AASHTO LRFD 7th Edition
Hello, community,
I’m taking the SE exam in two weeks and got paranoid a few days ago about the AASHTO book edition. I have the 6th edition and it was sufficient for winging it on the PE structure. However, I’ve been reading that the SE am section has…
LARS - LLDFs Causing Irregular Truck Positions & Moments
Hello,
I have a 73.5' simple span, rolled beam LARS V6.00.01.08 analysis that has varying LLDFs due to varying overhang widths at the supports. Using LRFD, I have input three ranges for both moment and shear.
When looking at the output tables and…
LRFR Capacity of Braced, Compact, Non-Composite Section
Member B02 in the attached file is a rolled steel floorbeam (W21x182) which qualifies as a braced, compact section. It is non-composite (no concrete deck). LARS uses the elastic moment capacity (Fy)(Sx) = 50 ksi x 417 in3 / 12 = 1737.5 k-ft to compute…
LARS - LRFD Live Load Distribution Factors for SS beams with a Non-composite Concrete Deck
I am modeling simple-span steel beams with a non-composite concrete deck. What formulas should I be using to calculate the LRFD distribution factors? I note that when I let LARS calculate the factors, the factors calculated when I model it as CSC are…
RE: Solid Wall Pier
Hi,
I'm also trying to model a solid wall pier using LEAP RC-Pier V12.01.00.57. This version has the 'Wall Pier' option, however the generated wall design is coming up with rather impractical reinforcement layouts (#18 @ 12") oriented parallel to the…
Solid Wall Pier
What is the best way to model a solid wall pier using RC Pier?
I am thinking there are two possibilities:
1) Model short cap (1' height or less) and one column (non-tapered in x and z direction) centered on footing
2) Model short cap (1' height…
Auto-generation of wind load on structure (WS) per FDOT Structures Design Guidelines (SDG) 2013
One of the new features added to the latest RC-PIER is the comprehensive auto-generation of WS loads and load combinations per the FDOT SDG 2013:
An option for WS load auto-generation is now offered under the “Loads” tab.
FDOT strength and service…
Re: COnbox: Side-by-side option
The side-by-side option in CONBOX allows you to apply the provisions of LRFD Art. 4.6.2.2.5 Special Loads with Other Traffic.
SBS: Side-by-Side live load responses use the following equations:
· LLRsp = LLRsp(PermitLL) * DF1/Z + LLRsp(DesignLL…
RC Pier Column Design
I cannot match the values that RC Pier generates for the column's moment magnification calculation for the Bd value (Ratio of Perm. Moment/Total Moment from AASHTO LRFD eqn 5.7.4.3-2). I have tried the minimum eccentricity from the AASHTO LFD code. I…
RC-Pier: Best way to input vertical wind loads on pier.
I'm trying to apply vertical wind loads on a pier per AASHTO LRFD 3.8.2. The problem I have is with the load combination generation. This load shoud only be applied during Strength III and Service IV limit states. Is there a way to specify this for the…