Model for simulating stress state of concrete and test method

Abstract

The invention discloses a model for simulating the stress state of concrete and a test method, and belongs to the field of concrete structure simulation tests. According to the model, corresponding stress distribution is generated on a wet joint interface of the model through a method of generating eccentric tension prestress through eccentric arrangement of prestressed twisted steel, a convex cross section is adopted so that pressure stress can be more easily concentrated on the top face of a web and tensile stress can be more easily concentrated on the bottom face of a flange plate, and therefore, a large-numerical-value tensile-compressive-stress ratio can be generated through a small-size model, and the tensile-compressive-stress states of various large bridges and buildings can be simulated. The stress distribution mode and the stress magnitude of the model section can be accurately controlled by adjusting the size of the model section, the prestress tensioning force and the position of the prestress twisted steel relative to the neutral axis section, and then the tension and compression stress state of the actual prefabricated assembled bridge wet joint construction stage issimulated. The model and the test method can be used for researching the rigidity, strength and stress mechanism of a precast concrete wet joint.

Description

technical field [0001] The invention belongs to the field of concrete structure simulation test, and more specifically relates to a model and test method for simulating the stress state of concrete, which can be used for the stress state test of precast concrete in the field of road, railway or bridge construction, and is especially suitable for the joints of prefabricated assembled bridges Stress state simulation test. Background technique [0002] In recent years, prefabricated assembled prestressed concrete bridges have been more and more widely used in domestic bridge construction. Segmental prefabricated and assembled prestressed concrete technology refers to dividing the bridge into several segments along the longitudinal direction. Each segment is pre-made and processed in the beam factory and maintained for a period of time, and then transported to the bridge construction site for assembly. The segments are connected by joints. And stretch the prestress to make it t...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a model and test method for simulating the stress state of concrete, the purpose of which is to generate eccentric tensile prestress through the eccentric arrangement of prestressed threaded steel bars, and adopt convex cross-section It makes it easier to concentrate the compressive stress on the top surface of the web, and the easier to concentrate the tensile stress on the bottom surface of the flange plate, so that a small-volume model can be used to generate a large value of tension-compression stress ratio, and simulate the tension and compression of various large bridges and buildings Stress state can be used for wet joint strength test, and can effectively evaluate the wet joint strength of prefabricated assembled bridge construction stage, thereby solving the technical problems that the existing test model is easy to be distorted and the mechanical characteristic response is inaccurate

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