I'm checking anchor bolts on a flat-bottom welded steel water storage tank that has a 42' diameter, and is 106' tall. It has (8)-1.375" anchor bolts, some slightly corroded.
With the tank built in the 1950's, I'm assuming that it was only designed for wind (not seismic). The tank appears in...
Does anyone have a railroad code (maybe AREA) that would have requirements on the frost depth for a concrete cantilevered retaining wall along the railroad tracks? The site is just south of Boston, Massachusetts.
I have a client that has an existing one-story store that was originally designed for a second floor. They want to put on the second floor now, but want to keep the first floor store operational during the construction. Is there any OSHA regulations that prohibits keeping the store open below...
On a 5-story, loadbearing wall building, does the loadbearing wall qualify as a "column" or a "beam" when determining live load reduction? (I believe the equation is similar in most codes)
I'm getting testing results from grout used in pressure-grouted auger piles, and the 7-day results reflect approximately 50% of the desired 28-day requirements, but the 28-day breaks are all fine. Is this typical of grout? Concrete usually yields approximately 70% of design strength at 7 days...
I've been asked to do a preliminary design on a new 9-story building in Manhattan. The building footprint is only 4000sf. My initial tendency is to use a structural steel frame, but the client had been led to believe that a concrete frame would be cheaper and faster to build. I personally...
In reference to wind loads on parts of buildings, what exactly is considered a "component and cladding". Specifically, would you consider a non-loadbearing masonry exterior wall (or a precast concrete panel) a "component and cladding"? By strict definition, it would be yes...
If anyone has "Factory Mutual Property Loss Prevention Data Sheet" No. 1-28 in a pdf format, I would greatly appreciate it if you email a copy.
Thanks in advance,
Zulak
email: calbino@blcom.com
I have a lightweight concrete slab on composite steel floor deck in which the contractor experienced some scaling during construction. He's proposing to rough and clean the existing slab and installing a 2" lightweight concrete overlay with a bonding agent. Assuming all the members below...
I'm designing a two-level parking garage to be below grade (with approximately 3 feet of soil over the top. Since the structure is buried (i.e., part of the ground), are any seismic loads really generated?
I would appreciate any thoughts.
Zulak
If someone could fax me "factory mutual - property loss prevention data sheet 1-28" about wind loads to roof structures, I would greatly appreciate it. I did an uplift calculation using BOCA, but the specific client requires the factory mutual method. And I need to submit drawings...
I'm designing a two-story underground parking garage using precast tees, and exterior cast-in-place walls. My first thought was to design the exterior walls as restrained walls at the base, second level and the roof. But is it possible to introduce an axial load into the precast floor tees? Can...
I have a 40'x60' garage/storage space over a basement garage/storage in a barn. I realize some attention needs to be paid to resisting oils, salts and water from penetrating the slab and compromising the structural framing, as well as the space below. I've used a concrete topping on a...
I designed a structural floor slab and grade beam system founded on piles, and detailed the slab and grade beam as a monolithic pour. The contractor has asked if he could separate the pours, by pouring the grade beams first, and then coming back and doing the slab later. The top bars of the...
I designing a locker room utilizing masonry walls, and within the building is a mechanical room. The design criteria states the separator wall between the locker room and the mechanical room shall be "explosion-proof". What design pressure is sufficient for such a load case? I don't...
I have a design that consists of 3-story storage with steel frame and concrete composite deck. The size of the building requires a fire wall that separates the structure in two. I have designed the floor framing so that the adjecent steel line resides 10 feet from the masonry wall, resulting in...
Is there any published criteria for control joints on elevated concrete floor slabs on steel floor deck? If control joints are not necessary, how large of a floor area can be poured at one time, without worrying about overall shrinkage? The floor in question is 100' x 150', and is a 4"...
I'm framing out new floor openings in an existing building that is framed with open-web bar joist supporting a concrete slab on steel deck. The new openings will require me to cut the existing bar joists (thereby reducing their span). Since the span is reduced, and bar joists are simple...
