This book investigates the substructuring technology in structural health monitoring (SHM) to improve the accuracy and efficiency of the present SHM methods. SHM has been developed for monitoring, evaluation, and maintenance of civil structures. As the civil structures are usually large scale and a large number of sensors are deployed on a structure, accurate evaluation and maintenance of civil structures are always time-consuming. The book establishes a fundamental framework of substructuring method for the fast analysis of finite element (FE) model and monitoring data. Several practical civil structures are used for illustration. The book is intended for undergraduate and graduate students who are interested in SHM technology, researchers investigating the accurate, efficient, and effective methods in SHM field, and engineers working on evaluation and maintenance of civil structures or other structural dynamics applications.

Prof. Shun Weng received his B.E. and M.E. degrees in Civil Engineering from Huazhong University of Science and Technology (HUST), Wuhan, China, in 2004 and 2007, respectively, and the Ph.D. degree in Structural Engineering from The Hong Kong Polytechnic University (HKPolyU) in 2010. She joined in School of Civil and Hydraulic Engineering at HUST in 2011 and has been working as a professor since 2018.

Prof. Weng focuses on the research of structural health monitoring. Her research interests include computational method in structural dynamics, structural damage identification and assessment, SHM system, etc. Prof. Weng is awarded the National Science Fund for Outstanding Young Scholars, The Hubei Science Fund for Distinguished Young Scholars, Stan Shaw Award: Best Young Researcher Award, Chutian Scholar of Hubei Province. She is awarded the second prize of National Technology Invention Awards in 2018 and the first prize of Science and Technology Progress Awards of Hubei Province in 2014. Prof. Weng has published two books, more than 60 SCI papers, 17 patents, and six standards. She served as the associate editor of "The Monitor" and editor of several international journals. She is the member of international committee of Structural Health Monitoring of Intelligent Infrastructure (SHMII), and the China Civil Engineering Society, China Vibration Engineering Society and China Highway and Transportation Society.

Prof. Hongping Zhu received his B.E., M.E., and Ph.D. degrees in Civil Engineering from HUST. Prof. Zhu was the dean of School of Civil and Hydraulic Engineering at HUST and the director of Hubei Provincial Key Laboratory of Control Structure.

Prof. Zhu focuses on the research of structural health monitoring and vibration control. His research interests include structural dynamics, structural damage identification and assessment, seismic isolation and vibration control, etc. Prof. Zhu is awarded the National Science Fund forDistinguished Young Scholars and The Changjiang Scholars. He is awarded the second prize of National Technology Invention Awards in 2018, four times of first prize of Science and Technology Progress Awards of Hubei Province, and the first prize of Natural Science Awards of Hubei Province. Prof. Zhu has published four books and more than 200 SCI papers. He is the member of ASCE and SHMII, and several Chinese professional societies. He is the editor in chief of Journal of civil engineering and management, and the editor of several international journals.

Prof. Yong Xia received his B.E. and M.E. degrees in Civil Engineering from HUST, and the Ph.D. degree in Structural Engineering from Nanyang Technological University in Singapore. Prof. Xia is the associate head of Department of Civil and Environmental Engineering in The Hong Kong Polytechnic University (HKPolyU).

Prof. Xia focuses on the research of structural health monitoring. His research interests include Structural Health Monitoring, Structural Damage Identification, Finite Element Model Updating, Nonlinear Vibration of Cables, etc. He has researched on the SHM system of Tsing Ma Bridge in Hong Kong and Guangzhou Tower. Prof. Xia is awarded the Distinguished Young Scholars for Overseas of NSFC, Chang Jiang Scholars. He is awarded the second prize of National Technology Invention Awards in 2018 and the first prize of Natural Science Award of Ministry of Education. Prof. Xia has published seven books and standards, and more than 130 SCI papers. He served as the editor in chief of journal "Advances in Structural Engineering" and "The Monitor" and editor of several international journals. He is the member of ASCE and SHMII, and several Chinese professional societies.

1. Introduction.- 2. Substructuring method for eigensolutions.- 3. Substructuring method for eigensensitivity.- 4. Substructuring method for high-order eigensensitivity.- 5. Iterative bisection scanning substructuring (IBSS) method for eigensolution and eigensensitivity.