斜交连续钢箱梁桥横隔板布置方式研究

摘要

Research purposes:The orthogonal cross beam is benefit to the load transferring and construction assembling for the skew continuous steel -box girder bridge.In order to optimize this diaphragm arrangement further by simplifying the structure of the support point,a novel diaphragm arrangement idea was presented in this paper through canceling the inclined diaphragm at the support points of the middle pier.Then the feasibility of this idea was studied and verified. Research conclusions:(1 )Taking a (30 +35)m skew continuous steel -box girder as the engineering background,the finite shell element models of whole bridge were established.The calculated results show that this novel diaphragm arrangement can meet the design requirement both in the two aspects of the structure global mechanical behavior and local stress.(2)Compared with the oblique crossing diaphragm arrangement,the structure mechanical behavior has little difference regardless of the diaphragm arrangement is adopted when the skew angle is less.(3)By optimizing the structure details of the novel diaphragm arrangement further,its adaptability in the skew continuous steel -box girder bridge with large hollow box section and large skew angle was discussed.(4)The conclusions could provide some theoretical reference for the diaphragm design of the skew continuous steel -box girder bridge.%研究目的：对于斜交连续钢箱梁桥，正交横隔板有利于荷载横向传递和施工拼接。为简化结构在支点处的构造以进一步优化该横隔板布置方式，本文取消中间墩支点处斜横隔板，在此基础上提出一种新的横隔板布置方式概念，并研究和验证其可行性。研究结论：（1）以某（30＋35）m 跨斜交连续钢箱梁桥为工程背景，采用通用有限元软件建立了全桥板壳单元模型，计算结果表明，采用本文提出的横隔板布置方式，结构整体受力性能与局部应力均满足设计要求；（2）当斜交角度较小时，横隔板正交布置或斜交布置的结构受力差别不大；（3）通过进一步优化构造措施，讨论了该种新型横隔板布置方式在大箱室和大斜交角的钢箱梁桥上的适用性；（4）本研究结论可为斜交连续钢箱梁的横隔板的设计提供部分理论参考。