The paper presents the wavelet-based discretization of the linearized finite-strain beam theory of an arbitrary initial geometry. The strain vector is the only unknown function in the finite element. The classical polynomial interpolation is compared to scaling and wavelet function interpolations. The computational efficiency of the method is demonstrated by analyzing initially curved and twisted beams.
COBISS.SI-ID: 4432993
This paper presents the equations for the implementation of rotational quaternions in the geometrically exact three-dimensional beam theory. A new finite-element formulation is proposed in which the rotational quaternions are used for parametrization of rotations. Several numerical examples demonstrate the validity, performance and accuracy of the proposed approach.
COBISS.SI-ID: 4800353
This paper shows the behaviour of timber composite beams with interlayer slip, when simultaneously exposed to static loading and fire. A transient moisture-thermal state in a timber beam and mechanical behaviour are considered. The thermal model is validated against the experimental data presented in the literature.
COBISS.SI-ID: 4598369
A mathematical model for slip-buckling has been proposed and its analytical solution has been found for the analysis of layered composite columns with inter-layer slip between the layers. The analytical study has been carried out for evaluating exact critical forces and comparing them to those in the literature. Particular emphasis has been given to the influence of interface compliance on decreasing the bifurcation loads.
COBISS.SI-ID: 4572769
This paper presents the comparison between ultrasonic wave transmission (USWT) method and ultrasonic wave reflection (USWR) method in their ability to monitor the setting process of cement pastes. The relationship between the velocity of longitudinal waves and shear wave reflection coefficient can be simplified into three characteristic phases and the end of the first phase can be used to define the beginning of the setting process of cement paste.
COBISS.SI-ID: 4685921