CAJ | 학술논문

针对采用节段悬浇施工的大跨度混凝土梁桥普遍存在的持续下挠问题,提出基于荷载效应平衡的"合理成桥状态"概念以及相应的预应力配筋设计方法.通过合理的纵向预应力配置去适度平衡多种作用效应,使桥梁处于合理的成桥状态(弯曲状态、应力状态和挠曲状态),以便能够抑制跨中长期下挠.此外,还提出控制最大压应力水平和采用体内-体外混合配束的设计策略.结合持续下挠的机理讨论,认为合理成桥状态是一种能有效抑制桥梁下挠的实用设计方法.
침대채용절단현요시공적대과도혼응토량교보편존재적지속하뇨문제,제출기우하재효응평형적"합리성교상태"개념이급상응적예응력배근설계방법.통과합리적종향예응력배치거괄도평형다충작용효응,사교량처우합리적성교상태(만곡상태、응력상태화뇨곡상태),이편능구억제과중장기하뇨.차외,환제출공제최대압응력수평화채용체내-체외혼합배속적설계책략.결합지속하뇨적궤리토론,인위합리성교상태시일충능유효억제교량하뇨적실용설계방법.
In the light of the sustained defection deterioration commonly existing in the long span prestressed concrete (PC) girder bridges constructed by the segmental cantilever casting method,the concept of the"rational completion status"based on the load effect balancing principle and the corresponding design method for arrangement of prestressing are proposed.By way of the rational arrangement of the longitudinal prestressing,the different actions of various effect will be balanced to an appropriate degree and the bridges will be kept in the rational completion status(bending status,stress status and flexure status)so that the middle and long term deflection of the bridges can be inhibited.In addition,the design strategy of controlling the maximum compressive stress level and the mixed arrangement of the internal and external prestressing is also put forward.With reference to the discussions on the mechanism of the sustained deflection,the"rational completion status"concept as provided herewith is justified as a practical design method that can effectively inhibit the sustained defection of the bridges.