分层装配支撑钢框架的地震响应机理与性态控制研究

Motivated by recent trends of industrial construction and seismic resilience of building structures, the seismic performance of an innovative floor-by-floor assembled steel braced framing system composed of the beam through frame by bolted connections and replaceable slender bracings will be studied in this project, whose feature is easy damage repair and low residual deformation. The earthquake response evolutionary process of the steel framing system will be investigated from damage free stage, damage control stage, damage repair stage till damage propagation stage. By means of theoretical study, numerical analysis and shaking table test, damage distribution and development, deformation behavior, residual displacement characteristics as well as self-centering mechanism under dynamic loads will be revealed. Refined hysteretic model will be constructed, and the changing rule of energy balance pattern and the story drift control principle will be discovered. The optimal layout philosophy and design method of structural elements will then be proposed to achieve preset behavior control objectives based on energy principle. One of research emphasis is to consider the coupling of nonlinear vibration characteristics of structures and spectral characteristics of ground motion, exploring a new behavior control strategy applying to resilient structures with nonideal elastoplastic hysteretic properties. This research aims to promote the development of seismic design theory and technology of low-to-middle-rise prefabricated building structures, and enhance their collapse resistance and seismic resilience under strong earthquakes.

本项目着眼于建筑结构工业化建造和抗震性能提升为功能可恢复的发展趋势，研究由梁贯通式全螺栓连接框架和可更换柔性支撑构成、具有损伤易修和低残余变形特征的新型分层装配支撑钢框架体系抗震性能。研究地震作用下钢框架从无损伤状态，损伤控制状态，损伤修复状态，至损伤超越状态的演化全过程，综合理论研究、数值分析和振动台试验，揭示结构动力损伤机制、变形性态、残余位移特性和自复位机理，构建精细化滞回模型，探明能量平衡模式的变化规律和层间位移响应的控制原理。提出基于能量准则实现预设性态控制目标的结构要素优化配置原则和设计方法，重点考虑结构非线性振动特性与地震动频谱特性的耦合作用问题，在具有非理想弹塑性滞回特征的可恢复结构性态控制策略方面探索新的路径。研究成果将促进低多层装配式建筑结构抗震设计理论与技术的发展，提升强震作用下的抗倒塌和可恢复性能。

本项目着眼于建筑结构工业化建造和抗震性能提升为功能可恢复的发展趋势，深入研究了由梁贯通式全螺栓连接框架和可更换柔性支撑构成、具有损伤易修和低残余变形特征的新型分层装配支撑钢框架体系抗震性能。系统考察了地震作用下分层装配支撑钢框架从无损伤状态，损伤控制状态，损伤修复状态，至损伤超越状态的演化全过程，综合运用理论研究、数值分析和振动台试验等手段，揭示了结构动力损伤机制、变形性态、残余位移特性和自复位机理，构建了精细化滞回模型，探明了能量平衡模式的变化规律和层间位移响应的控制原理，提出了基于能量准则实现预设性态控制目标的结构要素优化配置原则和设计方法。重点考虑了结构非线性振动特性与地震动频谱特性的耦合作用问题，在具有非理想弹塑性滞回特征的可恢复结构性态控制策略方面探索了新的路径。研究成果促进了低多层装配式建筑结构抗震设计理论与技术的发展，提升了强震作用下的抗倒塌和可恢复性能。

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