沉入式大圆筒码头稳定性有限元强度折减法分析

Stability analysis of embedded large cylinder quay by strength reduction FEM

由于作用荷载复杂,沉入式大圆筒码头结构设计计算需要考虑不利情况下的各种荷载组合,难以应用现有的有限元加载系数法进行稳定性分析。有限元强度折减法目前已广泛应用于土体边坡稳定性分析。沉入式大圆筒结构的抗滑、抗倾稳定性是靠地基土的嵌固作用来维持的,可通过弱化土体强度来实现对结构极限破坏状态的模拟。在此假设基础上,建立沉入式大圆筒码头稳定性分析的有限元强度折减法。结合某工程实例,利用有限元强度折减法分析沉入式大圆筒码头结构的稳定性。强度折减法只需对土体的强度进行弱化,操作方便,克服了加载系数法的缺点,适用于码头等作用荷载复杂的结构物稳定性分析。

As for the embedded large cylinder quay, which is under action of complex external loads, all kinds of unfavorable load combination must be taken into account. It is difficult to make its stability analysis by using the loading coefficient finite element method. Strength reduction finite element method has been widely used in slope stability analysis. The embedded large cylinder structure maintains its stability against sliding and overturning by the embedded effect of foundation soil, and it is feasible to simulate the structural limit failure state by weakening the strength of the soil. On the basis of this assumption, the strength reduction FEM for stability analysis of the embedded large cylinder quay is set up. Based on an engineering practice, the strength reduction FEM is used for the stability analysis of the embedded large cylinder quay structure. Strength reduction method is only needed to weaken the soil strength, thus, it is easy to work out and effectively overcomes the disadvantages of the loading coefficient method. The strength reduction method is suitable for the stability analysis of structures with complex external loads like the quay.