Simon Schnabl

Buckling of Slender Concrete-Filled Steel Tubes with Compliant Interfaces

THIS PAPER PRESENTS AN EXACT MODEL FOR STUDYING THE GLOBAL BUCK-LING OF CONCRETE-FILLED STEEL TUBULAR (CFST) COLUMNS WITH COMPLI-ANT INTERFACES BETWEEN THE CONCRETE CORE AND STEEL TUBE. THIS MOD-EL IS THEN USED TO EVALUATE EXACT CRITICAL BUCKLING LOADS AND MODES OF CFST COLUMNS. THE RESULTS PROVE THAT INTERFACE COMPLIANCE CAN CONSIDERABLY REDUCE THE CRITICAL BUCKLING LOADS OF CFST COLUMNS. A GOOD AGREEMENT BETWEEN ANALYTICAL AND EXPERIMENTAL BUCKLING LOADS IS OBTAINED IF AT LEAST ONE AMONG LONGITUDINAL AND RADIAL INTERFACIAL STIFFNESSES IS HIGH. THE PARAMETRIC STUDY REVEALS THAT BUCKLING LOADS OF CFST COLUMNS ARE VERY MUCH AFFECTED BY THE INTERFACIAL STIFFNESS AND BOUNDARY CONDITIONS.

Buckling Loads of Two-Layer Composite Columns with Interlayer Slip and Stochastic Material Properties

This paper presents an efficient stochastic buckling model for studying the structural reliability of layered composite columns with interlayer slip between the layers and random material and loading parameters. The model is based on the exact buckling model, response surface method, and Monte Carlo simulations. The probability of failure is investigated for a different number of random variables, sample points, and various degrees of response surfaces. The results show that the probability of failure is considerably affected by the type (deterministic or probabilistic) of the loading and its distribution.

Three-dimensional bimetallic layered beams with interface compliance: Analytical solution

This paper focuses on the development of a new mathematical model and its analytical solution for the analysis of the mechanical behavior of geometrically and materially linear three-dimensional two-layer bimetallic beams with interface compliance. Consequently, the analytical solution of bending of elastic three-dimensional two-layer composite beams with interface compliance is derived for the first time. In the illustrative example, a three-dimensional two-layer cantilever composite beam made of 6061-T6 aluminum and C83400 red brass is analyzed. It is shown that interface compliance could have a significant influence on the mechanical behavior of such a structure. Finally, the results for different mechanical quantities are tabulated and as such the analytical solution presented can be used as a benchmark solution of three-dimensional bimetallic composite beams.