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工程科学与技术:2022,54(6):146-156
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钢腹杆PC组合梁桥抗弯性能
(1.福州大学 土木工程学院,福建 福州 350116;2.工程结构福建省高校重点实验室,福建 福州 350116;3.福建省土木工程多灾害防治重点实验室,福建 福州 350116)
Bending Performance of Prestressed Concrete Composite Girder Bridge with Steel Truss Webs
(1.School of Civil Eng., Fuzhou Univ., Fuzhou 350116, China;2.Fujian Key Lab. of Eng. Structures, Fuzhou 350116, China;3.Fujian Provincial Key Lab. on Multi-Disasters Prevention and Mitigation in Civil Eng., Fuzhou 350116, China)
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投稿时间:2021-11-11    修订日期:2022-09-22
中文摘要: 为研究钢腹杆预应力混凝土(PC)组合梁桥的抗弯性能,开展了钢腹杆PC组合梁桥模型试验,研究了钢腹杆PC组合梁桥混凝土顶底板应变与主梁变形等随荷载的变化规律,揭示了组合梁桥弯曲应变沿截面高度的分布规律,得到了组合梁桥的破坏模式;进行了钢腹杆PC组合梁桥有限元参数分析,探讨了主梁高跨比和偏载效应对钢腹杆组合梁桥抗弯性能的影响;提出钢腹杆PC组合梁桥截面开裂弯矩、钢筋屈服弯矩和极限弯矩计算方法。结果表明:钢腹杆PC组合梁桥的破坏过程包括弹性阶段、开裂弹性阶段、弹塑性阶段和失效阶段。在弹性阶段和开裂弹性阶段,钢腹杆PC组合梁桥截面顶底板变形满足“平截面假定”。钢腹杆PC组合梁桥加载过程未出现节点破坏和钢腹杆局部屈曲破坏现象,最终因变形过大而失效,整体受力性能良好。当高跨比在1/16.25~1/9.00之间时,钢腹杆PC组合梁桥跨中截面的变形与应力随高跨比的增大而减小;且当高跨比大于1/11.50时,跨中截面变形与应力减小的趋势变缓。对于自重较小的钢腹杆组合梁桥,偏载钢腹杆PC组合梁桥变形与应力的影响较大,变形与应力增大系数随高跨比的增大而增大;在考虑主梁恒载效应时,变形与应力增大系数分别介于1.083~1.231和1.074~1.178。与有限元和试验结果相比,本文提出的钢腹杆PC组合梁桥开裂弯矩、钢筋屈服弯矩和极限弯矩计算方法的误差小于11.2%,具有较高精度。
Abstract:To study the flexural behavior of prestressed concrete (PC) composite girder bridge with truss webs, the model test of PC composite girder bridge with truss webs for the flexural behavior was conducted. To acquire the failure mode of PC composite girder bridge with truss webs, the changed rule of the strain in the bottom and top slab, and the deflection of the girder of PC composite girder bridge with truss webs with the variation of the load were studied. Meanwhile, the distribution rule of bending strain along the height of the section was revealed. The influence of height-span ratio, and unbalance loaded on the flexural behavior of PC composite girder bridge with truss webs was analyzed, and the calculation method for the cracking bent moment, the bent moment in the stage of the rebar yield, and ultimate bent moment of PC composite girder bridge with truss webs were put forward. The research result shows that the failure process of PC composite girder bridge with truss webs includes the elastic stage, cracking elastic stage, elastic-plastic stage, and failure stage. In the elastic stage and cracking elastic stage, the deflection of the bottom and top slab of PC composite girder bridge with truss webs met the plane-section assumption. During the loading process, there is no joint failure and local buckling failure of the truss web in the PC composite girder bridge with truss webs, Finally, the composite beam fails due to excessive deformation, and the overall mechanical performance is good. When the height-to-span ratio is between 1/16.25 and 1/9.00, the deflection and stress in the mid-span section of PC composite girder bridge with truss webs decrease with the increase of height-span ratio. When the ratio of height to span is greater than 1/11.50, the decreasing trend of deformation and stress in the mid-span section becomes slow. Since the PC composite girder bridge with truss webs had a lesser dead load, the unbalance loaded had a significant influence on the deflection and stress of the composite girder, and the magnification factors of the deflection and stress increased with the increase of height-span ratio. When considering the dead load effect of the main beam, the deformation and stress increase coefficients are 1.083~1.231 and 1.074~1.178, respectively. Compared with the results of finite element analysis and test, the calculation methods of the cracking moment, reinforcement yield moment and ultimate moment of PC composite beams with steel truss web presented in this paper have high accuracy.
文章编号:202101130     中图分类号:U443.35    文献标志码:
基金项目:国家重点研发计划项目(2017YFE0130300);国家自然科学基金项目(52078137);福建省自然科学基金杰青项目(2019J06009)
作者简介:第一作者:陈康明(1985-),男,副研究员,博士.研究方向:组合结构.E-mail:chen-kang-ming@163.com;通信作者:吴庆雄,研究员,E-mail:wuqingx@fzu.edu.cn
引用文本:
陈康明,罗健平,吴庆雄,陈宝春,蔡芬芳.钢腹杆PC组合梁桥抗弯性能[J].工程科学与技术,2022,54(6):146-156.
CHEN Kangming,LUO Jianping,WU Qingxiong,CHEN Baochun,CAI Fenfang.Bending Performance of Prestressed Concrete Composite Girder Bridge with Steel Truss Webs[J].Advanced Engineering Sciences,2022,54(6):146-156.