Research On Seismic Performance Of Beams Reinforced With High-performance Composite Mortar Reinforcement Mesh

With the rapid development of China's construction industry,China has accumulated a large number of old buildings,which are in urgent need of repair and reinforcement to ensure their normal use,compared with the new buildings that are constantly rising,and now people are paying more and more attention to the seismic performance and durability of houses.These factors have contributed to the emergence of a number of building reinforcement methods.The high-performance composite mortar reinforcement mesh reinforcement method has a smaller increase in cross-section,the reinforcement method is more flexible,and has good high temperature resistance and durability,so it has been continuously researched and promoted in recent years.However,at present,most of the domestic and foreign research on the reinforcement method of high-performance composite mortar reinforcement meshes around the reinforcement of columns and the shear resistance of beams using this method,and the research on the seismic performance of beams using this method of reinforcement Relatively few,in order to further understand the seismic performance of reinforced concrete beams reinforced with high-performance composite mortar reinforcement mesh,this paper uses the method of combining test and finite element to develop the seismic performance of reinforced concrete beams and beam-column joints,and has achieved the following Research results:(1)Using the combination of test and finite element method,the failure mode and seismic performance of the reinforced specimen under the two methods of low-cycle reciprocating load under anchoring and bending anchoring were carried out.The research reveals that no matter whether the method of using anchorage or bending anchorage,the seismic performance of the reinforced specimen under low-cycle reciprocating load has been significantly improved,and the cloud diagram can be found that the anchorage specimen is brittle failure,due to the strengthening of the node Insufficient,the concrete in the core area of the node fails before other parts,and the reinforcing steel in the node area has not yet yielded;because the bending and anchoring test piece reinforces the node through the reinforcement mesh mortar layer,the final failure mode is essentially a beam.End bending failure.(2)Using the finite element model modified by the experiment,the research on the seismic performance of the reinforced beam was carried out by the anchoring parameters of the rebar.The results of the study revealed that the smaller the distance between the longitudinal reinforcement of the reinforced mesh and the concrete in the core area of the node,the earlier the failure of the reinforced specimen;The changes in the depth of the ribs and the distance between the stirrups of the steel mesh have little effect on the failure mode of the component;the appropriate ranges of these parameters are also determined in the article.(3)The finite element analysis method was used to study the seismic performance of the reinforced beams with the bending anchoring parameters.The results of the study revealed that for the bending and anchoring specimens,the reduction of the longitudinal reinforcement of the reinforced layer will cause the failure mode to change,but the increase of the spacing will cause the shear capacity to decrease;The thickness of the layer is increased;the change of the spacing of the steel mesh stirrups has little effect on its seismic performance.