Research Topics 丨研究方向
Low-damage earthquake resilient structural systems
The current seismic design philosophy aims to ensure the performance objectives (i.e., life safety and collapse prevention) of structures by dissipating energy in carefully selected “sacrificial” regions (e.g., plastic hinges) during severe earthquakes. However, severe damage accompanied by considerable residual (permanent) deformation commonly requires costly repair, or even demolition, after strong earthquakes, thereby resulting in significant socioeconomic losses in terms of building reconstruction and occupation downtime. These recent earthquakes indicate that the current seismic design concept does not consider rapid recovery of normal serviceability after a severe earthquake and cannot meet the requirements for resilience and sustainability of modern societies. The research topic of our group is to develop high-performance low-damage earthquake resilient structural systems to address the above problems.
Self-centering coupling beams 丨自复位连梁
Applications of shape memory alloys (SMAs) in Earthquake Engineering
Shape memory alloys (SMAs) are high-performance metallic materials that can undergo considerable strains and recover their initial shape through heating (shape memory effect) or unloading (superelastic effect). The superelasticity of SMAs is particularly attractive to the field of earthquake engineering because of its inherent flag-shaped hysteretic loops, which are associated with minimal residual deformation under cyclic loading. Moreover, the excellent corrosion-resistance performance and high fatigue resistance of nickel–titanium (NiTi) SMAs can overcome the aging, durability, and maintenance issues in the life cycle of civil infrastructure.
NiTi SMA bars 丨镍钛SMA材料
Seismic performance of reinforced concrete structures
Reinforced concrete structures are widely used in low- and high-rise buildings constructed in seismic regions due to their high lateral stiffness and strength. A current focus on earthquake engineering research and practice is the development of performance-based seismic design (PBSD). As accepted generally by the researchers of structural engineering, PBSD method provides a promising solution for the design of seismic-resistant structures. The PBSD aims to improve structural engineering by providing engineers with the capability of designing structures to achieve a variety of seismic performance levels, and it allows structures to experience damage to a certain extent during earthquakes, which necessitates making the definition of certain damage levels corresponding to the different performance level of structures.
Seismic behavior of SRC core walls 丨钢-混凝土组合筒体抗震性能评估
Metallic dampers are one of the most effective energy dissipating devices to mitigate the earthquake response of structures. A variety of passive dampers have been developed and widely used in the high seismicity regions due to the ease of manufacturing and installation and the properties of stability and robustness. Metallic dampers exhibit fat hysteresis loops with excellent energy dissipation capability. Consequently, these metallic dampers can protect the main structures under earthquake shakings, which is a desirable characteristic in the conventional seismic design philosophy. However, the inherent inelastic deformation of the metallic dampers, in turn, results in apparent damage accompanied by a large range of permanent deformation after unloading. Structures designed with these metallic dampers, particularly with low post-yield stiffness, are vulnerable to residual drift after strong earthquakes.
Superelastic SMA U-shaped dampers丨超弹性SMA-U型阻尼器
Seismic performance and retrofitting of non-seismically designed existing structures
Seismic safety of a large number of existing non-seismically designed reinforced concrete structures is a major concern around the world. Evidence from past earthquake reconnaissance demonstrated that non-seismically designed RC buildings are vulnerable to substantial damage or even collapse under moderate to severe earthquakes. Non-seismically designed structures mainly feature inadequate reinforcement details, such as a lack of joint transverse reinforcement, insufficient transverse reinforcement in columns, column lap splice located in potential plastic hinge regions, and inadequate anchorage detailing.
Numerical model of non-seismically RC frame 丨非延性RC框架数值模型
Research project of National high-level talent plan (Youth Program), Principal Investigator, 2021 - 2024.
国家青年人才项目, 负责人, 2021年 - 2024年.
Seismic performance upgrade and design method of existing reinforced concrete frame structures for urban renewal, Funded by the Ministry of Science and Technology of the People´s Republic of China, Principal Investigator, 2022 - 2023.
面向城市更新的既有钢筋混凝土框架结构抗震性能提升机理与设计方法研究, 科技部外国专家项目, 负责人, 2022年 - 2023年.
Novel earthquake-resilient structural systems and design theory. Funded by the Fundamental Research Funds for the Central Universities, Principal Investigator, 2021 - 2024.
新型震后可恢复功能结构体系与设计理论, 中央高校基本科研业务费专项资金, 负责人, 2021年 - 2024年.
Damage control of engineering structures driven by shape memory alloy devices. Funded by Key Laboratory of Deep Earth Science and Engineering, Principal Investigator, 2022 - 2023.
形状记忆合金装置驱动下的工程结构灾变控制, 深地科学与工程教育部重点实验室开放基金, 负责人, 2022年 - 2023年.
Non-disruptive external steel frame for the seismic upgrade of existing vulnerable RC building infrastructure. Funded by European Commission, IF Marie Skłodowska-Curie Actions (MSCA) Fellowship, Co-Principal Investigator, 2022 - 2022.
High-resilient rocking wall-frame structural systems with hybrid damping devices for earthquake load. Funded by Japan Society for the Promotion of Science (JSPS), JSPS Fellowship, Co-Principal Investigator, 2019 - 2021.
Deformation mechanism and seismic collapse analysis of a novel self-centering steel moment-resisting-frames. Funded by State Key Laboratory of Subtropical Building Science, China, Principal Investigator, 2020 - 2021.
新型自复位钢框架结构变形机理和抗倒塌能力分析, 亚热带建筑科学国家重点实验室开放基金重点项目, 负责人, 2020年 - 2021年.
Novel damage-free steel column base connection towards earthquake resilience. Funded by Failure Mechanics & Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, Sichuan University, China, Principal Investigator, 2019 - 2020.
面向震后功能可恢复的新型钢柱脚形式研究, 破坏力学与工程防灾减灾四川省重点实验室开放基金项目, 负责人, 2019年 - 2020年.
High-performance self-centering steel columns with shape memory alloy bolts for earthquake resilience. Funded by State Key Laboratory of Green Building in Western China, Principal Investigator, 2019 - 2020.
高性能震后功能可恢复钢柱的抗震性能研究, 西部绿色建筑国家重点实验室开放基金重点项目, 负责人, 2019年 - 2020年.
Seismic behavior of low shear-span ratio composite shear wall with embedded steel plate. Funded by State Key Laboratory of Subtropical Building Science, China, Principal Investigator, 2017 - 2018.
低剪跨比内置钢板混凝土组合剪力墙非线性剪切机制研究, 亚热带建筑科学国家重点实验室开放基金重点项目, 负责人, 2017年- 2018年.
Seismic performance of steel plate-concrete composite shear walls. Funded by Tongji University (Excellent Doctoral Student), China, Principal Investigator, 2012 - 2014.
钢板组合剪力墙抗震性能评估, 同济大学博士研究生学术新人科研基金, 负责人, 2012年 - 2014年.