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Hi everyone Any PDA expert here? Is PDA reliable? Can someone please recommend any literature on PDA or any work examples to calculate pile soil resistance from PDA results? I also came across this formula below. Quite a lot of questions popped into my head. How was this formula derived? What...

Hi everyone Any PDA expert here? Is PDA reliable? Can someone please recommend any literature on PDA or any work examples to calculate pile soil resistance from PDA results? I also came across this formula below. Quite a lot of questions popped into my head. How was this formula derived...

Hi Is bitumen-coating on precast RC pile to reduce drag-down common? Is it efficient and reliable? What should be the percent reduction in negative skin friction? Is there any code or reference that I can refer to for my calculation and material specification? Thanks

Hi How do I prevent structural steel member bolts subject to machine vibration from loosening? I did some research online, I found this wedge lock washer and castle nuts. Are those good enough? Is preloading the bolts better? What do you guys usually do? Thanks

Hi How do I get the soil spring stiffness/subgrade modulus/Winker constant for Mat foundation or pile modeling in my 3D model? from pile ULT tests? plate load tests? lab triaxial tests? Any quick theoretical formula? I know that I can get those from a geotechnical engineer but in my region...

Hi Everyone, As you can see below, in Eurocodes, if αcr < 10 then need to consider P-Delta. I can understand individual member Euler buckling but I am struggling to understand what this Fcr elastic critical buckling load for global instability is? Can someone please walk me through the steps to...

Hi I noticed that in precast construction, neoprene bearing pads are quite commonly used but I couldn't seem to find any info on its bearing/compressive strength (only hardness is specified). What is the conservative compressive strength value that I should assume or is there any correlation...

Hi This afternoon, I was calculating the lateral pressure of fresh concrete on wall formworks. Conservatively I was using ρ H (density x height) without considering placement rate, temperature, etc.. then I came to realize that the wall thickness (i.e. width of the fresh concrete) does not...

Hi Everyone, Good Morning I am new to geotechnical engineering. My SI company told me that they won't take any UD for hard soil as their equipment hydraulic pressure is not high enough and their normal Shelby thin wall sampler is not suitable for hard soil. They also didn't use the cleaning...

Hi Firstly, I am not a geotechnical engineer but I have to do pile or footing design. I am new to geotechnical engineering. My first question is Usually, I will have in-situ SPT tests for my foundation design and lab tests to counter-check in-situ test results but I am not sure which one of...

Hi, How do I design this type of stair? Please share with me if you have any worked example. Thank you.

Hi Good Morning Everyone, This will be again my first bondek-slab design. Bondek supplier is not yet on board but I need to go ahead design and submit bondek design to authorities. 1. Construction stage I guess if I do my own calculation assuming it is class 4 section (i.e account for local...

Hi Everyone, It is my first-time designing stair stringer beams. My model is as shown below. I have upward reactions at the bottom supports and downward reactions at the top supports. At first, I thought that something is wrong with my model so I sent my model to the software support team. They...

Hi For a RC beam that is curved on plan subject vertical load only, 1. is the span length straight distance between two supports or curve length? 2. Is the torsion moment equal to load at the beam center times eccentricity to the straight line between two supports? Other than torsion any other...

Hi If I have a very simple steel frame with 2 steel columns and one 1 I-beam (UB) and BMD as shown below, how do I decide my beam critical length for LTB resistance at support under hogging moment? My software is using full span length but I was wondering whether it should be shorter as my...

Hi My software support team told me that they are using the above-mentioned method to do direct 2nd order analysis for building structure design. Firstly, I would like to mention that my FEM knowledge is very fundamental so I do not wise to dive into very details, derivation, calculus. I just...

Hi, it is me again. [smile] In a concrete building with shear walls, do your columns and beams take lateral loads in these cases (a) wind only (b) wind + seismic? In where I practice, I always heard people say that they let their shear-walls take all lateral loads, and columns are only designed...

Hi, Do you guys use software or spreadsheets for steel connections? Can you please recommend me a steel connection software? Thanks

Hi Do you guys do metal roof without plan bracings so called belt truss? Below picture is the model used for a software training I attended. Purlins are LTB restraint to truss. There was no problem with software analysis and design. But I am curious where do all the LTB restraint loads from...

Hi I am using 3D Tekla structural designer Software (TSD) to design buildings. I noticed that for concrete members TSD assumes cracked sections (Icr) for the analysis and by default Icr = 0.2 Ig. For uncracked sections TSD uses 0.4 Ig to account for long term effect especially creep. I think...