铝合金结构构件滞回性能研究

Even to this day, it is not studied sufficiently about the seismic behaviors of aluminium structures, which is contradictory with plenty of use of the structures. This project is aimed at investigating the hysteretic behaviors of aluminium members subjected to cyclic loading, trying to build up the hysteretic models of aluminium members, and suggesting the appropriate seismic design criterions. Quasi-static testing will be conducted on aluminium columns, beams and beam-columns by cyclic loading, and the hysteretic behaviors and the damage mechanisms of the specimens will be investigated. According to the hysteretic curves of the specimens, the influences of Baushinger effects and strain hardening to the hysteretic constitutive relation of aluminium material will be analyzed. Meanwhile, the hysteretic model of aluminium material considering accumulated damage under cyclic loading will be developed. Based on considering material nonlinearity, geometrical nonlinearity and initial defects, numerical models and analytical methods will be confirmed. Based on tests and parameter analyses, the influences of parameters to the hysteretic behaviors of aluminium columns, beams and beam-columns will be investigated, and the ductility factors will be obtained. Then, moment-curvature and load-deformation hysteretic models on the basis of material characteristics of aluminium will be developed, and the values of factors among the models will be confirmed. Finally, some specific seismic design suggestions will be given. The research results have important value to the study of the seismic behavior of aluminium structures, which lay favorable foundations for elastoplasticity seismic response analysis of aluminium structures.

时至今日，对铝合金结构抗震性能的研究还很不充分，这与铝合金结构的应用现状较不相符。本项目从铝合金构件在循环荷载作用下滞回性能的系统研究着手，力求建立铝合金构件的滞回模型，并提出合理的抗震设计对策。进行铝合金轴压构件、受弯构件和压弯构件的循环加载拟静力试验，考察铝合金构件的滞回特性及破坏机理；根据实测滞回曲线，分析包兴格效应、强化等对铝合金滞回本构关系的影响，并确定循环荷载作用下铝合金材料的滞回模型；在考虑双重非线性和初始缺陷的基础上，采用数值方法建立铝合金构件滞回性能研究的分析模型和分析方法；在试验和参数分析的基础上，考察各设计参数对铝合金轴压构件、受弯构件和压弯构件滞回性能的影响，确定基于铝合金材料特性的弯矩-曲率滞回模型、荷载-变形滞回模型以及模型中各参数的取值，并给出具体的抗震设计建议。研究成果对铝合金结构抗震性能研究具有重要价值，为进行铝合金结构弹塑性地震反应分析打下了良好的基础。

与传统结构材料相比，铝合金具有可模性好、耐腐蚀等特点，铝合金结构在土木工程中的使用越发广泛，但其抗震性能等的研究还很不充分，制约了铝合金结构的进一步推广应用。本项目进行了铝合金构件的循环加载拟静力试验，确定了其滞回特性及破坏机理。根据实测滞回曲线，分析了Bauschinger效应、强化等对铝合金滞回本构关系的影响，并确定了循环荷载作用下铝合金材料的滞回模型。对试验进行的机理分析发现，试件均表现出明显的Bauschinger效应和循环强化。在考虑Bauschinger效应以及包含等向强化和随动强化的混合强化效应的基础上，采用数值方法建立了铝合金构件滞回性能研究的分析模型和分析方法。在试验和参数分析的基础上，确定了各设计参数对铝合金构件滞回性能的影响，最终建立了基本构件的滞回模型。研究结果显示，铝合金类型对构件的滞回性能有显著影响，建议了不同合金类型的混合强化参数的取值。研究成果对铝合金结构抗震性能研究具有重要价值，为进行铝合金结构弹塑性地震反应分析打下了良好的基础。