摘要
对于吊车梁,GB 50017—2017《钢结构设计标准》的设计方法中存在两个问题:1)按照GB 50017—2017的方法计算的腹板承压应力仍然比精确有限元值偏小15%和24%(文献[1]);2)钢梁稳定系数比试验数据的95%保证率的数值偏大10%~25%(文献[2-5])。经分析GB 50017—2017揭示了无制动梁的吊车梁设计的又一缺陷:钢梁稳定系数计算基于一个不可能达到的受压边缘屈服弯矩,其值偏大约15%,导致吊车梁稳定计算偏不安全。为此提出了新的稳定系数公式,并与有限元结果进行了对比,精度良好。新的稳定系数计算基于受拉侧塑性屈服达到一定深度、受压边缘刚刚屈服时的弯矩值,该弯矩小于按照弹性计算的受压边缘屈服弯矩,从而使计算结果更加合理。
There are some aspects that need to be improved in design of crane runway girders in GB 50017—2017,for example,1)the bearing stress at the web edge is 15%and 24%smaller than the FEM results;2)the strength reduction factor accounting for the lateral-torsional buckling is 10%~25%greater than available test results in the international literature.This paper reveals another problem that exists in current design method of crane runway girders:the strenth reduction factor is based on an about 15%larger and never-be-attended bending moment.This paper proposed a new stability factor for mono-symmetrical beam,which is based on the bending moment for which the tensile region has already a certain depth of plastification and the compressed edge is just yielding,this moment is smaller than the elastic limit moment based on the sectional modulus of the compressed edge,so as to make the calculation result more reasonable.
作者
童根树
Genshu Tong(Institute of High Performance Structures&Materials,Zhejiang University,Hangzhou 310058,China)
出处
《钢结构（中英文）》
2020年第3期65-73,共9页
Steel Construction（Chinese & English）
关键词
吊车梁
弯扭屈曲
单轴对称截面
crane runway girder
flexural-torsional buckling
monosymmetrical section
