Computer Simulation and Numerical Analysis of Damaged Beams Reinforced With Fiber Concrete

Abstract

The results of computer modeling and finite element analysis of damaged beams reinforced with fiber concrete are presented. The work uses two software complexes ― SOFiSTiK and Autodesk Robot Structural Analysis. Previously, experimental studies of beams damaged in the stretched or compressed zone, reinforced with steel fiber concrete, were carried out. At the same time, the bearing capacity of two groups of reinforced beams was determined. The first group consisted of three samples (ZBP1, ZBP2, ZBP3) that had damage to the compressed zone; in the second group there were two samples with damage in the stretched zone (ZBP4, ZBP5). In addition to the bearing capacity, deflections and relative longitudinal deformations are determined for each sample. At the same time, crack formation in the undamaged beam and in the damaged beams reinforced with fiber concrete was investigated, the load at which the first crack formed, the total number of cracks, and the initial and final opening width of each of them were recorded. In order to evaluate the obtained results of experimental studies, computer modeling and finite element analysis of reinforced beams were carried out. It is established that the deflections and loads obtained as a result of calculations in the Robot Structural Analysis program are slightly higher than the same values obtained in SOFiSTiK. The maximum discrepancy in deflections is observed for sample ZBP5 and is 1.52%, in stresses ― for sample ZBP3 (15.6%). Comparing the results of calculating the maximum stresses in SOFiSTiK with the results of experimental studies gives a maximum discrepancy of 5.85% (sample ZBP3). And the biggest discrepancy between the data of the experiment and the numerical analysis occurs in the deflections ― here it fluctuates in the range of 19.0÷19.2%.