以往求框架结构临界荷载的方法,都是假定杆件轴力与外力成比例变化。但是当框架结构受有横向荷载作用时,由于P-△效应,轴力与外力不是成比例变化的。本文由此提出新的框架结构求临界荷载的方法,并和通常的方法做了比较,在理论上比较完善,也有实用意义。 In the past, the method of calculating the critical load of the frame structure was based on the assumption that the axial force of the rod member changes in proportion to the external force. However, when the frame structure is subjected to a lateral load, the axial force does not change in proportion to the external force due to the P-Δ effect. This paper proposes a new method for determining the critical load of the frame structure and compares it with the usual methods. It is relatively perfect in theory and has practical significance.