单层铰接排架柱二阶效应计算  

CALCULATION OF SECOND-ORDER EFFECT FOR COLUMNS OF HINGED SINGLE-STORY BENT

作　　者：童岳生[1] 车佳玲[2] 梁兴文[1] 童申家[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]宁夏大学土木与水利工程学院,银川750002

出　　处：《工业建筑》2015年第3期76-82,共7页Industrial Construction

基　　金：国家自然科学基金资助项目(51078305;51278402;51408328)

摘　　要：在荷载作用下的单层铰接排架,可通过排架分析求得柱顶剪力。另外,柱顶原来作用有由屋盖重量等引起的压力及弯矩,柱的侧面还可能作用有均匀分布的水平风荷载以及吊车横向水平刹车力等,柱上作用力均为已知。在这些荷载作用下,柱子会发生侧移,又因为柱顶有压力,从而产生二阶效应,在计算中应予以考虑。根据排架柱柱顶及侧面的作用力,考虑柱的重力二阶效应,求取柱顶侧移、柱底弯矩以及柱高范围内截面的最大弯矩。通过对等截面排架柱重力二阶效应的理论分析,得出计算公式。对于单阶变截面排架柱,则将其分为上、下段,根据上、下段联接处的变形协调条件,利用这些公式也可进行重力二阶效应的计算。通过几个排架柱的例题计算表明,提出的计算方法切实可行、简易方便、结果可靠。For hinged single-story bent under action of loads, the shear force at the top of column can be obtained by structural analysis, the compressive load and moment induced from roof weight originally at the top of column are already known.Sometimes, there may be uniformly distributed horizontal wind load or concentrated brake force due to crane, etc on the side face of the column.The top sidesway, moment at the bottom end and the maximum moment at some section of column under the action of various forces considering the gravitational second-order effect were solved, and formulas were obtained through theoretical analysis for bent column with constant section.These formulas could be used for single-stepped bent column by dividing the column into upper and lower segments and considering deformation compatibility at junction of two segments.Calculation examples showed that the proposed method was feasible and the obtained results were reliable.

关 键 词：排架柱 二阶效应 作用力 等截面柱 单阶变截面柱 

分 类 号：TU312.1[建筑科学—结构工程]