Earthquake Response of Multi-Story Reinforced Concrete Plane Frame Structures and Seismic Design of Beam-Column Joints

Shiohara, Hitoshi; Kobayashi, Fuko; Sato, Yuka; Kusuhara, Fumio

doi:10.3130/aijs.82.1437

Cited by 2 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar tendencies were observed in previous studies (Joh et al [16] and Ichinose [7]). Our results for the lateral drift highlight the importance of considering the joint deformation since the primary source of the overall deformation of the specimens is joint deformation, which potentially causes a soft story mechanism [3,4].…”

Section: Lateral Drift Due To Shear Deformation (mentioning

confidence: 74%

“…Consequently, the global displacement ductility of the sub-assemblage is reduced, which reduces the collapse-prevention capacity of the overall frame structure. The second set of graphs corresponds to a moderate ductility demand (2)(3)(4), and the third set of graphs corresponds to a high ductility demand (>4), as the SDI values ranged from 0.11 to 0.4 for the specimens with moderate joint reinforcement ratios. Based on these three groups of graphs, the following simple equations are proposed to predict the SDI of RC interior beam-column joint connections corresponding to three different failure modes: J-mode, BJ-mode, and B-mode.…”

Section: Shear Stress and Shear Deformation Of Interior Jointsmentioning

confidence: 99%

“…They reported that the lateral strength and ductility of beam-column joint connections were not maximized when the flexural strength ratio was near unity. Other studies [3,4,26] recently conducted in Japan, including a three-dimensional full-scale shaking table test of an RC frame structure, revealed that for the smaller flexural strength ratios and joint hoop ratios, the joint deformation contributed about 40 to 60% of the total inter-story drift during earthquake loading. Consequently, the main flexibility source of the structural system was joint deformation, which significantly reduced the overall stability of the structure.…”

Section: Introductionmentioning

confidence: 99%

“…The design of beam-column joints is an integral part of earthquake design for reinforced concrete (RC) moment-resisting frames. The response of RC moment-resisting frames is significantly influenced by the diagonal cracking and bar bond-slip of the beam-column joints [1][2][3][4][5][6][7]. To prevent such structural damage in the joints, current design codes [8][9][10][11] have provisions for the design of beam-column joints.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Prediction of Joint Shear Deformation Index of RC Beam–Column Joints

Gombosuren

Maki

2020

Buildings

View full text Add to dashboard Cite

In the analysis of reinforced concrete (RC) buildings, beam–column joints are regarded as rigid nodes. In fact, joint deformation may make a significant difference in the lateral response of RC buildings if joints are not properly designed and detailed. To consider joint flexibility, several types of joint models have been proposed. However, these models require complicated computations, consequently making them challenging to apply in engineering practice. This paper proposed a simple approach for predicting the contribution of the joint deformation to the total deformation of RC interior beam–column joints under critical structural deformations. To develop such a simple and accurate approach, experimental and analytical studies were performed on RC interior beam–column joints. In this study, eight half-scale joint specimens were tested under reversed cyclic loading, and 39 full–scale FE models were constructed, varying the selected key parameters. The experimental and analytical results showed that the “joint shear” is a useful index for the beam–column joints with high shear stress levels of but is unsuitable for defining the failure of beam–column joints with medium or low shear stress levels of and . Based on the results, three equations were developed to predict the joint shear deformation index (SDI) of RC interior beam–column connections corresponding to three different types of failure (i.e., joint failure before beam yielding, joint failure after beam yielding, and beam flexural failure). SDI predictions of the proposed equations correlate well with 50 test results of beam–column joints available from the literature.

show abstract

Section: Lateral Drift Due To Shear Deformation (mentioning

confidence: 74%

Section: Shear Stress and Shear Deformation Of Interior Jointsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of Joint Shear Deformation Index of RC Beam–Column Joints

Gombosuren

Maki

2020

Buildings

View full text Add to dashboard Cite

show abstract

“…Tus, in structural analyses of RC MRF building systems subjected to seismic excitations, BC joints are typically modeled with rigid joint panels (i.e., rigid member-end ofsets in a centerline model), irrespective of the joint details. However, experimental and numerical investigations [17][18][19][20] have shown that BC joints in RC ductile MRF structures designed according to current codes may undergo a signifcant amount of diagonal cracking during a strong earthquake event. Moreover, other studies [21][22][23] have reported that inclined cracking in interior joints conforming to the requirements of modern design codes was initiated at nominal shear stresses of approximately 0.4…”

Section: Introductionmentioning

confidence: 99%

Effect of Joint Flexibility on Seismic Performance of a Reinforced Concrete Ductile Moment-Resisting Frame

Gombosuren

Maki

2022

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Currently, the seismic collapse risk of modern code-conforming reinforced concrete (RC) frame structures is often evaluated without considering the behavior of the beam-column (BC) joints since joints designed to meet modern concrete design codes are assumed to be sufficiently rigid. BC joints in RC ductile moment frames may undergo a significant amount of inclined cracking during strong earthquakes. Consequently, the stiffness, strength, and dynamic characteristics of the RC moment frames may vary. Hence, the rigid joint assumption may be unsuitable for assessing the seismic performances of RC ductile moment frames because the local strength and ductility demands of the constituent members can be misinterpreted by structural analyses based on the assumption of a rigid joint. In this study, nonlinear static and dynamic analyses are conducted to quantify the seismic response variations of low- to midrise RC-frame structures under different joint modeling assumptions. In total, six 2D continuum finite element models of four- and eight-story frames with rigid and flexible joints were constructed by simulating the actual structures as realistically as possible. The results indicate that the interior joints in the considered frames suffer light-to-moderate damage, and the effect of joint cracking is found to be significant in a four-story structure whose column-to-beam flexural strength ratio and column-to-beam area ratio are below 1.5. Such joint behavior demonstrates that current code provisions cannot ensure joint behavior compatible with the rigid joint assumption that is used in the practical structural analysis of RC-frame buildings.

show abstract

Earthquake Response of Multi-Story Reinforced Concrete Plane Frame Structures and Seismic Design of Beam-Column Joints

Cited by 2 publications

References 4 publications

Prediction of Joint Shear Deformation Index of RC Beam–Column Joints

Prediction of Joint Shear Deformation Index of RC Beam–Column Joints

Effect of Joint Flexibility on Seismic Performance of a Reinforced Concrete Ductile Moment-Resisting Frame

Contact Info

Product

Resources

About