Method for designing pulling and pressing loading head in concrete multiaxial test

Abstract

The invention provides a method for designing a pulling and pressing loading head in a concrete multiaxial test, belongs to the technical field of concrete structure engineering tests, and particularly relates to the method for designing the pulling and pressing loading head in the concrete multiaxial test. A pulling loading head in the pulling and pressing loading head is combined by a bolt pull rod with a semicircular spherical hinge and a pulling loading plate with a concave type spherical hinge. A pressing loading head is of a design with a front variable cross section and a rear variable cross section. The front portion is the pressing loading head, and the rear portion is an electromagnetic attraction base. The pressing loading head is connected with the electromagnetic attraction base through an electromagnetic lock. According to the method for designing the pulling and pressing loading head, the pulling and pressing loading head can be conveniently and accurately adjusted to be centered, uniform stress is achieved, loading heads in two or three directions can be prevented from being mutually collided and intersected due to eccentricity and deflection of the pressing loading head in the loading process, and concrete multiaxial strength and deformation can be conveniently and accurately measured; and the method can be applied to the pulling and pressing loading head design in the concrete multiaxial test.

Description

technical field [0001] The invention belongs to the technical field of concrete structure engineering tests, in particular to a design method for a tension-compression loading head under concrete multiaxial tests. Background technique [0002] Common two-way slabs, folded slabs, shells, wall panels, shear walls and concrete-filled steel tube structures in concrete structural engineering, as well as some major special structures, such as nuclear reactor pressure vessels and containment vessels, dams, offshore platforms, and heavy hydraulic presses , equipment foundation, TV tower, etc. are typical two-dimensional or three-dimensional structures, and their concrete structures are in a state of obvious multiaxial stress. "GB50010-2011 Code for Design of Concrete Structures" gives the biaxial strength envelope diagram, triaxial compressive strength diagram and failure (strength) criterion applicable to any triaxial stress state of ordinary concrete, as well as uniaxial compressi...

AI Technical Summary

Problems solved by technology

Since concrete is a multi-phase material, its material properties are complex and changeable, and the multiaxial strength and deformation of concrete vary greatly with the state of multiaxial stress; it is difficult to find an accurate pure theoretical method that can be obtained from the raw materials of concrete Calculate its multi-axial mechanical properties based on original conditions such as properties, composition and preparation process

Images