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bridgebuster: Thanks for the link. I'll check it out to see their take on the situation. Qshake: I have 2 guides from AASHTO on Temporary Bridge Works (Design Guide Specifications & Construction Handbook) but both deal primarily with temporary structures used in conjunction with constructing...

TTK: One more thing...The 1.2 DF is for shear, correct? There would be a different placement to figure moment - One wheel from each lane spaced 1/2 between adjacent beams to get a maximum moment.

TTK: I have a steel grid deck. Do you know the ratio for the S/ for steel grid? I was curious as to the comparison with 1.2. Thanks again

I've been doing small (less than 75') temporary bridge designs for contractors doing DOT bridge projects. I was wondering how in-depth most temporary bridge designs are. I tend to want to treat it as a permanent structure (performing all the LRFD checks), however in reviewing past designs, it...

TTK: Thanks for your reply. It seems I was on the right track but hadn't place the trucks properly to get the maximum DF (I was unaware of the 4' between the lanes). Unfortunately this is bad news for my design/analysis as it seems my bearing stiffeners are inadequate. bridgebuster: I was...

I am working on a temporary bridge design. Although I have done LRFD designs in the past, this is the first with 2 design lanes loaded. Since the deck is steel grid, the Distribution factors are to be determined using the lever rule. I understand how to apply this rule to the exterior...

cvg: You just backed up my concerns on this project. What I didn't mention before is that I am only analyzing a system that was 'designed' by another engineer. The system is already in place and I have been attempting to justify what has been done. Being somewhat new to this (at least in the...

Semo: Thanks for your advice and I completely agree. It seems that I just can't round up enough information to perform an adequate analysis. You see, I am dealing with a rather small municipality and I can't track down the person holding the information! Actually, my crude calculations show...

hyrae: the chart was not taken from APWA, at least not directly. The chart I refer to is in the section of our state regulations concerning water line permiting requirements.

I just started using EPAnet2 software to model a small waterline project. I am connecting to an existing 12" municipal waterline with these criteria: static pressure 52psi, residual 46 psi, flow rate of 302 gpm and an elevation of 467 feet. How do I model this source with the software? (I am...

thanks for your reply. I recently downloaded EPAnet, free software for network analysis, but haven't quite mastered the details of it yet. I had already set up a spreadsheet to run my calculations. I should clarify that I am not actually designing this system but attempting to justify another...

Correction to original post: Actually, I have been using the Darcy Equation (not Hazen Williams) to calculate the headloss due to friction. Also, I have been neglecting minor losses.

I am working on my first water line extension project. It is a small extension serving 11 homes in a subdivision of approximately 12 acres total. I have been told my local officials that I need to consider 3 cases: 1)static or low flow must have 30 psi at each meter 2) average daily demand...