分丝管型索鞍锚固区局部应力简化模拟
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摘要
以某矮塔斜拉桥为工程背景,利用Hypermesh+Abaqus联合仿真的思路,模拟分析了该桥索塔分丝管型索鞍锚固区鞍下混凝土的应力情况。介绍了有限元联合仿真的思路、等效均匀面荷载和等效线性面荷载的推导,并给出了在不同荷载作用模式下索塔混凝土的主要分析结果。结果表明:分丝管外围混凝土会出现较大的主应力,但很快扩散至均匀;分丝管下缘混凝土最大主拉应力在不同荷载作用模式下差异较大,且在环向均匀面荷载下比在环向线性面荷载下明显要大。
Taking a low-pylon cable-stayed bridge as the engineering background,the stress of concrete in anchorage zone of cable tower with strand-separating saddle was simulated and analyzed by the Abaqus & Hypermesh simulation method.The idea of joint finite element simulation,the derivation of equivalent uniform surface load and equivalent linear surface load were introduced,and the main analysis results of pylon concrete under different load modes were given.The results show that:1)the concrete around the filament separator will have larger principal stress,but it will soon spread to uniformity;2)the maximum principal tensile stress of the concrete at the lower edge of the filament separator varies greatly under different load modes,and the stress under the circumferential uniform plane load is significantly larger than that under the circumferential linear plane load.
Taking a low-pylon cable-stayed bridge as the engineering background,the stress of concrete in anchorage zone of cable tower with strand-separating saddle was simulated and analyzed by the Abaqus & Hypermesh simulation method.The idea of joint finite element simulation,the derivation of equivalent uniform surface load and equivalent linear surface load were introduced,and the main analysis results of pylon concrete under different load modes were given.The results show that:1)the concrete around the filament separator will have larger principal stress,but it will soon spread to uniformity;2)the maximum principal tensile stress of the concrete at the lower edge of the filament separator varies greatly under different load modes,and the stress under the circumferential uniform plane load is significantly larger than that under the circumferential linear plane load.
引文
[1]张奇志,尹夏明,郑舟军.钢锚梁索塔锚固区受力机理分析与约束方式比选[J].桥梁建设,2012,42(6):50-56.ZHANG Qizhi,YIN Xiaming,ZHENG Zhoujun.Analysis of force mechanism and comparison of restraint ways for steel anchor beam anchorage zone in pylon[J].Bridge Construction,2012,42(6),50-56.
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[8]陈兴冲,赵霞,刘尊稳,等.铁路矮塔斜拉桥索塔锚固区局部应力分析[J].兰州交通大学学报,2012,31(3):1-4.CHEN Xingchong,ZHAO Ting,LIU Zunwen,et al.Stress analysis of cable-pylon anchorage zones of extra-dosed cable-stayed bridge in railway[J].Journal of Lanzhou Jiaotong University,2012,31(3):1-4.
[9]张海文,李亚东.矮塔斜拉桥索鞍混凝土局部应力分析[J].铁道标准设计.2009(1):42-44.ZHANG Haiwen,LI Yadong.Local stress analysis of cable-pylon anchorage zones for extra-dosed cable-stayed bridge[J].Railway Standard Design,2009(1):42-44.
[2]汪昕,吕志涛.斜向索力下钢-混凝土组合索塔锚固区荷载传递与分配关系分析[J].东南大学学报(自然科学版),2006,36(4):585-589.WANG Xin,LV Zhitao.Analysis of load transferring and distribution in anchorage zone of steel-concrete composite pylon under inclined cable forces[J].Journal of Southwest University(Natural Science Edition),2006,36(4):585-589.
[3]唐可,郑舟军,陈开利,等.荆岳长江公路大桥索塔锚固区实桥受力机理试验研究[J].桥梁建设,2014,44(6):52-56.TANG Ke,ZHANG Zhoujun,CHEN Kaili,et al.Test study of force mechanism of pylon anchorage zone of actual bridge of Jingyue Changjiang river highway bridge[J].Bridge Construction,2014,44(6):52-56.
[4]刘钊,孟少平,吕志涛.两座大型斜拉桥索塔锚固区模型试验及对比研究[J].中国工程科学,2003,5(12):48-54.LIU Zhao,MENG Shaoping,LV Zhitao.Model tests and comparative study of the pylon's anchorage zone of two long-span cable-stayed bridges[J].Engineering Science,2003,5(12):48-54.
[5]宋军,王福敏,耿波,等.基于接触理论的矮塔斜拉桥索塔锚固区应力分析[J].重庆交通大学学报(自然科学版),2011,30(3):353-356.SONG Jun,WANG Fumin,GENG Bo,et al.Stress analysis of anchorge zone of cable tower in extradosed cable-stayed bridge based on contact theory[J].Journal of Chongqing Jiaotong University(Natural Science),2011,30(3):353-356.
[6]李三珍.斜拉桥索塔锚固区局部应力分析[J].中国市政工程,2011(2):28-33.LI Sanzhen.On local stress analysis of cable tower anchorage zone of cable-stayed bridge[J].China Municipal Engineering,2011(2):28-33.
[7]丁志威,张俊峰,武修雄,等.斜拉桥索塔与索梁锚固区局部应力分析[J].交通科技,2011(5):4-6.DING Zhiwei,ZHANG Junfeng,WU Xiuxiong,et al.Local stress analysis of anchorage for cable-stayed bridges based on the finite element method[J].Transportation Science&Technology,2011(5):4-6.
[8]陈兴冲,赵霞,刘尊稳,等.铁路矮塔斜拉桥索塔锚固区局部应力分析[J].兰州交通大学学报,2012,31(3):1-4.CHEN Xingchong,ZHAO Ting,LIU Zunwen,et al.Stress analysis of cable-pylon anchorage zones of extra-dosed cable-stayed bridge in railway[J].Journal of Lanzhou Jiaotong University,2012,31(3):1-4.
[9]张海文,李亚东.矮塔斜拉桥索鞍混凝土局部应力分析[J].铁道标准设计.2009(1):42-44.ZHANG Haiwen,LI Yadong.Local stress analysis of cable-pylon anchorage zones for extra-dosed cable-stayed bridge[J].Railway Standard Design,2009(1):42-44.