I am designing falsework to support a RR bridge span. Deadload only. the span is 121' and I want to allow for thermal expansion with using 3/8" steel rods under one girder end. This is temporary, about 2 months. grease wont work, the coef. of friction (observed from previous work) is about...
Hello, I am designing an underhung crane that we will use on a bridge project. the runway beams will be attached to the floorbeams that run transverse to the roadway with Lindaptor Clamps. I am using CMAA 74, AISC dg 7, AISE rpt 13, and a few others along with osha. my question is combining...
hello all,
I am designing a jacking system to exchange out bridge bearings for an IDOT (Illinois DOT) bridge built in 1961. While looking at the drawings of the existing structure, the steel called out for is:
A.S. steel and W.S. steel.
Does anyone know what the yield and ultimate...
i am taking a preliminary look at a stanchion and horizontal lifeline system for fall protection on a project our company has. looking through the osha regs there is mentioned in 2 different test weights, 220lbs and 300lbs. i am wondering which weight applies to what circumstance.
thanks...
i am designing a drill casing pulling lug. the lug will never see the loads it is designed for but i want to have a complete design i can stamp and file away.
Question: how do you determine the shear stress that is used in the formula (3-37) that determines fcr? the most conservative way...
Hi Guys, i am cleaning up some old files and am checking on the capacity of metal mesh used as a walk surface on our (old) work platforms. the spans are 4'x8' with the mesh welded every third intersection to the perimiter (lap weld) the capacity i am looking for is around 22psf x 4F.S. =88psf...
i am designing a scaffold that is suspended by cables. we are planning on using specific lgt cable chokers with thimbles as required per osha but i am wondering if the "fist grip" clamps can be used instead, to make enable the height adjustment to be easier. at first i was thinking they were...
i am designing the cable support system for a work platform that we fabricated years ago. we have updated the platform to the DL + 4LL as required by OSHA. during my review of OSHA subpart L - scaffolds, under General Requirements (a) (3) it states " Each suspension rope, including...
i have design bridge jacking and supporting falsework and concrete forming for the company i work for and i have a project where we have to jack and replace some bridge bearings. i will definetly need bearing stiffeners over the rams. according to aisc 9th if you provide stiffeners halfway up...
i am designing a pick beam we own that i can stamp and file per osha regs. i am using the asme bth-1 2005 spec which mirrors the aisc asd spec except with addditional safety factors. but my question is how do you determine what the L length of the beam is? (we are using 20' btw) but the ends...
hi am new to this forum just found it today. i am designing the steel erection procedure to set beams with 1 quarter-point splice. the span is 150' long, simple span. we will use 2 cranes to set the 110' pc and the 40' pc. then use a 3rd crane to 'hold' about midspan with about 12000lbs of...
