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Thanks!

Anyone know a reference to masonry allowable stress values/formulas for an unreinforced masonry arch (I have the f'm values for the brick and mortar from the ASTMs)? The allowable values given by ACI 530 Section 2.2 do not seem to apply for an arch (h/r ratio refers to the height of a column or...

Thanks. Have any leads on information on penetrations in one way cast slabs (with beam supports)?

I recently read somewhere (don't remember where) a suggested max concrete core diameter in relation to the deck thickness. Has anyone seen this recommendation? Does anyone know a publication which addresses the performance of concrete deck slabs with varying size full depth penetrations (with...

AASHTO Condition Evaluation Manual has wrought iron allowable (in tension and bending) as 14.6ksi (inventory) and 20ksi (operating). Don't know the ASTM. Consider taking some coupons though to verify.

I have an historic bridge where select rivets are to be replaced with high strength bolts. New bolt heads are required to have the appearance of the existing rivets (on both ends of the bolt). Anyone have any experience with this kind of bolt? Does it exist? Thanks.

I have a post tensioned (unbonded 7 wire strand) garage slab. Some PT anchors have been exposed in areas of concrete repair (i.e. at construction joints and at slab edges). All rebar in each concrete patch is getting coated with zinc paint. I heard from a contractor years ago that PT anchors...

Designing the reinforcement for a retaining wall attached to a bridge abutment. For the stem, I've calculated the active lateral earth pressure and the seismic lateral earth pressure (using monobe-okobe). In addition, if I consider the mass x accel of soil on heel and abutment stem DL, the...

It's a steel arch - single span bridge. Don't know the designer.

I'm working on the reconstruction of an historical bridge that was built in the late 1800's (two lane roadway). I'm curious about the live load that might have been used for design at the time it was built? Thanks.

thanks for the info.

Have a single span bridge with a cantilever type abutment about 30' height. I used the Mononobe Okobe method to get the Seismic active earth pressure coefficient on the cantilever type abutment. How do I incorporate the inertial force of the abutment concrete as an overturning moment in a...

Dealing with an historical bridge where I’m reusing the steel arch girders (6 of them) and rebuilding the rest of the bridge entirely. The steel arch girder will be attached to the stem via concrete corbel. I’m wondering if there is a typical type of abutment that is used for this situation...