For a box culvert structure (similar to the one in the video) - 1) Is the top & bottom slab thin plate or shell element? 2) Is the side walls thin plate or shell element?
plate elements are typically used to analyze structures where the thickness of the plate is much smaller compared to its other dimensions. They capture both the bending and axial deformation of a plate. Shell elements are primarily used to model structures where bending behavior is dominant. They are also two-dimensional elements, but they mainly focus on capturing the flexural response of a structure. Shell elements are not designed to capture axial deformations, and their usage is appropriate when the primary deformation mode is bending. If you want a simplified analysis and your culvert structure has relatively small deformations and is not subjected to complex loadings, you can model the top and bottom slabs as thin plate elements. If you require a more detailed and accurate analysis, especially when dealing with thicker slabs or complex loading conditions, you may choose to model the top and bottom slabs as shell elements. Shell elements are better at capturing the behavior of structures with more significant deformations and varying thicknesses. Here i have done an analysis of box culvert(using shells): th-cam.com/video/XUeALSXx78s/w-d-xo.html Hope i answered your question :)
Hello, thanx for the video. Etabs/CSi states that the moments m11/m22 are per "unit of in-plane length" KNm/m. what does that mean in terms of design? I need to time it by the length of the element? ( in your example the length of the square?). Also, when you want to use the results in table form ( so that you can export to excel and design the reinforced concrete), you find that the moment and the forces are given in each node of the element, rather than at mid span where one would expect it. I guess what I am asking is how do I get the moment in kNm at center of element?
When the software states that the moments are given "per unit of in-plane length," it means that the reported values are normalized by the length of the element in the plane of interest. In other words, the moments are provided on a per-meter basis along the relevant axis. To obtain the total moment for a specific element, you would indeed need to multiply the reported value (m11 or m22) by the length of the element along the axis of interest. If you need output at the middle, simply you can define a node at the middle. These are finite element packages. They calculate information at the nodes you provide
Thanks for this video!!! :) I want to ask a question. I want to find the maximum principal tensile and compressive stress on the structure. For this, I examined the Smax and Smin values. While compressive stresses are larger at Smax values, tensile stresses give larger results at Smin values. With which principal stress result should I compare whether the strength of my material properties is exceeded or not?
The determination of whether a material has exceeded its strength depends not only on the principal stresses but also on the specific failure criteria used. Different failure criteria take into account various factors such as yield strength, ultimate strength, material properties, and the stress state. So while principal stresses are important for understanding the stress distribution within a structure, the ultimate determination of failure typically involves comparing these stresses to the material's strength using appropriate failure criteria.
I am pursuing m tech this video has helped me alot to differentiate and cross verify the theoretical text what i am studying, can u make some more videos like on topic shear walls, temperature effects etc
Thank you awesome explanation. I learned a lot. I just need some help though , Some values of my shell for M12 from the tables are not matching from the model if I display the M12. Example the node 1, the M12 from the table is -9.0 but from the displayed model it’s + 20(when I drag the cursor and point it to node 1 the values shows +20). I checked the combo from Table and model it’s the same. It only happens on some nodes
Thank you!! One question -- the bottom left shows the maximum and minimum results for your model. Is there a way to only display the maximum/minimum results from one portion of the model? For example. I have a model with a base mat and walls and I only want to see the maximum/minimum moments on the slab. If I hide the wall elements, it still shows the maximum moment on the wall, rather than the slightly smaller maximum moment on the slab.
@@Structural_analysis thanks! It's just frustrating because it is showing a maximum moment of 42 kips which occurs on the wall, and I'm designing the base mat
Sir Is it possible to get moment capacity as output while designing slabs in SAP 2000 software , by giving input as (assumed area of steel in X and Y directions and corresponding spacing) .
Sir if your model a.k.a Box Culverts applied response spectrum analysis, how to show stress area? Because response spectrum result in sap2000 is displacement and response modal or acceleration?
The output of this analysis typically includes the displacement and acceleration spectra for each mode of vibration. In SAP2000, you can obtain the maximum stresses for each mode by selecting the "Modal" option in the "Output Case" dialog box and selecting "Maximum" for the "Stress" output option. To visualize the stress area, you can use a variety of tools available in SAP2000 or other software packages. One common way to do this is to create a color contour plot of the stresses over the structure. This can be done by selecting the "Display Options" tab in the "Display Settings" dialog box and choosing the "Contour Color" option. You can then select the appropriate stress component (e.g., axial, bending, shear) and specify the contour intervals and color scheme.
a random guy saving the day as always. thx TH-cam , and thx to you
Thank you for explaining those M11 and M22 concept and Showing it on SAP 2000. I cleared and Understood my issue regarding it😊
Thanks Brother
For a box culvert structure (similar to the one in the video) -
1) Is the top & bottom slab thin plate or shell element?
2) Is the side walls thin plate or shell element?
plate elements are typically used to analyze structures where the thickness of the plate is much smaller compared to its other dimensions. They capture both the bending and axial deformation of a plate. Shell elements are primarily used to model structures where bending behavior is dominant. They are also two-dimensional elements, but they mainly focus on capturing the flexural response of a structure. Shell elements are not designed to capture axial deformations, and their usage is appropriate when the primary deformation mode is bending.
If you want a simplified analysis and your culvert structure has relatively small deformations and is not subjected to complex loadings, you can model the top and bottom slabs as thin plate elements.
If you require a more detailed and accurate analysis, especially when dealing with thicker slabs or complex loading conditions, you may choose to model the top and bottom slabs as shell elements. Shell elements are better at capturing the behavior of structures with more significant deformations and varying thicknesses.
Here i have done an analysis of box culvert(using shells): th-cam.com/video/XUeALSXx78s/w-d-xo.html
Hope i answered your question :)
the most useful video on local stresses
thanks alot
You are welcome brother
Thank you.
Hello, thanx for the video. Etabs/CSi states that the moments m11/m22 are per "unit of in-plane length" KNm/m. what does that mean in terms of design? I need to time it by the length of the element? ( in your example the length of the square?). Also, when you want to use the results in table form ( so that you can export to excel and design the reinforced concrete), you find that the moment and the forces are given in each node of the element, rather than at mid span where one would expect it.
I guess what I am asking is how do I get the moment in kNm at center of element?
When the software states that the moments are given "per unit of in-plane length," it means that the reported values are normalized by the length of the element in the plane of interest. In other words, the moments are provided on a per-meter basis along the relevant axis.
To obtain the total moment for a specific element, you would indeed need to multiply the reported value (m11 or m22) by the length of the element along the axis of interest.
If you need output at the middle, simply you can define a node at the middle. These are finite element packages. They calculate information at the nodes you provide
Thanks for this video!!! :) I want to ask a question. I want to find the maximum principal tensile and compressive stress on the structure. For this, I examined the Smax and Smin values. While compressive stresses are larger at Smax values, tensile stresses give larger results at Smin values. With which principal stress result should I compare whether the strength of my material properties is exceeded or not?
The determination of whether a material has exceeded its strength depends not only on the principal stresses but also on the specific failure criteria used. Different failure criteria take into account various factors such as yield strength, ultimate strength, material properties, and the stress state. So while principal stresses are important for understanding the stress distribution within a structure, the ultimate determination of failure typically involves comparing these stresses to the material's strength using appropriate failure criteria.
th-cam.com/video/xkbQnBAOFEg/w-d-xo.htmlsi=4rqgc52Nuoi_DLea
I am pursuing m tech this video has helped me alot to differentiate and cross verify the theoretical text what i am studying, can u make some more videos like on topic shear walls, temperature effects etc
Sure Brother
Excellent explanation, thank you👌👌
thank youu
thank you sir
Thank you awesome explanation. I learned a lot. I just need some help though , Some values of my shell for M12 from the tables are not matching from the model if I display the M12. Example the node 1, the M12 from the table is -9.0 but from the displayed model it’s + 20(when I drag the cursor and point it to node 1 the values shows +20). I checked the combo from Table and model it’s the same. It only happens on some nodes
I think It’s reading the average from that node that’s why I’m getting different values.
@@johnreealimorong4586 you may have done some mistake while reading the output.. did you check it again?
Thank you
You are welcome 😊
Thank you!! One question -- the bottom left shows the maximum and minimum results for your model. Is there a way to only display the maximum/minimum results from one portion of the model? For example. I have a model with a base mat and walls and I only want to see the maximum/minimum moments on the slab. If I hide the wall elements, it still shows the maximum moment on the wall, rather than the slightly smaller maximum moment on the slab.
For the combination. Make the envelope.. as i remember, Sap 2000 shows minimum and maximum for the envelope
@@Structural_analysis correct, but it is showing the min/max for the entire structure when I just want to see the min/max displayed for the base mat
Yeah.. i havent also seen such.. i will check the manual and let you know
@@Structural_analysis thanks! It's just frustrating because it is showing a maximum moment of 42 kips which occurs on the wall, and I'm designing the base mat
thanks very helpful
You are welcome 😍😍
Hello, can you use SAP2000 for FEM analysis using plates?
yes brother. we can. plates are there in the element selection options
Sir
Is it possible to get moment capacity as output while designing slabs in SAP 2000 software , by giving input as (assumed area of steel in X and Y directions and corresponding spacing) .
Havent used design option for a while..but as i remember, yes you can take it.. but not as an output.. its is mentioned in the detailed calculation
Sir if your model a.k.a Box Culverts applied response spectrum analysis, how to show stress area? Because response spectrum result in sap2000 is displacement and response modal or acceleration?
The output of this analysis typically includes the displacement and acceleration spectra for each mode of vibration. In SAP2000, you can obtain the maximum stresses for each mode by selecting the "Modal" option in the "Output Case" dialog box and selecting "Maximum" for the "Stress" output option.
To visualize the stress area, you can use a variety of tools available in SAP2000 or other software packages. One common way to do this is to create a color contour plot of the stresses over the structure. This can be done by selecting the "Display Options" tab in the "Display Settings" dialog box and choosing the "Contour Color" option. You can then select the appropriate stress component (e.g., axial, bending, shear) and specify the contour intervals and color scheme.
Thanks so much, it was a great knowledge.✌️✌️🌹🌹🌹☘️☘️🌚👻
you are welcome brother🙂
@@Structural_analysis Thanks a lot, you are also always welcome to my channel😇.
very usefull ...have you some explaination about shell forces in circunferencial and perimetral directions at circular slabs using sap2000?
I havent come across such different expalantion. If it is i will update it for sure. For example, shell output consist of these options only.
very helpful
Thank you brother
I really got confused now
??
Sound quality is too poor.