An Experimental Method for Studying the Effect of Stress Gradient on the Creep Behavior of Concrete Beams

Abstract

The invention discloses a test method for researching the influence of stress gradient on the creep property of concrete beam. The method comprises the following steps: firstly producing a concrete beam component comprising a single-direction axial-load component and a bending component, reserving a pore for a prestressed tendon on a plastic corrugated pipe the specification of which is greater than the diameter of a steel beam by one grade, and enabling the prestressed tendon to pass through the pore; placing the single-direction axial-load component on the smooth ground, supporting two ends of the bending component by adopting supporting articles, installing an anchoring steel plate on each of the prestressed tendons stretching out of two ends of the two components, and installing a pressure sensor between the anchoring steel plate on one end and the component; installing a dial indicator on the bending component, reading an initial value of the dial indicator, measuring the distance between stressed measuring points of the single-direction axial-load component and the bending component by holding the dial indicator, and obtaining the initial value of the distance between the dial indicator and the stress measuring point; additionally stretch-drawing the prestressed tendon if the numerical value of the pressure sensor is more than 2% less than the initial value of the tension force. The method has the beneficial effects that the method is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and relates to a test method for studying the influence of stress gradient on the creep performance of concrete beams. Background technique [0002] Under the long-term action of constant load, the phenomenon that the deformation of concrete increases continuously with time is called creep of concrete. The effect of concrete creep on the long-term performance of bridges is serious. In the past ten years, my country's transportation industry has developed rapidly, the speed of vehicles has continued to increase, and the mileage of expressways and railways in alpine or frozen areas has continued to increase. Vehicles running at high speed require more precise smoothness of the bridge deck or track, and the complex use environment also requires good durability of the bridge structure. Therefore, it has become an urgent problem to be solved in bridge engineering to reasonably pre-control t...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a test method for the influence of stress gradient on the creep performance of concrete beams, which solves the problem that the current test method of stress gradient on the creep of concrete beams is complicated and expensive

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