Behaviors of new RC bridge columns made of highly flowable strain-hardening fiber-reinforced concrete (HF-SHFRC) under cyclic loads

Wen Cheng Liao, Kuang Yen Liu, Chih Chiang Yeh

研究成果: Article同行評審

摘要

Remarkable development of high-strength concrete and reinforcement has been achieved nowadays. The purpose of the New Reinforced Concrete (New RC) project is aimed to reduce member section size by using high-strength concrete (f0c > 70 MPa) and high-strength rebars (fy > 685 MPa). Material consumption can be further reduced owing to the upgrade of strength. However, the brittle nature of high-strength concrete may also cause early cover spalling and other ductility issues. The addition of steel fibers is an alternative transverse reinforcement in New RC infrastructure systems. Highly flowable strain-hardening fiber-reinforced concrete (HF-SHFRC) has excellent workability in the fresh state and exhibits the strain-hardening and multiple-cracking characteristics of high-performance fiber-reinforced cementitious composites (HPFRCC) in their hardened state. This study aims to investigate the cyclic behavior of New RC bridge columns made of HF-SHFRC. Five large-scale bridge columns are subjected to cyclic lateral loading to verify their responses and deformation capacity. The test results show that by adding 1.5 % of high-strength hooked steel fibers, great deformation capacity is developed, in which either the stirrups spacing is increased to two times that of the control specimen or all tires are eliminated in New RC bridge columns. In addition, the accuracy of the proposed concept of equivalent lateral reinforcement is verified by the test results. Implementation of HF-SHFRC in New RC infrastructure offers opportunities to significantly simplify the design and construction of members for sustainable urbanization while ensuring adequate ductility and damage tolerance.

原文English
文章編號JTE20180091
期刊Journal of Testing and Evaluation
47
發行號3
DOIs
出版狀態Published - 2019 五月 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

指紋 深入研究「Behaviors of new RC bridge columns made of highly flowable strain-hardening fiber-reinforced concrete (HF-SHFRC) under cyclic loads」主題。共同形成了獨特的指紋。

引用此