新型板件耗能支撑受力机理及设计方法研究

The concentrically braced steel frame is an effective lateral load resisting system. Due to the buckling of compressive staff, the conventional brace exhibits degraded cyclic behavior when subjected to strong earthquake. In order to improve the brace energy dissipation capacity, this research puts forward an innovative brace dissipated energy by yielded plates, in which all the inelastic deformations are confined within the ends of the braces and the instability of brace is avoided by partial relaxation of the axial force. The experimental research and finite element analysis will be adopted to study the mechanical performance and damage mechanism of the innovative brace. Proposing the construction detail with optimal mechanical properties and the recovery force model used to structure analysis; considering the effect of boundary conditions, exploring the bearing capacity of the dissipating energy plates ,and proposing the formulas for calculating the stability and strength of this brace; the plastic development and internal force distribution of steel frame system braced by this innovative energy dissipation brace will be analyzed, and the best energy consumption patterns of braced steel frame system will be sought; analysing the interaction action between the steel frame and the braces; determining the elasto-plastic story shear distribution along the frame height using the time history analysis; the calculation formula for the effective damping ratio will be deduced. In addition, the capability coefficient of brace，beam，column and jointing nodes will be got; the seismic behavior of designed steel frame with the innovative brace will be evaluated by nonlinear time history analysis, which can provide the reliability and accuracy of the proposed design method for steel frame with the innovative brace, which can provide technical support for the engineering application.

中心支撑钢框架抗侧效率高，应用广泛。但强震下，传统的中心支撑杆容易发生受压失稳，耗能能力严重劣化。为了提高中心支撑杆的耗能能力，本项目提出了一种新型板件耗能支撑，可使强震下的塑性变形集中于支撑端部的耗能区域，避免支撑发生失稳；拟采用试验研究、有限元模拟及理论分析相结合的方法研究板件耗能支撑受力性能和破坏机理、最优力学性能的构造；提出板件耗能支撑的恢复力模型；考虑边界条件，提出板件耗能支撑稳定承载力计算公式；分析耗能板件的受力特点，提出支撑轴向强度和刚度计算公式；明晰板件耗能支撑框架结构的内力分布与塑性发展规律，寻求结构的最佳耗能模式，揭示支撑与框架结构之间的相互作用机理；研究板件耗能支撑框架结构沿高度的弹塑性层剪力分布；推导板件耗能支撑结构附加有效阻尼比计算公式；量化支撑、钢梁、钢柱以及连接的能力系数，提出便于工程应用的抗震设计方法，为工程应用提供技术支撑。

针对强震作用下，传统的中心支撑杆容易发生受压失稳的缺陷提出了一种新型板件耗能支撑。本项目采用试验研究、有限元模拟及理论分析相结合的方法，对板件耗能支撑和板件耗能支撑框架结构的抗震性能与设计方法进行了研究。完成了19个板件耗能支撑试件、23个耗能支撑子结构试件、9榀板件耗能支撑框架结构试件的低周往复加载试验。主要研究了板件耗能支撑及耗能支撑框架结构的滞回性能，耗能支撑稳定承载力、轴向刚度和强度的计算方法，板件耗能支撑框架结构的设计方法。 .本项目研究取得的主要成果：提出了板件耗能支撑的构造形式，系统研究各设计参数对板件耗能支撑滞回性能的影响；找到了影响新型板件耗能支撑破坏机理的关键因素，揭示了耗能支撑构件及板件耗能支撑框架的受力机理、破坏形态、破坏特征和破坏机理；建立了板件耗能支撑恢复力模型；提出了板件耗能支撑稳定承载力和轴向强度的计算公式，得到板件耗能支撑的设计方法；评估了板件耗能支撑框架结构的抗震性能，明晰了板件耗能支撑框架结构的抗震机理；提出板件耗能支撑框架结构的设计方法和抗震构造措施。.已发表研究论文25篇，其中SCI论文3篇，EI论文1篇，CSCD论文8篇，中文核心期刊5篇，会议论文2篇。投稿返修SCI论文2篇；申请国家专利4项，授权发明专利1项，授权实用新型专利2。完成了项目申请书的研究计划、研究内容、研究目标和预期成果。