Update to ASCE/SEI 41 Concrete Provisions

2007 ◽  
Vol 23 (3) ◽  
pp. 493-523 ◽  
Author(s):  
Kenneth J. Elwood ◽  
Adolfo B. Matamoros ◽  
John W. Wallace ◽  
Dawn E. Lehman ◽  
Jon A. Heintz ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Experimental Evidence ◽  
Concrete Beams ◽  
Seismic Retrofit ◽  
Empirical Models ◽  
Reinforced Concrete Beams ◽  
Existing Buildings ◽  
Structural Walls ◽  
Seismic Rehabilitation ◽  
Structural Capacity

A proposed supplement to ASCE/SEI 41 Seismic Rehabilitation of Existing Buildings has been developed for the purpose of updating provisions related to existing reinforced concrete buildings. Based on experimental evidence and empirical models, the proposed supplement includes revisions to modeling parameters and acceptance criteria for reinforced concrete beams, columns, structural walls, beam-column joints, and slab-column frames. The revisions are expected to result in substantially more accurate and, in most cases, more liberal assessments of the structural capacity of concrete components in seismic retrofit projects.

Seismic Rehabilitation of a School Building in Cephalonia, Greece

2020 ◽  
pp. 1-20
Author(s):  
Christos Giarlelis ◽  
Evlalia Lamprinou ◽  
Constantinos Repapis
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Earthquake Sequence ◽  
School Building ◽  
Structural Walls ◽  
Concrete Walls ◽  
Seismic Rehabilitation ◽  
Reinforced Concrete Walls ◽  
Structural Capacity ◽  
Structural Failures

<p>The 2014 earthquake sequence in Cephalonia, Greece, resulted in a number of structural failures. In Argostoli, the capital of the island, a school building suffered light damage; however, the structural assessment following the analysis procedures of the recently published Greek Code for Structural Interventions, showed that seismic strengthening is required. The structure was built on the aftermath of the catastrophic 1953 Ionian earthquake sequence based on older code requirements, which are much outdated, as indicated from the results of both modal response spectrum analyses and non-linear static analyses. The retrofit aims to increase the very low structural capacity of the building and as a means for that the use of concrete jackets is selected. Based on the results of the assessment, it was decided that concrete jackets should be applied to all columns, while large structural walls running along the transversal direction were strengthened with single-sided reinforced concrete jacketing. The interventions are limited by architectural demands and cost considerations. However, analyses of the strengthened structure show that the interventions improve its seismic behaviour adequately. The detailing of interventions is thoroughly presented. What makes this case study interesting is the unusual structural system of the building, which is an ingenious combination of frame elements and lightly reinforced concrete walls and its behaviour to one of the strongest recent Greek earthquakes. The rehabilitation study had to model correctly the structure and propose interventions that were in agreement with the architectural demands and the cost consideration.</p>

scholarly journals Flexural Behavior of Reinforced Concrete Beams Retrofitted with Modularized Steel Plates

2021 ◽  
Vol 11 (5) ◽  
pp. 2348
Author(s):  
Min Sook Kim ◽  
Young Hak Lee
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Load Capacity ◽  
Maximum Load ◽  
Reinforced Concrete Beams ◽  
Steel Plates ◽  
Flexural Behavior ◽  
Element Analysis ◽  
Flexural Performance ◽  
Structural Capacity

Many structural retrofitting methods tend to only focus on how to improve the strength and ductility of structural members. It is necessary for developing retrofitting strategy to consider not only upgrading the capacity but also achieving rapid and economical construction. In this paper, a new retrofitting details and technique is proposed to improve structural capacity and constructability for retrofitting reinforced concrete beams. The components of retrofitting are prefabricated, and the components are quickly assembled using bolts and chemical anchors on site. The details of modularized steel plates for retrofitting have been chosen based on the finite element analysis. To evaluate the structural performance of concrete beams retrofitted with the proposed details, five concrete beams with and without retrofitting were tested. The proposed retrofitting method significantly increased both the maximum load capacity and ductility of reinforced concrete beams. The test results showed that the flexural performance of the existing reinforced concrete beams increased by 3 times, the ductility by 2.5 times, and the energy dissipation capacity by 7 times.

scholarly journals Strengthening of reinforced concrete beams: RC versus UHPFRC layers

2021 ◽  
Author(s):  
Andreas Lampropoulos ◽  
Ourania Tsioulou ◽  
Spyridon Paschalis ◽  
Stephanos Dritsos
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fibre Reinforced Concrete ◽  
Rc Beams ◽  
Existing Buildings ◽  
Rc Structures ◽  
Interface Slip ◽  
High Performance Fibre

<p>Strengthening of Reinforced Concrete (RC) beams is of high importance for the structural upgrade of existing buildings. The majority of the existing RC structures need to be upgraded either because they are designed with old or without seismic code provisions or because of existing damages. In this study the effectiveness of the use of traditional RC layers is compared with the use of Ultra High Performance Fibre Reinforced Concrete (UHPFRC) layers. Experimental investigation has been conducted on beams strengthened with these two techniques and the effectiveness of the examined methods has been evaluated via comparisons of the load-deflection and the interface slip results.</p>

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