Fatigue Check Method in the Performance Based Design for Slab Decks of the Steel Bridge

在基于性能的设计方法中，由于板受到直接移动荷载的作用，疲劳性能是最重要的。本文对混凝土板的疲劳性能进行了研究。楼板的加载是重复的和移动的。板件在冲剪作用下的静定位载荷强度不仅与定位载荷疲劳强度有关，而且与移动载荷疲劳强度有关。移动载荷作用下的疲劳强度可能与重复次数有关。为了研究移动载荷作用下的疲劳强度，对其静态强度和强度与重复次数的关系进行了评估。试验由载荷试验机和移动试验机进行。由于静力强度是自然分散的，因此对其统计性能也有一定的要求。在移动反复荷载作用下，进行了几块板和钢筋混凝土板的试验。这些板包括一块预应力混凝土板和一块钢混凝土组合板。根据这些试验，日本土木工程学会的委员会提出了一种基于性能的楼板设计方法。该委员会由滨田担任主席，他是该项目的执行者。日本钢结构研究所的一个委员会也提出了基于性能的设计方法。这些基于性能的设计方法包括与移动载荷下的疲劳强度相关的性能。

Since slabs are subjected direct moving loads, fatigue performance is the most significant in the performance based design method. In the present study fatigue performance of the concrete slab is surveyed. The loading of the slab is repeated and moving. Not only a located load fatigue strength but also the moving load fatigue strength are related to the static located load strength of the slab under punching shear. The fatigue strength under a moving load is presumably related to the repeated number. In order to study the fatigue strength under a moving load, the static strength and the relationship between strength and repeated number are evaluated. Tests were conducted by the loading test machine and moving test machine. Since the static strength is scattered naturally, the statistic properties are also required.Several slabs were tested under moving repeated load as well as reinforced concrete slabs. These slabs include a prestressed concrete slab and a steel concrete composite slab. From these tests a performance based design method for slabs is proposed by the committee in the Japan Society of Civil Engineering. The committee is chaired by Hamada, who is an executor of the project. The performance based design method is also proposed by a committee in the Japan Steel Structure Institute. These performance based design methods includes performances related to the fatigue strength under moving load.