Take a look at the attached sketch and tell me what you think the unbraced length should be as I evaluate the allowable stress on the section.
I am designing a C shaped lifter to replace one with very poor weld details, pipe sections welded with partial pen welds in a 90 degree knee joint at...
Hello All,
See attached photos of metal joist/rafters, vintage is 1942 or earlier, they appear when you look very close to be cast iron. 24ft span, supporting roof. "T" shaped top and bottom chords with bar shaped web lacing. There are no welds visible at the intersections of the the web...
I am designing an access road and stormwater system for a small residential development. The access road goes up at an 8% slope and I would like to make an effort to minimize the accumulation of stormwater to the cut side ditch and also encourage the sheet flow to an adjacent gently sloped...
I am designing a foundation in a flood hazard area for which FEMA recommends back-filled stem walls as a resilient type of system for this application. See attached sketch from FEMA Technical Bulletin 1. I have planned a 7+ft tall reinforced concrete wall capped with a slab as shown on the...
I am designing a small bridge abutment for a single span, single lane cast-in-place slab bridge. The factored vertical load on top of the abutment and the factored moment at the stem of the abutment wall are shown on the attached sketch. In the final reinforcement design I need clarification...
I want to calculate the stress in the bottom flange of a beam that supports a trolley and hoist. I have already checked the overall beam for bending, shear and bottom flange bending per CMAA #74. The problem is that there is an existing group of bolt holes immediately adjacent to where the...
I have a very specific check I want to make where the wheel from a hoist trolly is located adjacent to an existing bolt hole. A two ton hoist is attached to a trollye which rolls on a S6X12.5 beam and passes by an old bolt pattern of 4 @ 9/16" holes. I want to evaluate/model the stresses at...
I am designing the tension reinforcement within the stem of a cantilever retaining wall. This wall, like most walls, is tall enough that it would be very inconvenient to require that the bars be placed full height at the time of the footing pour. I would like to provide a lap splice of the...
Most books out there seem to be about water supply network modeling, water treatment, etc. I need drawings, sketches and specificiations which show how water supply distribution systems, 12" and smaller, should be constructed. For example, ductile iron pipe bedding requirements, individual...
