受压板肋加劲板整体稳定计算方法  

A Calculation Method of Overall Stability for Flat Plate Stiffened Panels Under Compression

作　　者：赵秋[1] 陈鹏 林志平 张骏超 ZHAO Qiu;CHEN Peng;LIN Zhiping;ZHANG Junchao(School of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Highway Bridge Construction&Development Co.,Ltd.,Xiamen 361000,China;Fujian Highway Engineering Key Laboratory,Xiamen 361000,China)

机构地区：[1]福州大学土木工程学院,福州350108 [2]福建省高速路桥建设发展有限公司,福建厦门361000 [3]福建省高速公路工程重点实验室,福建厦门361000

出　　处：《工业建筑》2024年第10期138-146,共9页Industrial Construction

基　　金：国家自然科学基金资助项目(51478120,51108087)。

摘　　要：板肋加劲板是钢结构桥梁中钢箱、钢塔以及钢拱等结构的基本组成构件,为研究板肋加劲板的整体稳定性能,采用经试验验证的有限元模型进行整体稳定分析,考虑不同本构关系、初始几何缺陷以及焊接残余应力对整体稳定承载力的影响,批量计算得到整体稳定系数拟合曲线。研究发现:采用理想弹塑性本构模型可以较安全地描述板肋加劲板受压整体稳定性能;增大初弯曲与偏心距幅值会削弱板肋加劲板的整体稳定承载力,当缺陷幅值为计算长度的1/1000时,板肋侧初弯曲的模型承载力相对较低,但被加劲板侧初弯曲的模型对缺陷更为敏感;增大焊接残余压应力峰值会降低板肋加劲板整体轴向刚度以及轴向极限平均应力,在所研究的相对长细比范围内,拟合的计算公式曲线低于试验值与等强钢U肋柱子曲线,整体接近JTG D64—2015《公路钢结构桥梁设计规范》中b类柱子曲线,高于日本规范、美国规范对应的柱子曲线,可以偏安全地用于板肋加劲板整体稳定计算。Flat panel stiffened plates are the basic components of steel box,steel tower and steel arch in steel structure bridges.In order to study the overall stability of flat panel stiffened plates,the finite element models verified by experiments were established for overall stability analysis.The effects of different constitutive relations,initial geometric defects and welding residual stresses on the overall stability bearing capacity were considered.It was found that:the ideal elastic-plastic constitutive model could be used to safely analyze the overall stability of flat plate stiffened panel under compression.Increasing the initial bending amplitude and loading eccentricity of the model would weaken the plates’overall stability capacity.When the defect amplitude was 1/1000 of the calculated length,the bearing capacity of model initially bent on the side of the plate rib was relatively low,but the model initially bent on the side of the stiffened plate was more sensitive to the defect;increasing the peak value of welding residual compressive stress would reduce the overall axial stiffness and ultimate average stress of flat plate stiffened panels.Within the range of the relative slenderness ratio studied,the fitted calculation formula curve was lower than the test value and the curve of equal strength steel u-rib column,and was generally close to the class B column curve in the Specifications for Design of Highway Steel Bridge(JTG D64—2015),higher than the column curve corresponding to the Japanese and American codes,which could be safely used for the overall stability calculation of flat panel stiffened plates.

关 键 词：桥梁工程 板肋加劲板 整体稳定 数值模拟 稳定承载力 计算方法 

分 类 号：U441[建筑科学—桥梁与隧道工程]