The Analysis Of Tensile Failure Modes Of Lifting Points Of Concrete Embedded Anchor Based On Peridynamic

The proliferation of prefabricated buildings has led to a surge in demand for precast concrete components.With the development of modern buildings,lightweight concrete precast members have been rapidly developed.But the lightweight concrete precast member production,the hoisting process cannot leave the embedded anchor.At present,there are various types of embedded anchor in engineering application,and the ways of force transmission and force characteristics are also different.The tensile load is one of the main loads.It is neither feasible nor necessary to study all the failure modes of the lifting points under the tensile load.Therefore,after sorting out the traditional numerical analysis methods of concrete,it is necessary to study the final failure mode of tension at the lifting point based on the method of peridynamics.The main research work of this paper is as follows:According to the stress characteristics,the embedded anchor can be divided into bottom expanding type,steel welding type and other flat steel type.Considering the applicability and the preliminary test,this paper focuses on the study of the failure mode under the action of the tensile load on the lifting point of the embedded anchor of the combined anchor and bolt with enlarged bottom.The research status and relevant numerical analysis methods of embedded lifting parts are introduced.Finite element analysis software was used to simulate the drawing tests of two embedded anchors with different embedded depths in the preliminary experimental study.With the help of the finite element analysis software of ABAQUS,two models of units-100 and units-130 were established for two types of specimens with embedded depth of 100mm and 130mm.Final results show that the two models in the lifting point occurred cone of concrete damage,destroy the Angle 45°,Angle is greater than the previous test values and norms.Peridynamics(PD)method was used to simulate the concrete at the lifting point.Approximation for PMB to lightweight aggregate concrete,to simulate the material lifting point cone damage occurs,the cone Angle is equal to about 35°,and the preliminary test value exists difference,and close to the《Technical specification》and《ACI318》specification values.In order to verify the simulation results,pull tests were carried out on two sets of specimens with the embedded depth of 100mm and 130mm to analyze the failure patterns and causes of embedded specimens in lightweight aggregate concrete.The results show that all the embedded anchor are damaged by cone in lightweight aggregate concrete.Compared with the test team early made relatively consistent results,the cone Angle between 22° and 23°,and the norms of ideal cone damage both at home and abroad compared Angle on the low side,peridynamics simulation method is more close to the result.The innovation of this paper is that most of the researches on the failure modes of the lifting points of the embedded anchor adopt the experimental method,and even the numerical method is mostly the traditional finite element method for simulation.In this paper,the peridynamics method is applied to the study on the failure modes of the lifting points.At the same time,PMB material parameters of lightweight aggregate concrete are deduced according to the results of concrete simulation by PMB material model.Compared with the results of the traditional finite element method,the model is more close to the test value and the standard value.