摘要
针对钢板梁桥两类腹板间隙面外变形疲劳细节(竖向加劲肋腹板间隙细节和水平节点板腹板间隙细节),建立了三跨连续钢板梁直桥、斜桥和弯桥的有限元模型,通过数值模拟对不同跨径、不同斜交角、平曲线半径钢板梁桥腹板间隙疲劳细节的面外变形及疲劳应力进行研究,并针对斜桥和弯桥进行了面外变形疲劳效应参数分析。模拟结果表明:疲劳车辆荷载作用下腹板间隙细节会产生相对面外变形和疲劳应力;直桥中竖向加劲肋腹板间隙细节的面外变形、疲劳应力峰值分别为0.079 mm、105.6 MPa,水平节点板腹板间隙细节的面外变形、疲劳应力峰值为0.006 mm、10.9 MPa;斜桥、弯桥中两类腹板间隙细节的面外变形疲劳效应显著大于直桥,相对面外变形量更大,斜桥、弯桥中竖向加劲肋腹板间隙细节的疲劳应力峰值分别为直桥的2.4倍和1.7倍,水平节点板腹板间隙细节的疲劳应力峰值分别为直桥的2倍和2.9倍;疲劳细节处的相对面外变形与疲劳应力水平具有较强的相关性,且很小的相对面外变形就可以引起较高的拉应力。在斜桥中,水平节点板腹板间隙细节的腹板间隙处仅0.15 mm的相对面外变形就能引起约250 MPa的竖向弯曲拉应力。参数分析结果表明,斜桥中疲劳细节处的应力随斜交角的增大而增大,弯桥中细节处的疲劳应力随平曲线半径的减小而增大。跨径布置为(45+70+45)m的直桥中,竖向加劲肋腹板间隙细节和水平节点板腹板间隙细节处的最大拉应力105.6 MPa和10.9 MPa。相同跨径斜桥、弯桥中对应细节处的最大拉应力分别为250.5 MPa和21.8 MPa、176.5 MPa和31.9 MPa,显著大于相同跨径直桥中对应细节处的最大拉应力。
For two type of distortion-induced fatigue details at web gaps(vertical stiffener web gap and horizontal gusset plate web gap)in the steel plate girder bridges,finite element models of the straight,skewed and curved three-span continuous steel plate girder bridges were built.The out-of-plane distortion and fatigue stress of the web gap fatigue details of steel plate girder bridges with different spans,oblique angles and horizontal curve radius are investigated by numerical simulation.Parametric analysis of fatigue effect in skewed and curved bridges is carried out.The simulation results show that when under the vehicle loads,the relative out-of-plane deformation and fatigue stresses will occur at the web gap details.The relative out-of-plane distortion and the peak fatigue stress of the vertical stiffener web gap details in the straight bridge are 0.079 mm and 105.6 MPa;the relative out-of-plane distortion and the peak fatigue stress of the horizontal gusset plate web gap details in the straight bridge are 0.006 mm and 10.9 MPa.The distortion-induced fatigue effects of two types of web gap details in the skewed bridge and the curved bridge are significantly greater than that of the straight bridge,and the out-of-plane distortions are larger than that of the straight bridge.The peak fatigue stress of vertical stiffener web gap in the skewed bridge and the curved bridge are 2.4 times and 1.7 times as much as that in the straight bridge;the peak fatigue stress of horizontal gusset plate web gap in the skewed bridge and the curved bridge are 2 times and 2.9 times as much as that in the straight bridge.The relative out-of-plane deformation of the fatigue details has a strong correlation with the stress level at the fatigue details,and small relative out-of-plane deformation can cause high fatigue stress.In skewed bridges,only 0.15 mm relative out-of-plane distortion at the horizontal gusset plate web gap details can cause 250 MPa vertical bending tensile stress.Parametric analysis results show that the fatigue stress at details in skewed bridge increases with the increase of oblique angle,while the stress at fatigue details in curved bridge increases with the decrease of horizontal curve radius.In the straight bridge with a span arrangement of(45+70+45)m,the maximum tensile stresses at the vertical stiffener web gap details and the horizontal gusset plate web gap details are 105.6 MPa and 10.9 MPa.The maximum tensile stresses at the corresponding details in the skewed bridge and curved bridge with the same span are 250.5 MPa and 21.8 MPa,176.5 MPa and 31.9 MPa,respectively,which are significantly greater than the maximum tensile stress at the corresponding details in the straight bridge with the same span.
作者
王雨竹
舒畅
王鹏
周星光
王春生
Yuzhu Wang;Chang Shu;Peng Wang;Xingguang Zhou;Chunsheng Wang(College of Highways,Chang’an University,Xi’an 710064,China)
出处
《钢结构（中英文）》
2021年第10期7-15,共9页
Steel Construction（Chinese & English）
基金
国家“万人计划”科技创新领军人才支持项目(W03020659)
国家自然科学基金项目(51578073)。
关键词
钢板梁桥
面外变形
疲劳
斜交角
平曲线半径
steel plate girder bridge
out-of-plane distortion
fatigue
oblique angle
horizontal curve radius
