Stress assessment of steel structural members of an instrumented tall building

Pao Yue-kong Library Electronic Theses Database

Stress assessment of steel structural members of an instrumented tall building

 

Author: Fang, Zheng
Title: Stress assessment of steel structural members of an instrumented tall building
Degree: M.Sc.
Year: 2012
Subject: Structural health monitoring.
Construction industry -- Safety measures.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: ix, 125 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2554569
URI: http://theses.lib.polyu.edu.hk/handle/200/6863
Abstract: This dissertation mainly focuses on the application of Structural Health Monitoring (SHM) system in long-span spatial building structures. In recent years, great advances have been made in construction of long-span spatial structures in terms of number, style, and scale. Therefore, it is very significant to ensure the safety in both construction and operation stage. The application of SHM system in long-span spatial structures can help us have better understanding in the condition of structure. In this dissertation, by taking the floating platform of the New Headquarters of Shenzhen Stock Exchange (NHSSE) as an example, the key issues about SHM are investigated during the whole construction stage (especially at the unloading stage). The main contents of this dissertation are: (1) Introduction of the floating platform structure. The existing monitoring methods are substantially reviewed. The advantages and disadvantages of different methods of strain monitoring are summarized and compared. In combination with the actual situation of the structure, the appropriate monitoring method for the floating platform is chosen, and the SHM system of the floating platform is developed. (2) Processing of the strain monitoring data. Firstly, the effect of the environmental factors on stress monitoring is studied. Secondly, the strain monitoring data are described on different resolutions by using the wavelet transform method. The peaks and noises are filtered from the real-time monitoring signal by use of the wavelet denoising algorithm. Temperature-induced stress component is excluded using the theory of multi-resolution decomposition and the correlation coefficient. The stress signals after processing could well reflect the real stress responses during the construction process. Finally, the early-warning system of the floating platform is also proposed. (3) Real-time tracking the unloading process of the floating platform, the monitoring results of stress are analyzed to get the stress change status of floating platform, to make sure the unloading process in safety. Real-time tracking the whole construction process of the floating platform, the stresses of the key structural components are obtained and the effect of the welding process on the structural safety is experimentally studied. The monitoring results provide reliable technical support for the safety of the construction.

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