Roller type low friction vertical loading system with tracking function

Abstract

The invention relates to a roller type low friction vertical loading system with a tracking function. The roller type low friction vertical loading system comprises a beam, two pulling rods, a hydraulic jack, an actuator, two lower hinging seats. The roller type low friction vertical loading system is characterized in that two upper hinging seats which are respectively hinged to upper ends of thepulling rods are arranged above the beam; each of the two lower hinging seat includes a guide block and a first pin shaft; the lower ends of the two pulling rods are hinged to the first pin shafts ofthe corresponding lower hinging seats; roller mounting brackets are arranged on upper and lower ends of the guiding blocks and two sides of the first pin shafts; a group of rolling shafts are arrangedin each roller mounting bracket; two guide bottom seats are provided; the lower hinging seats are arranged in space between two pressing beams and a bottom beam; the two groups of rollers on an upperpart contact lower ends of the two pressing beams; the two groups of rollers on a lower part contact an upper end of the bottom beam. In the system, when a test component pulls the beam to horizontally shift under the action of a horizontal load, the bottom ends of the pulling rods can follow up the tops of the pulling rods, so that the pulling rods are basically vertical during the test.

Description

technical field [0001] The invention belongs to the field of civil engineering and relates to test technology, in particular to a roller-type low-friction vertical loading system with a tracking function. Background technique [0002] At present, when carrying out loading experiments on walls, beams and columns, most structural laboratories basically use two loading devices: one is vertically fixed by connecting the top beam to the base through a tie rod, and the upper end of the tie rod is connected to the beam by bolts. The lower end of the tie rod is mostly connected to the hinged support and the ear plate. The base is usually directly connected to the rigid ground anchor bolt of the laboratory. The hydraulic jack is placed between the beam and the test member, and the jack reaction force is applied to the beam. Load the test member. Under this device, when the test member is subjected to the applied horizontal load to generate horizontal displacement, a displacement dif...

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Problems solved by technology

Under this device, when the test member is subjected to the applied horizontal load to generate horizontal displacement, a displacement difference will often occur between the test device and the test member, causing the vertically fixed tie rod to tilt, and the internal tension of the tie rod produces a horizontal component, which affects the test results. However, although the existing test device reduces the load sudden change caused by the rigid connection through the hinge support, it does not have an effective function to reduce the horizontal component of the tension force in the tie rod during the test because the lower end of the tie rod is fixed. The effect of vertical load changes

The other is the vertical loading device of the reaction frame. The reaction frame is composed of a beam and columns on both sides, and is fixed on the rigid ground of the laboratory. The hydraulic jack is placed between the beam and the test member, and the test member is horizontally loaded to produce horizontal displacement When the test component and the hydraulic jack often produce a displacement difference, resulting in a sudden change in the vertical load, in order to reduce this effect, the method of placing a roller workbench under the hydraulic jack is usually used. However, when the test component is made, the jack The surface cannot reach the ideal flat state, and the roller table cannot play a role of complete buffering during the loading process

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