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Turkish Hello there. What is nonlinear analysis method, how is nonlinear analysis done with İdecad? What should be considered when performing nonlinear analysis? Can the Nonlinear Analysis method be applied in all buildings, including low-rise buildings? Can more realistic results be obtained with the nonlinear analysis method? Where can I learn the explanations of the parts shown on the Nonlinear push analysis options page that appears when the nonlinear analysis button is pressed? +x+3Y, Fixed, variable mode etc, Iteration detail surface..
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What is the Nonlinear Analysis method
- Thread starter ganymede
- Start date
Ismail Hakki Besler
Administrator
Re: Nonlinear Analysis method
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There are detailed explanations about the SGDT Nonlinear Analysis method in this link. And at the same time, which controls ideCAD does are shown with green ticks at the beginning of each section. As follows:
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Re: Nonlinear Analysis method Thank you. I would also like to thank you for adding such a feature (Nonlinear Analysis method) to the program. After analyzing my projects, I also do nonlinear analysis and look at the results. your elements = <KH bölgesinde olup olmadığını ve tüm elemanların sünek olup olmadığını kontrol edebiliyorum. Kolonlarda plastik mafsal oluşup oluşmadığını tam kontrol edemiyorum. Olsa sünek eleman olarak gösterilmez herhalde. Araştırıyorum. Bu en önemli konularımızdan biri bence. Umarım forumda daha çok tartışılır ve biz de çıkan yorumlardan istifade ederiz. Saygılar.
Re: Nonlinear Analysis method Hello;
Nonlinear analysis methods are a design approach that applies the Evaluation and Design Based on Strain (ŞGDT) approach described in TBDY Chapter 5. To put it briefly, earthquake effects of buildings It is used to determine the level of performance below and to find the damage rates of the elements.It can be applied in all buildings, including low-rise buildings, but some conditions must be met according to the analysis method.For example, in order to perform a single-mode pushover analysis, the mass contribution of the dominant mode of the building is above 70% Links sent by Mr. İsmail are the ideCAD Knowledge Base. You can get detailed information by examining the relevant headings and sub-headings here. If you examine the links below and their sub-headings, the ideCAD Static software of TBDY Chapter 5 and the evaluation of existing buildings, the related chapter TBDY in n You can examine the actual implementation in detail."ganymede":79is9yqb" said:What is nonlinear analysis method,
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Best regards...Re: Nonlinear Analysis method Hello;
Nonlinear analysis methods are a design approach that applies the Evaluation and Design by Shapeshift (ŞGDT) approach described in TBDY Chapter 5 In short, it is used to determine the performance level of the buildings under the effects of earthquakes and to find the damage rates of the elements.It can be applied in all buildings, including low-rise buildings, but as I mentioned above, some conditions must be met according to the analysis method. These are Constant unimodal pushover analysis, variable unimodal pushover analysis and Incremental Spectrum Method and pushover analysis (abbreviated as ARSA, it is a multimodal pushover analysis method). You can find detailed steps of these methods here ("ganymede":i90sf0vg" said:What is the nonlinear analysis method, how to do nonlinear analysis with İdecad?
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,
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) While performing nonlinear analysis, plastic behavior of the elements is taken into consideration and modeling is done accordingly. Stacked plastic behavior model is applied for columns and beams. This model is created by placing plastic hinges at the ends of columns and beams. Plastic hinge properties are also calculated based on cross-section dimensions, reinforcement placement and material models. (For detailed information
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). For curtains, plastic behavior is created with a distributed plastic behavior model. (for detailed information:
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). Floors and basement curtains are modeled linearly. After this modeling, one of the pushover analysis methods is selected and the thrust curve of the structure is extracted. The performance point is found on the impulse curve by transforming the spectrum curve and the thrust curve accordingly. The performance of the structure is also determined by the plastic rotation and unit deformation values at the performance point. ideCAD does this in accordance with TBDY Chapter 5.
Nonlinear analysis always gives more realistic results in determining the earthquake performance of the building. However, the nonlinear behavior must be defined appropriately. ideCAD uses the "Moment-curvature" analysis to create the plastic hinge model and the interaction curve. Nonlinear analysis does not give a result only for usability cases (deflection calculation). In TBDY Table 3.4, it is indicated in which cases DGT and in which cases SGDT approach is sufficient."ganymede":i90sf0vg" said:Can more realistic results be obtained with the nonlinear analysis method?
You asked, "I cannot fully control whether plastic hinges form in the columns" for the Nonlinear Analysis method. I would like to give an answer to this from the program interface. After performing nonlinear thrust analysis, right-click "Analysis system display options" and select "nonlinear thrust X+0.3Y" (or any other thrust condition) thrust condition from "Deformation" tab. You can examine the plastic joints and damage conditions that occur in each step. On the left of the three-dimensional display screen, there are colorings indicating the damage status of the plastic hinges. You can examine the states of the plastic hinges at which end of each element from these colors. The blue dots in the picture below are where the plastic hinges form. Blue color means that it is at KH level. You can find detailed information about the definition of plastic hinges in the links I will give."ganymede":i90sf0vg" said:I cannot fully control whether plastic hinges are formed in the columns
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, When you click on any plastic joint, you can see the details about that plastic joint. Plastic rotation values, internal force conditions and damage conditions are also seen in these details. For detailed information about the evaluation method;
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,
Direction options show which direction the pushover analysis will be made under the influence of which coefficients. Since the superposition principle is not valid in non-linear analyses, analyzes should be done separately for all cases. Since this takes some time When checking projects at first, only the dominant aspects (eg X+0.3 and X-0.3Y) can be analyzed and checked.When checking your project at the beginning, you need to take all these two combinations into consideration when making the final evaluation. structure available in The analysis option is specified according to whether it is a structure or a new structure. There are differences in terms of material model and evaluation between the building being an existing structure and being a new one. The level of knowledge creates differences in the material model according to the situations specified in TBDY 15.2.4 and 15.2.5 in existing structures. In the Pushover Analysis Method, you can choose any of the pushover methods specified in TBDY Section 5.6. One of the unimodal pushover analyzes can be used for this structure. Iteration detail level is also an opportunity that affects the analysis time. A level of 1 sensitivity is lower, while a high sensitivity of 5 means longer analysis time. Having 3 is ideal. Second-order effects can be taken linear for this structure. Accepting the second-order effects in the intermediate steps of the thrust analysis as linear does not make a significant difference for reinforced concrete structures. The Curtain Material Model should not be linear."ganymede":i90sf0vg" said:Where can I find the explanations of the parts shown on the Nonlinear impulse analysis options page that appears when the nonlinear analysis button is pressed? +x+3Y, Fixed, variable mode, etc., Iteration detail surface, etc..
Besides, it is about ductility control; There is no plastic behavior related to the shear force, which is the internal force that causes brittle collapse. It is also desired to prevent damage caused by shear force. Therefore, the shear behavior used in ductility control is linear behavior. At the performance point in the thrust analysis, the shear forces formed in the elements must be smaller than the shear strength If this is the case, the element is considered brittle if it is not ductile Detailed information"ganymede":i90sf0vg" said:I cannot fully control whether plastic hinges are formed in the columns. If it were, it would not be shown as a ductile element. I am researching. I think this is one of our most important issues
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You can also review the thrust analysis results from the reports. When the report is received, you can examine the material models, the plastic hinge conditions in the elements, the damage caused by the diffuse plastic behavior on the curtains and the performance of the building. Best regards...