FRP (fiber reinforced plastic) tendon-bundle hybrid sling structure with warning function

Abstract

The invention discloses an FRP (fiber reinforced plastic) tendon-bundle hybrid sling structure with a warning function. The FRP tendon-bundle hybrid sling structure comprises peripheral FRP tendons, an inner steel bundle and composite clamp anchors. The composite clamp anchors are used for anchoring the peripheral FRP tendons and the inner steel bundle one by one through clamp anchors; the inner steel bundle is disposed in the centers of the composite clamp anchors; the peripheral FRP tendons are evenly anchored on the periphery. While the inner steel bundle is snapped, the FRP tendons can bear the whole tensile load, thus ensuring safety for the structure; significant structural deformation occurs, a sufficient warning time is gained for the replacement of the sling. The peripheral FRP tendons are disposed around the sling structure and protect the inner steel bundle, and the life of the inner steel bundle is prolonged. The FRP tendon-bundle hybrid sling structure has the advantages that certain preparing time is provided for post-snapping maintenance of the inner steel bundle of the sling, safety of a bridge girder structure is improved, and the FRP tendon-bundle hybrid sling structure can be widely applied to suspender structures and the like for tied-arch bridges and suspension bridges.

Description

technical field [0001] The invention belongs to the technical field of bridge structures, and relates to a tension suspension structure suitable for suspension rods or suspension bridge suspension cables, which are suitable for tension member properties of tie rod arch bridges in bridges. Background technique [0002] At present, the suspenders or slings used in arch bridges, cable-stayed bridges, and suspension bridges are basically all steel beams. This is a mainstream material and is still widely used. There is no other material that can replace steel beams to withstand tension. . However, the suspender (or sling) of this single material has the following problems, and needs to be continuously improved to ensure structural safety. [0003] First, the steel sling structure is susceptible to the dual effects of environmental corrosion and fatigue, resulting in a decrease in its effective stress area and a decrease in fatigue strength. Therefore, as an important tension me...

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Problems solved by technology

However, before the sling structure is replaced, it may suddenly break due to various random effects, resulting in sudden damage to the bridge structure. There is no warning before the damage, causing great losses

[0004] Second, due to the randomness of the factors that lead to the breakage of the bridge hanger structure, it is difficult to determine the accurate prediction time of the breakage of the hanger structure, which brings considerable challenges to the maintenance decision-making of the hanger

Due to the randomness of the load environment and corrosion environment, and the limitation of detection, for the specific bridge suspension structure, the exact time of its breakage cannot be predicted

In addition, the theories and methods used for component fatigue life assessment are also based on probability and statistics, which also determines that the predicted fatigue life can only be an uncertain statistic. The existing theories and technologies such as bridge health detection and life assessment are still developing In the middle, it is difficult to provide accurate decision-making data for the time being, and it is not wise to overestimate the bridge health monitoring system at present

[0005] Therefore, based on the fact that it is still difficult to predict the service life of the sling structure, it is urgent to adopt new design methods and new equipment to break through the existing difficulties. The present invention proposes a brand-new sling structure aimed at the current technical problems , from another way to solve the problem that the fatigue life of the sling structure is difficult to predict

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