矩形钢管柱和混凝土弹簧刚度系数方程拟合研究

RESEARCH OF SPRING RIGIDITY COEFFICIENT EQUATION FITTING FOR RECTANGULAR STEEL TUBE COLUMN AND CONCRETE

在矩形钢管混凝土柱内部设置传力构件以解决现有的钢管混凝土柱钢管与混凝土难以共同受力的问题。将弹性地基梁理论合理应用到设置传力构件的钢管混凝土柱,采用解析法求解混凝土工作承担系数时,钢管竖向弹簧刚度、钢管转动弹簧刚度、混凝土竖向弹簧刚度至关重要。3个弹簧刚度的求解均采用有限元法,对于实际工程的应用,比较繁琐不直观,且有一定难度。定义钢管竖向弹簧刚度系数、钢管转动弹簧刚度系数、混凝土竖向弹簧刚度系数,通过有限元模拟分析3个弹簧刚度系数的影响因素,分别得出各因素与3个弹簧刚度系数的拟合方程。考虑各因素间的耦合作用,修正拟合方程,回归总拟合方程,并进行误差分析。结果表明,3个弹簧刚度系数拟合总方程有效地解决了弹簧刚度的求解,为进一步求解混凝土工作承担系数提供了可靠的依据。

Setting transmission member in concrete-filled rectangular steel tube （CFRST） column has solved the problems that steel tube and concrete is difficult to work together for existing CFRST. The elastic foundation beam theory was applied to concrete-filled steel tube column of setting transmission component, when solving the coefficient of concrete work by analytical method, vertical spring stiffness of steel tube, rotational spring stiffness of steel tube, vertical spring stiffness of concrete were critical. Their solutions were obtained by the finite element method, which was more complicated and non-intuitive for practical engineering applications, moreover, was also a certain difficulty. Defining vertical spring stiffness coefficient of steel tube, rotational spring stiffness coefficient of steel tube and vertical spring stiffness coefficient of concrete, and using the finite element simulation, it was analyzed the various factors of three spring stiffness coefficients, and obtained the relationships between all influencing factors and three spring stiffness coefficients respectively. Considering the coupling effect between various factors, it was modified the fitting equations and had the total fitting equation, and the error analysis was done. The results showed that the total fitting equation of the three spring stiffness coefficients solved solution of the spring stiffness effectively, and provided a reliable basis for the further solution of the concrete work-bearing factor.