In this thread thread507-84756 "SlideRuleEra" suggested that we compare the failure load of harness parts (5,000 lb) to one measure of the failure load of the steel member (the load at 36 ksi yield strength) and "haggis" came up with C4x5.4 spanning 9 ft. Is this correct approach? For 9 ft span...
I am doing ASCE 7-05 seismic calculations of cooling tower support steel structure (see attachment) and I am not sure what seismic force-resisting system it is. Ordinary steel concentrically braced frame (R=3.25) or Special steel concentrically braced frame (R=6) or Steel system not specifically...
Our mechanical engineer is asking me to check circular plate made of quartz. Plate is about 14” dia and 2” thick with a lot (about 150) holes 3/16” dia. All quartz properties (E, yield, allowable tensile stress, …) were given. I am considering modeling this plate with triangular plate elements...
Should wind load on purlins HSS10x4 welded to main roof trusses (see attachment) be calculated using factors for MWFRS or C&C? I thought for purlins, in this case since they are part of main wind force resisting system, should MWFRS factors used. In what part of ASCE 7 is this? Thanks IV
I have designed canopy spread footing using load combination 0.6D+W and 1.0 factor of safety for overturning and uplift but reviewer wants me to use FOS=1.5 It looks very conservative to me and I could not find this in IBC. However PIP STC01015 Structural Design Criteria Section 4.3.7.2 is very...
Catalogs for adhesive or mechanical anchor bolts usually give allowable and ultimate loads and their ratio is around 1:4. However ratio between nominal loads (using allowable stress design) and factored loads (using strength design) is less than 1:2. This means allowable stress design gives you...
I have just noticed difference in wall design thicknesses (as well as section properties) for Pipes and Tubes between 9th and 13th Manual. Anybody knows why? Thanks
Any guidelines/formulas/references how to calculate pretension load for guy wire supported flare stack. Is it percentage of the cable breaking strength? Thank you very much.
Here is a link for example of eccentrically loaded spread footing with two design approaches I have seen
and I am just wandering which one is correct.
http://www.mooload.com/new/file.php?file=files/211106/1164137438/Spread+Footing.pdf
Thanks,
IV
Anybody used Insulated Concrete Form (ICF) for 4-5 story condos and wants to share design/construction experiences would be greatly appreciated.
Thanks,
IV
For 50ft x 25ft x 18in thick concrete mat with 5ft height x 10in thick wall all around (tank spill containment area) is expansion joint required?
Thanks,
Table 4-12 (AISC Manual 13th) shows available axial strength for eccentrically loaded single angles.
For example: L4x4x1/4, Grade 36, KL=5ft, Pmax=13.4kips
while Table from Eng. Journal, Second Quarter 1991
(by Wayne Walker) shows Pmax=9.6 kips
Anybody knows why?
Thanks,
I am looking for bending moment tables for edge-supported (all possible boundary conditions/combinations - free edge, simple supported of fixed edge) rectangular plate under concentrated load (or distributed load under small tributary area) at any point of the plate. Roark’s book has only...
I have received a special offer ($120.00 and free S&H) from McGraw-Hill for Foundation Engineering Handbook (Design and Construction with 2006 IBC) by Robert W. Day. I'll be very grateful for any comments from anyone who bought and used it.
Regards,
Cdi12
