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Seismic Performance of Enhanced Restrained CFST Frame-Core Tube Structure
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摘要: 为了充分发挥钢管混凝土框架-核心筒结构的承载和抗震潜力,提升强震下重要工程结构的安全性,对钢管混凝土框架-核心筒结构体系分别采取柱端拉筋和“强连梁、强墙肢”等增强约束措施,探讨其对位移响应、塑性耗能、震后刚度损伤、二道防线和破坏模式的影响。分析结果显示:
1)核心筒作为结构第一道防线,当结构塑性发展程度较小时,采取“强连梁、强墙肢”增强约束措施对结构变形的影响效果更佳;但随着结构进入塑性大变形阶段,采取柱端拉筋增强约束措施对底部加强区的层间变形的改善效果也很显著。
2)柱端拉筋增强约束措施对外框架二道防线的抗震性能影响显著,内拉筋构造技术提升了钢管混凝土柱的承载能力,保证了超强地震中框架柱不发生严重破坏,使得外框架将承担更大的地震倾覆力矩和剪力,从而协调内筒一起抵抗地震作用,并减缓内筒的损伤和塑性变形发展,有效发挥二道防线的抗震性能,实现整体结构不倒塌。
3)柱端拉筋增强约束措施改善了“强筒弱框”的破坏模式,内拉筋提升了钢管混凝土柱的耗能能力,有效限制了内筒塑性大变形发展,进一步扩大了核心筒墙肢耗能范围,使得墙肢和框架柱的塑性耗能分布更为合理,塑性发展更加均匀,形成了合理的双重防线破坏模式,因而最终减缓了结构整体刚度退化,提升了结构延性和抗震韧性。-
关键词:
- 钢管混凝土框架-核心筒结构 /
- 增强约束 /
- 超强地震 /
- 抗震性能
Abstract: In order to fully utilize the load-bearing capacity and seismic resistance potential of the CFST frame-core tube structure and enhance the safety of important engineering structures under strong earthquakes, the enhanced constraint measures including stirrup-confining concrete at column end and “strengthening coupling beam and wall pier ” were used in the CFST frame-core tube structure system. The influence of these measures on displacement response, plastic energy dissipation, stiffness damage, second line of defense and failure mode were discussed. The analysis results showed that:
1)The core tube as the first line of defense for the structure, when the plastic deformation of the structure is small, the measure of “coupling beam and wall pier strengthened” has a greater impact on structural deformation. However, the measure of column end stirrup-confined has a significant impact on the interlayer deformation of the bottom reinforcement area when in the stage of large plastic deformation.
2)The measure of column end stirrup-confined has a significant impact on the seismic performance of the external frame as a second line of defense. It can enhance the loading-bearing capacity of CFST columns and ensure that the columns in external frame do not suffer serious damage during super strong earthquakes. In this case, more torque and shear force are borne by the external frame, coordinating with the core tube to resist seismic force, reducing the damage and plastic deformation of the core tube, effectively exerting the seismic performance of the second line of defense, and ultimately achieving the goal of not collapsing.
3)The measure of column end stirrup-confined has changed the failure mode of “strong core tube and weak frame”, and improved the energy dissipation capacity of concrete-filled steel tube column， significantly improving the toughness of CFST columns and limiting the displacement of the core tube in large plastic deformation, further expanding the energy dissipation range of the wall pier. At the same time, this measure makes the plastic energy dissipation distribution of wall pier in core tube and CFST columns in external frame more reasonable, forming a reasonable double line of defense failure mode, slowing down the degradation of structural stiffness, improving the ductility and seismic toughness of the structure. -
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