The Structural Engineer > Archive > Volume 77 (1999) > Issues > Issue 11 > The Effect of Geometry on the Natural Vibrations of Masonry Arch Rings
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The Effect of Geometry on the Natural Vibrations of Masonry Arch Rings

In the UK, there is an urgent current need to assess the serviceability of many masonry arch bridges as a result of imminent increases in permitted heavy vehicle axle weights within the EU. Vibration techniques, along with some others, can be used to assess the integrity of these structures. The arch ring, as the fundamental loadbearing component of these structures, is of particular interest. Insufficient attention has been paid in the past to the measurement and categorisation of the diferent types of modes of vibration of these structures and the ordering of their successive natural frequencies. This paper investigates the vibration behaviour of segmental arch rings of a range of realistic proportions and the corresponding variations of modal shapes and frequencies. Good comparisons are obtained in some key cases between the results from the modern finite element (FE) method and older previous work. The eflect of variations in the proportions of the arch ring on the natural frequencies is shown graphically, and there is discussion about the corresponding mode shapes. A.J. Pretlove and J.C.A. Ellick

Author(s): Pretlove, A J;Ellick, J C A

Keywords: masonry;arch rings;arch bridges;analysis;appraising;natrual frequency;vibration;research;comparing;finite element methods;axle loads