Seismic Response of Reinforced Concrete Frames with Haunch Retrofit Solution

Sharma, Akanshu; Reddy, G. R.; Eligehausen, Rolf; Genesio, G.; Pampanin, Stefano

doi:10.14359/51686625

Cited by 38 publications

(22 citation statements)

References 5 publications

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“…Judging from the research results mentioned above and other literatures (Campione et al 2015;Ruiz-Pinilla et al 2014;Bansal et al 2016;Tsonos 2010;Sharma et al 2014), it was obvious that such developed retrofit techniques were effective in enhancing the seismic performance of exterior beam-column joints. However, the most significant disadvantage of the previous retrofit techniques was the lack of practicability.…”

Section: Introductionmentioning

confidence: 91%

Seismic Performance of Exterior RC Beam–Column Joints Retrofitted using Various Retrofit Solutions

Truong

Dinh

Kim

et al. 2017

Int J Concr Struct Mater

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Beam-column joints in existing concrete buildings might not satisfy the design requirements for seismic reinforcement details specified in current seismic design codes. Thus, in this study, various retrofit solutions for existing exterior beam-column joints with non-seismic details were developed: head re-bars anchoring, carbon fiber reinforced polymer (CFRP) wrapping, haunch retrofit element, and steel jacketing with various shapes and sizes. To investigate the seismic performance of exterior joints strengthened with the proposed retrofit solutions, seven half-scale exterior reinforced concrete beam-column joints including one control specimen and six retrofitted specimens were fabricated and tested under cyclic loading simulating earthquake loading. The test results showed that the proposed retrofit solutions could partially enhance the seismic capacity of the beam-column joints: steel jackets could increase deformation and load-carrying capacities; steel haunch elements could increase the load-carrying capacity, stiffness, and dissipated energy; and head re-bar anchoring and CFRP wrapping did not significantly effect on the seismic capacity of the beam-column joints.

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Section: Introductionmentioning

confidence: 91%

Seismic Performance of Exterior RC Beam–Column Joints Retrofitted using Various Retrofit Solutions

Truong

Dinh

Kim

et al. 2017

Int J Concr Struct Mater

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“…The main objective of this section is to explain the mechanics of the bracket system and to present the basic formulations for the design of these elements. In order to provide effective transfer of the large magnitude of loads anticipated in extreme events, the two ends of the arch knee brace have to be connected to the structure by using post-installed anchoring systems [17,18], which is schematically shown in Figure 7a. If the architectural bracket of reasonable dimensions can possess adequate strength capacity, it could then become an attractive technique for upgrading or retrofitting building structures.…”

Section: Mechanics Of Architectural Bracketsmentioning

confidence: 99%

“…Another possible approach is to install an element, such as a diagonal haunch [11,12], a steel angle [13], an L-profile [14] or a buckling-restrained knee brace/haunch [15,16] at the corner of two connecting members (e.g., beam and column). The element can be attached to the members using post-tensioning bar system external to the structure, whilst the use of post-installed anchoring system could make these techniques less invasive and practically more feasible [17,18]. In addition, joint enlargement is potentially a feasible strategy in certain cases [19,20].…”

Section: Introductionmentioning

confidence: 99%

Innovative Upscaling of Architectural Elements for Strengthening Building Structures

Tsang

2019

Sustainability

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For conservation of heritages or life prolongation of aged buildings that contributes to environmental sustainability, there is a global need of structural strengthening or upgrading so as to restore their original functions or fulfil more stringent performance requirements stipulated in modern design codes of practice. However, the actual implementation is usually met with resistance from the property owner; hence, it is desirable to adopt an effective, economical and less invasive technique. In order to provide a further incentive, this article explores an innovative idea of upscaling decorative architectural elements, such as brackets, knee braces and corbels, in order that they also possess adequate strength capacity to resist extreme loadings such as earthquake actions. The required dimensions of architectural brackets for seismic retrofitting of concrete beam-column joints are calculated for different levels of seismicity through a parametric study. It is demonstrated that the proposed design can enhance both the aesthetics and structural performance of a building. This exemplifies how art can be integrated into engineering design for solving real-world problems.

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“…The haunch element used in this test consisted of three steel plates welded together. The design length of haunch element is 424 mm, which is 0.2 times the length of the beam (2100 mm), according to the recommendation by Sharma et al [13]. To connect the haunch element with beam and column, five anchor bolts HILTI HSL-3 M12 (the diameter of 12 mm and the length of 120 mm) at each side of beam and column were used.…”

Section: Test Specimensmentioning

confidence: 99%

Experimental Study on Structural Performance of RC Exterior Beam-Column Joints Retrofitted by Steel Jacketing and Haunch Element under Cyclic Loading Simulating Earthquake Excitation

Dang

Dinh

2017

Advances in Civil Engineering

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Several retrofitting methods for reinforced concrete (RC) beam-column joints in old buildings without seismic details were developed. Four half-scale RC exterior beam-column joints were fabricated and tested under cyclic loading simulating earthquake excitation. The control specimen was designed to fail in joint shear. Two practical retrofitting strategies were applied to the control specimen which consider the architectural characteristic in real buildings, including steel jacketing and haunch retrofit solution. The structural performance of the test specimens was investigated in terms of various factors including damage and failure, loaddrift relationship, ductility, dissipated energy, and strain profiles of longitudinal reinforcement. Experimental results confirmed that the proposed retrofit methods were shown to enhance the seismic capacity of the joints in terms of the strength, deformation capacity, and energy dissipation capacity while the shear deformation in the panel zone significantly reduced in comparison with the control specimen.

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Seismic Response of Reinforced Concrete Frames with Haunch Retrofit Solution

Cited by 38 publications

References 5 publications

Seismic Performance of Exterior RC Beam–Column Joints Retrofitted using Various Retrofit Solutions

Seismic Performance of Exterior RC Beam–Column Joints Retrofitted using Various Retrofit Solutions

Innovative Upscaling of Architectural Elements for Strengthening Building Structures

Experimental Study on Structural Performance of RC Exterior Beam-Column Joints Retrofitted by Steel Jacketing and Haunch Element under Cyclic Loading Simulating Earthquake Excitation

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