On September 3, 2018, Dr. Rolands of Nottingham Trent University visited the Department of Civil Engineering, Tsinghua University, and gave a presentation titled "Characterizing and interpreting thermal response of bridges & Measuring structural deations using smartphones". Professors Xiaodong Ji, Zhang chonghou, Zhao zuozhou and postgraduates of the Department of Civil Engineering of Tsinghua University participated in this presentation and discussed the related contents with Dr. Rolands.

The lecture is comprised of two parts, and Dr. Rolands introduced us to some of his achievements in the field of structural health monitoring. In the first part, based on the nonlinear regression model, Dr. Rolands proposed the regression-based thermal response prediction methodology of bridge structure. The effectiveness of the method is verified by experiments. The application is demonstrated in multi-span continuous beam bridge for damage detection. The second part of the lecture focused on the displacement measurement method based on smartphone images and videos. Examples of the method on static, quasi-static and dynamic tests are presented, and application of real-world bridges for displacement monitoring is illustrated. In addition, a study of multi-epoch imaging approach to collect accurately structural displacements when capturing images of a structure from different positions is introduced.