Development of evaluation of the risk concerning the rock-shed based on the bearing capacity at the failure

岩棚通常由钢筋混凝土、预应力混凝土或钢构件建造。其中大多数使用混凝土材料。混凝土构件在罗克瀑布等动荷载作用下直至完全破坏的力学行为一直不清楚，本文采用离散单元法模拟型钢混凝土构件在冲击荷载作用下的复杂力学行为。文中给出了几种载荷条件下的算例。讨论了岩石边坡的荷载特性、破坏模式和能量耗散，提出了岩石边坡模型的简化方法、罗克瀑布荷载的处理方法以及在极限状态假设下岩石边坡的破坏概率。提出了大雪地区岩棚荷载系数的设计方法。

Rock-sheds are normally constructed by reinforced concrete, prestressed concrete or steel members. For most of them concrete materials are used. The behavior of concrete member up to complete failure has not been clear under dynamic load like rock falls.In this study, the distinct element method are developed to simulate the complex behavior of steel reinforced concrete member under the impact load. Several examples are shown under some kinds of loading conditions. The characteristics of loads, failure modes and energy dispersions are discussed.In the other hand, the simplification of rock shed for modeling, the method of the treatment of load by rock falls, the probability of failure of rock shed under the some assumptions concerning limit states. Consequently, the load factor design method are shown for the rock shed in heavy snow area.