底框结构在倾覆力矩作用下，往往在柱中产生附加轴力，且影响较大，但精确计算困难，现有的计算方法较繁，且未考虑空间协同作用，常导致计算误差较大，本文从空间协同工作入手利用功能原理导出一简化计算公式便于实际应用． Under the effect of the overturning moment, the bottom frame structure often generates additional axial force in the column, which has a great influence, but it is difficult to calculate accurately. The existing calculation methods are more complicated, and space coordination is not taken into consideration, which often leads to larger calculation errors. This paper starts with the space cooperation work and uses the principle of function to derive a simplified calculation formula for practical application.