基于多尺度和相关性的钢管混凝土柱节点半刚性计算模型及其框架体系研究

传统的钢管混凝土节点及框架进行模拟分析时，主要采用杆系模型和实体模型，而很少应用多尺度模型；在进行试验分析时，忽略了试件不同比例模型的非完全相似所引起的误差；在理论分析时，均是基于参数完全确定的假设，忽略了各影响因素间的相互作用对结果的影响。综合考虑以上弊端，基于结构多尺度力学和相关性，使得宏观模型与微观模型协同计算，更好把握结构的整体受力特征和微观破坏过程，为工程实际提供更为准确的参考依据。. 申请者在青年基金项目成果的基础上，拟开展基于结构多尺度力学和参数间相关关系对钢管混凝土柱节点进行不确定性灵敏度分析，提出钢管混凝土柱节点半刚性计算模型，并引入钢管混凝土框架体系中，进行框架体系力学性能（静力、拟静力以及地震模拟振动台等）的试验、数值计算与理论分析研究，同时对结构设计软件进行改进研究和二次开发，将研究结果应用到结构设计软件中，使工程师准确地进行钢管混凝土梁柱节点设计。

In traditional simulation analysis for concrete-filled steel tubular (CFST) joint and framework, the truss model and the solid model was usually used, the multi-scale model was rarely used. In test analysis, the error generated by non-full-similar scale model was usually neglected. In theoretical analysis, a parameter is focused on studying on structure response, the other parameters were fixed on their basic values, and the effect of correlations between the variables was ignored. Considering the above drawbacks, the collaborative computing was carried on between the macro model and micro model through appropriate connections based on multi-scale mechanics of structures and correlation. The overall mechanical characteristics and micro destruction process of structure was better grasped and provided a more accurate reference for engineering practice..Based on study outcomes of the Youth Science Fund project provide by NSFC, the deterministic sensitivity analysis was carried out for CFST joint considering multi-scale mechanics of structures simulation and the correlative relationships between parameters. The semi-rigid practical computing model of CFST joint was put forward. With the semi-rigid practical computational model, the test analysis, the numerical calculation and the theoretical analysis of mechanical properties (static, pseudo static and earthquake simulation shaking table, etc.) of the overall framework system were carried out. The structural design software was improved and secondly developed. The research results were applied to the structural design software, and the design of CFST beam-column joints could be carried on accurately by the engineers.