| Reinforced concrete rigid frame arch bridges are developed from truss arch bridge and rigid frame bridges with inclined legs, and it is a high degree statically indeterminate thrust structure. It is widely used by bridges with a span of 25-70m as it has so many advantages such as less members, less weight, high integration property, high stiffness, convenient construction process, low price and beautiful form, etc.The classification, procedures and key points of load test are discussed reasonably in this paper considering the characteristics of this type of bridge. Then a real rigid frame arched bridge is applied as the engineering background, and the elastic-supported continuous beam method is applied to calculate its load transverse distribution, so the spatial problem is converted to a plane one, then the internal force and deformation of each section are calculated with a plane finite bar element program, in addition, the dynamic behavior and mode shape of the bridge is analyzed detailedly with dynamic FE technique. And in the mean time, the static and dynamic load test is put in practice, and the field test data is compared with the results of theoretic calculation, the results shows: the load transverse distribution calculated with the elastic-supported continuous beam method is quite accordant with the test results, and the frequencies calculated and tested are nearly the same. Based on the loading test, the actual bearing capacity, the existent deterioration and its cause of the bridge are analyzed and discussed, and several projects were compared both technically economically, then a detailed strengthening project is put forward.
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