摘要
将小箱梁横截面取为框架模型,各片小箱梁纵向的抗弯和抗扭刚度等效成弹性支承,利用杆系有限元分析框架在单位移动荷载作用下各片小箱梁(对应为弹性支承)的横向影响线,得到小箱梁的荷载横向分布系数,并与修正的偏心压力法、刚接梁法及空间实体模型等方法的结果进行比较。得到的结果与修正偏心压力法极为接近,与刚接梁法的最大偏差也在5%以内,验证了该方法可行性和准确性。
Taking the small box girder cross-section as a framework model,the longitudinal bending stiffness and torsion stiffness of each small box girder are equivalent to elastic supports, and the finite element is used to analyze the transverse influence line of each small box girder under the action of unit moving load. The transverse distribution factor is obtained and compared with those results of the modified eccentric load method, rigid beam method, special finite element method and other methods. The present results are consistent to that of the modified eccentric load method. Comparing with the rigid beam method, the maximum error of present method is less than 5 %, which proves the feasibility and accuracy of this method.
出处
《交通科学与工程》
2016年第1期54-59,共6页
Journal of Transport Science and Engineering
基金
长沙理工大学土木工程优势特色重点学科创新项目(16ZDXK09)
关键词
小箱梁
荷载横向分布系数
弹性支承框架法
有限元
影响线
small box girder
load transverse distribution factor ~ elastic supporting framemethod
finite element
influence line
