Biography: Dr. Zhanhui Liu, works in the School of Civil Engineering, Southwest Jiaotong University now. He is a Supervisor of Master's Candidates, the Overseas High-Level Talents in Sichuan Province, an expert on the National Science and Technology Collaborative Innovation Platform, a member of the Chinese Society of Mechanics, the Chinese Society of Vibration Engineering, and the Chinese Society of Architecture. He achieved his PhD in Solid Mechanics from Harbin Institute of Technology in 2015. From 2018 to 2019, the China Scholarship Council provided him with a full scholarship to visit University of Surrey in UK. He has been committed to the theoretical and practical research in the fields of bridge structural dynamics and impact dynamics for a long time. At present, his main research interests are bridge impact mechanism and anti-collision design, human-induced vibration of pedestrian bridges. He has undertaken more than 10 scientific research projects, and has published 20 papers, 2 authorized invention patents. Dr. Liu is teaching "Bridge Engineering", "Cable-supported Bridges" for undergraduate students, and "Conceptual Design and Innovative Design of Bridges" for graduate students. He has published one Chinese book and one English book as deputy editor.

Topic: New Progress on Impact Protection Research of Bridges Against Rockfall

Abstract: With the intensification of human engineering activities in mountain areas, as well as global warming, seismic activity and other factors, geological disasters in mountain areas occur frequently. According to statistics, collapse and rockfall account for more than 17% of all geological disasters, which are characterized by difficult prediction, strong suddenness, great randomness, serious disaster, and wide influences. For some rockfalls with small volume and low speed, they will generally cause local damage to the bridge. When encountering large rockfall impact, they may cause the overall damage of the bridge structure. Flexible shed tunnel is a common passive protection measure, which is very suitable for rockfall protection of bridges due to its lightweight structure and convenient installation. In order to study the response of the flexible protective shed tunnel of bridges under the impact of rockfall, LS-DYNA explicit dynamic analysis software is used, and the dynamic response of flexible shed tunnel and bridge structure caused by rockfall at different impact speeds, different impact locations and the simultaneous occurrence of multiple rockfalls is analyzed. Thus, the response laws of the three main components of the shed tunnel structure, namely, high-strength steel wire mesh, steel arch ring and steel beam, as well as the T-beam structure itself against rockfall are obtained. Then, based on the analysis results of the traditional flexible protective shed tunnel, a new flexible shed tunnel for prestressed simply supported T-beam bridge is further proposed, and the parameters of each component are optimized. All these research works provide a reference for the engineering design of bridge rockfall protection.