| Architectural curtain wall has been widely used for high buildings and infrastructures due to its unique expressive force,which has become an important part of modern architecture and an artistic form of expression.The safety level of curtain wall panel decreases with the increase of service time because of the material aging,fastener crossing,loosing and other reasons.Meanwhile,most of curtain wall projects locate in urban core area with large flow of personal,and the falling off of curtain wall panel is sudden.This means that the falling off of curtain wall panels potentially leads to severe consequences.However,the existing technology and quality evaluation system cannot meet the demand of curtain wall panel quality detection and safety warning.Therefore,how to quickly and accurately evaluate the current safety state of curtain wall panels and putting forward effective safety warning indicators are urgent practical problems that need to be solved.The hidden frame supported glass curtain wall(HFSGCW)and point-supported curtain wall(PSCW)were taken as research objects in this paper,and the relationship between safety-state of curtain wall panel and its modal parameters was mainly studied.Then,the remote laser vibration measurement technology was introduced into curtain wall detection,so as to realize the remote,rapid and accurate quantitative evaluation of curtain wall panel safety state.The main research results and conclusions are as follows.(1)The experimental conditions were set according to the possible safety problems in actual project.The relationship between the modal parameters and panel safety-state of HFSGCW was investigated using Data Acquisition&Signal Processing(DASP)modal test analysis system,As a result,the first order inherent frequency was put forward as the main safety parameter and the first order modal damping was used as auxiliary parameter to determine the curtain wall safety-state.Furthermore,the safety-state evaluation model of architecture curtain wall was established on the basis of the first modal parameter.(2)The feasibility of using the first order inherent frequency as the evaluation index of curtain wall panel stability was verified combining with the theoretical and ANSYS finite element analysis.The influence of mass parameters(including elasticity modulus,Poisson’s ratio and bonding strength)and geometric dimensions of structural adhesive on the vibration characteristic of curtain wall panel was systematically analyzed.And then,the relationship between the bearing capacity and modal frequency of curtain wall panel based on structural adhesive length and strength was discussed.Finally,the critical determination method of modal frequency in the stability evaluation model of curtain wall panel was proposed on the basis of bearing capacity and safety coefficient.(3)The influence factors of Laser Doppler Vibrometer(LD V)were explored and the feasibility of LDV in the safety detection of glass curtain wall was verified.On the basis of laboratory experiment and engineering application,a rapid evaluation model for curtain wall stability using remote laser vibration measurement technology was established,and a detection method for building curtain wall stability was developed.(4)Combined with the results of DASP and LDV,the identification method of structure adhesive debonding damage for HFSGCW was proposed according to spectrum curves.(5)The practicability of the research results and the feasibility of laser vibration measurement in curtain wall detection were verified relying on the PSCW of an airport in Guangdong province and the HFSGCW of a commercial building,Then,the stability detection method of curtain wall on LDV was improved. |
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