed and validated against the available testing results. It is demonstrated that the detailed FE model can capture the response of the welded H-beams under impact loadings. Moreover, the mechanism of catenary action was identified based on the development of the internal force in the welded H-beams
Theoretical prediction on the shear capacities of shear connectors in steel column bases
Shear connectors are extensively used in steel column bases of steel structures to transfer loading from superstructure to concrete foundations, however the behavior and shear capacity of the steel shear connector subject to complex external loading are not well understood. This paper presents an approach for theoretically predicting the shear capacities as well as behavior of the shear connector in steel column bases subject to external loading such as both shear force and bending moment at the top. The load-displacement behavior at the top of the shear connector and the internal force distribution along the depth of the connector are also investigated at various states with different cases of boundary conditions. Two states of concrete compressive strain, i.e. the critical and ultimate states, are considered for evaluating the critical and ultimate shear capacities of the shear connector. The theoretical predictions for the behavior and load capacities of the shear connector are then compared with finite element results. The results from the verification study show that the proposed approach can provide satisfactory theoretical predictions for the behavior of the shear connecto