初始扭转梁力学性能参数分析  

Parametric analysis on mechanical properties of pre-twisted beam

作　　者：黄莺[1] 陈昌宏[2] 单建[3] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西北工业大学力学与土木建筑学院,陕西西安710129 [3]东南大学土木工程学院,江苏南京210096

出　　处：《四川建筑科学研究》2012年第5期1-4,共4页Sichuan Building Science

基　　金：国家自然科学基金项目(50678036)

摘　　要：根据作者先前对初始扭转梁的变形规律和基本微分方程的讨论,进一步研究初始扭转角和抗弯刚度比两参数对初始扭转梁力学性能的影响。研究表明:由于初始扭转角的存在,梁单向弯曲时将产生侧向位移。且当初始扭转角ω∈[0,π/2],由于耦合效应产生的侧向位移随着初始扭转角ω的增加而增加;当初始扭转角ω∈[π/2,π],由于耦合效应产生的侧向位移随着初始扭转角ω的增加而减少。变化抗弯刚度比参数时,研究表明:截面为正方形,即两主轴方向的抗弯刚度相等时,梁的力学性能与普通直梁相同,无侧向位移产生;而当梁截面为非正方形,即梁截面抗弯刚度比μ≠1时,由于初始扭转角的存在,梁单向弯曲时将产生侧向位移,且μ越大,梁的两弯曲主轴位移耦合效应越来越大,产生的侧向位移也越来越大。According to the author prior to the pre-twisted beam the discussion of the basic deformation and differential equations,the paper studies mechanical properties of pre-twisted beam on parameters-pre-twisted angle and bending stiffness ratio.Research indicates：the beam has lateral displacements as the presence of the pre-twisted angle.What＇s more,the present lateral displacement would increase because of coupling effect when the pre-twisted angle belongs to ,but the present lateral displacement would reduce when the pre-twisted angle belongs to .When the bending stiffness ratio parameter changes,research indicates the pre-twisted beam is the same as ordinary straight beam in mechanics properties only when the beam section is square,namely,the flexural rigidity is equal in two principal axes.But as the beam section is not square,namely,the flexural rigidity is not equal in two principal axes;the pre-twisted beam would present the lateral displacement.What＇s more,the coupling effect increasing and present lateral displacement also growing as the bending stiffness ratio increasing.

关 键 词：梁 力学性能 扭转角 抗弯刚度比 耦合效应 

分 类 号：TU318[建筑科学—结构工程]