| At present,with the rapid development of China's construction industry,in the ongoing construction of new buildings at the same time,the existing structure of the reinforcement and transformation also attracted wide attention.The reinforced concrete columns are the most important force and reinforcement components in engineering,increasing section reinforcement method and clad steel reinforcement method are the two most commonly used reinforcement methods.According to the two kinds of single reinforcement methods are applied to actual structure limitation in reinforcement project,proposed the use of self-compacting concrete and encased steel of the new composite reinforcement method,namely through part of cast-in-place self compacting concrete will angle?through the steel plate connected to each other?and the original component closely.So that the two parts are able to work together to improve the rigidity of components and bearing capacity,the subject through theoretical analysis,experimental research and finite element simulation of reinforced concrete columns under influence of eccentricity,steel ratio and batten spacing and other factors,the method of reinforced concrete column performance by the eccentric under compression damage characteristics,and puts forward some suggestions and practical calculation method of reinforcement column design of new angle steel.The main contents of this article include the following points:?1?Experimental research of columns used to carry out new composite reinforced concrete eccentric compression bearing capacity.Design of 25 eccentric compression column specimens,including two original contrast concrete columns,considering the eccentricity,angle type,batten spacing and other parameters of the 11 small eccentric composite reinforcement column and 12 large eccentric composite reinforcement column.Through the failure test of the column,the test phenomena and failure characteristics of the column specimen were observed,and the bearing capacity and the load-strain curve of the column were analyzed,explore the eccentricity?batten spacing?angle type and dosage of reinforcement effect on the bearing capacity of column compression.?2?According to the k Nowledge of concrete structure reinforcement,with reference to the method of increasing the cross section method and the clad steel reinforcement method,based on the test data and the results,Analysis of a new type of angle steel stress mechanism of strengthening reinforced concrete columns,steel according to the simplified model and considering the effect of restraint stress on the strength of concrete,using the constitutive relationship of confined concrete Mander model,calculation formula of compressive for derived constrained concrete.And introduction of angle steel with steel coefficient?jg,batten plate hoop coefficient?t,according to the regression analysis of the experimental data,the relationship between?jg,?tand angle strength coefficient?ais established.and the new formula for calculating the bearing capacity of eccentrically loaded reinforced concrete columns strengthened with angle steel is put forward.?3?The use of finite element analysis software ANSYS reinforced concrete for new outsourcing angle steel reinforcement eccentric compression column modeling analysis,By analyzing the deformation,stress and strain output of the reinforced column under the finite element simulation,the failure process of the component is discussed with the experimental phenomenon,and compared with the theoretical value and the experimental value,the simulation effect is satisfactory.?4?On the basis of summing up the research results,the article puts forward the problems existing in this research,such as the second force is not considered in the course of the experiment,the thick Ness of the concrete bond layer is considered single,and so on. |
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