斜拉桥预应力混凝土索塔锚固结构受力性能分析
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摘要
为了研究U形与直线预应力束混合布置索塔锚固结构的受力特性,以国内某姊妹塔斜拉桥的菱形桥塔为例,采用通用有限元程序建立索塔锚固结构的节段有限元模型,分析索塔锚固结构在预应力荷载与斜拉索水平力共同作用下的受力情况。结果表明:在索塔锚固结构中采用U形与直线预应力束混合布置能较好的满足设计要求,使锚固区整体处于较为合理的压力状态之下,除局部的应力集中外,基本消除了斜拉索作用下顺桥向塔柱的拉应力;在齿块与塔柱内壁的结合处存在应力集中现象,应当引起足够的重视,施工时应严格控制施工质量。
In order to analyze the mechanical characteristics of the cable-tower anchor zone with U prestressing tendon and linear prestressing tendon mixed layout,the diamond tower of a sister cable-stayed bridge has been studied. By using the general finite element program,the segmental finite element model of the cable-to-tower anchorage zone is developed and its stress conditions are analyzed combined prestressed load and horizontal force of cable.The results shows that the cable-to-tower anchorage zone with U prestressing tendon and linear prestressing tendon mixed layout can meet the design requirement preferably. The anchorage zone is in a relatively reasonable pressure state except local stress concentration and the longitudinal tensile stress of the tower basically eliminated except local stress concentration in the force of cable. While it should be paid enough attention for the stress concentrate phenomenon in the junction of block tooth and the tower's inner wall,and construction quality should be strictly controlled during construction.
In order to analyze the mechanical characteristics of the cable-tower anchor zone with U prestressing tendon and linear prestressing tendon mixed layout,the diamond tower of a sister cable-stayed bridge has been studied. By using the general finite element program,the segmental finite element model of the cable-to-tower anchorage zone is developed and its stress conditions are analyzed combined prestressed load and horizontal force of cable.The results shows that the cable-to-tower anchorage zone with U prestressing tendon and linear prestressing tendon mixed layout can meet the design requirement preferably. The anchorage zone is in a relatively reasonable pressure state except local stress concentration and the longitudinal tensile stress of the tower basically eliminated except local stress concentration in the force of cable. While it should be paid enough attention for the stress concentrate phenomenon in the junction of block tooth and the tower's inner wall,and construction quality should be strictly controlled during construction.
引文
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[12]叶华文,李翠娟,徐勋,等.独斜塔斜拉桥预应力索塔锚固区模型试验研究[J].西南交通大学学报,2014,49(1):52-58.
[13]王宏祥.斜拉桥桥塔拉索锚固区预应力效应分析[J].水利与建筑工程学报,2014,12(3):45-48.
[14]崔楠楠,贾布裕,余晓琳.斜拉桥单向预应力体系索塔锚固区足尺模型试验研究[J].湖南大学学报(自然科学版),2016,43(5):61-69.
[15]沈璐,邱文亮.大跨度斜拉桥索塔锚固区环向钢束预应力损失分析与试验研究[J].水利与建筑工程学报,2016,14(2):96-99.
[2]李立峰,邵旭东,增田胜.斜拉桥小尺寸预应力索塔的布束设计及试验研究[J].公路,2000(10):1-3.
[3]韩富庆,杨成斌,娄建,等.安庆长江公路大桥索塔锚固区受力分析[J].合肥工业大学学报(自然科学版),2002,25(6):1167-1170.
[4]刘钊,孟少平,刘智,等.润扬大桥北汊斜拉桥索塔节段足尺模型试验研究[J].土木工程学报,2004,37(6):35-40.
[5]单炜,李玉顺,于玲,等.异形截面斜拉桥索塔锚固区节段足尺模型试验研究[J].中国公路学报,2005,18(3):60-65.
[6]项贻强,易绍平,杜晓庆,等.南京长江二桥南汊桥斜拉索塔节段足尺模型的研究[J].土木工程学报,2000,33(1):15-22.
[7]刘兆丰,孟鑫,赵人达,等.长寿长江公路大桥索塔节段足尺模型试验研究[J].公路交通科技,2009,26(8):77-83.
[8]姚建军,刘孝辉,李琦,等.忠县长江大桥索塔锚固区模型试验与裂纹预测[J].桥梁建设,2009(2):32-35.
[9]张亮亮,王浩,杨转运,等.大跨度斜拉桥索塔锚固区应力分析[J].土木建筑与环境工程,2012,34(3):52-57.
[10]田仲初,陈耀章.三塔斜拉桥索塔锚固区节段足尺模型试验[J].公路交通科技,2013,30(7):89-96.
[11]叶华文,肖林,李翠娟,等.大跨斜拉桥预应力索塔锚固区受力机理及试验[J].哈尔滨工业大学学报,2013,45(12):78-85.
[12]叶华文,李翠娟,徐勋,等.独斜塔斜拉桥预应力索塔锚固区模型试验研究[J].西南交通大学学报,2014,49(1):52-58.
[13]王宏祥.斜拉桥桥塔拉索锚固区预应力效应分析[J].水利与建筑工程学报,2014,12(3):45-48.
[14]崔楠楠,贾布裕,余晓琳.斜拉桥单向预应力体系索塔锚固区足尺模型试验研究[J].湖南大学学报(自然科学版),2016,43(5):61-69.
[15]沈璐,邱文亮.大跨度斜拉桥索塔锚固区环向钢束预应力损失分析与试验研究[J].水利与建筑工程学报,2016,14(2):96-99.