Structural Damage Detection Of Framework And Inversion Of Ground Motion

With the development of civil engineering technology,many large and complex buildingshave been built in our country,while the security of structure has becomea noteworthy problem.Suffering from the long-term influence ofload and aseries ofnatural disasters,there will be structural damage occurring in the buildings inevitably,while thesteady accumulation of damage will leave behind potential dangers for the accident.Detecting the damage to the structure regularly,the damage can be repaired in a timely manner to avoid the accident.Therefore,the structural damage detection has become a hot research topic in the field of civil engineering.In the paper,a deep research onthe structural damage detection of framework under different conditions has been made.The main work ofthis paper is as follows:Firstly,thetechnologyof the structural damage detectionat home and abroad is presented in this paper and the advantages and disadvantages of different methods are also analyzed.Secondly,the integral operator transformation method was introduced to reconstructresponse information,which makes it possible to complete the structural damage detection by the least squares detection algorithm under the known input and incomplete output dynamic response information.The auxiliary conditions were implanted inthe detection process,and then with the help of statistical average method to constitute a compositeinversion detection algorithm.Consequently,the algorithmunder the condition of unknown input was used to accurately diagnose the degree and location of structural damage,also the more accurate ground motion time history can be got by the inversion.Thirdly,substructuretechnique called generalized composite inversion detection algorithm which combines composite inversion detection algorithm and the extended Karmanfilter detection algorithm was used to solve the structural damage detection problemunder unknown input informationand only partially knownmeasuring points of dynamic response information.Finally,in order to get dynamic response information of the structural model,a 5 layers frame model shaking table test is used in this article.Meanwhile,the least squares detection algorithm,composite inversion detection algorithm and generalized composite inversion detection algorithm are applied to detect damageof the test model,which proves that those proposed methods are effective and reliable in damage detection.