Print Email Facebook Twitter Reliability Analysis And Safety Assessments of Structural Wall with Nonlinear Finite Element Analyses Title Reliability Analysis And Safety Assessments of Structural Wall with Nonlinear Finite Element Analyses Author Bhattarai, Suman (TU Delft Civil Engineering and Geosciences; TU Delft Engineering Structures) Contributor Hendriks, M.A.N. (mentor) Yang, Y. (graduation committee) Degree granting institution Delft University of Technology Project Reliability Analysis And Safety Assessments of Structural Wall with Nonlinear Finite Element Analyses Date 2017 Abstract Inclusion of safety formats method in nonlinear finite element analysis of a structure is beneficial to realizethe safe and real behavior of structures. In addition, reliability analysis in combination with NLFEA resultsand safety assessments provide an insight into consistency of the safety assessments recommendations relatedto targeted safety. However, various complications arise regarding the appropriate constitutive modelto be used in analysis, estimation and inclusion of modelling uncertainty in results from nonlinear finite elementanalysis, unavailability of a suitable function that defines the response of a structure when subjected toa certain load etc.In this additional thesis, a case study is performed to study the combination of structural safety assessmentand reliability analysis using nonlinear finite element analysis. A wall specimen experimented by Lefaset. al is selected for the study [1]. Solution strategy is adopted based on the recommendations ofDutch guidelineswith some deviations [2]. The nonlinear finite element analyses are performed inDIANA 10.1. Since onlyone solution strategy was used during the analysis of a single wall specimen, the modelling uncertainty parameterswere estimated using results from previous studies[3]. The modelling uncertainty parameters wereestimated to be, µm Æ 1.21 and Vµ Æ 6.88%. These parameters infer that the results obained from differentsolution strategies were close to each other but still had a considerable bias with respect to the structuralcapacity obtained from the experimental values. The NLFEA underestimated the capacity as compared toexperimental results. Only 79.3 % of the experimental capacity was realized from NLFEA.Three different safety format methods suggested in [2] and a new safety format method by Schlune et al.[4] are used in NLFEA to estimate the design load capacity. The effect of inclusion of estimated model uncertaintyparameters on design load capacity is observed too. The results of safety assessments indicated thatthe design load estimated by using ECOV and Schlune et al. safety format are comparatively higher than usingPartial Safety Factor and Global Resistance Factor, but still conservative with respect to the experimentalresults.The reliability of the design load estimated by using different safety assessment methods is checked usingresponse surface method and first order reliability methods. A response surface method together with FORMis used to obtain a quadratic limit state function that closely represents the response of the structural wallsubjected to the design load value. The limit state function thus obtained is then used for FORM analysis,Importance sampling and/or Monte Carlo simulations to observe if the intended safety level is achieved.The study of acheived reliability index indicated that the design load values estimated by using three safetyformats recommended in [2] are conservative, whereas the one estimated by using Schlune et al. format wasfound to be non-conservative.The additional thesis was carried out with various approximations and limitations. All limitations and approximationsare explained in detail and justified where necessary and possible. The results and discussionsof this additional thesis are dependent only on a single solution strategy adopted in a single wall specimenand in a single failure mode. Therefore, the results should instead be interpreted as an indication of need offurther and extensive research and studies required in the field of reliability analysis and safety assessmentusing nonlinear finite element analysis. Subject reliability analysissafety assessmentsnonlinear finite element analysismodelling uncertainty To reference this document use: http://resolver.tudelft.nl/uuid:ff383419-6800-4f06-9812-6da9499a3bc0 Part of collection Student theses Document type student report Rights © 2017 Suman Bhattarai Files PDF CIE_5050_09_Additional_Th ... ttarai.pdf 1.97 MB Close viewer /islandora/object/uuid:ff383419-6800-4f06-9812-6da9499a3bc0/datastream/OBJ/view