双肢缀条与缀板格构柱的经济性对比研究

摘要

以单向偏心受压双肢格构柱为研究对象,引入参量柱端压力、压力单向偏心距、柱计算长度、槽钢类型、分肢间距、缀板尺寸与间距、缀条尺寸与布置角度等.变化各参量,验算得到满足《钢结构规范》的缀条与缀板格构柱,对比两者在相同外荷载工况下的最小用钢量.分析表明,缀条柱的经济性随端部压力、压力单向偏心距和柱计算长度的增大而逐渐优于缀板柱；并且当压力和偏心距较大时,柱的计算长度对两者用钢量差值的影响较小.根据荷载工况与经济使用荷载工况边界曲线的关系,可以选用较经济的格构柱形式.研究结果可以指导设计工作中两种形式格构柱的选用.%Double limbs build-up steel columns under one-way eccentric load are studied. The parameters under study are end load, one-way eccentricity, columns' effective length, channel steel type, spacing between limbs, batten plate' s size and space, lacing bar' s size and angle. As the abovementioned parameters vary, latticed columns and battened columns are designed and verified based on Design Code for the Steel Structures. The minimum steel quantities of them are calculated and compared under the identical load condition. Latticed columns are more economic than battened columns as load, eccentricity and columns' effective length increases. In addition , columns' effective length has a little influence on difference of their steel quantities when either load or eccentricity is comparatively larger. The type of build-up steel columns, which is more economic, can be determined by comparing load condition with boundary curve of economical and applicable conditions. The design and application of double limbs build-up steel columns can be contributed.