OSHA States the following in section 1910.25(b)(6):
Each stair can support at least five times the normal anticipated live load, but never less than a concentrated load of 1,000 pounds (454 kg) applied at any point;
However, if you review the McNichols stair catalogue that follows the NAAMM...
We are using Dramix 4D fibers on a project and the contractor is having difficulty saw cutting the control joints. The specification is to saw cut within 4 hours. If they cut that early the saw blade catches the fibers and it makes a mess out of the joint. Our curing conditions are generally...
Does anyone know of any documents that give recommendations for concrete clear cover to steel that is continually exposed to high heat environments? I am designing a foundation for a kiln that will have an operating temperature of around 200 degrees Fahrenheit and I am concerned about long term...
The aluminum design manual says you can’t use aluminum blind rivets in tension? Can you use stainless steel blind rivets in tension for connecting aluminum?
I am reviewing an existing monorail crane that was built circa the 1970's. The plans indicate reactions but it is unclear if the reactions account for a vertical dynamic load allowance.
Is anyone aware of what impact factors would have been specified either ASCE or CMAA in this era?
I have a situation where a 100 year old building has a brick facade which has severely deteriorated and is imminently hazardous. I need to provide a repair plan to the city. In the interim I would like to recommend a temporary fence to restrict access. Is anyone aware of how car the fence should...
I am trying to analyze the capacity of a thin stone panel anchorage. The anchorage consists of strap anchor with a vertical leg set into a continuous saw cut kerf. Has anyone done this calculation? The limited subject matter that I have found suggest that load testing is required. Yet, I have...
I am classifying a conveyor bridge for an industrial facility. The bridge is constructed of tube steel chords and angle diagonals. The structure is classified as seismic design category D. This is a non-building structure with a weight of less than 25% of the combined weight of the bridge and...
I am reviewing calc's where a 90 foot tall tower is supporting an industrial bridge. The tower consists of 9 levels of a 12 ft x 15 ft frame with inverted chevron bracing on each side.Since it is inverted chevron bracing which is similar to a building, I believe that table 15.4-1 Ordinary...
I have a situation where we are pouring sonotube footings for a storm shelter in a location where there is a high water table. The footings will be 2.5' diamter by 4' deep. The water table is going to be near the surface. I understand that ACI 301 has some requirements but unfortunately we do...
I am investigating a rather large crack in a PT parking structure (see attached photos). It is believed that this crack has existed since the time of the post tensioning which occured approximately 30 years ago. The photo is of the east end of the crack and the crack runs west for approximately...
I need to write a specification for concrete surface repair, crack injection and for routing/sealing. Does anyone know where some generic downloadable spec's are located in the CSI format?
Does anyone know if there is a reduction in capacity for a steel girder bridge that has had the bottom flange heat straightened after a traffic collision?
I am putting together a level of effort for designing a sign bridge that will support a variable message board over a freeway. Does anyone have an estimate of what the design fees should be for this type of structure?
Currently, I am estimating there will be (8) 11x17 sheets and the design will...
Can anyone recommend a good bridge software for a typical one to three (continous) span bridge?
I have done some research and it seems like the SAP 2000 and RAM products are in the $8k to $10k price range. These programs seem to be more sophisticated then I need and a little out of my...
