NSM-CFRP带加固钢筋混凝土短柱相互作用图的有限元法编制

IF 2.1 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Building Pathology and Adaptation Pub Date : 2022-10-31 DOI:10.1108/ijbpa-01-2022-0014

Y. Obeidat, Wasim S. Barham, Rawan Abu libdeh

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引用次数: 0

摘要

目的本研究的主要目的是研究近表面贴附碳纤维增强聚合物（CFRP）纵向带加固钢筋混凝土短柱的性能。设计/方法/方法使用ABAQUS开发了一个全三维有限元（FE）模型来进行分析。该模型首先根据文献中的实验数据进行了验证，然后在同心和偏心荷载情况下考虑了混凝土抗压强度、使用的CFRP条数及其间距的影响。参数研究样本被分为三组。第一组由未加固柱组成，并作为对照试样。第二组由在两个相对的柱面处用纵向CFRP带加固的柱组成。发现本研究的结果用于绘制CFRP加固短柱的相互作用图，并开发最佳拟合方程来估计这些加固柱的标称轴向荷载和弯矩承载力。结果表明，使用更多纵向CFRP带加固的试件显示出轴向承载力的显著提高和相互作用图的显著改善，尤其是在大荷载偏心值下。这一结果可以通过以下事实来证明，即纵向带有效地抵抗由于偏心载荷而产生的弯矩。通常，使用纵向带加固的过程只有合理的效果，并且在加固预算有限的情况下，考虑到经济方面，它通常可以被认为是一个很好的选择。原创性/价值本研究旨在利用有限元方法研究CFRP带加固矩形钢筋混凝土短柱的性能，绘制加固柱的相互作用图，以研究不同参数（如抗压强度（20、30和40MPa）、，CFRP带的数量（1、2、3和4）和CFRP带间距（CFRP中心点距离与柱外尺寸比的比值（0.60、0.70和0.80）对加固RC柱性能的影响，并改进经验公式来预测加固RC柱的标称轴向荷载和弯矩承载力。ACI-318（2014）中介绍了这些直接影响短柱承载能力的参数。

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Development of interaction diagrams of reinforced concrete short columns strengthened by NSM-CFRP strips using finite element method

PurposeThe main aim of this study is to examine the behavior of reinforced concrete short columns strengthened using longitudinal near surface mounted (NSM)-carbon fiber reinforced polymer (CFRP) strips.Design/methodology/approachA full 3D-finite element (FE) model was developed using ABAQUS in order to conduct the analysis. The model is first validated based on experimental data available in the literature, and then the effect of concrete compressive strength, number of CFRP strips that are used and the spacing between them were taken in consideration for both concentric and eccentric loading cases. The parametric study specimens were divided into three groups. The first group consisted of unstrengthened columns and served as control specimens. The second group consisted of columns strengthened by longitudinal CFRP strips at two opposite column faces.FindingsThe results of this study are used to develop interaction diagrams for CFRP-strengthened short columns and to develop best-fit equations to estimate the nominal axial load and moment capacities for these strengthened columns. The results showed that the specimens that were strengthened using more longitudinal CFRP strips showed a significant increase in axial load capacity and a significant improvement in the interaction diagram, especially at large load eccentricity values. This result can be justified by the fact that longitudinal strips effectively resist the bending moment that is generated due to eccentric loading. Generally, the process of strengthening using longitudinal strips only has a reasonable effect and it can be typically considered an excellent choice considering the economic aspect when the budget of strengthening is limited.Originality/valueThis research aims at studying the performance of strengthened rectangular reinforced concrete short columns with CFRP strips using FE method, developing interaction diagrams of strengthened columns in order to investigate the effect of different parameters such as compressive strength (20, 30 and 40 MPa), number of CFRP strips (1, 2, 3 and 4) and the spacing between CFRP strips in terms of the ratio of CFRP center point distance to column outside dimension ratio (0.60, 0.70 and 0.80) on the behavior of strengthened RC columns and improving empirical formulas to predict the nominal axial load and moment capacities of strengthened RC columns. These parameters that directly affect short column load carrying capacity are presented in ACI-318 (2014).

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来源期刊

International Journal of Building Pathology and Adaptation CONSTRUCTION & BUILDING TECHNOLOGY-

CiteScore

4.80

自引率

18.20%

发文量

期刊介绍： The International Journal of Building Pathology and Adaptation publishes findings on contemporary and original research towards sustaining, maintaining and managing existing buildings. The journal provides an interdisciplinary approach to the study of buildings, their performance and adaptation in order to develop appropriate technical and management solutions. This requires an holistic understanding of the complex interactions between the materials, components, occupants, design and environment, demanding the application and development of methodologies for diagnosis, prognosis and treatment in this multidisciplinary area. With rapid technological developments, a changing climate and more extreme weather, coupled with developing societal demands, the challenges to the professions responsible are complex and varied; solutions need to be rigorously researched and tested to navigate the dynamic context in which today''s buildings are to be sustained. Within this context, the scope and coverage of the journal incorporates the following indicative topics: • Behavioural and human responses • Building defects and prognosis • Building adaptation and retrofit • Building conservation and restoration • Building Information Modelling (BIM) • Building and planning regulations and legislation • Building technology • Conflict avoidance, management and disputes resolution • Digital information and communication technologies • Education and training • Environmental performance • Energy management • Health, safety and welfare issues • Healthy enclosures • Innovations and innovative technologies • Law and practice of dilapidation • Maintenance and refurbishment • Materials testing • Policy formulation and development • Project management • Resilience • Structural considerations • Surveying methodologies and techniques • Sustainability and climate change • Valuation and financial investment