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对正弯矩区组合梁腹板局部稳定性进行研究,首先要建立板件在拉、弯、剪共同作用下的相关屈曲方程。该文在前人研究的基础上,根据能量方法研究了四边简支板件在拉、弯、剪共同作用下的弹性相关屈曲方程,并利用通用有限元软件ANSYS建模进行计算,验证了理论推导结果,最终提出简化公式。随后在相关方程的基础上,推导出相应的弹性高厚比限值。并将该限值与未考虑弯拉作用的限值进行对比,结果有明显提高,多数情况下可放宽26%以上。该文成果为进一步研究正弯矩区组合梁腹板考虑残余应力和初始缺陷的弹塑性屈曲提供基础。
To study the local stability of the composite webs in the bending moment zone, we first establish the buckling equation of the panel under the action of tension, bending and shearing. Based on the previous studies, based on the energy method, the elastic-dependent buckling equations of the four-sided simply supported plate under the action of tension, bending and shearing are studied and calculated by the general finite element software ANSYS. The results show that the theory Derive the result, and finally propose a simplified formula. Then based on the correlation equation, derived the corresponding elastic high thickness ratio limit. This limit is compared with the limit without considering the effect of bending and the result is obviously improved. In most cases, it can be relaxed by more than 26%. The results provide the foundation for further study of the elasto-plastic buckling considering the residual stress and the initial defect in the webs of the composite box girder with positive bending moment.