强迫位移式门式刚架的强迫位移量确定方法

Determining method of displacement value of forced displacement portal frame

强迫位移式门式刚架中间设置摇摆柱,在柱顶与斜梁连接处设置强迫位移.不仅摇摆柱限制刚架跨中位移,而且强迫位移量产生的预应力可调节结构在荷载作用下的内力,使得内力分布更为均匀.如何确定强迫位移量是强迫位移式门式刚架的关键问题.文中建立了强迫位移量的确定准则:在竖向荷载的作用下,屋脊弯矩与梁柱连接处或斜梁跨中截面弯矩绝对值相等,构件内力分布达到最均匀状态.依据该准则及结构变形叠加原理,建立了门式刚架的强迫位移量的确定方案及计算公式,为强迫位移式门式刚架的初步设计奠定了理论基础.

Swing column is in the middle of the forced displacement portal frame , and the joint where the column top and inclined beam are connected has forced displacement .Not only displacement of the beam span can be limited by swing column , but also internal force of the structure under load can be adjusted by the pre-stress caused by forced displacement , which made it more evenly distributed .How to Determine standoffs displacement value is a key issue for forced displacement portal frame .Determining criteria for forced displacement value is es-tablished：Absolute value of the column top moment and that of the section moment of the oblique beam ends or oblique beam span are equal;member force is in the evenest distribution state .According to this criterion and structural deformation superposition principle , determining methods and formulas for displacement value of forced displacement portal frame are established , which lays a theoretical foundation for the preliminary design of forced displacement portal frame .