Article
Construction & Building Technology
Jianxin Zhang, Zonghu Pei, Xian Rong
Summary: This study investigated the effect of adopting a hybrid method, including high-strength steel reinforcement and high-strength steel fiber concrete, on the seismic behavior of beam-column joints. The results showed that using this method can improve the seismic performance of the joints, reduce concrete damage, and enhance ductility and energy dissipation capacity.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Tingting Lu, Kai Guan, Jiaojiao Pan, Xingwen Liang
Summary: The objective of this investigation was to study the influence of an Engineered Cementitious Composite (ECC) on the seismic performances of beam-column-slab subassemblies. Tests and simulations were conducted on several models. The ECC model exhibited 15% higher bearing capacity, 19% increased deformability, and 34% increased energy dissipation capability compared to the RC member. The use of ECC in the slab reduced the contribution of reinforced bars to the flexural strength of the beam, resulting in a prone for the ECC subassemblies to reach a strong column and weak beam yield mechanism.
Article
Engineering, Civil
Yu-Chen Ou, Jones Joju, Bo-Cheng Lai, Jui-Chen Wang
Summary: Reinforced Concrete column and Steel beam (RCS) structural systems are popular for office buildings in Taiwan due to the high seismic demand. High-strength materials are used to solve the problem of large size and overcrowded reinforcement in conventional concrete columns. However, the usage of high-strength materials in RCS systems is restricted in existing design guidelines, and innovative joint detailing and design are required for sufficient joint bearing and shear strength. This study developed a new high-strength reinforced concrete column and steel beam joint, using Grade 690 MPa steel reinforcement and Grade 84 MPa concrete, along with a specific joint detailing to improve bearing and shear capacity. Two large-scale subassemblies were tested to verify the seismic behavior of the proposed joint.
ENGINEERING STRUCTURES
(2023)
Article
Chemistry, Physical
Ke Shi, Mengyue Zhang, Tao Zhang, Pengfei Li, Junpeng Zhu, Li Li
Summary: This study aimed to improve the seismic performance of beam-column joints by reducing the concentration of reinforcement and utilizing steel fibers and reinforced high-strength concrete effectively. Experimental results showed that increasing the stirrup ratio, steel fiber volume ratio, and axial compression ratio in the core area can enhance the ductility and energy consumption of the joints, while the opposite is true for concrete strength.
Article
Chemistry, Physical
Jun Wang, Xinyu Yi, Qi Liu, Xueqi Fang
Summary: Based on low-cycle loading tests, this study systematically investigates the seismic performance of steel-reinforced concrete (SRC) frame columns with different design parameters. The results indicate that high-strength steel SRC frame columns exhibit improved displacement ductility performance and excellent seismic performance. Additionally, an increase in shear span ratio, steel content, and stirrup ratio enhances the seismic performance, while an increase in axial compression ratio decreases the seismic performance.
Article
Engineering, Civil
Sheng Jiang, Gang Shi, Naizhou Zhang, Huatian Zhao, Teng Sun
Summary: Cover-plate reinforced connections are a practical choice for high strength steel frame seismic applications as they can shift the plastic hinges of the beam away from the column. Through testing and analysis of these connections, it has been shown that they meet seismic requirements and exhibit satisfactory performance. The study also highlights some design limitations that need to be considered when using electroslag welding process.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
W. M. Hassan, M. Elmorsy
Summary: The use of High Strength Steel (HSS) reinforcement in concrete construction has been rapidly increasing, especially in high performance concrete applications. Recent experimental and analytical research has led to the approval of the use of HSS reinforcement Grades 80 and 100 in earthquake-resistant concrete components. While HSS reinforcement offers benefits such as reduced bar congestion and more effective concrete confinement, attention must be paid to drawbacks such as lower hysteretic energy and potential for premature confined concrete crushing. Various concrete structural components reinforced with HSS have been studied, and a comprehensive database of cyclic tests on HSS reinforced components has been established and evaluated to aid in future experimental and analytical studies on seismic response and design of HSS reinforced concrete components.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Xiaowei Zhang, Xian Rong, Xiaona Shi, Jianxin Zhang
Summary: This paper presents the results of cyclic load tests and analysis on full-scale beam-column joints using 600 MPa high-strength reinforcement as beam longitudinal reinforcements. The study focuses on evaluating the impact of the relative length of beam bars through the joint (hc/d) on the seismic performance of high-strength reinforcement beam-column joints, considering variables such as axial compression ratio, shear compression ratio, and transverse reinforcement ratio. The test results show that the use of high-strength steel bars improves the failure pattern, load-bearing capacity, and energy dissipation of the joints.
Article
Construction & Building Technology
Yu-Chen Ou, Jones Joju, Meng-Yi Hsieh
Summary: This study conducted cyclic loading tests on five beam-column joint specimens to investigate the effectiveness of using unstressed Grade 1860 MPa steel strands as replacement for Grade 420 MPa deformed bars for beam longitudinal reinforcement. The study also developed a special hooked anchorage detail for the steel strands in the joint region. While the full and partial replacement of deformed bars by strands resulted in decreased energy dissipation, it enhanced the reentering capabilities of the beams. The research also proposed modifications to the conventional seismic design procedure to incorporate the use of strands as beam reinforcement.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Physical
Ke Shi, Mengyue Zhang, Tao Zhang, Ru Xue, Pengfei Li
Summary: The present study numerically investigated the behavior of steel fiber-reinforced high-strength concrete beam-column joints under seismic action. It was found that increasing the concrete strength enhances the ultimate load, while adding steel fiber and increasing the stirrup ratio significantly improve the seismic performance of the joints.
Article
Construction & Building Technology
Fangfang Liao, Xiaohong Li, Wei Wang, Yiyi Chen, Tianhua Zhou, Shaofeng Nie, Gen Li
Summary: In this study, four high-strength steel welded cruciform beam-column connection specimens were designed with different forms of weld access holes and expanded beam flange configuration. Quasi-static tests were conducted, and the seismic performance of the specimens was studied, showing good performance. Finite element analysis (FEA) results were consistent with test results, and it was found that ductility of high-strength steel welded connections can be improved by changing the form of weld access holes.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Construction & Building Technology
Peizhen Xu, Zian Wang, Ben Mou, Daiming Gao
Summary: This study investigates the CFST column to H-shaped steel beam joint with outer annular stiffener through experiments, and finds that smaller column width-thickness ratio can improve the elastic stiffness and ultimate bearing capacity of the specimens.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Jianwei Zhang, Xinyi Tao, Juan Liu, Hongying Dong, Wanlin Cao
Summary: The study focused on a semi-precast high-strength recycled aggregate concrete column with high-strength reinforcement, discussing design parameters and test results. The seismic performance of the semi-precast columns was comparable to cast-in-situ columns, and the selection of core column diameter should be based on practical engineering requirements.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Civil
Jianwei Zhang, Xiao Liu, Wenliang Kan, Man Zhang, Juan Liu
Summary: Quasi-static tests were conducted on full-scale steel tube-reinforced high-strength concrete columns with ultra-high strength steel bars. The results showed that steel fiber-reinforced STRHSC columns with UHSS had superior damage control capability and reparability. A prediction model for skeleton curve, residual deformation, cumulative energy dissipation, and hysteretic curve was proposed and verified.
JOURNAL OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Civil
Jianwei Zhang, Xiao Liu, Juan Liu, Man Zhang, Wanlin Cao
Summary: Ultra-high-strength steel bars (UHSS) were innovatively applied in high-strength recycled aggregate concrete (HSRAC) columns to achieve resilient structures cast from green building materials. Quasi-static tests were conducted on five new pattern columns to investigate seismic performance and reparability. The influence of UHSS substitution ratio and recycled coarse aggregate replacement ratio on seismic response and damage evolution of HSRAC columns were discussed. The research showed that configuring UHSS in the HSRAC columns could obtain drift-hardening property, and the residual displacement and crack width meet the requirements of repairable limit at the drift ratio less than 3%. The application of recycled aggregate concrete had negligible effect on the seismic performance and reparability of columns, and even contributed to improving their reparability probability. Moreover, reparability assessment methods were established based on the damage evolution theory and measured results, and prediction models of skeleton curve and reparability probability of HSRAC columns were proposed. The models were then verified by comparing the prediction results with test results.
ENGINEERING STRUCTURES
(2023)
