This paper presents a new classification system called the Marine Structure Health index (MSHi). An evaluation model based on the fuzzy Delphi analytic hierarchy process (FDAHP) has been used for estimation of health in marine concrete structures. For this purpose, fifteen types of cracking in concrete, surface distresses, and miscellaneous distresses have initially been investigated and rated. In the MSHi system, a number from 0 to 100 is assigned to the health of a structure. Based on the MSHi classification, the health of a structure is classified into five modes from the view point of distress: very poor, poor, medium, good and very good.
Abstract. The pre-and post-peak performance features of two widely used damage-plasticity constitutive formulations are assessed for modeling the multiaxial response behavior of pressure sensitive quasi-brittle materials such as concrete. Two benchmark problems have been solved using commercial software packages; ABAQUS which implements the two invariant LeeFenves damaged plasticity formulation as its main feature for concrete has been used along with LS-DYNA which is using Duvaut-Lion damage and plasticity model, a three invariant formulation. In order to have consistent results, the parameter identification and calibration for both models has been performed and response of both models has been compared to each other under uniaxial tension and compression. The two benchmark problem are triaxial compression CTC and triaxial tension CTE. The aim of this study is to observe the difference between two well-known material models in capturing the compaction to extension regime in the yielded material. The difference between the response of each material model and also the efficiency of input parameters in controlling of this transition has been studied in this paper. Based on these failure diagnostics, the main shortcomings of each formulation are discussed and possible enhancements and remedies are proposed for the pre-and post-peak feature.
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