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The Structural Engineer, Volume 63, Issue 14, 1985
Moment resistant steel beam-column connections using endplates and high strength friction grip bolts have been tested under both static and pulsating loads to determine their energy absorption characteristics. The effect of endplate thickness on damping capacity has been considered for a constant bolt diameter and member cross- section. Six specimens, two each made using 20 mm, 16 mm, and 12 mm thick endplates were tested-three under static loads and the other three under pulsating loads. An optical technique was used for the measurement of rotations of the beam and column. Loss of bolt tension under pulsating loads was also considered. The use of a flexible endplate capable of transferring the full plastic moment of the beam is recommended for these connections. A.K. Aggarwal and Professor R.C. Coates
This paper compares the efficiency of mode superposition and direct integration methods for the dynamic analysis of offshore platform cranes. Newmark’s method and the central difference method, which integrate the equatiom of motion directly, are compared with the method of mode superposition on the basis of computer time, computer storage, and program complexity. Progruming techniques to improve the efficiency of the different algorithms are described. Results are presented that show the central difference method to be uneconomic in comparison with the other two methods. The method of mode superposition, while requiring marginally more computer storage, is shown to offer substantial savings in computer time over Newmark’s method. J.A.D. Balfour