Research On The Height Coefficient Of The Compression Zone Of Concrete Beams Strengthened By Increasing The Section Method

Increasing the cross-section in the compression zone and increasing reinforcement in the tension zone are two methods for load-bearing reinforcement of concrete bridges.Under the premise of no brittle failure,the height coefficient of the compression zone by increasing the section in the compression zone method is mainly affected by the height of the increased section and the first stage load,while the height coefficient of the compression zone by increasing the reinforcement in the tension zone method is mainly affected by the number of reinforcement and the first stage load.At present,the reinforcement method in the current "Design Specification for Highway Bridge Reinforcement" does not consider the secondary force of the reinforced beam with load reinforcement.This article derives the calculation method for the height coefficient of reinforced beams by increasing the section method through theoretical analysis under the condition of secondary loading of loaded reinforcement.It focuses on analyzing the variation law of the height coefficient of reinforced beams by increasing the section in the compression zone affected by two factors: the first stage load and the height of the reinforced section,as well as the variation law of the height coefficient of reinforced beams by increasing the reinforcement in the tension zone affected by two factors: the number of newly added reinforcement bars and the first stage load.Simulate and calculate the reinforced beams with increased cross-section in the compression zone and reinforced beams with added reinforcement in the tension zone using ANSYS Workbench,analyze the variation law of height coefficient,and validate the proposed calculation method.The results show that the height coefficient of the reinforced beam decreases with the increase of the first stage load in the compression zone,and increases with the increase of the reinforcement height.The height coefficient of the reinforced beam decreases with the increase of the first stage load in the tension zone,and increases with the increase of the reinforcement steel.