Construction structure with strengthening device and method

Abstract

Construction system (5+6) for strengthening an existing structure (5) with tension sheets (3) provided in the direction of extension of said existing structure (5), said construction structure comprising at least one structural member (5) and respective anchoring device.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a construction structure or system with strengthening anchoring device in a construction for strengthening same, actually in the industry of strengthening existent structures.BACKGROUND OF THE INVENTION[0002]At first, existing old structures, like bridges, buildings, silos, need strengthening in order to sustain the increasing demand loads or new design codes. In addition, some of the existing structures are deteriorated due to their age or environmental conditions resulting in that they need strengthening as well.[0003]Many so-called R / C Reinforced Concrete structures need strengthening because they were built according to old seismic codes, thereby not meeting the requirements of new codes. The reason may also be that they are damaged after a strong earthquake sequence. One of the basic parameters of strengthening using so-called FRP—fiber reinforced polymer—layers externally, is the efficient anchorage of these polymer ...

AI Technical Summary

Benefits of technology

"The present invention provides a construction structure with an anchoring device for strengthening purposes. The anchoring device consists of a holder means and a shaft, with fastening means for securely anchoring the sheet means to the support element. The sheet means is connected to the support element at its bottom surface and its adjoining lateral surfaces. The anchoring device allows for the transfer of additional forces onto the structural member, improving its resistance. The invention also provides a method for bonding the sheet means to the support element and the supporting member, allowing for a safe and easily predictable transfer of additional forces. The invention further provides a composite reinforcing sheet made of fiber reinforced polymer or steel, which is bonded to the surface of the structural member or the supporting member. The invention allows for a secure and effective strengthening of construction structures."

Problems solved by technology

The main disadvantage of this anchoring device is focused on the eccentricity between the loading direction and the hold down of the L-shaped angle.

Indeed, it generates a large out-of-plane distortion of the FRP sheet from its loading plane, which finally leads to a reduced load carrying capacity of the strengthening scheme, especially under cyclic load loadings.

Another drawback of retrofitting using FRP is the problem caused by debonding of the FRP sheet from said supporting member or foundation.

However the viscous paste may not be strong enough to hold the FRP sheet.

The major disadvantage of that technique is that it cannot be used or it does not have a good behavior when it is used to strengthen joints in order to upgrade their flexural capacity.

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