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1.河北工程大学土木工程学院,河北 邯郸 056038
2.天津大学建筑工程学院,天津 300350
3.华恒建设集团有限公司,浙江 宁波 315012
4.西华大学建筑与土木工程学院,四川 成都 610039
5.工程结构抗震防灾重庆市重点实验室,重庆 400045
Received:08 August 2024,
Revised:2024-09-30,
Published:28 April 2026
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李悦悦,宋维举,徐军等.掉层钢筋混凝土框架结构上接地隔震性能分析[J].防灾减灾工程学报,2026,46(02):379-389.
LI Yueyue,SONG Weiju,XU Jun,et al.Seismic Performance of Split‑foundation Reinforced Concrete Frame Structures with Upper Ground Plane[J].Journal of Disaster Prevention and Mitigation Engineering,2026,46(02):379-389.
李悦悦,宋维举,徐军等.掉层钢筋混凝土框架结构上接地隔震性能分析[J].防灾减灾工程学报,2026,46(02):379-389. DOI: 10.13409/j.cnki.jdpme.20240808001.
LI Yueyue,SONG Weiju,XU Jun,et al.Seismic Performance of Split‑foundation Reinforced Concrete Frame Structures with Upper Ground Plane[J].Journal of Disaster Prevention and Mitigation Engineering,2026,46(02):379-389. DOI: 10.13409/j.cnki.jdpme.20240808001.
由于掉层钢筋混凝土框架结构上接地侧和掉层侧的抗侧刚度分布极不均匀,其上接地层会出现“半层屈服”现象,不利于结构整体抗震性能发挥。本文基于上接地层抗侧刚度均匀化的设计思想,通过在上接地柱底设置水平刚度与掉层侧柱平均抗侧刚度接近的隔震支座来形成上接地隔震结构体系,分析了该体系在地震下上接地层柱剪力、最大层间位移角和塑性铰的分布情况,并探讨了隔震支座规格对其抗震性能的影响规律。结果表明:使用水平刚度与掉层侧平均抗侧刚度接近的隔震支座可显著改善结构上接地层柱剪力分配的不均匀程度,减小上接地层的最大层间位移角,避免上接地柱发生严重局部破坏,从而降低结构局部倒塌风险;在设计中可通过控制选用隔震支座的刚度与掉层侧柱平均抗侧刚度的比值来控制结构在罕遇地震作用下的损伤程度,进而提高结构的整体抗震性能。
Due to the highly uneven distribution of lateral stiffness between the upper grounding side and the split-foundation side of a split-foundation reinforced concrete frame structure
the "half-layer yielding" phenomenon occurs in its upper ground plane
which undermines the overall seismic performance of the structure. Based on the design concept of uniform lateral stiffness in the upper ground plane
an upper-ground isolation structural system was established by installing isolation bearings at the base of the upper ground columns
with horizontal stiffness close to the average lateral stiffness of the split-foundation side columns. The distribution of column shear forces
maximum interstory displacement angles
and plastic hinges in the upper ground plane under earthquake was analyzed
and the influence of isolation bearing specifications on the seismic performance was investigated. The results indicated that using isolation bearings with horizontal stiffness close to the average lateral stiffness of the split-foundation side columns could significantly improve the uniformity of column shear force distribution in the upper ground plane
reduce the maximum interstory displacement angle of this plane
and prevent severe local damage to the upper ground columns
thereby lowering the risk of local structural collapse. In design
the damage level of the structure under rare earthquakes can be controlled by adjusting the ratio of the stiffness of the selected isolation bearings to the average lateral stiffness of the split-foundation side columns
thereby enhancing the overall seismic performance of the structure.
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