On which results/report the final decision for the winning team will be based?
- Winner will be decided according to results provided in 2nd Participants report. You will be able to calibrate initial model (from “pre-test”) with tested material properties and earthquake records obtained from shake table, so those data will be at your disposal after we conduct all necessary experiments (second report – “Material Properties Report”). All criteria will be specified in detail in ”Material Properties Report”.
- In the “pre-test” (first report – “Design Report”) and “post-test” phase (second report – “Material Properties Report”) – participants must fulfill the same report, with the maximum absolute displacements of points A and B, the maximum absolute value of shear base in both directions, and displacement vectors of all floors (DISP_X_ #). For a decision on the final winner – only the results from the “post-test” phase will be evaluated – thus only displacement vectors of all floors (DISP_X_ #) – calculating Root mean square (RMS), while the results from the “pre-test” phase will be used only for the comparison, and for Post-FRAMA-2015 Workshop.
Is there a certain format for the reports that participating teams should use?
- Participants should use a form given in FRAMA Project Documentation under the name Annex A – FRAMA-2015 Participants Report.docx and also should supply 3 text files associated with the three intensity levels as it is described at the end of Annex A.
What are the results absolutely required to be included in the first submission?
- We will be very pleased that you provide us with as many information as you can pull out from your numerical model (for all the fields that are required to fill in descriptively – within participant’s report).
Which kind of tests we will have for the constituent materials?
- Regarding the mechanical properties of materials, participants will be provided the following data:
– Reinforcement bars – tensile test, stress-strain diagram, on the basis of which you can specify almost all the necessary parameters,
– Concrete – modulus of elasticity and compressive strength at 28 days (testing will be conducted on concrete cylinders),
– Hollow masonry units – compressive strength in both vertical and horizontal directions (block dimensions with the disposition of vertical holes will be also available),
– Mortar – compressive and tensile strength at 28 days,
– Masonry walls – compressive strength only in vertical direction (parallel with the direction of vertical holes), diagonal tensile strength (compression on the diagonal).
Which is suitable for the meaning of “Base Shear”: the story shear force at 1st story, or the total shear force below the fundation?
- The term “Base Shear” is considered to be the total shear force at the base of the columns at the ground floor - a total sum of 6 columns. The foundations are considered to be very stiff, so we are looking at the shear force at the base of the columns, and not at the base of the foundations (in the case if you are modelling the foundations).
Shoud we use the independent 3 input acceleration data in the dynamic analyses for preparing 3 text files or the unified data?
- Ground motion records are offered in the two forms: as three separated intensity levels, and the complete record with merged (unified) all three intensities. Your choice depends on the application/software you are using, but total displacements vectors should contain the same number of samples as the complete ground motion record. It should be noted that for each additional intensity level ”structure should remember the damage” caused by the previous ground motion intensity. So it is often suggested to use the complete record. In the post test analysis, participants will receive a complete ground motion record of all the actual intensities on the seismic platform during the experiment.
How to fulfill the tables in the Participant’s report?
- The tables need to be fulfilled with an “X” symbol – if you have used one of the listed (Table 1), global/semi global models, types of elements, FEM models and etc. In Table 2 is enough to mark “X” for load protocol used in Pushover analysis, and what results you can get after performing Pushover analysis (based on which we will prepare participant’s report for “post-test” phase). In Table 3 is enough to enter the values of the first three frequencies of the structure, and just indicate the direction of oscillation (longitudinal, transverse, torsion). The “modified” refers to the frequencies after the seismic excitation, in other words, if you can get the frequencies of the structure after damage and nonlinear behavior. In Table 4 “Values of dumping” refers to the same thing as a frequencies of the structure before and after the excitation, if it’s not applicable just leave it blank or write N/A. “Failure criteria” actually refers to the “Performance criteria” defined in the analysis.
- So the tables have mostly descriptive character, rows in the tables can be marked with “X”, left blank or marked with N/A, except for values of the frequency and damping. Also, if you use some of assumptions of the model not listed in the tables – feel free to add them.
Can we possibly modify our “pre-test” model for “post-test” phase? Or we should only update the parameters of the material characteristics?
- In your “post-test” model (compared to the current “pre-test” model), you will not be limited in modifying – not just material characteristics, but also any details on the model – as long as you feel it necessary.
Why do we need to send the results of “pre-test” model, and again of “post-test” model?
- Regarding the preliminary (“pre-test”) results, they will be used to compare models of each team in Post-FRAMA-2015 Workshop, during which it will be interesting to compare the responses of the structure using only limited information on materials (nominal characteristics), which often have structural designers in practice. So the announcement of the final winners will be based only on the “post-test” results.
Is there a difference in the curing of concrete specimens (cubes and cylinders) in relation to the model (beams, columns and slabs)?
- Concrete specimens (cubes and cylinders), on the basis of which are given the material properties (second report), are kept for 28 days under water, which we consider a full 28 days of water-curing. While the structural model was water-cured only on the second day after the concreting, followed by 26 days of air-curing.
Which are positive directions for input acceleration, and which for the storey displacements, according to the report on the “post-test” phase of the competition?
- The positive direction of the results (storey displacement vectors) is directed toward the right, according to Figure 5 from the “Material and Construction Report”. If necessary, this can be corrected after the analysis. Also the first step of the input acceleration (positive value of acceleration) is directed toward the left, also according to Figure 5.