Spatial loading system and method suitable for flexural-torsional instability

Abstract

The invention discloses a spatial loading system and method suitable for flexural-torsional instability. The loading system comprises a to-be-loaded test piece, a counter-force frame, an electro-hydraulic servo actuator, a spherical hinge end head, a connecting clamp plate and a bidirectional follow-up device; the counter-force frame consists of a gantry counter-force frame and supporting seats attwo ends of the test piece; the to-be-loaded test piece is horizontally arranged in the gantry counter-force frame; two ends of the to-be-loaded test piece are connected with the supporting seats according to experimental requirements; the mid-span point of the to-be-loaded test piece is connected with the electro-hydraulic servo actuator through the connecting clamp plate and the spherical hingeend head; and one end of the electro-hydraulic servo actuator is connected with the counter-force frame through the bidirectional follow-up device. According to the spatial loading system and methodof the invention, the self-balancing of a force during test loading is realized through the gantry counter-force frame and the supporting seats; and with the connecting clamp plate adopted, it can beensured the effect of the force can be transmitted to the to-be-loaded test piece; and the translational movement and torsion of the electro-hydraulic servo actuator during spatial loading can be realized through the bidirectional follow-up device and the spherical hinge end head, and at the same time, it can be ensured that the loading direction of the electro-hydraulic servo actuator is verticaldownwards. The spatial loading system and method have the advantages of high accuracy, high stability and small interference.

Description

technical field [0001] The invention relates to a space loading system and method suitable for bending and torsional instability, belonging to the field of civil engineering structure tests. Background technique [0002] Beams and arches in buildings and bridge structures are flexural members in use, and the bending moment is often caused by the load on them. This load is generated from various gravity loads such as the structure's own weight, snow load, and other loads. For the research and experiment of gravity load, the current research on this kind of load generally stops at the overall instability of the component. The loading method is mostly to use the jack to directly provide the vertical downward load. This kind of experiment has the following disadvantages: [0003] (1) The contact surface between the jack and the component will generate a large friction force, which will prevent the component from in-plane or out-of-plane torsion after the overall instability; ...

AI Technical Summary

Problems solved by technology

[0004] (2) After the overall instability occurs, the force provided by the jack will no longer be vertically downward. At this time, it will accelerate the instability of the component and no longer meet the actual situation;

[0005] (3) The component still has a part of the bearing capacity after the overall instability, and this part will not be considered in this experiment

[0008] (1) A large space is required in the lower part of the specimen, which will make the entire test process be carried out at a higher place, which will bring greater difficulty to the experiment;

[0009] (2) The load provided is relatively fixed and can be loaded step by step, but it cannot make the loading process smooth and continuous

[0010] The above shortcomings can easily lead to inaccurate experimental results

Images