ELASTIC-PLASTIC ANALYSIS OF REINFORCED CONCRETE FRAME IN CONCIDERATION OF FLUCTUATION OF AXIAL FORCES ON COLUMNS : Part I Analytical method and its application to structural tests of columns with core rebars in their centers

Based on the static test of large-scaled prestressed steel concrete frames, the behavior of crack were tested and investigated. In this paper, according to theory of reinforced concrete members, Code for design of concrete structures(GB 50010-2002)and code ACI 318—05, the formulas of cracking moment considering secondary axial forces were deduced and verified by test results. Conclusion can be drawn as follow: the calculation errors of formulas derive from theory of reinforced concrete members is small, generally less than 6%; the errors of formulas referring to Code for design of concrete structures(GB 50010-2002)is about 10%, which is satisfy the needs of engineering and simply to be calculated; Cracking moment calculated by formulas referring to code ACI 318—05 is less than test result, it is unsafe for engineering application.

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Shear Behavior of a Reinforced Concrete Frame Retrofitted with a Hinged Steel Damping System

Sustainability ◽

10.3390/su122410360 ◽

2020 ◽

Vol 12 (24) ◽

pp. 10360

Author(s):

Hyun-Do Yun ◽

Sun-Woong Kim ◽

Wan-Shin Park ◽

Sun-Woo Kim

Keyword(s):

Reinforced Concrete ◽

Shear Behavior ◽

Seismic Retrofitting ◽

Reinforced Concrete Frame ◽

Main Research ◽

Torsion Spring ◽

Concrete Frame ◽

Energy Dissipation Capacity ◽

Research Questions ◽

Torsion Springs

The purpose of this study was to experimentally evaluate the effect of a hinged steel damping system on the shear behavior of a nonductile reinforced concrete frame with an opening. For the experimental test, a total of three full-scale reinforced concrete frame specimens were planned, based on the “no retrofitting” (NR) specimens with non-seismic details. The main research questions were whether the hinged steel damping system is reinforced and whether torsion springs are installed in the hinged steel damping system. From the results of the experiment, the hinged steel damping system (DR specimen) was found to be effective in seismic retrofitting, while isolating the opening of the reinforced concrete (RC) frame, and the torsion spring installed at the hinged connection (DSR specimen) was evaluated to be effective in controlling the amount of deformation of the upper and lower dampers. The strength, stiffness, and energy dissipation capacity of the DSR specimen were slightly improved compared to the DR specimen, and it was confirmed that stress redistribution was induced by the rotational stiffness of the torsion spring installed in the hinge connection between the upper and lower frames.

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Time-History Analysis of Reinforced Concrete Frame Buildings with Soft Storeys

Arabian Journal for Science and Engineering ◽

10.1007/s13369-016-2366-1 ◽

2016 ◽

Vol 42 (3) ◽

pp. 1201-1217 ◽

Cited By ~ 2

Author(s):

Sayed Mahmoud ◽

Magdy Genidy ◽

Hesham Tahoon

Keyword(s):

Reinforced Concrete ◽

Time History ◽

Time History Analysis ◽

Reinforced Concrete Frame ◽

Concrete Frame ◽

History Analysis ◽

Frame Buildings

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Deformation Characteristics of Reinforced Concrete Beam-Column Joint Cores under Earthquake Loading

Advances in Structural Engineering ◽

10.1260/136943303321625694 ◽

2003 ◽

Vol 6 (1) ◽

pp. 15-21 ◽

Cited By ~ 7

Author(s):

Sayed A. Attaalla ◽

Mehran Agbabian

Keyword(s):

Reinforced Concrete ◽

Shear Deformation ◽

Concrete Beam ◽

Reinforced Concrete Beam ◽

Reinforced Concrete Frame ◽

Bond Failure ◽

Strain Compatibility ◽

Concrete Frame ◽

Column Joint ◽

Reinforced Concrete Frame Structures

The characteristics of the shear deformation inside the beam-column joint core of reinforced concrete frame structures subjected to seismic loading are discussed in this paper. The paper presents the formulation of an analytical model based on experimental observations. The model is intended to predict the expansions of beam-column joint core in the horizontal and vertical directions. The model describes the strain compatibility inside the joint in an average sense. Its predictions are verified utilizing experimental measurements obtained from tests conducted on beam-column connections. The model is found to adequately predict the components of shear deformation in the joint core and satisfactorily estimates the average strains in the joint hoops up to bond failure. The model may be considered as a simple, yet, important step towards analytical understanding of the sophisticated shear mechanism inside the joint and may be implemented in a controlled-deformation design technique of the joint.

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Resistance of Reinforced Concrete Frames with Masonry Infill Walls to In-Plane Vertical Loading

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.711.982 ◽

2016 ◽

Vol 711 ◽

pp. 982-988

Author(s):

Alex Brodsky ◽

David Z. Yankelevsky

Keyword(s):

Reinforced Concrete ◽

Failure Modes ◽

Progressive Collapse ◽

Lateral Loading ◽

Masonry Walls ◽

Reinforced Concrete Frame ◽

Masonry Infill ◽

Concrete Frame ◽

Vertical Loading ◽

Infill Masonry

Numerous studies have been conducted on the in plane behavior of masonry infill walls to lateral loading simulating earthquake action on buildings. The present study is focused on a problem that has almost not been studied regarding the vertical (opposed to lateral) in-plane action on these walls. This may be of concern when a supporting column of a multi-storey reinforced concrete frame with infill masonry walls undergoes a severe damage due to an extreme loading such as a strong earthquake, car impact or military or terror action in proximity to the column. The loss of the supporting column may cause a fully or partly progressive collapse to a bare reinforced concrete frame, without infill masonry walls. The presence of the infill masonry walls may restrain the process and prevent the development of a progressive collapse. The aim of the present study is to test the in-plane composite action of Reinforced Concrete (RC) frames with infill masonry walls under vertical loading through laboratory experiments and evaluate the contributions of infill masonry walls, in an attempt to examine the infill masonry wall added resistance to the bare frame under these circumstances. Preliminary results of laboratory tests that have been conducted on reinforced concrete infilled frames without a support at their end, under monotonic vertical loading along that column axis will be presented. The observed damages and failure modes under vertical loading are clearly different from the already known failure modes observed in the case of lateral loading.

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