EXPERIMENTAL RESEARCH ON ULTIMATE BEARING CAPACITY OF A COMPOSITE ARCH RING CONSIDERING SECONDARY STRESS

Junxin Wang,∗ Weicheng Wang,∗ Feixiong Yang,∗∗ and Lei Chen∗∗∗

Keywords

Masonry arch bridge, bearing capacity, initial stress, secondarystress, composite arch ring

Abstract

In this study, experimental research on the ultimate bearing capacity of a reinforced concrete composite arch ring was carried out. Considering the influence of the initial stress, the thickness of the reinforcement layer, the eccentricity of the load before reinforcement, the material performance, bearing capacity, failure mode, and loadstrain relationship were analysed. The test results showed that the bearing capacity of the reinforced structure decreased with the increase of the initial stress, but there was not a proportional relationship between them. They were affected by the synergistic force and material nonlinearity between the old and the new structures. When the reinforced layer was located on the side of the smaller compression, the increase of the thickness of the reinforced layer contributed to the ultimate bearing capacity of the structure. Moreover, the increase of the eccentricity made the bearing capacity of the reinforced structure decrease rapidly. In addition, bar planting and chipping before reinforcement could effectively enhance the integrity of the composite section. Therefore, it could be considered that the deformation of the composite section after reinforcement met the assumption of a flat section.

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