I've got a project where the client is asking me to come up with a lifting capacity of an existing bridge crane. I have the existing structural drawings and I know the runway beam and cap channel sizes and the crane rail, but for reasons I can't get into, I do not have any other information...
I've got a unique sloped bottom chord truss being supported by steel channels (see attached). The bottom chords are 2x6 and the channels are C6x8.2 and the connections cannot involve field welding. Any ideas on the connection? I can't use a birdsmouth at the truss bearing because it leaves me...
Does anyone have any references for design of reinforced concrete arches? They aren't arch bridges, just some relatively shorter span (<15 ft) concrete arches spanning over storefront and picking up some CMU above. Thanks.
How do other engineers handle stud alignment with floor trusses/joists in 3-5 story wood buildings? Since most of my wood buildings use floor trusses and the truss manufacturers typically use 2x4 ribbon boards, I usually spec that the studs must align with trusses and so forth throughout the...
I've got a retaining wall in a basement on a house and I'm trying to use the floor to restrain the top of the wall so I don't have to design it as cantilevered. I'm having a problem coming up with a detail that I feel good about. I need like 1100 lb/ft (strength level) restraint at the top of...
Does anyone have any experience modeling concrete domes with ring beams in RISA3D? I'm having a hard time getting the tension force in the ring beam to match the theoretical force based on shell theory. The meridinal forces are reasonably close (within 0.5%) of the theoretical, but my tension...
The dome provisions for component and cladding pressures only apply to circular domes since that's what the testing was done on when they developed the external pressure coefficients. Is it okay to use the circular dome pressure coefficients for an ellipsoidal dome (prolate ellipsoid) as long...
I recently designed a retaining wall that had a CMU screen wall above it for IBC 2012. I had #5's at 24 inches in the CMU and #5's at 12 inches centered in the stem of the retaining wall, so I extended alternating bars from the stem to lap splice the CMU vertical reinforcement. When I detailed...
I'm designing a fairly large, 4 story wood apartment building on two-way, PT podium slab. The building is large enough that we are putting in an expansion joint to separate the main building from a small "leg" on the southwest corner. The main building is a large rectangle with a courtyard in...
I know this has been brought up on here before, but I couldn't really find a consensus. If the orthogonal load combinations are required for seismic design, are they also used for seismic drift computation as well? Thanks in advance.
