钢管混凝土格构柱力学性能分析-结构工程专业论文.docxVIP

哈尔滨工业大学工学硕士学位论文 哈尔滨工业大学工学硕士学位论文 -II- -II- Abstract Concrete filled steel tubular (CFST) laced columns are widely used in engineering fields. However, the calculation method for the mechanical properties of CFST laced columns exis shortcomings and deficiencies up to now. The current design methods are mainly derived from research results of steel laced columns, and theoretical calculations often do not reflect the own characteristics of CFST laced columns, so the calculation results often exist large errors. Through theoretical analysis and simulation, this article has completed the researches for the equivalent slenderness ratio of CFST laced columns under axial compression, the mechanical properties of joints connecting the columns and column webs, and the lateral properties of laced columns. According to the calculation formula for critical load considering the effects of shear deformation and axial shortening, this article push es the calculation formulas of equivalent slenderness ratio based on the unified theory proposed by Zhong Shantong. The calculation results of this formula is more accurate than others, and it solves the problems that shear deformation is too large for the members of small slenderness ratio, and the calculation formulas in this article are verified based on existing experimental results. This article has completed the research for the mechanical properties of joints connected limbs and webs. During the research, it has analyzed the impacts of joints on column limbs, and deduced a new formula for calculating the ultimate bearing capacity of joints. The formula is based on the ring model assumptions. The proposed capacity formula aims at the damage for column limbs. This article has completed the research for lateral properties of CFST laced columns. It has revised and simplified the original reduction coefficient for stiffness, and got the new stiffness reduction factors for flat belly bars and oblique webs. During the derivation proce