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使用性能的极限状态,诸如裂纹、疲劳、挠度及振动等,通常控制桥梁的设计。因此,提出合适的设计标准是很重要的。 由于本文主要关心的是桥梁因受荷载(载重车辆)的重复作用而引起的累积损伤,所以拟用的近似法仅取决于荷载的大小及其出现的频率,而不是使桥梁处于强度极限状态时的荷载值。在预应力混凝土梁桥中,每片梁的活载谱依梁的位置而不同。根据活载出现的频率,提出每片梁活载的累积分布函数和推导出裂纹、疲劳和振动/挠度上限值的设计标准。
Limitations of performance properties, such as cracking, fatigue, deflection and vibration, usually control the design of the bridge. Therefore, it is important to propose appropriate design standards. Since the main concern of this paper is the cumulative damage caused to the bridge due to the repeated action of the load (truck), the approximate method to be used depends only on the size of the load and on the frequency of its occurrence, rather than on the strength of the bridge The load value. In prestressed concrete girder bridges, the live carrier spectrum of each beam varies depending on the position of the beam. According to the frequency of occurrence of live load, the cumulative distribution function of live load per sheet beam and the design criteria for deriving the upper limit of crack, fatigue and vibration / deflection are proposed.