Research On Anchorage Performance Of GFRP Connectors After Imitated Seismic Damage

With the advent of building industrialization and housing industrialization,building energy efficiency is the only way for sustainable building development.Building energy efficiency technology is also a symbol of a country’s architectural level.For the design of building exterior walls,traditional design methods can no longer meet the requirements of building energy efficiency,we must explore new types of prefabricated thermal insulation wall panels.Therefore,the application of prefabricated sandwich insulation exterior wall panels was born,which meets the requirements of building energy saving.Fiberglass connectors are currently the mainstream sandwich insulation wallboard connectors on the market.Research of domestic and foreign scholars on glass fiber connectors is mainly on the anchoring performance and thermal performance under normal use conditions.Research on the anchoring performance of glass fiber connectors for wall panels after earthquake damage is very scarce.The problem of whether the external wall panels after earthquake damage can still be used normally needs to be solved.In order to solve the above problems,this paper studies the anchoring performance of the glass fiber connector in the outer leaf concrete slab of the sandwich insulation wall panel after imitating earthquake damage.The main research work and conclusions are as follows:（1）A series of expositions were made on the current research and application status of FRP bars,the bonding performance of FRP bars and concrete,and the current research status of sandwich insulation wall panel connectors.Through reading related literature,it was found that there was no research on the bonding and anchoring performance of GFRP connectors and concrete after earthquake damage,which leads to the research purpose,method and content of this article.（2）In order to compare the bonding performance of GFRP connectors and concrete after imitating earthquake damage,this paper made 6 groups of undamaged GFRP bar concrete specimens to study the anchoring performance of GFRP connectors.The damage mode of the test piece in the pull-out test is mainly the pull-out damage of the connector,and the concrete interface is conical damage.Combined with the theoretical calculation formula of the bond strength of the GFRP bar in the concrete in the ACI specification,given the suggested values of correction coefficients.For threaded and Y-shaped GFRP connectors,the suggested values of K are 19 and 18.（3）GFRP reinforced concrete specimens were made on the quake-damaged sandwich insulation external wall panels to study the anchoring performance of GFRP connectors after seismic damage.The damage modes of the specimens in the pull-out test are mainly concrete pull-out splitting damage,concrete middle layer fracture damage and conical damage of the bonding surface.Substituted the anchor strength value obtained from the test into the ACI specification and given the suggested value of the correction coefficient after the seismic damage.For threaded GFRP connectors,conservatively take K₁ as 13（area with more severe damage）,K₂ as 18（area with less damage）,and K₃ as 24（basically undamaged area）;for Y-shaped GFRP connectors,conservatively take K₁ as 13,K₂ as 15,K₃ as 18.Compared this test with the pull-out test of the undamaged specimen,it was found that the GFRP connector can still maintain good anchoring performance after the seismic damage,and the anchoring strength is sufficient to ensure the safety of the external wall panel.（4）Used the ABAQUS finite element analysis software,numerically simulate the GFRP bar concrete specimens after the seismic damage.Compared test results with numerical simulation results.The simulated value of anchoring strength is basically consistent with the test value,which can more accurately reflect the true force process of the bond and slip between the GFRP connector and the concrete.（5）Finally,summarized the research content and main results of this article,which laid the foundation for in-depth research on the anchoring performance of GFRP connectors after imitating earthquake damage in the future,and also made a fundamental contribution to the better promotion of sandwich insulation wall panels.Figure:[61]table:[13]reference:[55]...