Trying to find guidance for screws fixed to end grain of a member. Do standard bolt/screw spacing apply for fasteners installed at the cross-section of timber/beam joist? loads perpendicular to grain require an edge distance of 5 x bolt diameter, which cannot be achieved if the fastener is...
Hi All, I started a thread last year about shear stud design for composite steel beams (thread507-485849). It didn't get a lot of response and wish to revisit it.
Based on engineering principles when two or more sections are joined together to act as one, the connection joining the sections...
Anyone have lots of expierence with un-reinforced concrete stumps? Inspected a house that have a cracked internal concrete stumps (100mm x 100mm) height of stump is no more than 1m. Loads are relatively small that an equivalent 100x100 hardwood post would work.
To engineers who have are very knowledgeable in welding please help.
Have a few questions about steel welding - building structures (tried browsing the forum but cant find the answers).
1. Most standards tell you that minimum size of fillet weld is 3mm - why is this?
2. If you are to use the...
I notice that the calculated elastic deflection at tip of propped cantilever beam is dependent on backspan. Deflection increases as backspan length go up.
deflection at tip of pure cantilever: PL^3/3EI
Deflection at tip of propped cantilever: P(Lc)^2/3EI x (Lb+Lc)
For example I have a 10kN...
Connection between built-up steel members is usually taken from shear flow calculation (VQ/I), calculate the stress and check if weld thickness is adequate.
However, the connection between a steel beam and concrete slab (composite action) via a shear stud is calculated differently - by taking...
I'm currently accessing AS/NZ standards through Concrete Institute of Australia, subscription price is reasonable, however, the new platform i2i is not that great. You cannot open a downloaded standard without internet connection and you can only open the pdf using adobe (this is a recent...
Hi guys and gals, do you think that the current level of our fees is where it should be? In my experience, structural + civil fee is usually no more than 2% of the total construction cost.
I've seen numerous debates about how real estate agents get 5% commission for what seems to be less...
Is there anyone here who can explain why the column moment magnification formula of BS 8110 vs ACI 318 is so different? And somehow BS 8110 makes more sense particularly if you design the column as pin-pin (lateral stability by shear walls). Any help would be appreciated.
Here is a link...
The typical detail for a concrete slab bearing on clay brick wall involves a slip joint to accommodate horizontal movement (due to brick growth/ concrete shrinkage). I understand this, however, how do you transfer earthquake/wind forces to the brick wall? How do you comply with robustness (1.5%...
Hi guys two part question:
1. does anyone know a good resource for simplified calculations for non-linear geometric analysis?
2. Is the second-order effect (P-big delta) moment for a cantilever column with a vertical point load at the tip and is subject to lateral load equal to vertical load...
Found this video on the internet showing a cantilevered system without a counterweight. I don't think it is real!
https://bilimkocu.com/?p=1952
also on youtube: https://youtu.be/CsmjjOMQg34
Let me know your thoughts....
It's quite common to consider timber stud walls as a non-load bearing structure for steel frame construction. Normally, internal timber stud walls have slotted connections on top (to avoid load transfer). However, I haven't seen one for external non-load bearing stud walls (running directly...
There seems to be a variety of opinions on whether structural engineering firms should include PT design on their documentation or leave it to specialist. Most structural engineers have a good understanding of PT (noting that some heavily rely on software such as RAPT) but not to the same extent...
I understand that the joint on a concrete wall and PT slab/beam should allow for horizontal movement during the stressing of the tendons. I haven't seen this done in columns. Are columns flexible enough to neglect their potential to restraint the slab/beam from movement during stressing? or have...
Hi guys, I've previously worked for a medium sized firm where we had the luxury of jobs come to us, in-fact the biggest issue I had then was having too many project but so little staff. I haven't really experienced how to chase after new projects. However, I lost all that when I moved on to very...
Hi all, would like to ask a pretty basic questions about the retaining wall joints. There are three joints used in concrete retaining wall construction 1. Construction joint 2. Expansion Joint 3. Contraction joint.
Now, I know that construction joint is formed when casting of a wall cannot be...
I was wondering, why is the T-beam effective width a function of the span length? or to be more precise for relevant codes a function of the points of contraflexure for sagging bending moments.
Hope someone could help
For wind loads and notional loads, can a staircase and/or brick wall infill (assuming non-structural) be considered as a lateral bracing. If so, how do we check in adequacy of these elements against such loads? I have one document that assumed that these elements were to brace the building...
