I am assisting an industrial client reviewing cracking distress in an 8-inch thick elevated slab. Visual petrography suggests that there is evidence of external sulfate attack limited to crack surfaces, likely a result of the chemicals to which the slab is exposed. The slab is reinforced with...
I have been tasked with enlarging existing roll-up door openings and am in a very preliminary phase of the design. The current 7 1/4" thick panels are approximately 28' wide by 25' high and currently contain two 10' wide by 10' high doors. The client needs to enlarge these doors to 12' wide by...
I was recently on a project observing test cuts in a strand-wound shotcrete tank structure (~50 yrs old) with an embedded steel diaphragm. The diaphragm is severely corroded at the vertical diaphragm joints adjacent to what was reported to be polysulfide sealant. The corrosion decreases with...
Does anyone have any resources or recommendations for material to use in guardrail post pockets? We are working on concrete balcony repairs. The aluminum rail posts were originally embedded. I am considering blocking out pockets at the rail bases in the repair areas and filling the pockets...
I am a structural engineer assisting a client in determining the cause of a shaft failure. We normally strain gage components, but this is an inaccessible rotating shaft. I can analyze the shaft and key, but need to determine the shaft torque. I have limited motor info so far (25 HP...
Not being a design engineer, I have a question on standard terminology. I know how to evaluate and use live load reductions; however, we have been asked to interpret drawings that indicate the design live load is "80 psf Reduced". How can this be stated for the entire floor when various...
I recently performed a general evaluation of a large concrete parking lot (xp joints at 40' 1-way, control joints at 20' e.w.)to determine the cause of cracking/ spalling near expansion joints.
An ~2 sq.ft. collapsed section near (~20') the lot's earth drainage swale revealed an approximate...
