Here is a drawing of the lifter that was designed and fabricated, with a counterweight, that is just too heavy....http://files.engineering.com/getfile.aspx?folder=de41eabb-5050-4ad6-bf1d-57440aaed7a7&file=C_SHAPED_LIFTER_partial_view_of_plan_for_sharing.pdf
Thank you all.
I would like comments on your thoughts regarding the Lb, unbraced length, that you think would apply.
cal91, The reason I would like input on this is because during the analysis for shapes, other than closed or sections in weak axis bending for example, the Lb is really...
See attached photo of an example unit. The geometric constraint is the unit needs to fit inside a 2.375" diameter hole, with the long end buried all the way up to the handle. The unit lifts rolls of paper, so the long part slides into the center of the rolls. You can see in the photo the...
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...
JAE - You hit it spot on with the identification of the member and helpful guidance to the reference resources I will need for determining member details and capacity. The KalmanTruss open web steel joist on page 387 of the Carnegie reference was an as-built match. You are all correct...
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...
Thank you all for your input.
Debaser, thanks for the improved curbing product idea to consider.
ACtrafficengr, thank you for sharing your experience. I would like to include a grass lined swale between pavement and sidewalk, as you suggest. Potentially a nice improvement. Soil is well...
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...
Hello Bridgebuster and Qshake,
Thank you for your input would you please follow up if you have a chance. The design is intended to be cantilever abutment wall on a spread footing. My sketch does not show all of the reinforcement or any of the connection details to the superstructure. For...
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...
Thank you all for your input.
StrykerTECH, the load on the trolley is 4.3K, which translates to 1.08K per wheel passing by the holes. The allowable stress is .66fy or 23.8ksi. The beam span is 63".
There are two reasons why I want to know the stresses, even though it has been operating for...
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...
