【摘要】：安徽省渦河三橋具有先進的設計理念,體現(xiàn)了可持續(xù)發(fā)展的思想。本工程為國內第一座水滴型鋼結構主塔斜拉橋,目前國內類似形式的主塔相對較少,因此有必要對其力學性能進行深入的研究。以安徽省渦河三橋為基礎,運用大型有限元軟件建立整橋的實體模型和等效梁索模型,對整橋力學特性進行了深入的研究,主要研究內容和結論如下:運用建立的整橋實體模型,對鋼結構主塔的位移和應力進行了研究。結果表明主塔的剛度和強度滿足設計要求并有一定的安全儲備。運用建立的整橋等效梁索模型,通過變化恒載、高跨比和塔根無索區(qū)長度,對主塔的位移和內力進行了研究。結果表明恒載和高跨比增加時,主塔最大總位移和內力均增加;塔根無索區(qū)長度增加時對主塔受力有利;考慮到主梁受力和工程造價,高跨比和塔根無索區(qū)長度與跨度的比值應控制在合適的范圍內。運用建立的整橋等效梁索模型,并對整橋施加三向地震波激勵,對其動力特性進行了研究。結果表明在外界激勵下主梁更容易發(fā)生橫橋向彎曲;主塔的縱橋向抗彎剛度大于橫橋向抗彎剛度;在地震波的激勵下主塔滿足工程抗震要求。運用建立的整橋等效梁索模型,對結構增加輔助墩,研究了整橋的動力特性。結果表明增設輔助墩后結構剛度增加;單跨增加輔助墩時,輔助墩個數(shù)對結構振型及自振頻率有一定影響,但影響較小;雙跨均增加輔助墩時,輔助墩個數(shù)對結構振型及自振頻率均有較大影響;實際工程中建議采用雙跨均增設一對輔助墩的結構形式來加強結構的抗震性能。對主塔鋼—混結合段的施工和自密實混凝土在鋼—混結合段的應用進行了研究。結果表明使用自密實混凝土和合適的施工技術能夠解決諸如混凝土硬化時易收縮開裂等施工難題,取得了良好的工程效果。本論文采用的研究方法和結論可以為類似的工程實踐提供一定的借鑒和指導。
[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.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U448.27

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