新型装配式组合(耗能)剪力墙结构抗震性能与设计理论

Assembled structure has already been an inevitable trend with strong vitality and prospects in process of architectual indestrialization in China. A new assembled composite (energy dissipation) shear-wall structure with ideas of seamless connection of joints and dry connection characteristics is proposed in this project. Seismic peerformance and design theory of the new structure system are studied in detail by means of model experiments, numerical simulation and theroy analysis. Firstly, the seismic performance of assembled shear-wall members with and without energy-dissipation modules, such as internal-force distribution, damage process and energy-dissipaton principle, are investigated. Force transmission mechanism of the horizontal and vertical connection seams among modules is fully researched. And then bearing capacity calculation formulas of shear-wall modules and also connection seams are derived strictly. A moment-corner restoring force model simulating the connection seams among modules is advanced. Secondly, mechanical performance of assembled spatial shear-wall strtucture is conducted and corresponding dynamic responses, internal-force redistribution, plastic damage accumulation of spatial structures, structural members and connection seams are reproduced based on experiments and simulation, whcih verify the reliability and feasibility of the proposed assembled composite shear-wall structural systems. Finally, performance levels, performance indicators and corresponding failure criterias of the new assembled structures are discussed and established. Displacement-based performance design method for the new structural systems is proposed at last to guide actual structural design. Research of this project can make up for the lack of study of the assembled shear-wall structures and will provide technical and theoretical support in a certain extent for standardization and industrialization design.

装配式结构已成为我国建筑产业化发展的必然趋势，前景广阔。本项目提出具有节点无拼缝设计思想、干式连接形式的新型装配式组合(耗能)剪力墙结构体系，采用模型试验、数值仿真和理论分析相结合的方法对其进行抗震性能和设计理论研究。首先，研究装配式组合(耗能)剪力墙构件的抗震性能，探讨内力分布、损伤过程与耗能原理，揭示模块之间水平和竖向接缝连接的传力机制，推导剪力墙模块、模块之间连接的承载力公式，建立装配式连接的弯矩-转角恢复力模型；其次，开展空间结构性能研究，再现装配式结构、构件及其连接的动力响应、内力重分布与塑性损伤累积，揭示基于节点无拼缝设计思想的装配式结构体系的整体性及其减震性能；最后，研究新型装配式结构的量化性能水平和性能指标，建立失效判别标准，提出基于位移的抗震性能设计方法。研究成果有助于弥补装配式剪力墙结构抗震性能研究的不足，为其标准化、产业化设计提供理论参考和技术支撑。

与现浇钢筋混凝土结构体系相比，装配式结构具有构件标准化设计、快速建造、环境友好等优点。现有装配式结构存在钢筋连接对位困难、灌浆质量难以保证等问题，在震害中出现节点率先损伤退出工作的案例。为此，提出具有节点无拼缝设计思想、干式连接形式的新型装配式组合(耗能)剪力墙结构体系，对其进行抗震性能和设计理论研究。主要研究内容及取得重要结果如下：.1、基于塑性损伤转移设计理念，提出一种“强水平弱竖向”干式节点连接形式的新型装配式混凝土剪力墙结构体系。设计了5个“强水平”连接装配式混凝土剪力墙试件，开展了拟静力加载性能试验，验证了具有塑性损伤转移设计理念的装配式剪力墙结构体系，提出了“五折线”刚度退化简化模型。.2、设计了4个1:3缩尺装配式带耗能连接组合剪力墙，进行了结构性能试验研究，结果表明耗能连接能有效地提高耗能能力，改善模块装配式带耗能连接组合剪力墙的抗震性能。.3、揭示了“强水平弱竖向”干式连接装配式剪力墙结构体系的协同工作机理，建议了关键参数取值范围：墙墩转移高度比取7.7%、纵向钢筋配筋率取0.25%-0.67%、钢连接件锚固深度比取1.2-1.8、剪切连接键刚度比宜小于7.23。.4、建立了“强水平”连接节点本构关系，验证了其应用于整体结构的适用性，建立了精确等效模型，对比了不同装配式剪力墙结构的抗震性能，从整体结构角度验证了所提“强水平弱竖向”连接装配式剪力墙体系的优越性。.项目研究了装配式组合(耗能)剪力墙构件的抗震性能，建立装配式连接的简化分析计算模型，再现装配式结构、构件及其连接的动力响应、内力重分布与塑性损伤累积，给出了“强水平弱竖向”连接装配式混凝土剪力墙结构体系设计原则。研究成果将有助于高层与超高层剪力墙结构体系、框架-剪力墙结构体系、筒体结构体系等实现绿色产业化转型升级，节约人力和物力资源，保护环境，符合可持续的社会发展需求，具有较高的现实和社会意义。