曾聪, 张翼飞, 许国山, 王涛, 潘天林, 王德弘. T型内芯防屈曲支撑的拟静力滞回性能试验研究[J]. 工程力学, 2021, 38(9): 124-132, 181. DOI: 10.6052/j.issn.1000-4750.2020.09.0635
引用本文: 曾聪, 张翼飞, 许国山, 王涛, 潘天林, 王德弘. T型内芯防屈曲支撑的拟静力滞回性能试验研究[J]. 工程力学, 2021, 38(9): 124-132, 181. DOI: 10.6052/j.issn.1000-4750.2020.09.0635
ZENG Cong, ZHANG Yi-fei, XU Guo-shan, WANG Tao, PAN Tian-lin, WANG De-hong. QUASI-STATIC CYCLIC TESTS ON THE HYSTERETIC BEHAVIOR OF BUCKLING-RESTRAINED BRACES WITH A T-SECTION CORE[J]. Engineering Mechanics, 2021, 38(9): 124-132, 181. DOI: 10.6052/j.issn.1000-4750.2020.09.0635
Citation: ZENG Cong, ZHANG Yi-fei, XU Guo-shan, WANG Tao, PAN Tian-lin, WANG De-hong. QUASI-STATIC CYCLIC TESTS ON THE HYSTERETIC BEHAVIOR OF BUCKLING-RESTRAINED BRACES WITH A T-SECTION CORE[J]. Engineering Mechanics, 2021, 38(9): 124-132, 181. DOI: 10.6052/j.issn.1000-4750.2020.09.0635

T型内芯防屈曲支撑的拟静力滞回性能试验研究

QUASI-STATIC CYCLIC TESTS ON THE HYSTERETIC BEHAVIOR OF BUCKLING-RESTRAINED BRACES WITH A T-SECTION CORE

  • 摘要: 提出了一种内芯与约束构件均为型钢的全钢装配式防屈曲支撑,该支撑具有全装配、内芯可更换、工艺简单、造价低廉和可用于既有构件加固等优点。钢内芯由2个角钢与加劲板组成T型截面,外约束构件由角钢和盖板通过螺栓连接形成。对6个该支撑试件进行拟静力试验,讨论其滞回性能、抗震性能及破坏机理,并分析内芯上设置填板、内芯与约束构件的间隙、内芯双角钢之间的间距以及限位方式对滞回性能的影响。结果表明,该支撑的实际性能与设计性能基本一致,具有稳定的滞回性能;在支撑中间设置填板对支撑的滞回性能基本没有影响;内芯与约束构件的间隙及内芯双角钢之间的间距过大会降低支撑的滞回性能;采用中部限位方式的支撑滞回性能优于端部限位方式。对试件的抗震性能分析表明,该支撑具有较好的延性和累积塑性变形能力,可作为阻尼器应用于结构中。通过分析破坏模式发现,加劲板末端的焊缝应力集中会造成支撑的断裂位置由屈服段转移至止焊处;设置中部限位卡可以减小摩擦力的不利影响。

     

    Abstract: An all-steel assembled buckling-restrained brace is proposed, in which both the core and the restraining members are made of section-steel. The brace has the advantages of assembly, replaceable core, easy fabrication, low cost and can be used for strengthening existing members. The steel core is composed of two angle steels and stiffening plates to form a T-shaped section. The restraining members are formed by bolting plates and angle steels through mat strips. Quasi-static cyclic tests for six specimens were carried out to investigate the hysteretic performance, seismic performance and failure modes. The effects of adding filler plates in the core, the gap between the core and the restraining members, the spacing between the two angle steels of the core, and the stopper configuration on the hysteretic performance were analyzed. The results show that the actual performance of the brace was basically consistent with the design performance. The brace specimens exhibited stable hysteretic performance. Adding filler plates in the middle of the core shows little influence on the hysteresis performance. An excessive gap between the core and the restraining member and excessive spacing between the two steel angles of the core reduced the hysteresis performance. The hysteretic performance of the braces with middle stoppers were better than the brace with end stoppers. The analysis of the seismic performance of the specimens shows that the braces have satisfactory ductility and cumulative plastic deformation capacity, which can be used as dampers in structures. By analyzing the failure modes, the stress concentration of the welding at the end of the stiffening plates will make the failure position move from the yielding segment to the stop of the weld. The middle stopper of the core can reduce the adverse effects of friction.

     

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