N. E. Shanmugam

Behaviour of composite plate girders with partial interaction

AbstractThis paper is concerned with the behaviour and strength of composite plate girders in which, the interaction between the steel plate girder and concrete slab is partial. Based on curvature compatibility principle, an approximate method is proposed from which, the shear capacity and deflection at any given load may be determined. The tension field action developed in web panels at the post-buckling stage is incorporated in the solutions. From the results obtained by using the proposed method, it is found that the flexural stiffness and failure load drop with decrease in degree of interaction. Comparisons are made between the results obtained through the proposed method and the corresponding ones from finite element analysis. A satisfactory correlation between the results in terms of behaviour and strength establishes the accuracy of the proposed method.

An approximate method for the ultimate shear strength of horizontally curved composite plate girders

AbstractThe paper is concerned with the ultimate load capacity of horizontally curved composite plate girders. An approximate method to predict the ultimate shear strength of the girders is presented. The proposed method accounts for the tension field action in web panels, composite action between steel plate girder and reinforced concrete slab with full interaction and presence of web openings. The accuracy of the method is assessed by comparing the predicted values of ultimate shear strength with the corresponding results obtained by using the nonlinear finite element analyses through a computer package LUSAS. The comparisons show that the proposed method is capable of predicting the ultimate shear strength with an acceptable accuracy. Presence of web openings of different proportions and their effects on ultimate strength of the girders are examined. Girders with trapezoidally corrugated webs are also considered in the study.

Analysis of connections in composite construction under cyclic loading

Composite construction is commonly adopted in major projects now. Large size columns, beams and slabs are made compositely and connected together. Such connections in the past did not take advantage of composite behavior and designed as steel connections. Modern codes make provisions for design and construction of connections compositely. It is, therefore, essential to understand the behavior of such composite connections. This paper is concerned with beam to column composite connection subjected to cyclic loading. Results obtained from the finite element analysis of composite joints tested by other researchers are presented. The beam-to-column connections comprise of end plate welded to the beam and bolted to column flange. Analysis are carried out by finite element analysis through a computer code LUSAS. The connections are modeled with a mesh established as efficient and effective in terms of analysis time and accuracy of the results by a convergence study. The results are presented in the form of moment-rotation curves and the numerical results compared with the corresponding experimental values.

Effects of partial interaction on the behaviour of composite plate girders

This paper is concerned with a series of tests on steel-concrete composite plate girders with partial shear connection. Eight simply supported girders of practical size were tested to failure in order to examine the responses under shear load applied at the mid-span. Effects of different shear connection properties and concrete grades on the ultimate strength and behaviour of the girders are the main focus of the study. Variations of strength, mode of failure and load-deflection behaviour have been observed. The ultimate load capacity was found to drop significantly and the behaviour has changing from brittle-like to ductile mode as the degree of interaction reduced.

Primary and secondary reinforcements in reinforced concrete corbels

AbstractThe study is concerned with normal-strength concrete corbels. 30 such corbels were studied by finite element modelling and the variables considered include ratios of primary and secondary reinforcement, type of applied loading, vertical or horizontal. Finite element modelling with a software package LUSAS was used to analyse four series of corbels namely PV series (primary reinforcement with vertical loading), SV series (secondary reinforcement with vertical loading), PH series (primary reinforcement with horizontal loading) and SH series (secondary reinforcement with horizontal loading). The results indicate that corbels with neither primary reinforcement nor secondary reinforcement fail suddenly. In the case of PV series and SV series, corbels increase in ratio of primary and secondary reinforcement generally resulted in enhancement of strength and ductility when subjected to only vertical loading. This increase is significant up to 0.4% in the case of primary reinforcement and 0.3% in the case ...

Secondary Reinforcement in Concrete Corbel

This paper is concerned with finite element analysis of corbels. Analyses were carried out on 254 × 405 × 254-mm reinforced concrete corbels. In this study 24 reinforced concrete corbels were considered. Variables considered in this investigation are: number, position, and different arrangement of secondary reinforcement. The results show that arrangement of the secondary reinforcement affects both strength and ductility of corbels.