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Seismic Performance of Strengthened Slab-Column Connections in a Full-Scale Test
Strengthening of flat slab – column connections to resist imposed lateral drifts is often required for older reinforced concrete structures in which the flat slab systems were typically designed to resist gravity loads only. The complex stress state around the columns means that strong experimental evidence is required for the repair and strengthening techniques to be adopted with confidence in practice. Although a significant amount of research has been devoted to strengthening of slab – column connections, a series of limitations still remain. A thorough literature review revealed that only relatively thin and isolated specimens have been tested under seismic-type loading under realistic strengthening scenarios. To overcome these limitations, a full scale two-story flat slab building specimen was tested at the European Commission’s Joint Research Centre - ELSA Laboratory in Ispra, Italy. The test was conducted in a series of phases. This paper describes and analyzes the results obtained by a test on repaired and strengthened interior and exterior slab – column connections. One interior and two edge connections of the first floor were strengthened using post-installed bolts around the column, allowing a direct comparison with un-strengthened connections in symmetric locations in the building. Compared to previous tests, the full-scale building specimen has a thicker slab (200 mm), realistic slab continuity conditions and the connections were strengthened after they suffered damage from gravity loading and previous lateral loading phases. The results show that post-installed bolts are efficient even under the described conditions (i.e. damaged and repaired specimens with realistic thickness), and punching shear failure was avoided in the strengthened connections. The interior un-strengthened connection started degrading rapidly after the 3.0% drift cycle, whereas the strengthened connection showed no signs of degradation or imminent failure until the end of the test, at 6% story drift ratio. ; JRC.E.3 - Safety ...
Seismic Performance of Strengthened Slab-Column Connections in a Full-Scale Test
Strengthening of flat slab – column connections to resist imposed lateral drifts is often required for older reinforced concrete structures in which the flat slab systems were typically designed to resist gravity loads only. The complex stress state around the columns means that strong experimental evidence is required for the repair and strengthening techniques to be adopted with confidence in practice. Although a significant amount of research has been devoted to strengthening of slab – column connections, a series of limitations still remain. A thorough literature review revealed that only relatively thin and isolated specimens have been tested under seismic-type loading under realistic strengthening scenarios. To overcome these limitations, a full scale two-story flat slab building specimen was tested at the European Commission’s Joint Research Centre - ELSA Laboratory in Ispra, Italy. The test was conducted in a series of phases. This paper describes and analyzes the results obtained by a test on repaired and strengthened interior and exterior slab – column connections. One interior and two edge connections of the first floor were strengthened using post-installed bolts around the column, allowing a direct comparison with un-strengthened connections in symmetric locations in the building. Compared to previous tests, the full-scale building specimen has a thicker slab (200 mm), realistic slab continuity conditions and the connections were strengthened after they suffered damage from gravity loading and previous lateral loading phases. The results show that post-installed bolts are efficient even under the described conditions (i.e. damaged and repaired specimens with realistic thickness), and punching shear failure was avoided in the strengthened connections. The interior un-strengthened connection started degrading rapidly after the 3.0% drift cycle, whereas the strengthened connection showed no signs of degradation or imminent failure until the end of the test, at 6% story drift ratio. ; JRC.E.3 - Safety ...
Seismic Performance of Strengthened Slab-Column Connections in a Full-Scale Test
PINHO RAMOS Antonio (author) / ISUFI Brisid (author) / MARREIROS Rui (author) / CORONELLI Dario (author) / NETTI Teresa (author) / LAMPERTI TORNAGHI Marco (author) / TSIONIS Georgios (author) / MUTTONI Aurelio (author)
2023-01-01
Miscellaneous
Electronic Resource
English
DDC:
690
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