Exoperimental Stydt On Seismic Behavior Of High-strength Reinforced Concrete E Short Columns With Expanded Mmetl Lath

At the same time,the construction technology in the engineering field also advanced by leaps and bounds.Various new building materials also appeared constantly,and various super high-rise buildings were unearthed.From the beginning,the use of high-strength concrete is also more common.Therefore,the shortcomings of high-strength concrete such as large brittleness and poor ductility have become the primary problems that many scholars need to solve.In addition,with the increase of the number of building layers and the limitation of the axial compression ratio of the bottom column,the cross-sectional size of the reinforced concrete column is getting larger and larger,so it is easy to form a short column,which seriously affects the seismic performance of the building.After studying the formation and failure characteristics of reinforced concrete short columns and analyzing the advantages and disadvantages of various concrete reinforcement measures,this paper proposes a new measure to strengthen the reinforced concrete short columns.In order to study the seismic performance of high strength reinforced concrete short columns strengthened by steel mesh,related experiments were designed.The reinforcement effect of the steel mesh method was demonstrated by experimental data analysis.The main contents of the paper are as follows:Through four sections with dimensions of200mm×200mm,axial compression ratio of 0.4,and actual shear span ratio of 2,the steel mesh reinforcement form is divided into inner and outer reinforced concrete short column test pieces for low-cycle repeated loading test.The failure mode,hysteresis characteristics,skeleton curve,energy consumption capacity and performance degradation of each test piece were studied.The results show that the high-strength reinforced concrete short column in the form of steel mesh reinforcement has ductility and significantly improves the energy consumption of the test piece;while the test piece in the inner reinforcement form causes the concrete inside and outside the steel mesh in the reinforcement area to be separated due to the steel mesh,so that the test piece There is no significant improvement in seismic performance:(1)Through four sections with dimensions of 200 mm × 200 mm,axial compression ratio of 0.4,and actual shear span ratio of 2,the steel mesh reinforcement form is divided into inner and outer reinforced concrete short columntest pieces for low-cycle repeated loading test.The failure mode,hysteresis characteristics,skeleton curve,energy consumption capacity and performance degradation of each test piece were studied.(2)The numerical simulation software was used to establish a model for the four test pieces to carry out finite element analysis.The test data was compared with the simulation results to verify the accuracy of the finite element analysis software and provide a scientific basis for future expansion experiments.Through analysis,it is found that the steel mesh reinforcement and reinforcement method can effectively improve the ductility and energy dissipation capacity of the specimen,and slow down the stiffness degradation and strength degradation of the specimen;however,the seismic performance of the specimen with the inner reinforcement method is not significantly improved.