1.苏州科技学大学土木工程学院,江苏 苏州 215011
2.西安建筑科技大学土木工程学院,陕西 西安 710055
方有珍(1972—),男,教授,博士。主要从事组合结构抗震性能研究。E‑mail:fyz72@mail.usts.edu.cn
收稿:2022-12-13,
修回:2023-01-14,
纸质出版:2025-08-28
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方有珍,杨勇,孙敏等.新型PEC柱‑钢梁BRS耗能部分自复位组合框架抗震试验研究[J].防灾减灾工程学报,2025,45(04):888-896.
FANG Youzhen,YANG Yong,SUN Min,et al.Experimental Study on Seismic Performance of a Novel PEC Column‑steel Beam Composite Frame with Partial Self‑centering BRS Energy‑dissipating Connection[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(04):888-896.
方有珍,杨勇,孙敏等.新型PEC柱‑钢梁BRS耗能部分自复位组合框架抗震试验研究[J].防灾减灾工程学报,2025,45(04):888-896. DOI: 10.13409/j.cnki.jdpme.20221213001.
FANG Youzhen,YANG Yong,SUN Min,et al.Experimental Study on Seismic Performance of a Novel PEC Column‑steel Beam Composite Frame with Partial Self‑centering BRS Energy‑dissipating Connection[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(04):888-896. DOI: 10.13409/j.cnki.jdpme.20221213001.
为进一步研究新型PEC柱‑钢梁部分自复位连接组合框架抗震性能,考虑预拉杆长度和新型PEC柱脚连接方式,设计制作3榀新型PEC柱‑钢梁BRS耗能部分自复位组合框架1∶2缩尺试件并进行低周往复荷载试验。基于试验观察和实测数据整理,分析了试件滞回特性、抗侧刚度、自复位功效、耗能能力等抗震性能。研究结果表明:新型PEC柱‑钢梁BRS耗能部分自复位连接组合框架可通过连接T形件长圆孔尺寸设计以实现“设计地震水平实现基本复位,大震设计水平下自复位连接转变为承压型传力模式实现部分复位”的性态化设计目标;在设计地震作用下,试件主要利用辅助BRS耗能件耗能,且残余侧移不超过自复位结构侧移限值(0.3%)要求,而在大震作用阶段,试件通过辅助BRS耗能元件耗能与结构主体构件损伤耗能相结合,承载能力呈增长趋势,且卸载后实现了部分复位功效;预拉杆设置有限长度可消除梁端拉压相消而小幅度提高了试件整体性,而新型PEC柱脚铰接明显削弱了结构整体性。
To further investigate the seismic performance of a novel PEC column-steel beam composite frame with partial self-centering connections
the length of the pre-stressed bars and the connection type at the base of the novel PEC column were considered. Three 1∶2 scale specimens of the PEC column-steel beam composite frame with partial self-centering BRS energy-dissipating connection were designed and fabricated
and low-cycle reverse loading tests were conducted. Based on test observations and measured data
the seismic performance of the specimens
including hysteretic characteristics
lateral stiffness
self-centering function
and energy dissipation capacity
was analyzed. The results showed that the PEC column-steel beam composite frame with partial self-centering BRS energy-dissipating connection could achieve the performance-based design goal of "self-centering at the design-earthquake level
and partial self-centering at the maximum considered earthquake level due to the connection transitioning to a bearing-type connection" through the dimensional design of the long slotted holes in the T-shaped connector. Under the design earthquake level
the specimens primarily utilized BRS energy-dissipating components to dissipate energy
and the residual lateral drift did not exceed the self-centering limit (0.3%). At the maximum considered earthquake level
the specimens dissipated energy through a combination of the auxiliary BRS energy-dissipating elements and damage to the main structural components
demonstrating increasing bearing capacity while achieving partial self-centering function upon unloading. The limited length of the pre-stressed bars could eliminate the counteracting effects of tension and compression at the beam ends
slightly improving the overall integrity of the specimens. The hinged connection at the base of the new PEC column significantly weakened the structural integrity.
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