ReSSA+ includes significant modifications of ReSSA(3.0). FHWA-HIF-17-004 (Download) and Leshchinsky et al. (2017) (Download) provide all the details including instructive example problems.  ReSSA+ allows for a convenient two-stage analysis which may lead to optimal design of geosynthetic-reinforced complex structure. It does not distinguish between ‘slopes’ and ‘walls’ but rather uses a unified limit state approach which uses established limit equilibrium analysis. For a given problem including geosynthetic layout, one can determine in Stage I the reinforcement load needed to render a limit state nearly anywhere within the reinforced soil. This baseline solution culminates with a Tension Map enabling one to select geosynthetic and connection with adequate long-term strengths. By a click of a button, one can switch from Stage I to Stage II. In Stage II global stability is assessed considering rotational failure modes (including foundation and compound-type failures) and translational failure mode mainly representing possible sliding. The spatial distribution safety factors which were calculated for actual specified reinforcement and connection culminates with a Safety Map.  Both Safety Map and Tension Map are powerful visual diagnostic tools, rationally complementing each other.   In both, Stage I and Stage II, program ReSSA+ can consider facing units as well as an increase in pullout resistance at the back-end of reinforcement stemming from, for example, deadman or anchors (user needs to specify the back-end increase).




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