The Transport and Road Research Laboratory is conducting research to improve the present methods of assessing the traffic load capacity of masonry arch bridges. This includes a series of load tests to collapse on redundant bridges. This report describes a supplement to these tests, the construction and testing of a full scale 4m span semicircular masonry arch bridge in the laboratory. The advantages of this approach are that the structure can be precisely specified and more comprehensive instrumentation can be used. The construction, instrumentation and testing of the bridge are described. A failure load of about 1050kN was obtained and the test demonstrated the ability of the arch ring to distribute the applied load and the contribution of the fill and the spandrel walls to the strength of the structure. (A)

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