论文部分内容阅读
研究了如何通过被动耗能方式对既有框架进行抗震加固。提出了一个基于能力谱和位移控制的迭代设计流程,并结合既有中心支撑钢框架结构讨论了该设计流程在实际应用中的有效性。该设计流程能够用于基于不同性能目标、采用任何类型的耗能装置进行抗震加固。在加固时采用的屈曲约束支撑用来防止结构构件和非结构构件的破坏。采用了传统的单模态Pushover分析(荷载和第一阶模态成正比)和多模态Pushover分析对既有框架结构的抗震加固进行分析。分析发现,对于中高层框架混凝土结构房屋(30m以上),耗能支撑设计过程中采用多模态Pushover分析比单模态Pushover分析结果更有效;然而采用屈曲约束支撑进行抗震加固后,房屋刚度变得规则,此时单模态Pushover分析和多模态Pushover分析得到的结果差别不大。
The paper studies how to reinforce the existing frame through passive energy dissipation. An iterative design flow based on capacity spectrum and displacement control was proposed. The effectiveness of this design flow in practical application was discussed in combination with the existing central support steel frame structure. This design flow can be used to aseismicly reinforce any type of energy-consuming device based on different performance goals. The buckling restraint brace used in reinforcement is used to prevent the destruction of structural and non-structural components. The traditional single modal pushover analysis (load proportional to the first order modal) and multi-modal pushover analysis are used to analyze the seismic strengthening of existing frame structures. The analysis shows that multi-modal pushover analysis is more effective than single-modal pushover analysis in medium-high-rise frame concrete buildings (over 30m), however, the stiffness of the building is variable after the buckling restraint brace is used for seismic strengthening Get the rules, then the results of single modal pushover analysis and multi-modal pushover analysis are not different.