Under what conditions a Site-Specific Soil Behavior Analysis is requested

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ismail2982

New Member
ZF - TA and TB for Local Ground Class TA and TB for ZF - Local Ground Class could be entered in the first IdeCAD v10 version. But now I can't login. Will there be an update on this soon?
 
Re: ZF - site specific ground behavior analysis Hello; For ZF class soil, it is written in TDBY 2018 - Table 2.1 that site-specific soil investigation should be done and the coefficients that will enable us to obtain the spectrum are not given. For this reason, you need to transfer the spectrum you determined as a result of field-specific work to the program as a txt file from the defined section in the Analysis Settings - TBDY 2018 Design Spectrum tab. Good work.
 
Re: ZF - site-specific ground behavior analysis
"nurgulkaya":2sub9udh" said:
Hi; There will not be an update on this topic anytime soon, because there is no need for an update. ZF class ground For TDBY 2018 - Table 2.1, it is written that site-specific soil investigation should be done and the coefficients that will enable us to obtain the spectrum are not given. You need to transfer the spectrum you determined as a result of your u]field-specific work[/u][/i] to the program as a txt file from the defined section in the Analysis Settings - TBDY 2018 Design Spectrum tab. Good work.
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Isn't there a possibility to directly enter the coefficients and create the program?There is also only the import option.Even if there was an Export option, I could add in a suitable format accordingly.
 
Re: ZF - TA and TB for Local Ground Class Hello; To elaborate on the subject, TBDY 2018 directs to Section 16.5, with the need for site-specific soil behavior analysis for ZF in Table 2.1. First of all, it will be seen that consultancy is required when going to Section 1.3.2 due to the phrase site-specific soil analysis. When you go to Section 16.5, it is stated that site-specific soil analysis is mandatory for ZF, and procedure 16.5.2.5 explains how to process and scale with at least 11 acceleration records to determine the site-specific spectrum. Section 2.4 Site Specific Spectrum should be reviewed because of the phrase here. Since both site-specific soil and site-specific spectrum are within the scope of consultancy in the regulation and calculations cannot be made because the coefficients are not certain, if you have ZF soil type, you should import the spectrum you obtained as a result of the above-mentioned regulation studies into the program under the Define tab. You can do this step by step as follows: 1 - Activate the Define box. 2- Check the import settings. 3- Import the txt file into the program with the import option. 4-You can see the spectrum formed by clicking OK and complete adding it to the structure tree. With the import option, you adapt the spectrum to your project. In the next steps, the other analysis and design steps you have made in the program continue as normal. We will ask you to explain what you want to do with Export. Good work.
 
Re: ZF - TA and TB for Local Ground Class Thank you for your explanation. I did as you said, but after entering the values, I save and analyze. However, my previous choices still apply. When the report is received, it does not write ZF for the Ground Group in the report. It's not defined either. It writes the old parameters. In the first version you published, ZF was not written, but I entered TA and TB.
 
Re: ZF - TA and TB for Local Ground Class Hello; After the spectrum assignment you have added as defined in the Design Spectra section of the structure tree is made, you must select the spectrum you defined for Ex and Ey from the Design Spectra Status section. If you want to be sure, after doing this, delete the spectrum that you had the program calculate before from the structure tree. Meanwhile, please make sure your spectrum is Sar(T). Analyze after performing this operation. Defined spectrum phrases are included in the Earthquake Regulation sections of the optional report. Now you can see that the other spectrum is not used. However, the report still includes parameters such as default Ss and S1. Remove them from the report. The editing in the report continues as software. You can remove the additional page from the report for the ZF class floor until the editing is complete.
 
Re: ZF - TA and TB for Local Ground Class The program does not generate spectrum for you. It uses what you give it. The defined spectrum you created is the horizontal spectrum. For Dusey, you can give another spectrum if you want. Dusey can use it in an earthquake.
 
Re: ZF - TA and TB for Local Ground Class
"Ismail Hakki Feeds":4ya1yfp8" said:
The program does not generate spectrum for you. You can give another spectrum for Dusey if you want. You can use it in Dusey earthquake.
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Re: ZF - TA and TB for Local Ground Class Hello; If there are no 4 types of situations in your project as per TBDY 2018 - 4.4.3.1, the vertical earthquake effect is determined using Equation 4.10. In order for the vertical earthquake effect to be used as a spectrum in the program, you must select these elements and mark the vertical spectrum part from the TBDY 2018 sub-tab from their properties. As with the horizontal spectrum, you must define the vertical spectrum from the structure tree and assign it to Ed (Z). However, if you do not have these 4 cases in your structure, you do not need to do anything, the program automatically applies the equation 4.10 formula. In this case, you can remove the vertical spectrum from the report. Since the information is automatically defined in the report, the entry is unique, it is printed the same. Precautions will be taken for this situation in the future. Good work.
 
Coefficients in ZF floor class selection Hello. When we want to select the soil class as ZF and have analysis done, some coefficients must be given by the user. Only Ss and S1 spectral acceleration coefficients and Ta and Tb period values are not sufficient for the design spectrum plot. Fs and F1 local effect coefficients TBDY 2018 16.5.2.5. It is required to be calculated in accordance with Art. As a result, the design spectral acceleration coefficients Sds and Sd1 are calculated. In the latest version, V14, when Ss, S1, Ta, Tb values are entered and analyzed, the Sd1 value in the software is different from what I found, although there is no ZF. At the same time, TBDY 2018 4.9.1.4 in ZF analysis. Since the lambda coefficient selection depends on the DD2 and DD3 data, it can be correct to always take the 0.66 acceptance as a defined value, as per the article. I would be happy if you share your information.
 
ZF floor class coefficients Hello. There is something in the software that I have trouble understanding the accuracy of. I give the following information for an example of a small three-story building. The result of the analysis after the ZE floor class selection, for example, the relative storey drift value of the S1 column seems to be calculated as 0.0121 mm. When the defined soil type ZF is selected and analyzed with the same Ta and Tb period values and the same Ss,S1 map spectral acceleration coefficients, the relative story drift value of the S1 column is calculated as 0.0941mm. There is a difference of almost 10 times. I think the problem (TBDY 2018 4.9.1.3 and 4.9.1.4) is caused by the lambda coefficient. Defined value 0.66 is given in non-ZF analysis. How can we explain the changing situation when we analyze without changing the defined value in ZF analysis. In other words, how can this difference be in a situation where we do not change anything in terms of value. Is there a software point, a breakpoint, a breakpoint?.
 
Re: ZF floor class problems Hello; Make sure that the spectrum you defined in ZF type is Sar(T). That is, it must have been processed in the necessary ways with R and D. At the same time, make sure that the R, D and I values in the analysis settings are entered correctly in the program. For the lambda value, you need to know and calculate the values of ZF for DD-3. 0.66 default is an approximation. Detailed explanation is available in the attached pdf. After you are sure of the data entry suitable for the pdf, you can review your project again. It has been confirmed that there are no errors in the 10.14 version of the projects that have previously received support regarding this issue. In summary, the program does not have a breaking point. However, if you have problems despite following the instructions above exactly, please share your project and the spectrum information you use for ZF. Good work.
 
Re: ZF floor class problems First of all, thank you for your reply. I'm deducing the following from your answer. Reduced design spectral acceleration values and lambda coefficient given in 4.9.1.4 are calculated by the software for soil classes other than ZF soil type. However, when the ground type is ZF, the reduced design spectrum SaR(T) values and lambda coefficient are required to be entered by the user. I think it will be a troublesome process for superstructure engineers that the design spectral acceleration value, which is found as a result of 11 acceleration records by the relevant articles of the regulation, is requested by the user to be used by decreasing it according to item 4.8 and the analysis of the lambda coefficient according to the DD2 and DD3 earthquake ground motions. Friends who are far from the geotechnical area, DD2 and DD3 earthquake ground movements etc. about the ground. Although I sincerely want them to be able to make the necessary analyzes on the issues correctly, I think it should not be forgotten that troublesome results may occur. As a suggestion, the design spectra obtained according to the DD2 and DD3 earthquake ground motions are defined separately and without reduction in the software, and the reduced design acceleration spectrum is analyzed by the software in accordance with item 4.8, and if the lambda coefficient analysis given in item 4.9.1.4 can be made regarding the relative storey drifts, I think. Many possible errors can be avoided. Best regards
 
Re: ZF floor class problems Hello; First of all, there is no one-to-one connection between 11 acceleration records and ZF type. One spectrum is used in linear dynamic analysis, this spectrum is defined for ZA-ZE in the regulation, and for ZF, as a result of site-specific work, the design engineer is informed by the Ss, S1, Sds, and Sd1 parameters and the Sae(T) of the elastic design spectrum, DD-2 and DD. It should be given for -3. In short, you should have one elastic design spectrum at your disposal. After this point, the design engineer should read the acceleration value corresponding to the dominant periods in the x and y directions of the structure from the elastic spectra and make DD-3/DD-2 for lambda calculation. Currently, one lambda is taken in the program, so enter the unfavorable one of the 2 lambdas you have calculated into the program. Calculation of reduced spectrum is a calculation that can be done quickly by using two formulas in excel. It consists of placing the Ra values determined using equations 4.1a and 4.1b into equation 4.8. However, notes have been taken to facilitate the process. Good work.
 
Re: ZF soil class problems It is a site-specific spectrum specialist job. An expert does this with ease. The average user usually has nothing to do with site-specific spectrum. The engineer with site-specific parameters can complete the information entry by following the instructions in the attached pdf file. If there is a general request to make it more practical, I'm bringing this topic up for the sake of other users who need field-specific spectrum. The attached pdf will help you.
 
Re: ZF floor class problems Thank you for your attention. My aim is to make criticisms and suggestions for making the software more perfect. I can never have any intention of competing with plain or detailed technical information on this platform or any other platform. I hope I am not misunderstood that way. If and only if I can bring the question to the minds of those who prepare the software, I will be happy. I will continue to express my views on an understandable and plain level. Best regards
 
Hello everyone... In a project we have done, our building turns out to be BYS 3. Soil and Foundation Investigation is included in Category 3 according to the Implementation Principles. Our ground is almost ZB, but ZC was taken in the reports, bearing capacity is 115 t/m² (Solid Rock). The Administration requests Site Specific Soil Behavior Analyzes from us. Our ground is not ZF, there is no pile in the foundation. In this case, when you make these analyzes, design supervision comes into play. Can I have your comments on whether it is normally required or is it unnecessarily requested? When the administration's first review on BYS 3 in the new regulation, they scrutinize it a bit. Thank you from now. Good work everyone...
 
Hello there; Site-specific soil behavior analysis or site-specific spectrum study requested from you is mandatory in ZF and BYS<2, but may be requested by control authorities in other cases. There is no clearly written obligation clause in the regulation. We recommend that you review Chapters 2, 3 and 4 in detail. Good work.
 
Thank you for your reply, Ms. Nurgül... It is not in our regulation. It shouldn't be wanted anyway. However, in the Circular of the Ministry of Environment and Urbanization titled Soil and Foundation Investigation application principles, the buildings included in the article 5, including bys 3, were evaluated in category 3. He stated that there is a deficiency in my opinion at the moment, but it should be done. The administration is right according to this now. We receive TGUA-1 and TGUA-2 services for them. We have made a notification in the circular, I think it will continue like this until it is corrected. Since our project will be approved by Environment and Urbanism, it has been scrutinized for a long time. If there were municipalities, maybe they could ignore it.
 
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