同济大学学报（自然科学版）
同濟大學學報（自然科學版）
동제대학학보（자연과학판）
JOURNAL OF TONGJI UNIVERSITY(NATURAL SCIENCE)
2009年
11期
1428-1433
,共6页
体外预应力%组合梁%畸变失稳%稳定系数%长细比
體外預應力%組閤樑%畸變失穩%穩定繫數%長細比
체외예응력%조합량%기변실은%은정계수%장세비
external prestress%composite beams%distortional buckling%buckling coefficient%slenderness
考虑钢梁初始几何缺陷影响和残余应力影响,对体外预应力组合梁进行了有限元非线性稳定分析,计算结果与试验实测值吻合.通过改变截面参数,对25组组合梁在初始几何缺陷、不同残余应力分布和不同综合力比下的承载力进行计算,给出了预应力组合梁的长细比计算公式,与我国现行钢结构规范钢柱稳定曲线进行了比较.研究表明,承受负弯矩作用的体外预应力组合梁可用文中提出的长细比作参数采用钢柱稳定曲线进行计算.
攷慮鋼樑初始幾何缺陷影響和殘餘應力影響,對體外預應力組閤樑進行瞭有限元非線性穩定分析,計算結果與試驗實測值吻閤.通過改變截麵參數,對25組組閤樑在初始幾何缺陷、不同殘餘應力分佈和不同綜閤力比下的承載力進行計算,給齣瞭預應力組閤樑的長細比計算公式,與我國現行鋼結構規範鋼柱穩定麯線進行瞭比較.研究錶明,承受負彎矩作用的體外預應力組閤樑可用文中提齣的長細比作參數採用鋼柱穩定麯線進行計算.
고필강량초시궤하결함영향화잔여응력영향,대체외예응력조합량진행료유한원비선성은정분석,계산결과여시험실측치문합.통과개변절면삼수,대25조조합량재초시궤하결함、불동잔여응력분포화불동종합력비하적승재력진행계산,급출료예응력조합량적장세비계산공식,여아국현행강결구규범강주은정곡선진행료비교.연구표명,승수부만구작용적체외예응력조합량가용문중제출적장세비작삼수채용강주은정곡선진행계산.
Based on the proposed restrained torsional buckling model, inelastic finite element buckling analysis is made of the composite beams in negative bending with a consideration of the initial geometric imperfection and the residual stress patterns, and the analysis results agree well with the test results. By varying cross-section parameters, 25 groups of composite beams under negative uniform bending with initial geometric imperfection and different patterns of residual stress in steel beams are studied by means of the FE method.The slenderness of the studied beam is defined and the calculated result is compared with the Chinese codified steel column design curves. It is demonstrated that the Chinese codified steel column design curves can be used in the assessment of the buckling strength of composite beams with the slenderness defined.
