钢-混凝土组合框架梁的稳定设计方法

在已有的钢-混凝土组合梁和钢框架理论研究基础上,分析了影响组合梁负弯矩区转动能力的主要因素,建立了组合梁连续和钢柱连续两种组合框架结构体系的节点塑性极限转角的求解方法,提出了相应的计算公式及一种简化的组合框架梁稳定设计方法,并得出了组合梁负弯矩极限调幅系数的计算方法.结果表明,该设计方法可以使组合框架塑性铰处的内力充分重分布,使梁柱连接的转动刚度合理,也能使组合梁的设计达到充分利用组合效应及节点延性的目的.

Approach for Design of Stability of Steel-concrete Composite Frame Beam

Based on the theoretical basis of steel-concrete composite beam and composite frame and the analysis of main influencing factors of negative bending moment rotation capacity,authors established an approach for design of stability of composite beams in composite frames and deduced the bending moment amplitude modulation parameter for both beam-continuate and column-continuate composite frames.The corresponding computation formulae were proposed and a simplified stability design method for composite frame beams was introduced.The results show that roational stiffness is designed reasonably by redistributing internal force in plastic hinge of composite frames,and composite action and joint ductility can be used sufficiently.