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...
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?
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?
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...
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...
Hello:
I have an existing steel truss that I am analyzing. The webs and chords comprise of round HSS. The walls of the chord are relatively thin so I would like to check the walls for punching shear. How does one go about doing that? Is there a techincal publication that would be able to...
1) On page 51 of ASCE 7-05 the figure lists the external pressure coefficients Cp for arched roofs of enclosed and partially enclosed buildings and structures, however, I could not find coefficients for arched roofs of open buildings and structures. Does ASCE 7 have any...
Can anyone refer me to a technical publication that will demonstrate the derivation of equation H1-1a in the 14 edition of the AISC manual. I'd like to know where the 8/9 value came from. Chapter H of the book discusses it some but not in enough detail.
