含减振子结构的巨型框架结构抗震性能及功能可恢复研究

A novel structural system develops from partially changing substructures of the mega-frame structures, which is composed of a mega-frame and a number of substructures, to the vibration reduction substructures has been put forward in this research. Isolation bearings are placed between columns of substructures and the mega-frame beams, and energy-dissipating dampers between substructure beams and the mega-frame columns. Then the vibration reduction substructure works as a TMD with a massive mass. The vibration reduction substructures achieve a significant vibration reduction effect. After due considerable design, an expected vibration reduction effect is achieved, and makes sure that 'undamaged after design level earthquakes, resilient after severe earthquakes and not collapsed remains standing after great earthquakes. (1) Key issues like the seismic behaviour, optimal vibration reduction parameters and earthquake resilience need to be investigated. (2) The influence of the arrangement of the substructure and various parameters on vibration reduction needs to be considered by finite element analysis and experiments. This research has improved the robustness of the mass and period of the vibration reduction substructure to the damping effect and has solved the collision issue between the primary structures and substructures. (3) The mechanism of damage and failure has been revealed. By a considerable design of mega-columns, replaceable coupling beams, and vibration reduction substructures, controllable, replaceable and recoverable failure mode has been achieved. The mega-frame with vibration reduction structures will be an earthquake resilient structure. This research has provided instructive aid to dynamic analysis of high-rise structures and earthquake resilience researches.

含减振子结构的巨型框架结构充分利用巨型框架结构由主、次结构共同组成的特点，在部分次框架底层柱底和相连的主框架梁之间设置隔震支座，次框架梁与相连的主框架柱之间设置耗能阻尼器，使整个次框架结构连同隔震支座和耗能阻尼器一起形成一个具有超大质量块的调谐质量阻尼器（TMD），可产生显著的减震效果。目前针对这一结构体系抗震能力的研究还不够深入。为实现“中震不坏，强震功能可恢复，特大震不倒”的抗震性能目标，本项目拟展开以下研究：（1）研究减振子结构布置和参数对减震效果的影响，改善对减振子结构参数变化的鲁棒性，并解决主、次框架碰撞问题；（2）揭示强震下的损伤机理和灾变机制，提出构件和结构的性能指标和能力需求，指导基于性能的抗震设计；（3）通过合理设计，引导结构损伤位置发生在可更换连梁和减振子结构耗能元件上，实现结构灾变可控、易修复。研究成果将对超高层结构动力灾变及功能可恢复的研究和应用提供重要参考。

含减振子结构的巨型框架结构充分利用巨型框架结构由主、次结构共同组成的特点，在部分次框架底层柱底和相连的主框架梁之间设置隔震支座，次框架梁与相连的主框架柱之间设置耗能阻尼器，使整个次框架结构连同隔震支座和耗能阻尼器一起形成一个具有超大质量块的调谐质量阻尼器（TMD），产生显著的减震效果。课题针对这一结构体系抗震能力展开系统研究，主要研究内容为：（1）含减振子结构的巨型框架结构耗能分布特征及破坏模式；（2）含减振子结构的巨型框架结构体系设计方法研究；（3）含减振子结构的巨型框架结构功能可恢复研究。. 研究结果表明：（1）巨型框架结构具有良好的抗震性能和抗倒塌性能，但并不能实现的屈服破坏机制应“次框架梁→次框架柱→主框架梁→主框架柱”的破坏过程，巨型柱和巨型节点是主要耗能构件。（3）含减振子结构的巨型框架结构在频率比为0.6~1.2时具有明显的减震效果，且对减振子结构的频率变化具有较好的鲁棒性；当频率比为0.96时，减震效果较好。（4）课题对不同构造形式的伸臂桁架结构的抗震性能进行试验和数值模拟研究，结果表明高强钢耗能伸臂桁架试件具有良好的抗震性能。（5）提出了减振子结构隔震支座等参数设计方法。研究成果将对超高层结构动力灾变及功能可恢复的研究和应用提供重要参考。