Research On Reasonable Reinforcement Of Bonded Prestressed Reinforced Concrete Beam

With the rapid development of national economy,improve the load capacity of the strengthened of the vehicle,at the same time,the traffic has been a sharp rise,adding to the damage degree of the existing bridge.In addition,limited by science and technology level,the early construction of the bridge bearing capacity is low,most can’t meet the needs of the current traffic,time-consuming,and build a new bridge is not conducive to sustainable development.Using their damaged Bridges by means of strengthening technical innovation,improve its carrying capacity,can continue to play bridge bearing potential.A bond externally prestressed reinforcement is one of the most effective way to improve old bridge bearing capacity,has been widely used in bridge engineering.Adopt a unbond prestressed reinforcement of bridge structure,the relative pressure zone height coefficient and the reasonable reinforcement should be under effective control,to ensure the safety of structure,to ensure that the structure does not happen brittle failure,at the same time,the reinforcing materials used,saving of the prestressed steel usage.This article in the Ministry of Transport has bond externally prestressed reinforcement test based on the research topic,using the method of numerical simulation and theoretical analysis research after have a bond in vitro pre-stressed reinforcement concrete beams,the influence factors of the compression zone height limit coefficient and the change rule,analyzed the relative compressive zone height coefficient and beam damage,the relationship between reasonable reinforcement reinforcement beam analysis form.Through Ansys simulation analysis of the 10 test beams,studies have bond externally prestressed reinforcement beam prestressed level and the first phase of the load level on the compressive zone height limit coefficient.Studied the reinforcement beam reinforcement threshold value and the reasonable reinforcement.Results show that when an area the size of beam section of prestressed reinforcement ratio increased to 0.15%,the reinforced beam and brittle failure will happen.