Repair of local damages to precast prestressed slab elements at a parking garage

Marta Lutomirska,Tomasz Lutomirski,Artur Sakowski,S Pantelakis,G Lampeas,K Tserpes

doi:10.1051/matecconf/202134904013

Marta Lutomirska, Tomasz Lutomirski + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/202134904013

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Abstract

The durability of precast structures often depends on quality of execution of the connections between the structural elements. Essential also is their design and proper exploitation. This paper focuses on the magnitude of damages as well as repair methods used for a precast slab, which consists of prestressed double T slab elements supported on prestressed inverted T girders. It was found that during execution, the girders were forced to fit dowel bars, which resulted in their initial deformation. Moreover, those connection zones were subjected to unpredicted loading coming from delivery trucks. It resulted in crushing of the elastomeric bearings, uncontrolled rotation of double T precast elements, and further deformation of dowel bars. Numerous cracks, splits, concrete spalling, surface rust stains, and efflorescence were observed. To prevent failure, a project for repair was developed. The slab was lifted with the use of a jacks to provide necessary space for work. Damaged dowel bars and elastomeric bearings were removed. The concrete surface of double T beams and the inverted T girder was cleaned, refilled, prepared, and strengthened with FRP wraps. Additionally, steel angles were used to protect the edges of the inverted T girder.

Highlights

Structural precast elements are characterized with very high quality owing to high quality control during the production process, which can be more obtained in factories than on construction sites
The slab was lifted with the use of a jack to provide necessary space for work including strengthening of the double T beams, protecting the inverted T girder and changing of the elastomeric bearings
The objective of this paper was to present and discuss the assessment of damages occurred to the precast slab in a parking garage, as well as the process of repair

Summary

Introduction

Structural precast elements are characterized with very high quality owing to high quality control during the production process, which can be more obtained in factories than on construction sites. The durability of precast structures is sensitive to the quality of assembly and proper exploitation of the structure. Precast producers have developed a variety of connection details to fulfil design code requirements and provide optimal solutions. Despite this fact, they tend to provoke problems of complex origins [1,2,3]. The mistakes leading to structural failure may arise at the stage of design, construction, and exploitation [4]

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