That soil pressures are already really high to be in the factored load combination as 1.2D + 1.6L + 1.6H?
When I was in school a decade ago we used 45 pcf for at rest pressure, now I'm seeing 65 pcf in a lot of soils reports for cohesive soils. It seems like this already has a healthy factor of...
Does anyone know if there is a rule that states you cannot slot the hole in the beam and slot the hole in the support angle or plate? Both slots would be horizontal.
I have a construction fix question and it doesn't allow time for fabricating a new connection. Welding is also difficult in this...
What is the correct Ct value from Table 12.8-2 ASCE 7-05 for a shear wall building with a flexible diaphragm? The table is valid only for rigid diaphragms according to previous SEAOC Blue Books.
The value of Ct approximates the fundamental period of a building. If Ct=0.02, then the period will...
I have a long span (120') porte coche roof truss that is triangular in cross section. There are two bottom chords, one top chord of pipes, with pipes web members tying everything together.
My question is this: does anyone have a reference for designing such a truss accounting for overall...
Here is my condition:
2 way plate pt parking structure. I have "I" shaped shear walls in the middle of the building with only 45' of slab beyond the walls on either end. My columns align with the wall where I would want to string my banded tendons thru the wall. Do I terminate the tendons at the...
I have a question about the ACI Code - 1995.
ACI 318-95 18.4.2 (c) & (d) refrences the allowable tensile fiber stress in a pre-compressed beam. (c) allows for 6 root f'c, but (d) allows for 12 root f'c if the "..analysis is based transformed cracked sections and on bilinear moment...
I have a canopy for a walkway that cantilever's up from a single column, up over the sidewalk. Because of the loads I cannot get a size the architect likes for the column. Does anyone know a way to bond concrete that is filled inside a tube in order to increase the bending moment capacity?
This is a quick one. I have a long span beam carrying brick. I can't change any of the design parameters so this is a price question:
Does anyone have a feel for the cost of a shop built truss (in cost per pound of steel) that I could compare with a plain steel beam?
I am looking at a W40x290...
Does anyone have a standard for the allowable story drift of a building subject to main wind forces? I am looking for a standard and refrences. I have used L/400 for the 10 year wind (71% of the design wind). Does this sound reasonable/too high?
Input, as always, is appreciated.
-Doug
Hello all,
Let me give you some context...
I am in the design of a two story building that is to be used as a laboratory for a fairly large university in the Midwest US. We went through 3 months of planning and design development, even a large piece of the final design. Two weeks left in the...
I have a question for structural engineers out-there familiar with connection design. I am using FEMA 350 to design a moment connection with top & bottom flange plates. One of the steps is to check block shear, including bolt pull through (Fig 3-19d pg 3-59). This would be where tension in...
Last night we had a distiguished speaker in who is a professor at a midwest U.S. engineering university who is originally from the Mideast. We had a number of design professionals around the table talking about different aspects in engineering, and the subject of fees came up. The question the...
Need some help with grouting of rock anchors. We are using 1-3/4" diameter 150 ksi Dywidag bars in a permanent application to resist uplift in a pile cap.
The commentary to section 4.3.2.6 of the 5th Edition PTI manual states that "For normal applications the bond betwen the tendon...
I am in the United States (midwest to be precise) and I am wondering if anyone knows of a graduate school that offers classes or more importantly a program in rehabilitation of historic buildings. I'm thinking of something where historic building construction is a topic, historic materials...
Does anyone have decent electronic engineering dictionary that can be imported into Microsoft Word (v9.0)? I'm sick of having to lookup words like soffit and purlin in a dictionary because word's dictionary doesn't recognize them.
Does anyone know a software where the FE's are based upon shear deformations primarily? I'm looking to design a large steel corrigated deck (22 gauge wide rib) as a steel plate and I need to have a program that is accurate for shear deformations, which control.
I am trying to model a semi-rigid diaphragm in a finite element program. I am looking for very accurate results and would like some help.
The diaphragm is a standard wide rib 1 1/2" deck. But the shear deflection calculation uses a G' for the shear modulas, which combines a lot of factors...
Does anyone in this forum know what the design return period is/should be for thermal induced loads, or deflections?
I have a problem that many of you may relate to. I am designing a large warehouse 300,000 sq. ft, that has an expansion joint in the middle. The research report that I am...
