具有异型钢—混结构主塔的斜拉桥力学特性研究
发布时间：2019-05-29 08:00
【摘要】：安徽省涡河三桥具有先进的设计理念,体现了可持续发展的思想。本工程为国内第一座水滴型钢结构主塔斜拉桥,目前国内类似形式的主塔相对较少,因此有必要对其力学性能进行深入的研究。以安徽省涡河三桥为基础,运用大型有限元软件建立整桥的实体模型和等效梁索模型,对整桥力学特性进行了深入的研究,主要研究内容和结论如下:运用建立的整桥实体模型,对钢结构主塔的位移和应力进行了研究。结果表明主塔的刚度和强度满足设计要求并有一定的安全储备。运用建立的整桥等效梁索模型,通过变化恒载、高跨比和塔根无索区长度,对主塔的位移和内力进行了研究。结果表明恒载和高跨比增加时,主塔最大总位移和内力均增加;塔根无索区长度增加时对主塔受力有利;考虑到主梁受力和工程造价,高跨比和塔根无索区长度与跨度的比值应控制在合适的范围内。运用建立的整桥等效梁索模型,并对整桥施加三向地震波激励,对其动力特性进行了研究。结果表明在外界激励下主梁更容易发生横桥向弯曲;主塔的纵桥向抗弯刚度大于横桥向抗弯刚度;在地震波的激励下主塔满足工程抗震要求。运用建立的整桥等效梁索模型,对结构增加辅助墩,研究了整桥的动力特性。结果表明增设辅助墩后结构刚度增加;单跨增加辅助墩时,辅助墩个数对结构振型及自振频率有一定影响,但影响较小;双跨均增加辅助墩时,辅助墩个数对结构振型及自振频率均有较大影响;实际工程中建议采用双跨均增设一对辅助墩的结构形式来加强结构的抗震性能。对主塔钢—混结合段的施工和自密实混凝土在钢—混结合段的应用进行了研究。结果表明使用自密实混凝土和合适的施工技术能够解决诸如混凝土硬化时易收缩开裂等施工难题,取得了良好的工程效果。本论文采用的研究方法和结论可以为类似的工程实践提供一定的借鉴和指导。
[Abstract]:The third Vorhe Bridge in Anhui Province has advanced design concept and embodies the idea of sustainable development. This project is the first water drop steel structure main tower cable-stayed bridge in China. At present, there are relatively few similar forms of main tower in China, so it is necessary to carry out in-depth study on its mechanical properties. Based on the third Vorhe Bridge in Anhui Province, the solid model and equivalent beam and cable model of the whole bridge are established by using large finite element software, and the mechanical properties of the whole bridge are deeply studied. The main research contents and conclusions are as follows: the displacement and stress of the main tower of steel structure are studied by using the solid model of the whole bridge. The results show that the stiffness and strength of the main tower meet the design requirements and have a certain safety reserve. By using the equivalent beam-cable model of the whole bridge, the displacement and internal force of the main tower are studied by changing the dead load, the ratio of height to span and the length of the cable-free zone of the tower root. The results show that the maximum total displacement and internal force of the main tower increase with the increase of dead load and height-span ratio, and the increase of the length of the cable-free zone of the tower root is beneficial to the stress of the main tower. Considering the stress and engineering cost of the main beam, the ratio of height to span and the ratio of length to span of cable-free zone of tower root should be controlled within the appropriate range. The dynamic characteristics of the whole bridge are studied by using the equivalent beam-cable model of the whole bridge and applying three-way seismic wave excitation to the whole bridge. The results show that the main beam is more prone to transverse bridge bending under external excitation, the longitudinal bridge bending stiffness of the main tower is larger than the transverse bridge bending stiffness, and the main tower meets the seismic requirements of the project under the excitation of seismic wave. By using the equivalent beam and cable model of the whole bridge, the dynamic characteristics of the whole bridge are studied by adding auxiliary piers to the structure. The results show that the stiffness of the structure increases with the addition of auxiliary piers, and the number of auxiliary piers has a certain influence on the vibration mode and natural frequency of the structure, but the influence is small when the auxiliary piers are added to a single span. When the number of auxiliary piers is increased, the number of auxiliary piers has a great influence on the vibration mode and natural frequency of the structure. In practical engineering, it is suggested that a pair of auxiliary piers should be added to strengthen the seismic performance of the structure. The construction of steel-concrete joint section of main tower and the application of self-compacting concrete in steel-concrete joint section are studied. The results show that the construction problems such as shrinkage cracking of concrete can be solved by using self-compacting concrete and suitable construction technology, and good engineering results have been obtained. The research methods and conclusions used in this paper can provide some reference and guidance for similar engineering practice.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27
本文编号：2487772
[Abstract]:The third Vorhe Bridge in Anhui Province has advanced design concept and embodies the idea of sustainable development. This project is the first water drop steel structure main tower cable-stayed bridge in China. At present, there are relatively few similar forms of main tower in China, so it is necessary to carry out in-depth study on its mechanical properties. Based on the third Vorhe Bridge in Anhui Province, the solid model and equivalent beam and cable model of the whole bridge are established by using large finite element software, and the mechanical properties of the whole bridge are deeply studied. The main research contents and conclusions are as follows: the displacement and stress of the main tower of steel structure are studied by using the solid model of the whole bridge. The results show that the stiffness and strength of the main tower meet the design requirements and have a certain safety reserve. By using the equivalent beam-cable model of the whole bridge, the displacement and internal force of the main tower are studied by changing the dead load, the ratio of height to span and the length of the cable-free zone of the tower root. The results show that the maximum total displacement and internal force of the main tower increase with the increase of dead load and height-span ratio, and the increase of the length of the cable-free zone of the tower root is beneficial to the stress of the main tower. Considering the stress and engineering cost of the main beam, the ratio of height to span and the ratio of length to span of cable-free zone of tower root should be controlled within the appropriate range. The dynamic characteristics of the whole bridge are studied by using the equivalent beam-cable model of the whole bridge and applying three-way seismic wave excitation to the whole bridge. The results show that the main beam is more prone to transverse bridge bending under external excitation, the longitudinal bridge bending stiffness of the main tower is larger than the transverse bridge bending stiffness, and the main tower meets the seismic requirements of the project under the excitation of seismic wave. By using the equivalent beam and cable model of the whole bridge, the dynamic characteristics of the whole bridge are studied by adding auxiliary piers to the structure. The results show that the stiffness of the structure increases with the addition of auxiliary piers, and the number of auxiliary piers has a certain influence on the vibration mode and natural frequency of the structure, but the influence is small when the auxiliary piers are added to a single span. When the number of auxiliary piers is increased, the number of auxiliary piers has a great influence on the vibration mode and natural frequency of the structure. In practical engineering, it is suggested that a pair of auxiliary piers should be added to strengthen the seismic performance of the structure. The construction of steel-concrete joint section of main tower and the application of self-compacting concrete in steel-concrete joint section are studied. The results show that the construction problems such as shrinkage cracking of concrete can be solved by using self-compacting concrete and suitable construction technology, and good engineering results have been obtained. The research methods and conclusions used in this paper can provide some reference and guidance for similar engineering practice.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27
【参考文献】
相关期刊论文 前4条
1 刘扬;唐礼翔;邓扬;;大跨斜拉桥施工阶段主塔地震响应分析[J];交通科学与工程;2014年01期
2 徐艳;段昕智;李建中;;强震作用下斜拉桥纵桥向非线性地震反应分析[J];华南理工大学学报(自然科学版);2012年06期
3 张年杰;;太原市火炬桥钢塔施工技术[J];建筑施工;2010年04期
4 谷音;钟华;卓卫东;;基于性能的矮塔斜拉桥结构地震易损性分析[J];土木工程学报;2012年S1期
，本文编号：2487772
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2487772.html
