用聚合物改性砂浆包覆焊接钢丝网修补的钢筋混凝土梁柱节点的性能

IF 1.4 4区工程技术 Q3 ENGINEERING, CIVIL

Earthquakes and Structures Pub Date : 2021-07-01 DOI:10.12989/EAS.2021.21.1.079

C. Marthong, J. Vanlalruata

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引用次数: 1

摘要

本文报道了修复后的钢筋混凝土外梁柱节点的性能。研究的目的是恢复失去的能力，梁柱节点到原来的状态或更多。采用冷节点在柱内不同位置的五种外梁柱节点进行浇铸，并进行反向循环加载。采用20mm网格尺寸的焊接钢丝网(WWM)对损伤区域进行限制，并采用聚合物改性砂浆(PMM)护套。修复后的损伤试件也受到与对照试件相似的循环位移。分析了承载能力、能量耗散、延性、刚度退化、等效粘性阻尼、损伤指标和名义主拉应力等地震参数。结果表明，修复后的试件具有较好的抗震性能，因此采用的修复策略是合理的。这些发现将有助于现场工程师采用一种合适的快速、经济的修复技术来修复受损的框架结构节点，以供震后使用。此外，研究表明，对于低层柱，冷节点的位置远离梁的拱背，可以提高试件的抗震能力。

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Behaviour of repaired RC beam-column joints using welded wire mesh and jacketed with polymer modified mortar

The performances of repaired RC exterior beam-column joints were reported in this paper. The aim of the study was to restore back the lost capacity of the beam-column joint to the original state or more. Five type of exterior beam-column joint with different position of cold joint in the column were casted and subjected to reversed cyclic loading. The damage zones were confined with welded wire mesh (WWM) of 20 mm grid size and jacketed with polymer modified mortar (PMM). Damaged specimens after repairing were also subjected to similar cyclic displacement as those of control specimens. Seismic parameters such as load carrying capacity, energy dissipation, ductility, stiffness degradation, equivalent viscous damping, damage indices and nominal principal tensile stresses were analyzed. Results show that repaired specimens exhibited better seismic performance and hence the adopted repairing strategies could be considered as appropriate. These findings would be helpful to the field engineers to adopt a suitable rapid and cost-efficient repairing technique for restoring the damaged frame structural joints for post-earthquake usage. Further, the study revealed that there is an improvement in seismic capacity of the specimens as the location of cold joint is placed away from the soffit of the beam for lower story column.

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来源期刊

Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

2.90

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response