List of Contributions

Post Tension Institute (PTI) specifies both bonded and unbonded as does ACI 423 in their current guides. A bonded tendon still transfers force from the grout to the duct to the concrete, whereas an unbonded tendon that is damaged is completely lost. ------------------------------ Martin Fradua P.E., ...

AISC 360 J5 states, "in welded construction, any filler 1/4 in. or more in thickness shall extend beyond the edges of the splice plate and shall be welded to the part on which it is fitted with sufficient weld to transmit the splice plate load....." For bolts through fillers adding up to 3/4 inch there ...

Exposed ​roof membranes need walkway pads for access to equipment areas to avoid damage from foot traffic and tool boxes etc. Pavers over the roof membrane can support small planters. Pavers on pedestals have point loads that should be taken into account from a load compression capacity. Placing planters ...

Daniel, at the end of a group of SJI joists you may find a metal tag identifying the joist manufacturer with a code number for you to contact the manufacturer through a form sent to SJI. The joists you are involved with may or may not be SJI, but they still may have a metal joist tag identifying them. ...

You should post a photo or sketch of this 150 year old building to get more meaningful response. I assume your building is box shaped. For your information in NYC buildings in the early 1900's did not require wind loading for building less than 100 foot high. this is in part due to the mass of the old ...