Experimental Study On Reversible C-shaped Shell's Lateral Resistance And Compressive Properties After Large Deformation

The tape spring is a new type of recoverable structure similar to C-shaped steel tape.Because of its advantages of extensible,self-restoring,stability,energy-saving,reusable and so on,as a new space deployable structure,it has been widely applied in aerospace field.The tape spring can be restored by its own driving force,which is very consistent with the research hot spot in recent years—the functional structure of recoverable function.This study introduces the recoverable C-shaped shell structure into the field of civil engineering,and proposes a new fast reset structure system.After the large earthquake,the structure can be reset quickly by using the "tape effect" of the C shell by the jack and other devices.In this paper,the basic mechanical properties of the recoverable C-shaped shell which can be applied to civil engineering are studied through experimental exploration and numerical simulation.The main works are as follows:(1)Through the exploration of the rolling process and heat treatment process of the recoverable C shell,two sets of technological processes for making the shell of the civil engineering are summarized.The quenching process and the control of the tempering temperature are the key processes for the recovery of the C-shaped shell.Then the geometric appearance of the C-shaped shell and the mechanical properties of the material made of the above two processes are evaluated.The C-shaped shell,prepared by the above two methods,both achieved the recover-ability.(2)Through the orthogonal test design of 4 factors and 3 levels,9 groups of lateral bearing test for the strong and weak axis of the restoring C-shaped shell were carried out.The deformation mode of the C-shaped shell under the action of lateral force was studied.The cross-section "open" and the deformation of the cross-sectional curvaturebecome smaller,and the C-shaped shell remains purely elastic during multiple loads,and the recover-ability is good.In addition,the effect of various geometrical factors of the C-shaped shell on the lateral mechanical properties of the C-shaped shell was studied by using range analysis.(3)The axial compression test of the C-shaped shell specimen after large lateral deformation was carried out,and the C shell still had a high bearing capacity.The load-displacement curve analysis showed that the C-shaped shell under axial pressure was converted from each other in different modes.The specimens could still recover without plastic deformation after unloading.The influence law and the significant degree of the buckling load of the C-shaped shell after the lateral large deformation were obtained by using range analysis and variance analysis.The influence of each factor was as follows: Central angle ? ThickNess ? Height ? Radius.Furthermore,the formula of the axial pressure of the C-shaped shell was refitted,and the formula for the axial compression buckling load of the recoverable C shell after the lateral large deformation was obtained.(4)The ABAQUS finite element software was used to simulate the lateral and axial compressive properties of the recoverable C-shaped shell respectively.The original geometric defects of the specimen were simulated by introducing the same modality as the experimental deformation,and the actual boundary conditions and the initial loading eccentricity were introduced into the model.The test results were basically consistent with the simulation results,verifying the finite element's real reliability.