Study On Fatigue Performance Of Simply Supported Prestressed Reactive Powered Concrete Beam

Reactive Powder Concrete is a new ce ment-based materials with high strength?high toughness and high durability. Researchers at home and abroad have done a lot of studies for its application in the field of civil engineer ing since 1990 s, and most of them are concentrated on the static performance. However, so me common areas of civil engineering, such as crane beams? offshore platforms? highway bridges and railway bridges, etc, are inevitably faced with the effects of fatigue loads. The fatigue loads can cause the perfor mance degradation of structural materials constantly. Finally, brittle failure occurs in the case of the lower static strength. Therefore, in order to promote the application of the RPC material, it is very important to understand the fatigue properties of prestresse d RPC structure. In this paper, through the experime n tal research of prestressed RPC bea ms under stati c loading and fatigue loading to study the performance degradation process. The contents of the paper can be listed as follows:1. Describe the background of this topic and summarize the research progress and the basic conclusions at home and abroad. Based on the existing problems, the objective of this paper are put forward.2. Through the experiments of RPC and reinforced bar, static and fatigue test of prestressed RPC beams, the failure process of the test specimen under static loading and the effects of loading ti mes on crack ?deformation?compression zone RPC strain and reinforce ment strain have been observed.3. Through static load bearing capacity after 2 slices of model beam fatigue test, the fatigue characteristics of prestressed RPC beam static load after load is analyzed, revealing prestressed RPC beam fatigue load after the evolution law of residual static load bearing capacity.4.According to the test results of the prestressed RPC beams, presenting the assumption of nonlinear analysis of prestressed RPC beams. On the base of this, the simplified method of prestressed RPC beams is deduced. The data is performed by the simplified method accord with the theory data.