椭圆形钢-混凝土组合桥塔受力性能试验研究
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摘要
为研究钢-混凝土组合桥塔的承载力和应变分布,以某独塔斜拉桥为背景,针对其椭圆形钢-混凝土组合桥塔,设计制作缩尺比1:8的桥塔局部模型进行偏心受压试验,研究设计荷载下钢塔壁和塔内混凝土的应变变化规律及桥塔的承载力,参考相关规范和文献计算组合桥塔的承载力并与试验结果进行对比。结果表明:组合桥塔模型的承载力为其等效设计荷载的2.65倍,具有较大的安全储备;塔梁交接处长轴向壁板产生应力集中现象,从而产生较大的纵向应变;壁板环向应变在焊缝处存在应力集中现象,该处壁板的环向拉应变最大;壁板对混凝土具有较强的套箍作用,使混凝土的应力～应变曲线具有强化阶段;采用规范中的钢管混凝土承载力公式能较准确计算组合桥塔的承载力。
To study the bearing capacity and strain distribution of a steel-concrete composite bridge pylon,a cable-stayed bridge with single pylon was taken as an example.Based on the steelconcrete composite bridge pylon with elliptical section of the bridge,a 1:8 scaled model of the pylon was designed and fabricated,to perform eccentric compression tests.Thereby,the variation patterns of the strain of the inner concrete and steel panel under the design load were investigated,and the bearing capacity of the pylon was also investigated.Moreover,the bearing capacity of the composite pylon was calculated according to the related codes and literature,and the calculated results were compared with test results.The results show that the bearing capacity of the model is 2.65 times the equivalent design load and has a large safety reserve.A larger longitudinal strain of the steel panel occurs at the longer axis of the ellipse at the interface of the pylon and the girder due to stress concentration.The maximum circumferential tensile strain of the steel panel occurs around the weld due to stress concentration.The steel plate has a strong confinement effect on the concrete inside,thus the stress-strain curve of the concrete possesses a strengthening stage.The bearing capacity of the composite pylon can be accurately calculated by the formulas used to calculate the bearing capacity of the concrete-filled steel tube specified in the relevant bridge codes.
To study the bearing capacity and strain distribution of a steel-concrete composite bridge pylon,a cable-stayed bridge with single pylon was taken as an example.Based on the steelconcrete composite bridge pylon with elliptical section of the bridge,a 1:8 scaled model of the pylon was designed and fabricated,to perform eccentric compression tests.Thereby,the variation patterns of the strain of the inner concrete and steel panel under the design load were investigated,and the bearing capacity of the pylon was also investigated.Moreover,the bearing capacity of the composite pylon was calculated according to the related codes and literature,and the calculated results were compared with test results.The results show that the bearing capacity of the model is 2.65 times the equivalent design load and has a large safety reserve.A larger longitudinal strain of the steel panel occurs at the longer axis of the ellipse at the interface of the pylon and the girder due to stress concentration.The maximum circumferential tensile strain of the steel panel occurs around the weld due to stress concentration.The steel plate has a strong confinement effect on the concrete inside,thus the stress-strain curve of the concrete possesses a strengthening stage.The bearing capacity of the composite pylon can be accurately calculated by the formulas used to calculate the bearing capacity of the concrete-filled steel tube specified in the relevant bridge codes.
引文
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[2]李献光,刘迎倩,徐海鹰.某轻骨料混凝土试件的栓钉推出试验研究[J].世界桥梁,2014,42(2):62-65.(LI Xian-guang,LIU Ying-qian,XU Hai-ying.Study of Push-Out Test for Shear Bolt Studs in Lightweight Aggregate Concrete Samples[J].World Bridges,2014,42(2):62-65.in Chinese)
[3]卫星,强士中.斜拉桥桥塔钢-混凝土结合段传力机理试验研究[J].工程力学,2013,30(1):255-260,313.(WEI Xing,QIANG Shi-zhong.Specimen Test for Mechanics Behavior of Steel-Concrete Composite Joint in Pylon of Cable-Stayed Bridge[J].Engineering Mechanics,2013,30(1):255-260,313.in Chinese)
[4]吴斌,王亚飞.自锚式悬索桥桥塔钢-混结合段局部受力分析[J].桥梁建设,2013,43(3):54-59.(WU Bin,WANG Ya-fei.Local Stress Analysis of Steel and Concrete Joint Section of Tower of Self-Anchored Suspension Bridge[J].Bridge Construction,2013,43(3):54-59.in Chinese)
[5]刘迎倩.自锚式悬索桥桥塔钢-混结合段受力的试验研究[J].铁道建筑,2018,58(2):13-17.(LIU Ying-qian.Experimental Study on Bridge Tower Steel-Concrete Combined Segment of Self-Anchored Suspension Bridge[J].Railway Engineering,2018,58(2):13-17.in Chinese)
[6]王冲,周莉,孙东利,等.独塔斜拉桥钢桥塔锚固区钢锚箱应力分析[J].桥梁建设,2015,45(3):51-57.(WANG Chong,ZHOU Li,SUN Dong-li,et al.Stress Analysis of Steel Anchor Box in Anchorage Zone of Steel Pylon of a Single-Pylon Cable-Stayed Bridge[J].Bridge Construction,2015,45(3):51-57.in Chinese)
[7]李翠霞.武汉鹦鹉洲长江大桥桥塔设计[J].桥梁建设,2014,44(5):94-98.(LI Cui-xia.Design of Towers of Yingwuzhou Changjiang River Bridge in Wuhan[J].Bridge Construction,2014,44(5):94-98.in Chinese)
[8]潘军,徐瑜.港珠澳大桥九洲航道桥主梁及桥塔施工关键技术[J].桥梁建设,2016,46(6):1-6.(PAN Jun,XU Yu.Key Techniques for Construction of Main Girder and Pylons of Jiuzhou Ship Channel Bridge of Hong Kong-Zhuhai-Macao Bridge[J].Bridge Construction,2016,46(6):1-6.in Chinese)
[9]许颖强.太原摄乐大桥异型钢-混混合塔柱施工技术[J].桥梁建设,2018,48(2):99-104.(XU Ying-qiang.Construction Techniques for SpecialShape Steel and Concrete Hybrid Pylon Columns of Shele Bridge in Taiyuan[J].Bridge Construction,2018,48(2):99-104.in Chinese)
[10]刘永健,姜磊,张宁.钢管混凝土中钢管的纵向容许应力[J].建筑科学与工程学报,2015,32(6):1-7.(LIU Yong-jian,JIANG Lei,ZHANG Ning.Longitudinal Allowable Stress of Steel Tube in ConcreteFilled Steel Tube[J].Journal of Architecture and Civil Engineering,2015,32(6):1-7.in Chinese)