托巴大桥施工线形和应力控制研究

发布时间：2018-06-21 14:17

本文选题：设计荷载 + 线形　；参考：《昆明理工大学》2017年硕士论文

【摘要】：对一座桥梁施工质量的衡量,其主要标准就是看桥梁的实际受力状态及线形是否达到设计的要求。在大跨径拱桥中,拱桥内力的分布在很大程度上取决于拱圈线形,而对其进行线形控制就是为了使内力及成桥线形达到设计要求。对于大跨度钢筋混凝土拱桥,线形控制就是使拱箱的实际成拱线形在设计要求范围内,并使其达到目标成拱线形。本文以位于云南省迪庆州澜沧江上的托巴大桥为工程背景,对以上问题进行研究,该桥属于重载拱桥。由于工程实际的需要,汽车-60级,挂车-300验算(当使用汽-60,挂-300的荷载设计时,桥梁上至少可以通过300吨的汽车荷载)。(1)拱桥载重越大,其设计要求越高,对其线形和应力则更需是在设计要求之内。应用有限元软件对该桥施工预拱度进行合理设置,分析重载拱桥的预拱度设置。为今后重载拱桥的预拱度设置提供一定的参考依据。(2)重载拱桥的设计载重越是增大,其对线形的影响越是严重。因各种误差因素的影响,实测线形是很难做到与设计线形完全一致。结合有限元分析软件对施工各阶段的沉降进行分析,并分析拱上建筑队拱圈线形的影响。(3)论文结合托巴拱桥,对拱上建筑应力对线形的影响进行分析研究,同时总结各施工阶段应力和线形之间的影响和变化规律。分析重载拱桥施工中应力和线形之间关系,并通过此规律,在以后的重载钢筋混凝土拱桥施工中,可以通过位移变化情况,大概计算出全桥的应力分布情况,能在一定程度上解决应力监测困难的问题。对重载拱桥拱圈最不利受力和位移变化最大位置进行重点监控,对今后重载拱桥在拱圈线形和应力控制方面有一定的参考意义。(4)对托巴大桥进行荷载试验,检测其承载力是否达到设计荷载标准。通过试验研究分析重载拱桥的线形、内力受外力影响与普通桥梁的不同,对其稳定性进行分析判断,为以后同类桥梁的施工及监控提供参照研究打下一定基础。
[Abstract]:To measure the construction quality of a bridge, its main criterion is to see whether the actual force state and the line shape of the bridge meet the design requirements. In the long span arch bridge, the distribution of the internal force of the arch bridge to a great extent depends on the arch ring shape, and the linear control of the arch bridge is to make the internal force and the bridge alignment meet the design requirements. For long span reinforced concrete arch bridge, linear control is to make the actual arch shape of the arch box within the design requirements, and to achieve the goal of the arch line. In this paper, the Toba Bridge, located on the Lancang River in Diqing Prefecture, Yunnan Province, is taken as the engineering background, and the above problems are studied. The bridge belongs to the heavy-haul arch bridge. Because of the actual engineering needs, the larger the load of the arch bridge, the higher the design requirement of the arch bridge, the greater the load on the arch bridge is, the greater the load of the automobile class -60, the trailer -300 (when the load of the automobile is 60, hanging, 300) is used, the bridge can pass through at least 300 tons of vehicle load. For its shape and stress, it is more necessary to be within the design requirements. This paper applies finite element software to set the pre-arch degree of the bridge, and analyzes the pre-arch degree setting of the heavy-load arch bridge. The design load of the heavy-haul arch bridge increases, and the influence on the alignment becomes more serious, which provides a certain reference basis for setting the pre-arch degree of the heavy-haul arch bridge in the future. Due to the influence of various error factors, it is difficult for the measured alignment to be completely consistent with the design line. Combined with finite element analysis software, the settlement of each stage of construction is analyzed, and the influence of arch ring shape on arch construction team is analyzed in this paper. In combination with Toba arch bridge, the influence of building stress on line shape on arch is analyzed and studied in this paper. At the same time, the influence and variation law of stress and line shape in each construction stage are summarized. This paper analyzes the relationship between stress and line shape in the construction of heavy-duty arch bridge, and through this rule, the stress distribution of the whole bridge can be calculated by the change of displacement in the later construction of heavy-duty reinforced concrete arch bridge. It can solve the problem of stress monitoring to some extent. This paper focuses on monitoring the most unfavorable force and the maximum position of displacement change of arch ring of heavy-haul arch bridge, which has certain reference significance for the arch ring shape and stress control of heavy-haul arch bridge in the future. Check whether the bearing capacity is up to the design load standard. Through experimental study and analysis of the alignment of heavy-duty arch bridge, the internal force affected by external force is different from that of common bridge. The stability of the bridge is analyzed and judged, which will provide a reference for the construction and monitoring of similar bridges in the future.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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