Experimental and numerical investigations on the influence of transverse beams and slab on the seismic behavior of non-seismically designed exterior beam-column joints

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL
Margaritis Tonidis, Akanshu Sharma, Veit Birtel
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Abstract

The study presents experimental and numerical results on two-dimensional and three-dimensional full-scale exterior non-seismically designed (NSD) reinforced concrete (RC) beam-column joint subassemblies subjected to quasi-static cyclic lateral loading. The tests were augmented by detailed 3D finite element modeling to obtain further information about the joint behavior. Through these systematic investigations and their detailed evaluation, clear conclusions could be drawn on the effect of transverse beams and slab on the overall seismic behavior of beam-column joints, where the joint core was devoid of transverse reinforcement. It was found that the presence of transverse beams enhanced both the ultimate joint shear strength and joint shear strength at first joint cracking. The crack development in concrete revealed that the diagonal joint shear cracks extended from the joint core into the transverse beams. The slab participation under flexure, when acting in tension, decreased with increase in drift due to intervening loss in joint stiffness, which was inconsistent with the observations in subassemblies where the joints were confined with transverse reinforcement. It was found that the inclined cracking in the transverse beams was caused due to joint shear stresses and aggravated due to torsional stresses when a slab was present. Normalized joint shear stress and principal tensile stress values were evaluated for first joint shear cracking and ultimate joint shear strength. These values may be useful for the seismic assessment of non-seismically designed beam-column joints with transverse beams and slab.

Abstract Image

横梁和楼板对非抗震设计外部梁柱连接处抗震行为影响的实验和数值研究
该研究介绍了二维和三维全尺寸外部非抗震设计(NSD)钢筋混凝土(RC)梁柱连接组件在承受准静态循环侧向荷载时的实验和数值结果。这些试验通过详细的三维有限元建模进行补充,以获得有关连接行为的更多信息。通过这些系统的研究和详细的评估,可以得出明确的结论,即横向梁和板对没有横向钢筋的梁柱连接整体抗震性能的影响。研究发现,横梁的存在提高了接头的极限抗剪强度和接头首次开裂时的抗剪强度。混凝土裂缝的发展表明,斜接缝剪切裂缝从接缝核心延伸到横梁。在拉力作用下,板在挠曲下的参与随漂移的增加而减少,这是由于连接刚度的损失造成的,这与在连接处用横向钢筋限制的组件中观察到的情况不一致。研究发现,横向梁的倾斜开裂是由连接剪应力引起的,而当有板存在时,则会因扭转应力而加剧。对首次接头剪切开裂和极限接头剪切强度的归一化接头剪应力和主拉应力值进行了评估。这些值可能有助于对横梁和板的非抗震设计梁柱连接进行抗震评估。
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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
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