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Thanks. It is more like a standpipe type tank located at MA. https://files.engineering.com/getfile.aspx?folder=bd49b929-772c-4419-a12c-6de709517cb0&file=Capture.PNG

We need to check the adequacy of an existing water tank for installing some proposed antennas and supporting mounts on top of it. Is IBC's rule, 5% and a 10% allowable increase in gravity and lateral loads, applicable to existing water tank? Or it has to be checked rigorously with AWWA D100...

Thanks to all for your input. ASTM A6 and the article flight7 provides both give useful information about my question. ASTM A6/A6M Section gives "tolerances define the acceptable limits of variation from theoretical dimension for the cross-sectional area, flatness, straightness, camber and sweep...

For example, a Channel steel shape: where I can find all geometric parameters defining the inner C of the C shape cross section, curves (radius) at the flange toe and web toe, slope of the flanges at the top and bottom inner C, etc. The AISC SCM gives basic parameters about section geometry and...

Appendix D has definition of "Anchor Group" and uses words such as "group of anchors" and "multiple ~ anchors with <some condition>". I am trying to understand how to identify anchors for above mentioned words for various capacity checking (breakout, blowout, etc.). Here are some of my...

I am reviewing ATC's tower calculation. On ATC's drawing, there are some structural info not familiar to me. For example, Leg Members: PLA 50 ksi 9*3/8"; PLA 50 ksi 7 7/16"*3/8". I can guess the material is 50 ksi but what are the member size by 9*3/8" and 7 7/16"*3/8"? Also, Diagonal...

The model is a pole base connection with stiffeners. The connection is composed of three parts, the baseplate, the pole and the stiffener. All three areas are contacting each other but not through each other. Please see the attached files for parts description. I create the areas for each part...

I have an ANSYS model which has been meshed already and the geometry (line, area and colume) info is no more available. New geometry objects are to be added onto existings and sharing boundaries with the existings. How can I mesh the new geometry objects so that they will use the same mesh at...

Any thoughts on generating the p-y curves as Lpile does? I wanted to generate the p-y curves as Lpile does using exactly the same soil info Lpile use. Lpile's technical manual has some information such as equations and tables, but I do not think that is adequate to generate the exactly the same...

How to match the mesh of new volume/area to existing mesh Hi, I have a meshed model with nodes and elements and the geometry info for volume and area are lost. Now I need to add some volume and area to the existing model. Is there any way I can make the added volume and area aumomtically meshed...

Based on the EOM, m*x_tt+c*x_t+k*x=f(t), if f(t) =m*a_g where the excitation acceleration a_g is the base/ground acceleration like earthquake loading, my understanding is that since the direction/sign of x and x_tt are unknown, the x_tt may be smaller/greater than a_g if x has the same/different...

Thanks for the information. Let me try and get back later.

I checked all ANSYS examples for using spring element with two nodes to model the response to loading in one certain direction. I can do that for any of the six DOFs, three translations and three rotations one by one. However, I do not know how to model all six dofs in one model using two nodes...

321GO, thanks for your reply. Though it is a basic fea tipoc, I do not think it is well understood to every people using FEM. I searched online and have not gotten a satisfied answer yet. Therefore, I posted this here.

Wondering why not a single reply. I did not make it clear or no one has interest in this issue at all? Thanks.

I am not sure about my understanding for some issues in nonlinear structural analysis using FEM. And want to ask your experts. Exclude material nonlinearity. In my understanding, there are two cases regarding nonlinear analysis. 1. nonliear global structural deflection and nonlinear local...

Aren't those tower mostly designed and manufactured by major tower companies such as Valmont, Sabre, etc.? To design, why not use RisaTower to do the calculation? There is some hand calculation examples at the website of Risa3D if you need it.

Thanks.. The "almost negligible" of the welds at sides is due to the negligible length of the welds at two sides when the location studied is "very close to the end but not the end yet". If no slippage assumption is still valid, the tension force in the plate is still to be determined using...

First, I want to correct one equation in my initial post: In "T = M*Sc/Ibr", Sc should be replaced with Q, the 1st moment of area. hokie66, thanks for your input. I know the design should be done as you said. About you answer, I want to ask more questions: ----hokie66 Just design the plate...

ishvaaag, thanks for your detailed input. Very helpful for my understanding of the overall of cover plate design. Currently, seems I am more stucked with the mechanics aspect concerning the connection within the terminal distance, from the theoretical cutoff end to the actual end. Thanks,