The ninth Kwang-Hua forum was successfully held in Tongji University on December 10-12, 2021. The forum was jointly hosted by College of Civil Engineering of Tongji University, State Key Laboratory of Disaster Reduction in Civil Engineering, International Joint Research Laboratory of Earthquake Engineering, Earthquake Resiliency Committee of Seismological Society of China and Shanghai Engineering Research Center for Resilient Cities and Intelligent Disaster Mitigation. Twenty-four well-known exp