| 扁平超宽连续箱梁桥空间受力性能分析与研究 |
| Analysis and Research on Spatial Mechanical Performance of Flat Super Wide Continuous Box Girder |
| 投稿时间：2015-09-27 |
| 中文关键词:超宽箱梁 空间效应 剪力滞 纵向裂缝 |
| 英文关键词:super wide box girder spatial effect shear lag effect longitudinal crack |
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| 中文摘要: |
| 扁平超宽箱梁桥由于具有较大的宽跨比，其受力性能呈现明显的空间效应，通常的单梁模型计算已不能满足设计的精度要求，主要体现在宽箱梁各腹板纵向受力的差异性以及明显的剪力滞效应，同时由于大宽跨比使得横向预应力的作用不仅增加了顶板的压应力，也使得整体箱梁截面下缘出现拉应力，造成边腹板底部纵向裂缝，这些都给宽箱梁的设计带来了不利。因此为研究宽箱梁的空间效应，本文运用ANSYS有限元软件建立了全桥实体模型，计算了各腹板纵向受力差异及剪力滞效应，以及横向预应力对箱梁横向受力的影响，得到了一些有益的结论，为设计人员提供一定的参考。 |
| 英文摘要: |
| Due to the large width span ratio,the mechanical performance of flat super wide box girder bridge shows significant spatial effects. The common single beam model cannot fit the requirements of calculation accuracy mainly in the differences of webs' longitudinal forces and in the shear lag effect.Meanwhile, the transverse prestress not only increases the compressive stress of upper plates, but also induces the tensile stress of bottom plates which may cause longitudinal crack on the bottom of webs. These are unfavorable points for the design of wide box girder.To study the spatial effect of wide box girder, a full bridge model was formed with solid elements by ANSYS. The difference between the longitudinal forces of webs was analyzed as well as the shear lag effect.The effect of transverse prestress on box girder was also studied. Some useful conclusions are obtained which could provide references for designers. |
| 李贵峰.扁平超宽连续箱梁桥空间受力性能分析与研究[J].石家庄铁道大学学报：自然科学版,2016,(4):16-20,89. |
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