新型异形钢管混凝土节点充分利用钢材和混凝土两种材料的优点，同时在施工过程中钢管可作为浇灌其核心混凝土的模板。为了进一步推广异形柱结构在高层建筑以及抗震设防高烈度区的应用，本课题研究基于性能的新型异形钢管混凝土节点多尺度地震损伤模型及优化设计方法。通过试验研究获得该类节点的损伤破坏特征和损伤性能，建立同时考虑变形和累积滞回耗能的节点地震损伤模型和节点域钢板焊缝损伤模型。在材料本构关系和节点桁架-塑性铰损伤分析模型的基础上，建立复杂受力状态下节点基于性能的由材料尺度损伤向构件尺度损伤迁移演化的理论模型。在试验和理论研究的基础上确定节点的性能指标、损伤变量及其约束条件，建立新型异形钢管混凝土节点考虑多参数影响的、基于性能的多目标优化设计理论。

The joint consisting of new type concrete-filled steel tubular special-shaped columns and steel beams fully develops the merits of steel and concrete, has the advantage of uncomplicated reinforcement disposing and convenience in construction. To further expand the scope of application of special-shaped column structural system in high-rise and high-intensity area, the present project investigates performance-based multi-scale seismic damage model and optimization design of joint consisting of new type concrete-filled steel tubular special-shaped columns and steel beams. The failure characteristics and damage performance of the joint should be analyzed in the test results. Then, seismic damage model considering the influence of the deformation of the joint and the damage accumulation on the joint would be derived, and the damage model of weld of the joint would be obtained. Based on the constitutive model of material and the steel truss-plastic hinge model of the joint, the performance-based theoretical model in complex stress field, which could reflect migration and evolution law from material damage to member, would be established through the reasonable inference. Based on the experimental and theoretical research, performance objective, damage variables and restraint condition of the joint could be established, and would be developed to provide the performance-based theoretical guidance of multi-objective optimization of joint consisting of new type concrete-filled steel tubular special-shaped columns and steel beams.