More than half of local structural engineers I know doesn't use manual computations anymore. They reason it's long process to get for example the biaxial interaction diagram, moments of each columns and beams and their interactions especially if they are designing very tall stories. So they rely...
When the shear beam span to depth ratio is less than 2.5. It's supposed to be deep beams. Yet we still use stirrups in above column deep beams (RC). Okay. This is what perflexed me. In combined footings and even normal isolated spread footings. We don't use stirrups because we can increase the...
Today I was discussing with the contractor engineers of how to support the top bars (longitudinal) in the combined footings like shown above. They haven't encountered anything like it in their years of constructions. This is because in normal footings.. only the bottom bars exist. Now for the...
What's the usual length of beam span you work with? In my place I know many engineers who only work with 4 meter or less beam span. In such short span, the moments (Mu) at supports is only roughly 40kN.m and they have confidence only working with this. When beam span reaches 6 meter. The...
what is the roof load kpa of roof antenna like this?
my client wants his roof to be able to take these possible antennas in the future. What is the biggest loads you have encountered?
Btw.. anyone knows what kinds of antennas are those? Why is it vertical? I know round shapes are microwave...
The above is very typical in our plans. Where there is any column at edge, it comes hand in hand with column at corner of footing (see right lower picture above).
For column at edge (beyond the kern) of footing but not at corner, the formula to get qmax is:
qmax = 2P/(3bm)
b comes from...
How much maximum percentage of steel do you use in columns? It is said when it goes above 3%. One must use mechanical splice coupler.. any experience with this? Have you designed percentage of column steel that goes 4% and just using ordinary splicing at mid point of column?
Say, are the bar connections between column and isolated spread footing identical to the bar connections between column and combined footings?
Please share your connections or sites or any papers showing exactly how the column bars is connected to the footings. There seems to be many...
It is said that bigger columns attract greater earthquake forces. Imagine a column that is size 0.3x0.3 mtr versus one size 0.6x0.6 meter and 3 meters height each. The earthquake would produce the same displacement and the 0.6x0.6 meter column would be stiff hence attract greater seismic forces...
How many have worked or experienced on designing structural for bank vault (or similar)? How heavy is the entire setup (for say 2 meter by 1.5 meter room and 8 feet high)? any reference or web site that details this? I need to know how the slabs are reinforced to support bank vault and whether...
In our office, colleagues often use load reduction to design footings with the columns directly on the exterior portion of the lot (zero clearance) to avoid oversize footings. This often results in underdesigned exterior footings. Now I need to design one that needs to use the full commercial...
