Research On The Force Measurement Method For The Lateral Bearing Capacity Of Foundation Pile Of Anti-collision Structure

The anti-collision structure is the most important passive safety facility for road traffic.It plays an important role in protecting the safety of vehicle occupants and reducing property losses.The pile-soil interaction between the post and the soil determines the lateral resistance of the pile foundation.Testing the lateral resistance of the pile foundation is the only way to improve road traffic safety.However,the pile-soil interaction relationship between the post and the soil is extremely complicated,which makes the current detection of the lateral resistance of the pile foundation of the collision structure only the destructive collision test method,and large-scale lateral resistance detection of the pile foundation cannot be carried out.Therefore,in situ non-destructive testing,which only uses the characteristic parameters of detecting small deformations,can map the characteristic parameters of elastoplastic large deformations with large displacements and large rotations during a catastrophic collision.It is a solution to achieve large-scale testing.This article focuses on the study of the impact of the inertia effect of the bogie on the impact of a catastrophic collision.The test results cannot reflect the true lateral resistance of the pile foundation.A method for measuring the lateral resistance of the pile foundation of the crash structure is proposed.Obtain accurate characteristic parameters during a catastrophic collision in a crash test.First of all,it analyzes in detail the external reflection of the inertia effects in the car crash test in the test results,and explained the problem of what the inertia effect is in the car collision problem through numerical theoretical analysis,and put forward the theory of inertia effect in the car collision problem.Then,according to the proposed theory of inertia effect,indirect measurement of the acceleration at the center of mass of the bogie will bring about the problem of inertia effect.Innovatively proposed a bogie force measurement method for the lateral resistance of pile foundations,and innovatively proposed the simultaneous measurement of force and displacement.In addition,a bogie impact head compatible with the test method was developed,and a dynamic simulation test was used to measure the force that is always perpendicular to the post.Because the designed impact head is deformed,the entire head area containing the force sensor will become a partial mass-spring-damping system.Therefore,the bogie force measurement method one scheme has been improved,and the elimination is proposed.The influence of the inertia effect on the bogie force measurement method.In addition,a design method for the head of the bogie is proposed in order to accurately design the size of the impact head for different bogie tests,and make the measured force not only remain perpendicular to the post,but also measure the same point on the post.The dynamic simulation test shows that the proposed design method of the force measuring part structure of the bogie can make the test results reflect the true lateral resistance of the pile foundation.Finally,through dynamic simulation analysis,the influence of different acceleration sensor installation positions on the test results in the bogie crash test is further studied,and suggestions are made.