Prof. Faxing Ding

School of Civil Engineering, Central South University

Ding Faxing: he was born on January 1979, from Ruian, Zhejiang, serving as the Doctor of Engineering, Professor, and Doctoral Supervisor. He is the Winner of the New Century Excellent Talents Support Program of the Ministry of Education and the Hunan Outstanding Youth Fund, concurrently serving as a Standing Committee Member of the China Construction Metal Structure Association Inspection, Appraisal, Reinforcement and Reconstruction Branch, the Director of the Building Structure Branch of the Architectural Society of China, and Deputy Director of the Hunan Prefabricated Construction Engineering Technology Research Center. He graduated from Central South University with a bachelor’s degree in architectural engineering, on June, 2000 and graduated with a doctoral degree in structural engineering from Central South University, on September, 2006. He was promoted to Associate Professor on October, 2006 and Professor on October, 2011.

Ding Faxing mainly engaged in scientific research in the field of steel-concrete composite structure, and published more than 170 scientific research papers, including 80 papers included in SCI (44 as the first author, 24 as the corresponding authors), with more than 800 citations, and 50 papers included in EI. His Chinese papers have been cited more than 2,000 times, and 11 national invention patents have been authorized. He won two First Prizes for Scientific and Technological Progress in Hunan Province (ranked NO. 2 and NO. 8), and a First Prize of China Railway Society (9). He cultivated 6 doctors and 37 masters, among whom, a person won the Hunan Excellent Doctoral Dissertation Award and two persons won Provincial Excellent Master Dissertation Award; the results were included in the China Engineering Construction Standardization Association Standard “Steel-Concrete Composite Bridge Design Guide”; he serves as the reviewer of a number of important international journals and well-known domestic magazines.

In addition, he has made innovative results in the fields of concrete strength and constitutive models, complex forces of concrete-filled steel tube columns, and seismic resistance of column structure systems.

Speech Title: Damage ratio strength theory for concrete and isotropic rock

Abstract: Since 2006, the author has found the tensile damage ratio and the compressive damage ratio of brittle materials in inelastic stage as two basic variables of the strength criterion. The expressions of the inelastic principal strain rate and the energy dissipation rate of cast iron were derived, the general expression of the damage ratio strength criterion for engineering materials was establish, and the simplified damage ratio strength criteria for materials under confining triaxial condition and biaxial stress states were established. Among them, the general expression can be reduced to the von Mises yield criterion for plastic materials, and the simplified confining triaxial criterion for brittle materials is the same as the Mohr-Coulomb strength criterion. The compressive damage ratio affected by both the Lode angle and the hydrostatic pressure is generally greater than 0.5, which makes the volume and failure surface of materials expand. The tensile damage ratio is generally less than 0.2, which makes the volume and failure surface of materials shrink. Based the above rules and the characteristics of the failure surfaces for various types of concrete and rock, a six-parameter expression of the damage ratio variable was established. The six empirical parameters in the damage ratio expression of various types of concrete and rock and the three empirical parameters in that of cast iron are recommended, which are verified by over 1700 experimental data points of various types of concrete, rock and cast iron. In addition, an empirical parameter of the simplified confining triaxial strength criterion and four empirical parameters of the simplified biaxial strength criterion were recommended.