Vice President of Tongji University,
Professor of Structural Engineering
Xiang-Lin Gu, full Professor at Tongji University since 2000. He is Vice President of Tongji University, Director of International Joint Research Laboratory of Earthquake Engineering, Director of International Joint Research Center of Earthquake Engineering, Director of Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education. He is also the Committee Member of The International Scientific Committee on the Analysis and Restoration of Structures of Architectural Heritage (ISCARSAH), President of ACI China Chapter, Vice President of RILEM China Chapter, and Vice President of China Civil Engineering Society.
Prof. Gu's main research interests include life-cycle design and maintenance of engineering structures, damage process analysis of materials and structures, structural performance enhancement, innovative structural materials and systems. He is member of editorial board of the journal "Frontiers of Structural and Civil Engineering" and guest editor of the journal "Construction and Building Materials". Author of over 260 publications, he has been funded by research grants funding over USD 4.5 million.
Keynote Lecture Title:
Seismic Behavior of Shear-Critical RC Columns under Different Lateral Loading Directions
Most experimental studies conducted on the seismic performance of RC intermediate short columns have imposed lateral deformations in a direction parallel to one of the columns faces (e.g., longitudinal or transverse directions). Similarly, most evaluation methods have also focused on the major-axis behavior. However, actual building columns are subjected to complex, multi-directional loading histories during earthquakes. As a step toward understanding and designing for this behavior, it is essential to evaluate the seismic performance of RC intermediate short columns for more general loading directions.
This study presents an experimental investigation carried out on RC columns failed in shear with an emphasis on how varying the directions of seismic loading influences the seismic failure mechanisms of the columns. The performance of these columns was documented in terms of their cracking patterns, shear strengths, effective stiffnesses, degrading stiffnesses, and inelastic shear deformations. Based on experimental results, a shear model was developed describing the biaxial seismic shear deformations and was implemented as a set of shear springs accompanied by a multisprings model to effectively reproduce the cyclic response of RC intermediate short columns subjected to general directions of loading. Verification of the proposed model with test data from this study and other experimental studies indicated that the model was sufficiently accurate to be used for the seismic evaluation and rehabilitation of existing buildings.