赵秋++杨明++翟战胜++王捷

摘要：为了掌握受压U肋加劲板的局部稳定受力性能，考虑残余应力与初始几何缺陷，建立U肋加劲板局部稳定试验试件的有限元模型，通过考虑不同宽厚比的试验验证该数值模拟方法的正确性；将U肋加劲板及其腹板简化为四边简支板，并通过数值模拟方法验证四边简支板简化模型的正确性。结果表明：采用数值模拟方法计算得到的破坏模态和应力位移曲线与试验曲线吻合较好，所计入的残余应力和几何缺陷大小是合理的；采用简化的四边简支板模型和试验试件模型计算的应力位移曲线从开始到峰值吻合较好，在下降段四边简支板模型下降斜率有所增大；在分析受压U肋加劲板受力性能时，可以选用等效四边简支板简化模型分析其局部稳定承载力。

关键词：U肋加劲板；数值模拟；破坏模式；应力位移曲线；等效模型

中图分类号：TU443.3文献标志码：A

Numerical Simulation of Local Stability Mechanical Behavior of

Urib Stiffened Plate Under CompressionZHAO Qiu1， YANG Ming1， ZHAI Zhansheng2， WANG Jie3

（1. College of Civil Engineering， Fuzhou University， Fuzhou 350108， Fujian， China； 2. Huzhou Traffic & Plan

Design Institute， Huzhou 313000， Zhejiang， China； 3. Guizhou Road & Bridge Group Co.， Ltd.，

Guiyang 550001， Guizhou， China）Abstract： In order to grasp the local stability mechanical behavior of Urib stiffened plate under compression， considering the residual stress and initial geometric imperfection， the finite element model of Urib stiffened plate local stability test specimen was established. The correctness of the numerical simulation method was verified by tests considering different widthtothickness ratios. The Urib stiffened plate and its web plate were simplified as quadrilateral simply supported plate， and the validity of the simplified model was verified by the numerical simulation method. The results show that the failure modes and loaddisplacement curves calculated by numerical simulation method agree well with the test results， the calculated residual stress and geometric imperfection are reasonable. The loaddisplacement curves of the simplified quadrilateral simply supported plate model and the test specimen are in good agreement from the beginning point to the peak， while the descending slope of quadrilateral simply supported plate model increases. Therefore， the equivalent quadrilateral simply supported plate simplified model can be chosen to analyze the local stability mechanical behavior of Urib stiffened plate under compression.

Key words： Urib stiffened plate； numerical simulation； failure mode； loaddisplacement curve； equivalent mode

0引言

帶U肋的加劲板由于其抗扭性能好、刚度较大、用钢量和焊接量少、屈曲稳定性能好等优点经常作为扁平钢箱梁的顶底板[13]。当前研究主要集中在U肋与钢桥面板间焊缝的疲劳性能[47]，而U肋加劲板的稳定问题也是实际应用中的一个难题。吴冲等[8]为验证苏通大桥钢箱梁设计的安全性，截取钢箱梁顶底板节段的U肋加劲板按1∶2.5的比例缩尺，进行了抗压承载力试验，得到了U肋加劲板试件的抗压极限承载力。Chou等[9]以旧金山—奥克兰海湾大桥为背景，对U肋加劲板的设计强度进行了检验，但此试验是针对U肋加劲板的整体稳定，对U肋加劲板的局部稳定没有进行深入分析。……