Abstract : introducing the current and past research situation of the load carrying capacity of column made of the concrete filled steel tube including its constitutive relationship and the calculation of its load carrying capacity under both simple and complicated stresses state 文摘:综述了国内外对钢管混凝土柱承载力计算的历史和现状，其主要内容包括圆形钢管混凝土的本构关系，单一应力及复杂应力状态下的承载力计算。
The aim of this paper is to relate structural inherent characteristic with exterior excitation , to wield experimental mode analysis technique and structure intension theory in order to separate structural leading mode under practical work state on base of spectrum analysis of exterior excitation and identification each rank mode parameter of structure . sequentially , the issue of space complex stress state in effect of static and dynamic coupling transforms into the issue of simple stress state ( under mode form ) in reciprocal effect of each rank mode in order to analyze structural dynamical intensity 将结构本身的固有特性和外部激励联系在一起，运用实验模态分析技术和结构强度理论，在对外部激励进行谱分析和识别出结构各阶模态参数的基础上，分离出实际工作状态下结构的主导模态，从而将一静动耦合力作用下的空间复杂应力状态问题转化为各阶模态相互作用下的简单应力状态(模态形态下)问题进行结构动强度分析。
Under the complex loadings , the surface flaws of large complex structures and the original defects of materials would initiate the propagation of micro three - dimensional ( 3d ) cracks , and result in catastrophic accidents . for the limitations of the traditional theories of two - dimensional cracks , the safety of actual structures containing 3d cracks cannot be guaranteed completely without the out - of - plane stress constraint 复杂应力作用下,宏观复杂结构表面加工质量和材料本身固有缺陷以及外来损伤等会引起三维裂纹的萌生、扩展,最终导致灾难性的破坏,而传统二维裂纹理论在解决实际三维裂纹问题时出现不足,无法完全保障结构安全。
