Document Type

Data Set

Publication Date

Winter 2024

Abstract

Conventional reinforced concrete transportation structures in North America often use Grade 40 ksi-60 ksi reinforcing steel. The introduction of high strength reinforcing steel (HSRS) with higher yield strength in the reinforced concrete industry has led to many economic and workability advantages such as construction time saving, reduced labor cost and steel consumption which in turn alleviates congestion of reinforcement, savings in transportation and deliveries that finally results in lower carbon emission. Despite these benefits, many states, including those in Region 6, have not widely adopted the use of higher strength reinforcing steels in practice due to lack of knowledge and comfort level with implementing new technologies and techniques, and the serviceability and durability concerns. In addition, bridge surveys among 18 states have shown that fire has caused more bridge collapses than earthquakes. In general, there are three common types of ASTM steel bars that are produced with yield stresses above 60 ksi: ASTM A615, ASTM A706 and ASTM A1035 (CL, CM and CS based on carbon and chromium content). Given the lower ductility of HSRS rebars compared to conventional reinforcement along with the lack of knowledge on different types of HSRS and their behavior when exposed to elevated temperatures, studying the behavior of HSRS after high temperature exposure is deemed to be necessary. In order to fill this gap, four different tests are conducted on three different ASTM reinforcements (A615, A706, and A1035): monotonic and low cyclic fatigue tests of rebars, pullout (RILEM) and beam-end bond tests on standardized RC specimens. Each test is performed at both ambient and elevated temperatures. The results are reported and compared with the previous studies on conventional and HSRS reinforcements. The results of this study will allow states and authorities to make more informed decisions based on the enhanced knowledge on the behavior of HSRS in reinforced concrete transportation structures such as bridges.

Comments

Tran-SET Project 22STUTA21

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