I need to back fill a 50’x50’x12’ (deep) pit and build a pre-engineering building. The max load from each column (Total of 8) is 50 kip. I specify the select structure fill as backfill material. Backfill are required to be compacted (95%)every 8”. However, I am still afraid that this thick...
I need to design a concrete retaining wall. In the design, the seismic load has to be considered. I did design a dam which considered seismic load from water behind but I have never designed such a retaining wall which seismic load from earth behind need to be considered. I use similar idea to...
I need to design a steel dunnage support for a HVAC unit. Four supporting posts will be sat on four existing building columns which located at both sides of an expansion joint. (2 columns on one side of the joint and the other 2 columns on the other side of the joint).
I am afraid of either...
I just got an AISC 13th edition manual. Comparing table III Framed beam connection in AISC 9Th (P4-26) and table 10-2 Bolted dbl angle connection in 13th edition (P10-46). It gives such a big different result for the same connection. I can not figure out why. Is there anybody can help me?
For...
I used to use 9th edition AISC manual of steel construction. A few days ago, our office just bought a 13th edition. I went over it a few times. It seems to me that 9th is much handier. Most importantly, 9th edition give many examples which explain manual very well. While the new one (new to me)...
I am designing a shear connection for steel beams. One beam is coped. Is it required by any code to check web buckling for all coped beams? Is it necessary? I could not find any example in AISC manual. Any quick way to do that? Please help.
Question,
I am designing a residential house and owner wanted a high ceiling study room. Study room is 16’ long x 16’ wide. Collar beams (connecting both side of rafters) are supposed to be located at 2/3 roof high. How do I considerer the lateral load due to raise of collar beam? Can the...
We have a four floor parking garage with concrete waffle slab (pan size: 5’x5’x 3’ (high)) supported by concrete columns (30’x30’). There are many diagonal vertical cracks are noticed in the waffle beam near the top of column at the second floor only. Is there any body here happens to have...
I am designing a concrete footing for a steel framing building. The footing cannot resist any moment. I therefore use a pin support. I could not find a pin connection detail from my textbooks or steel manual. The only detail I found is to use 4 bolts at each corner of base plate . Can this...
I am designing a 2-story building (30’x60’x16’(h)) with big windows at all sides. Building has to stand for a heavy wind load and there is no any shear wall can be constructed for the layout. I therefore chose the following system:
Framing: made of steel beam and post
Roof and floor: made of...
I am designing a steel beam to support a floor system which is made of 18” deep timber joists and plywood floor. Joists are hung on the top flange of the steel beam with 12” space(30' span ). My question is:
Can I consider this steel beam as fully lateral supported? Does any one know a book...
I am designing an independent concrete footing which is set on rock. The moment from column is 250 kip-feet and vertical load is 100 kip. I try to dowel rebar into the rock to resistant the moment in order to make the footing as small as possible. I assume that I can design it in the same way as...
I am designing a steel frame. Its footing should be set on a big rock. I try to dowel rebars into the rock and grout them with epoxy to resistant the moment from the frame. In order to make sure the rock is strong enough to anchor the rebar, I would like to do some tests after rebars have been...
I need to design a timber shed (50’x 40’x15’(h)) located on the top of a mountain. The mountain is 600’ high from ground. Basic wind speed for this area is 120 m/hr. The uplift pressure therefore could come to 85#/sf. Is any one familiar with this situation and can give me suggestions as for...
