Main Article Content
NUMERICAL MODELS ARE OFTEN USED IN TESTS SIMULATION TO REDUCE COSTS AND TIME, AS SUCH MODELS CAN ASSIST IN THE ELABORATION OF AN OPTIMIZED EXPERIMENTAL PROGRAM AND ALLOW THE EXTRAPOLATION OF RESULTS. HOWEVER, FEW STUDIES SIMULATE TESTS INVOLVING CYCLIC LOADING ACCOMPANIED BY DYNAMIC TESTING. IN THIS CONTEXT, THIS PAPER PROVIDES GUIDELINES FOR CYCLIC LOADING BENDING TEST SIMULATION AND MODAL ANALYSIS OF A REINFORCED I-BEAM. THE PURPOSE OF THIS WORK IS TO PRESENT A NUMERICAL MODEL CALIBRATION METHODOLOGY, AS WELL AS TO CORRELATE THE DAMAGE CAUSED BY MECHANICAL STRESS WITH THE DYNAMIC PARAMETERS OF THE STRUCTURE. FOR THIS PURPOSE, EXPERIMENTAL AND NUMERICAL STUDIES WERE PERFORMED. IN THE EXPERIMENTAL STUDY, THE CYCLIC BENDING TEST WAS PERFORMED AND THE NATURAL FREQUENCIES OF THE STRUCTURE IN THE INTACT AND DAMAGED STATES WERE MEASURED. IN THE SIMULATION OF THE CYCLIC BENDING TEST THE CONCRETE DAMAGED PLASTICITY (CDP) MODEL IMPLEMENTED IN ABAQUS FINITE ELEMENT SOFTWARE WAS USED, WHICH IS ABLE TO DESCRIBE THE CRACKING OF CONCRETE UNDER MECHANICAL LOAD. THE MODEL INPUT DATA ARE THE HARDENING AND SOFTENING LAWS OF CONCRETE, WHICH ARE DESCRIBED BY THE UNIAXIAL COMPRESSION/TENSILE BEHAVIOR OF MATERIAL AND THE LAWS OF DAMAGE EVOLUTION. BASED ON THE EXPERIMENTAL RESULTS, DIFFERENT LAWS OF TENSILE DAMAGE AS WELL AS CONSTITUTIVE MODELS FOR CONCRETE IN TENSILE AND COMPRESSION WERE EVALUATED. IN ORDER TO EVALUATE THE DYNAMIC BEHAVIOR OF THE STRUCTURE IN THE NUMERICAL MODEL, THE AUTOMATIC CALIBRATION OF THE FINITE ELEMENT MODEL BASED ON THE EXPERIMENTAL DYNAMIC RESPONSE BY GENETIC ALGORITHM WAS USED. WITH THE CALIBRATED NUMERICAL MODEL, METHODOLOGIES FOR ESTIMATING THE OVERALL DAMAGE OF THE STRUCTURE BASED ON ITS DYNAMIC PROPERTIES WERE PROPOSED. THE RESULTS SHOW THE INFLUENCE OF THE CDP INPUT PARAMETERS ON THE STRUCTURE RESPONSE AND CONFIRM THAT THE WELL-DESIGNED NUMERICAL MODEL IS ABLE TO EFFICIENTLY REPRESENT THE CYCLIC LOADING BENDING TEST, SHOWING VERY CLOSE MAXIMUM LOADING AND LOSS OF STIFFNESS DUE TO DAMAGE. IN ADDITION, THE PROPOSED GLOBAL DAMAGE ESTIMATES DEMONSTRATE THE COHERENCE BETWEEN NUMERICAL AND EXPERIMENTAL MODELS AND THE RELATIONSHIP BETWEEN DAMAGE AND DYNAMIC STRUCTURE PROPERTIES.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License [CC BY] that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).