Simply-supported beam pre-stress loss detection method

Abstract

In order to solve the problem that it is not easy to realize long-term on-line monitoring by use of the simply-supported beam pre-stress loss detection method in the prior art and pre-stress loss is judged by use of a single method, the invention provides a simply-supported beam pre-stress loss detection method. According to the method, the pre-stress loss is evaluated based on the dynamic characteristic and static characteristic of a simply-supported beam structure, namely, the equivalent stiffness value of a simply-supported beam structure is acquired according to the real-time acceleration information of a pre-stressed simply-supported beam, and the residual pre-stress value of the pre-stressed simply-supported beam is acquired according to the deflection change value and equivalent stiffness value of the pre-stressed simply-supported beam. The beneficial effects are as follows: the method starts from the overall performance of the structure of a pre-stressed simply-supported beam, the pre-stress loss of components is detected and evaluated based on the dynamic and static characteristics, and monitoring information is fully utilized; and long-term on-line monitoring is realized, and the accuracy of the test result is improved effectively.

Description

[0001] field of invention [0002] The invention relates to a prestress loss evaluation technology of a prestressed simply supported beam, in particular to a method for detecting the prestress loss of a simply supported beam. Background technique [0003] After the rapid development in recent decades, my country's transportation construction has been greatly improved, and the road grades, bridge structures and functions have all tended to be perfect; after high-speed development, the core of my country's transportation industry will be vigorously constructed, and will be reinforced and maintained. development in maintenance. In my country's current bridge construction, prestressing technology has gradually been widely used. Prestressed girder bridge is a relatively new bridge technology in recent decades. Its main principle is to pre-apply a stress inside the main girder, so that the girder bridge will cause an upward deflection of the anti-arch. Such an anti-arch will resist...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the prestress loss detection method of simply supported beams in the prior art that it is not easy to realize long-term on-line monitoring, use a single method to judge the amount of prestress loss, and make the test results less accurate, etc., the present invention proposes a simply supported beam Detection method of beam prestress loss

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