University of Bath

Bath, Somerset, United Kingdom

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Department of Biology and Biochemistry
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Department of Mechanical Engineering
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Faculty of Management

Publication History View all

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    Tetrahedron 10/2014;
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    ABSTRACT: In timber structures, the connections are generally flexible in comparison to the members they connect, and so contribute significantly to the dynamic properties of the structure. It is shown here that a widely-used form of connection, the dowel-type connection, exhibits nonlinear stiffness and energy dissipation, even at pre-yield loads, and that this nonlinearity affects the modal properties of structures with such connections. This study investigates that behaviour by modal analysis of a portal frame and a cantilever beam constructed from timber with steel dowel connections. The observed nonlinearity is explained qualitatively by considering the measured force–displacement response of individual connectors under cyclic load, which show a reduction in stiffness and an increase in energy dissipation with increasing amplitude of vibration. The structures were tested by modal analysis under slow sine sweep and pseudo-random excitation. Under pseudo-random excitation, a linear single degree-of-freedom curve fit was applied to estimate the equivalent linear modal properties for a given amplitude of applied force. Under slow sine sweep excitation, the frequency response function for the structures was observed to show features similar to a system with a cubic component of stiffness, and the modal properties of the structures were extracted using the equation of motion of such a system. The consequences for structural design and testing are that two key design parameters, natural frequency and damping, vary depending on the magnitude of vibration, and that parameters measured during in-situ testing of structures may be inaccurate for substantially different loads.
    Engineering Structures 10/2014; 76:235-244.
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    ABSTRACT: The area of photocrystallography and time resolved crystallography is reviewed, and the methods for determining the three-dimensional crystal structures of metastable and transient species using synchrotron X-ray radiation is described.
    Coordination Chemistry Reviews 10/2014;


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    Claverton Down, BA2 7AY, Bath, Somerset, United Kingdom
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Top publications last week by downloads

Journal of sport & exercise psychology 03/2007; 29(1):39-59.

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