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结构的竖向刚度是考虑基础和上部结构共同工作的重要参数。考虑上部结构刚度对于减小基础的内力和沉降差以及调整上部结构的内力是不可忽视的。框架结构的竖向刚度是依靠框架梁的抗剪刚度提供的,并随着柱的轴变刚度增加而增强。推导当地基发生非线性变形时,上部框架梁两端的相对竖向变形随高度的衰减系数ψ的计算公式,从而得出框架的竖向刚度及框架结构承受的整体弯矩。对一般规则框架制成ψ值表,可供工程设计应用。
The vertical stiffness of the structure is an important parameter to consider when the foundation and the superstructure work together. Considering the stiffness of the superstructure can not be neglected to reduce the internal forces and settlement differences of the foundation and to adjust the internal forces of the superstructure. The vertical stiffness of the frame structure is provided by the shear stiffness of the frame beam and increases as the axial stiffness of the column increases. The calculation formula of the relative vertical deformation at both ends of the upper frame beam with the height attenuation coefficient ψ is deduced when the nonlinear deformation occurs in the local foundation so as to obtain the vertical stiffness of the frame and the overall bending moment to be borne by the frame structure. The ψ value table is made for the general rules framework and is available for engineering design and application.