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What does it mean when a steel bearing plate for a Bridge is tap bolted to the bottom flange or a girder? Is there an illustration out there?

Is their a go by calculation that demonstrates the determination of lateral surchared from a Cooper E80 load and how it reduces in magnitude with depth. I believe the surcharge is determined by taking the axle load of 80kips and dividing by the product of tie length and axle spacing. However how...

Thank you

Are there limitations to the depth that a concrete drilled shaft can be? Is it unheard of to have 100 foot long drilled piers?

Thank you everyone for your posts. It has been helpful.

Looking for some history to the development of reinforced concrete design. For example, where did "jd" come from. How was it determined that "d" needed to be multiplied by "j" which is some fraction of the effective depth. Why was the letter "j" chosen? Are there any good publications out there...

Hello everyone. I'm analyzing a one way slab for a 1950s era office building. The floor system was made of up asphalt tile and a 4 inch rubber tile. Anybody have any idea how much this 4 inch rubber tile would weigh in PSF?

Hello, Are there any design examples of an approach slab for a railroad bridge out there? SEG

Is it acceptable to use the ACI 318 code in conjunction with AASHTO when designing concrete bridge components? If allowed, where in AASHTO does it allow full use of ACI 318?

I absolutely agree with you JAE.....how does one clearly identify to someone what 125 psf vs some other value. I like how they do it with steel racks, they just say X lbs per shelve....this in my opinion is easier for others to understand. SRE - Thanks again for your input. Sorry it's taking...

Hello all. Great responses. I haven't had a chance to jump back on this....this is a back burner project for me. Working on it whenever I have time. I will run numbers soon and post so SRE can compare with my numbers....shouldn't take to long...I'm also interested to see what we both came up...

I strongly believe it is someone's concotion. I have never seen anything like this either. I reached out to RedBuilt whose technical representative said he had not seen something like this before. I've reached out to Louisiana Pacific and am waiting a response. The only stamps I could see where...

Trying to determine the capacity of some wood i-joist. I have attached a sketch and some photos. The cross-section does not match any wood i-joists from any manufacturer's catalogs. Ultimately trying to post a sign that will indicate the maximum live load. Any ideas? I've never seen 2x4's...

Thanks for the information.

Does anyone know where I can find a design example that shows the analysis process when using a fiber wrap on a concrete beam repair?

Thanks again.

Thanks. It makes sense to me to treat it as a single unit, not sure why they only consider the beam only in a composite section versus using the entire section (beam and slab).

In the 2012 AASHTO LRFD Bridge Design manual on page 4-32 there are several variables required to solve for the longitudinal stiffness factor (Kg). Two of those parameters are A and I. Just underneath the formula for Kg there is a note that says the following, "The parameters A and I shall be...

Figure 6-10 on page 51 of ASCE 7-05 identifies the Cp value to use for arched roofs. How would you define "Windward Quarter and Center Half" for an arched roof. ASCE 7-05 does not provide any information regarding this. I have attached two options which show two different interpretations. Any...

Basic Question: What R-Value is equivalent to 25 F*h*square feet/BTU? Would R-25 be equivalent to this?