Quaqua frequency analysis9/3/2023 ![]() Difference between 2 results occurs because of this. In this case, software’s value is more reliable because at the modeling and assembling phases interactions between reinforcements to plate, material properties, section properties have been assigned. Natural frequency could also be found via using 2 formulas below įigure 11 Displacement of the model under 723N of total force from HW2įrequency found via Abaqus software is 37.8 Hz where simple hand calculations gives us the value of 29.2 Hz. Some of the cases are just mirrored versions of the other one’s but it is crucial to have that knowledge in design phase. There have been 10 different failure scenarios occurred in 10 different frames during first step. Table 2 Obtained damping values due to frequencies on ready to use excel worksheet Damping ratio ‘ξ’ taken as %5 in this process. Ready to use excel sheet has been used to obtain the structural damping ‘β’ and mass damping ‘α’ values. Table 1 Natural Frequencies of the model in 10 different frames Self natural frequency of the model has been calculated in the first step. In the second step, we are asked to use the first step’s outputs as an input to find the structural damping and mass damping values and apply a 150 Newtons of distributed load on flat surface of the model. After this process, analysis will give the natural frequencies of the model as 10 different modes of outputs. If any load is applied, there will not be a problem since Abaqus software will override the input onto the assigned load. Methodology of finding the natural frequency of the model is defining a frequency in Step-1 without applying any load. This model has 3 reinforcement bars attached to a plate and fixed on one end. Main objective of this project is to measure the natural frequency of the model created in HW-2. It will have huge impact if an earthquake engineer does not know about the frequency of structures. In the second step it is obvious that the stress generated on the model due to applied load exponentially increases while frequency approaches to natural frequency. There may also be one more reason for that which is when stiffness was calculated, only elastic deformation took place. Since, software has many inputs like material, interactions, model dimensions etc., in hand calcualtions, only property used from model was the mass and stiffness. Abaqus software’s value(37.8) is %30 higher than the simple calculations result (29.2). Since there are two different analysis methods, of course there are two different results. In this report, natural frequency of reinforced plate has been found either on Abaqus Software and with the stiffness-frequency formulas. You can review the reports and tasks more easily with the drive link below Natural Frequency Extraction and Frequency Response Analysis
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