详情

Monotonic and cyclic behavior of high strength reinforcing steel (HSRS) after high temperature exposure

项目名称：	Monotonic and cyclic behavior of high strength reinforcing steel (HSRS) after high temperature exposure
摘要：	Conventional reinforced concrete transportation structures in North America often use Grade 60 reinforcing steel with a yield stress of 60 ksi. 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 this study, four different tests will be conducted on three different ASTM reinforcement (A615, A706, and A1035): monotonic and cyclic tensile tests (high strain low cycle), pullout and endbeam bond tests. Each test shall be performed at both ambient and elevated temperatures. After the test, each specimen will be analyzed using Energy dispersive X-Ray (EDX) and scanning electron microscopy (SEM) to investigate the possible change in material composition and failure analysis of fracture surfaces, respectively. The results will be 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.
状态：	Active
资金：	106000
资助组织：	Office of the Assistant Secretary for Research and Technology
管理组织：	Transportation Consortium of South-Central States (Tran-SET)
项目负责人：	Mousa, Momen R
执行机构：	University of Texas at Arlington
主要研究人员：	Jalali, Himan Hojat
开始时间：	20220401
主题领域：	Bridges and other structures；Highways；Materials；Safety and Human Factors