缆索对连续刚构桥悬臂施工阶段地震响应的影响分析
发布时间：2018-11-07 07:50
【摘要】：连续刚构桥有着诸多的优点，，是国内大范围使用的一种桥梁结构形式。然而，现阶段抗震设计重点主要针对的是成桥使用阶段，施工阶段抗震性能研究成果较少，而连续刚构桥在施工阶段有着受力复杂、结构形式不稳定、施工工期长等特点，因此，施工阶段抗震研究显得十分必要。 特别在一些地震频发的地区，或者刚发生完大震不久的地区，其余震较频发(例如，日本福岛大地震后，在其后的六个月时期内，可观测到的震级超过里氏1级的余震就有8305次)，对于这些地区的在建桥梁，施工阶段抗震研究尤为重要。 本文研究的重点为在连续刚构桥悬臂施工阶段采用缆索减震的临时措施，研究缆索参数的改变对减震效果的影响，主要内容为： （1）缆索张拉桥墩情况下，本文分析了缆索张拉角度、位置对结构地震响应的影响，以得到减震效果最好的张拉参数；还对比分析了单根张拉和多根分散张拉时结构的地震响应，以确定哪种张拉方式减震效果最好。 （2）缆索张拉主梁情况下，本文分析了缆索张拉角度、位置对结构地震响应的影响，以得到减震效果最好的张拉参数；还对比分析了单根张拉和多根分散张拉时结构的地震响应，以确定哪种张拉方式减震效果最好。 （3）本文对比分析了只张拉桥墩、只张拉主梁及桥墩和主梁均张拉三种张拉形式随高跨比变化结构的地震响应，以得到不同高跨比，减震效果最好的张拉形式。 （4）应用上述研究成果，本文对四川某实桥进行抗震分析验算，证明上述研究结论的准确性。
[Abstract]:Continuous rigid frame bridge has many advantages. It is a kind of bridge structure which is widely used in our country. However, at the present stage of seismic design, the main focus of seismic design is the completion of the use of the bridge, the construction phase of seismic performance research results are less, while the continuous rigid frame bridge in the construction phase has the characteristics of complex force, unstable structure form, long construction period and so on. Therefore, the seismic research in construction stage is very necessary. Especially in some areas where earthquakes occur frequently, or where major earthquakes have just taken place, their aftershocks are more frequent (for example, in the following six months after the Fukushima earthquake in Japan, There are only 8305 aftershocks with magnitude 1 on the Richter scale. For the bridges under construction in these areas, it is very important to study the earthquake resistance in the construction stage. The emphasis of this paper is to adopt the temporary measures of cable vibration absorption in the cantilever construction of continuous rigid frame bridge. The main contents are as follows: (1) under the condition of cable tension pier, the effect of cable parameter change on vibration absorption effect is studied. In this paper, the influence of cable tension angle and position on the seismic response of the structure is analyzed, in order to obtain the best tensile parameters of the damping effect. The seismic responses of single tensioning and multiple dispersive tensioning structures are compared and analyzed in order to determine which tensioning method is the best. (2) in the case of cable tension main beam, the influence of cable tension angle and position on the seismic response of the structure is analyzed in order to obtain the best tensile parameters of the damping effect; The seismic responses of single tensioning and multiple dispersive tensioning structures are compared and analyzed in order to determine which tensioning method is the best. (3) in this paper, the seismic responses of the structures with only tensioned bridge piers, only tensioning main beams and bridge piers and main girders with the variation of height-span ratio are compared and analyzed, in order to obtain the best tension form with different height-span ratio and the best damping effect. (4) based on the above research results, the aseismic analysis and calculation of a real bridge in Sichuan Province are carried out to prove the accuracy of the above conclusions.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.466;U441.3
本文编号：2315691
[Abstract]:Continuous rigid frame bridge has many advantages. It is a kind of bridge structure which is widely used in our country. However, at the present stage of seismic design, the main focus of seismic design is the completion of the use of the bridge, the construction phase of seismic performance research results are less, while the continuous rigid frame bridge in the construction phase has the characteristics of complex force, unstable structure form, long construction period and so on. Therefore, the seismic research in construction stage is very necessary. Especially in some areas where earthquakes occur frequently, or where major earthquakes have just taken place, their aftershocks are more frequent (for example, in the following six months after the Fukushima earthquake in Japan, There are only 8305 aftershocks with magnitude 1 on the Richter scale. For the bridges under construction in these areas, it is very important to study the earthquake resistance in the construction stage. The emphasis of this paper is to adopt the temporary measures of cable vibration absorption in the cantilever construction of continuous rigid frame bridge. The main contents are as follows: (1) under the condition of cable tension pier, the effect of cable parameter change on vibration absorption effect is studied. In this paper, the influence of cable tension angle and position on the seismic response of the structure is analyzed, in order to obtain the best tensile parameters of the damping effect. The seismic responses of single tensioning and multiple dispersive tensioning structures are compared and analyzed in order to determine which tensioning method is the best. (2) in the case of cable tension main beam, the influence of cable tension angle and position on the seismic response of the structure is analyzed in order to obtain the best tensile parameters of the damping effect; The seismic responses of single tensioning and multiple dispersive tensioning structures are compared and analyzed in order to determine which tensioning method is the best. (3) in this paper, the seismic responses of the structures with only tensioned bridge piers, only tensioning main beams and bridge piers and main girders with the variation of height-span ratio are compared and analyzed, in order to obtain the best tension form with different height-span ratio and the best damping effect. (4) based on the above research results, the aseismic analysis and calculation of a real bridge in Sichuan Province are carried out to prove the accuracy of the above conclusions.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.466;U441.3
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