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The first part of this two-part Q&A focuses on provisions for using bundled No. 11 bars in beams and bundled No. 14 and No. 18 bars in drilled shafts. The second part discusses requirements on extending column ties into the footings and drop panels.
Available in the following language(s): Spanish
Reinforced concrete columns in older buildings may require strengthening because of loss of capacity due to corrosion of reinforcing steel or poor quality of the original construction. This article describes a method for enhancing both the axial and flexural capacity of such columns using a fiber-reinforced polymer laminate and provides examples of two retrofit options.
Available in the following language(s): Spanish
Structural thermal breaks are designed to minimize heat loss through the building envelope at connections between structural slabs and balconies, parapets, or slab edges. The article discusses thermal break systems for balcony, parapet, and post-tensioned slab installations, and it emphasizes the importance of proper planning for installations.
Available in the following language(s): Spanish
Since 1994, over 500 concrete panels on Runway 16C/34C at the Seattle-Tacoma International Airport were replaced with slabs constructed with belitic calcium sulfoaluminate cement concrete. The article discusses evaluation of these slabs after about 23 years in service, including compressive and flexural strength, chemistry of the pore solution, and concrete microstructure.
Available in the following language(s): Spanish
The article examines the assumptions in the ACI 318 Code and design approaches for shear using the results from beam tests with varying shear reinforcement designs measured with emerging sensor technologies. It describes the research campaign, presents the distributed measurements with a discussion of the key insights, and offers some takeaways for designers.
Available in the following language(s): Spanish