Analysis Of Reinforcing Concretes Beam's Fatigue Performance Impact

The transportation rapid development is playing the more and more vital role in the national economy high speed development which has brought the huge challenge for the existing bridge.The repeate load causes each kind of bridge structure to appear many kinds of plant diseases,like the bridge appears the big distortion and the crack in the normal enlistment period, even endangers influence to the bridge safety performance.The domestic and foreign investigation and study thought reinforced concrete beam and the pre-stressed concrete beam fatigue failure is one of structure main destruction forms.This article makes the Ministry of Communications science and technology project the earlier period research work of"Great Span Pre-stressed concrete Beam bridge deflection Reason Analysis And Countermeasure Project"the topic three"the great span prestressed concrete beam bridge moves the load repeatedly the function effect research".Through investigates and analyzes the domestic and foreign reinforced concrete and the pre-stressed concrete beam fatigue performance obtains many conclusions.1)This article summarized the influence concretes fatigue performance primary factor and the analysis concrete structure under redundant load function fatigue failure pattern.The scholar thought that the minimum stress level is quite sensitive under the redundant load function to the concretes resistant to compression weary performance shade, its value increases along with the minimum stress level increases.2)This article introduced that the reinforced concrete weary performance in the domestic and foreign research condition, and analysis the different scholar to calculate the light round Steel bar and deformed reinforc bar fatigue strength S-N curve characteristic.They thought that the reinforced concrete beam's crack opening increases along with load multiplicity N increases.3)This article diagnosis prestressed concrete beam right section anti-curved fatigue performance and Induces the redundant load to the component fatigue failure shape.Through analysis contrast this article discovered that the pre-stressed muscle's stress increases along with multiplicity N increases.This article discovered that the PPR influence is quite sensitive to the amount of deflection and component's crack opening increases under the redundant load function along with multiplicity N increases.