《岩土与环境工程》刊登“土工织物加筋土墙的荷载和阻力系数的内部稳定性评估”

作者：Dongwook Kim, A.M.ASCE，Rodrigo Salgado, F.ASCE

刊物：岩土与环境工程 ，138卷第3期，910-921页

关键词：土工织物加筋土墙；钢条加固；极限状态；目标可靠性指标；一阶可靠性方法

摘要：本文主要介绍了钢条加筋土墙的荷载设计与阻力系数的内部稳定性评估的研究进展。土工织物加筋土墙的内部稳定性取决于两种承载能力极限状态：即断裂和钢筋结构失效。这个研究得到了计算阻力和荷载的方程式，也反映了土墙断裂和结构失效的物理过程，并且还对这些方程中的不确定性进行了量化。这些方程也可用于进行稳定性分析。首先利用不同的目标可靠度一阶稳定性方法得到荷载和阻力系数，然后一起应用于方程中。在ULS方程中，对于一个给定的目标可靠度和土工织物加筋土墙上的间接荷载，结构的失效对于设计变量的改变是不敏感的，但断裂的阻力系数高度依赖于钢筋的高度。

Load and Resistance Factors for Internal Stability Checks of Mechanically Stabilized Earth Walls

Author: Dongwook Kim, A.M.ASCE and Rodrigo Salgado, F.ASCE

Journal: Journal of Geotechnical and Geoenvironmental Engineering，Volumes 138，910-921

Key words: Mechanically stabilized earth walls, Steel strip reinforcement, Ultimate limit states, Target reliability index, First-order reliability method

Abstract: This paper focuses on the development of load and resistance factor design (LRFD) for checks of the internal stability of mechanically stabilized earth (MSE) walls reinforced with steel strips. The internal stability of MSE walls relies on protection against two ultimate limit states (ULSs): pullout and structural failure of reinforcements. This study proposes equations for the resistances and loads that reflect the physical processes involved in the pullout and structural failure ULSs and quantify the uncertainties in these equations. These equations are then used to perform reliability analyses using the first-order reliability method (FORM) for different values of target reliability index to obtain load factors and resistance factors for use together with the equations in design. For a given target reliability index and vehicular load on top of an MSE wall, the resistance factor for pullout was highly dependent on reinforcement depth while that for structural failure was insensitive to changes in the design variables in its ULS equation.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000595