An impact test device and test method for pre-applied axial force and bending moment

Abstract

The invention discloses a test piece fixing device for preloading axial force and bending moment for impact experiments and an experimental method thereof. The fixing device includes a rigid base, a sliding end load applying component, a fixed end load applying component, a pendulum, a test There are 7 parts, including parts, data acquisition system and computer terminal. The key technical point is that the loading head driven by the pneumatic device is embedded in the toothed track that can flexibly adjust the eccentricity to compress the test piece, so as to realize various initial axial forces and bending moments. combination of conditions; during the impact test, the instantaneous impact force causes the specimen to deform laterally and cause axial contraction, the piston of the pneumatic device is elongated, and the gradually weakening axial force and bending moment are continuously applied until the component fails, accurately simulating the internal force during the collapse of the structure The actual evolution law; at the same time, the data acquisition system records the load, displacement changes and the evolution of the specimen configuration in real time, providing data support for evaluating the collapse resistance of the specimen and establishing an accurate mechanical analysis model. The overall structure of the invention is simple and compact, and the experimental operation is simple.

Description

technical field [0001] The invention belongs to a test piece fixing and preloading device for experiments and an experimental method thereof, in particular to a test piece fixing device for preloading axial force and bending moment in cooperation with an impact test and an experimental method thereof. Background technique [0002] With the progress of society and the increasingly severe anti-terrorism situation, people have higher requirements for the safety design of large public buildings and protective structures. Since the last century, scholars from various countries have strengthened the mechanical analysis and experimental research of structural components under impact loads, which has promoted the tremendous development of materials and energy absorbing devices, and has been widely used in the fields of automobiles, aerospace and military industries. As the main load-bearing and side-resistance components of building structures, the failure of columns under strong dy...

AI Technical Summary

Problems solved by technology

However, in view of the complexity of the problem, traditional experimental methods are only suitable for simple loading and boundary conditions, such as only considering fixed or simply supported boundaries, or only considering the influence of the initial axial force on the structural response, while ignoring the axial force in the overall Declining effects of the deformation process and bending moment effects that have a strong influence on the structural response

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