The out-of-plane buckling of a circular arch is studied. The arch is composed of two main ribs braced with transverse bars and is subjected to uniformly distributed radial forces (see Fig. 1). The analysis is carried out by means of transfer matrix method and both the field matrix of arched rod and point matrix are presented. Attention is given to the influences of the flexural rigidity, the number and the location of bracing bars on the buckling strength of arches. Buckling coefficients for various types of arch are calculated by trial and error method. Useful suggestions about the bracing method are obtained from the results of computations. The theoretical analysis is followed by model tests in order to verify the results of computation.
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