ABSTRACT:Construction of the multiple lane bridges is increasingly growing in the recent years, specifically in the metropolitan cities to decrease the traffic volume and facilitate the road transportations. Steel-concrete composite bridge deck with steel sheeting is one of the deck slabs which showed some advantages over the conventional reinforced-concrete (RC) deck slabs. This study modelled and analysed these kinds of composite slabs comprising of steel sheeting and shear connectors which are filled by normal strength concrete. Finite element analysis (FEA) is applied for modelling and analysing in this research. The results were compared with the experimental test results which were tested earlier. The sample composite deck slabs were modelled and run for analysis by finite element software to obtain the ultimate load and related deflection of slabs under the vertical loading at the center of the deck slabs. The results indicated an acceptable correlation with the experimental test results. In addition, the results of FEA indicated that the horizontal shear resistance is larger by approximately 1.8 times than the required horizontal shear resistance which is in the acceptable range.

Concrete Filled Steel Tube (CFST) columns due to several benefits over the conventional composite columns are being more applicable in the constructions. The grade of composite connection between steel tube and concrete is one of the key factors in this structure. There are several experimental researches which were studied the composite action between steel tube and concrete and the different ways to increase the composition action; but few studies were performed numerical analysis for this matter. This study performed and used finite element (FE) to model and analyse a CFST column which was tested experimentally and attempted to verify the results for future evaluation. For this reason, different mesh sizes of 20mm, 25mm, 30mm and 40mm were analysed by using finite element software. The results were compared with the experimental test and indicated that the mesh size ES=20mm is a better match for this purpose and need to be considered for further analysis of this research.