悬索桥波形钢腹板横梁桥塔抗震性能研究

发布时间：2019-01-10 14:30

【摘要】：由于悬索桥具有卓越的跨越能力,现在已经成为在高烈度山区高速公路大跨桥梁中极具竞争力的桥型。然而传统PC横梁悬索桥桥塔重量和刚度都比较大,在地震荷载作用下容易发生破坏,特别是横梁的抗剪验算不容易通过。波形钢腹板PC组合梁具有结构自重轻、刚度小、抗剪承载力高、地震荷载作用下的内力响应小等优点,较符合高烈度地区悬索桥桥塔横梁的受力需求,而现在波形钢腹板PC组合梁抗震性能的研究几乎没有涉及悬索桥桥塔横梁应用的研究内容。所以有必要研究这种结构在地震荷载作用下的受力特点。本论文进行了这方面的探讨和研究,具体研究内容和成果如下:以某单跨钢桁梁悬索桥为工程背景,在考虑加劲梁与桥塔连接处纵向阻尼器作用,以及桩土之间相互作用的基础上建立相应的悬索桥有限元模型。桥塔分别拟定2道横梁、3道横梁、4道横梁三种不同的横梁方案,每一种方案分为波形钢腹板PC组合梁及PC箱梁两种类型,一共6个不同的桥塔模型,运用时程分析法计算不同横梁类型以及不同横梁数量桥塔在地震荷载的内力响应。选择地震荷载作用下内力响应最优的3道横梁方案,运用截面抗震分析软件XTRACT分析桥塔不同横梁材料上、中、下横梁的屈服弯矩,结合同一模型不同荷载工况下桥塔的内力响应,对比波形钢腹板PC组合横梁桥塔与PC箱梁桥塔的极限承载力和破坏过程。运用有限元软件ANSYS建立不同顶底板厚度不同宽跨比的6个模型,计算得出顶底板剪力滞系数。通过对比分析剪力滞系数的大小和分布规律,了解几何构造对波形钢腹板PC组合横梁剪力滞系数的影响,再结合施工现场应变计测试数据校核有限元计算结果。计算分析结果表明:在相同地震荷载作用下,波形钢腹板PC组合横梁桥塔的最不利弯矩和剪力都明显小于PC横梁桥塔的结果;随着桥塔横梁数量的增加,下、中横梁的最不利弯矩和剪力呈现出逐步增加的趋势;上横梁的最不利弯矩和剪力呈现出逐步减小的趋势;波形钢腹板PC组合梁横梁桥塔相对于普通PC横梁桥塔可以提高桥塔初次发生破坏的荷载强度,有效提高桥塔的抗震极限承载力;波形钢腹板PC组合梁顶底板厚度越大,剪力滞效应曲线也就越趋于平均;外侧腹板区域的剪力滞系数随着梁宽度的增加而迅速提高,内侧腹板区域的剪力滞系数随着梁宽度的增加而减小;
[Abstract]:Because of its excellent span ability, suspension bridge has become a very competitive bridge type in high intensity mountain highway long span bridge. However, the weight and stiffness of the traditional PC suspension bridge tower are both large, and it is easy to damage under the earthquake load, especially the calculation of the shear resistance of the beam is not easy to pass. The PC composite beam with corrugated steel web plate has the advantages of light weight, small stiffness, high shear capacity and small internal force response under earthquake load, which is more suitable for the stress requirement of the tower beam of suspension bridge in high intensity area. However, the seismic behavior of PC composite beams with corrugated steel webs has hardly been studied in the application of suspension bridge tower beams. Therefore, it is necessary to study the stress characteristics of this structure under earthquake load. The research contents and results are as follows: taking a single span steel truss suspension bridge as the engineering background, the effect of longitudinal damper at the connection between stiffened beam and tower is considered. Based on the interaction between pile and soil, the finite element model of suspension bridge is established. Two beams, three beams, four beams, three different beam schemes are drawn up, each of which is divided into two types: PC composite beam with corrugated steel webs and PC box girder. There are six different tower models. Time history analysis method is used to calculate the internal force response of different beam types and the number of beams under earthquake load. In this paper, three beams with optimum internal force response under earthquake load are selected, and the yield moment of the upper, middle and lower beams of the bridge tower is analyzed by using the cross-section seismic analysis software XTRACT. Combined with the internal force response of the tower under different load conditions of the same model, the ultimate bearing capacity and failure process of the PC composite crossbeam tower with corrugated steel webs and the PC box girder bridge tower are compared. By using finite element software ANSYS, six models with different thickness and width / span ratio of roof and bottom plate are established, and the shear lag coefficient of top and bottom plate is calculated. By comparing and analyzing the magnitude and distribution of shear lag coefficient, the influence of geometric structure on shear lag coefficient of PC composite beam with corrugated steel web plate is understood, and the finite element calculation results are checked with the test data of strain gauge in construction site. The results show that under the same earthquake load, the most unfavorable bending moment and shear force of the PC composite beam tower with corrugated steel web are obviously smaller than those of the PC beam tower. With the increase of the number of bridge tower beams, the most unfavorable moment and shear force of the middle beam increase gradually, the most unfavorable moment and shear force of the upper beam gradually decrease. Corrugated steel web PC composite beam tower can increase the initial failure load strength of the tower compared with the common PC beam tower and effectively improve the ultimate seismic bearing capacity of the tower. The larger the thickness of the top and bottom plate of the PC composite beam with corrugated steel web, the more average the shear lag effect curve is. The shear lag coefficient of the lateral web region increases rapidly with the increase of the beam width, and the shear lag coefficient of the inner web region decreases with the increase of the beam width.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.25

【参考文献】

相关期刊论文 前10条

1 艾庆华;王东升;向敏;;基于纤维单元的钢筋混凝土桥墩地震损伤评价[J];计算力学学报;2011年05期

2 徐艳;George C Lee;;Traveling wave effect on the seismic response of a steel arch bridge subjected to near fault ground motions[J];Earthquake Engineering and Engineering Vibration;2007年03期

3 郭彦林;张庆林;;波折腹板工形构件截面承载力设计方法[J];建筑科学与工程学报;2006年04期

4 陈道政,刘先明,叶正强,叶继红,李爱群;大跨度空间网格结构多点输入反应谱计算方法的研究[J];应用力学学报;2005年03期

5 李忠献,黄健,丁阳,史志利;不同地震激励下大跨度斜拉桥的地震反应分析[J];中国公路学报;2005年03期

6 曹一山,朱f^;一种评价桥梁结构抗震性能的简化方法[J];北方交通大学学报;2004年04期

7 宋建永,张树仁,吕建鸣;波纹钢腹板剪切屈曲分析中初始缺陷的模拟和影响程度分析[J];公路交通科技;2004年05期

8 陈常松,颜东煌,陈政清,涂光亚,田仲初;混凝土振弦式应变计测试技术研究[J];中国公路学报;2004年01期

9 王福敏,周长晓,张长青;波形腹板箱梁钢腹板稳定试验研究[J];公路交通技术;2003年05期

10 孙建梅 ,叶继红 ,程文p<;多点输入反应谱方法的简化[J];东南大学学报(自然科学版);2003年05期

相关会议论文 前1条

1 王力;梁志远;张航;邸晖;董庆园;;某工程任意截面柱的实用设计方法讨论[A];钢结构工程研究（十）——中国钢结构协会结构稳定与疲劳分会第14届(ISSF-2014)学术交流会暨教学研讨会论文集[C];2014年

相关博士学位论文 前2条

1 李杰;自锚式悬索桥地震非线性时程响应分析和简化方法研究[D];西南交通大学;2007年

2 吴文清;波形钢腹板组合箱梁剪力滞效应问题研究[D];东南大学;2002年

相关硕士学位论文 前4条

1 张耀月;大跨度斜拉桥地震响应分析[D];北京交通大学;2014年

2 朱永;悬索桥索塔横系梁延性抗震性能计算分析[D];重庆交通大学;2013年

3 张梦龙;高烈度地区悬索桥主塔的横梁结构形式对抗震性能影响的研究[D];重庆交通大学;2012年

4 刘涛涛;桥墩延性抗震设计的安全性评价[D];西南交通大学;2011年

，

本文编号：2406420