The only provision for open structures for Method 2 (components & cladding, h<60')in the ASCE 7 is Eq. 6-25 which appears to be valid for only wind loads acting perpendicular to the surface (walls). Figure 6-5 gives GCpi values for open (and closed and partially enclosed) buildings, but nowhere...
Hi all,
IBC (03) 1609.1.1 says that wind loads shall be determined per ASCE 7 (02) with one of the exceptions being "Wind loads determined by the provisions of Section 1609.6," which is the simplified method. Section 1609.6.1.2 gives conditions under which the simplified method can be used for...
Hi all,
I have an existing 200 ft high apartment building with a swimming pool on the roof. There are 6' high cmu columns about 7 ft on center with glass infill panels along the longintudinal length of the edge of the building, and typical 4 ft high solid concrete parapets along the length of...
Hi all,
Im reviewing a contractor's shop drawings for handrails. Structure is an existing 18 story hotel in Waikiki and all guardrails on the room balconies are being replaced. The contractor is showing use of proprietary expansion anchors that are not ICC approved for use in uncracked...
Hi everyone,
Can someone please tell me what the official difference is between a "rehabilitation" versus a "retrofit"? I searched the web for a while and couldn't find anything definitive. Is there also an legal AASHTO or FHWA definition?
Thanks in advance.
Anybody know where I can find information on Japanese reinforcing steel standards. I need to know what grade of reinforcing steel was used in 1988. I'm trying to do a load rating for a bridge that was built in 1988 with no as-built information. Couldn't find much info on Google.
Thanks in advance.
Hello all,
I am trying to determine the lateral deflection of a bridge abutment into the backfill material, where the backwall shears off. I am doing a seismic analysis on an existing 3-span concrete bridge with longitudinal girders and bearing seat type abutment. The geotech has given me soil...
I have been lured away from my current job by a local competitor firm by promises of more advancement opportunity, a better overall total compensation package, and a 40% increase in base salary! Any way I look at it, it’s a great opportunity and I’d be dumb not to take it. Should I give my...
I hope you hydraulics experts out there can help out an ignorant structural/bridge engineer. It's a super long story so I'm not gonna explain why, but I need to know how much area upstream and downstream from a bridge needs to be surveyed for a proper hydraulic analysis. Due to issues beyond my...
Project is a pier rehab for the Navy. Hundreds of columns are being repaired (chipping off spalls and delams, cleaning corroded rebars, etc.). The Navy spec calls for polymer (latex) modified concrete and epoxy-based bonding agent for the vertical column-repair application. Contractor's RFI says...
Reference 5.9.5.4.3a AASHTO LRFD 4th Ed, 2007.
When determining "prestress loss due to shrinkage of girder concrete between time of deck placement and final time", it is necessary to first calculate the value of K_df. When calculating K_df, what values do you folks out there use for "t_f" the...
Hi all,
Can any of you transportation/highway design guys/gals help me out? I need to know if there's a TL rating for a typical single w-beam metal guardrail with strongposts at 75" on center. I looked through all the AASHTO Roadside Design Guide and other references and couldn't find anything...
Aloha all,
Please excuse the simple steel question; I've been doing mostly concrete for the past 15 years. Anyway, can anyone tell me where I can find the allowable stress range for steel angles in bending in the AISC (green book or 13th Ed/ 2005) manuals. I see that depending on the unbraced...
Anyone know of a good reference that outlines the procedure for determining force effects due to wind channeling? The term "channeling effects" is used in Section 6.5.1 paragraph 2 of ASCE 7-02, but no procedure is given.
Just in case it's relevant, I'm designing a small "chapel", about...
I am told by a local sales rep that using fibers (specifically “Forta Ferro”) in roadway pavements can increase fatigue capacity of the roadway section, decrease thickness of base coarses, decrease concrete thickness, enhanced crack control etc.
Does anyone out there have experience with this...
Hi all,
I have a situation where there is an existing continuous, simply-supported 4"x12" (3.5"x11.25" field measured) wood beam. There is a column at approximately midspan. The beam is exposed (painted white to match ceiling and walls), and the owner wants the column removed because it...
