Abstract：Based on the engineering background of New Hongyan Tunnel in Chongqing, operational modal analysis test was carried out on a typical 2 story brick masonry structure under tunnel blast excitation. Accurate finite element model which could reflect the actual dynamic characteristics of brick masonry structure was investigated by using the representative volume element. Furthermore, the structure natural frequencies and modal shape analyzed were compared with the experimental modal data. Moreover, according to the first four modal parameters obtained from OMA test, based on the structure natural frequencies sensitivity analysis of masonry and concrete material parameters, the appropriate modifying parameters were selected and model updating of the brick masonry structure was performed. The first four natural frequencies of brick masonry structure are in 9～25Hz. Natural frequencies analyzed by using anisotropic model match much better with the experimental modal parameters than using isotropic model for the brick masonry. Besides, the correlation between the analyzed and experimental modal shape is good. Moreover, after updating density, elastic modulus and shear modulus parameters of the finite element model, the errors between analyzed frequencies and experimental results are reduced, and the dynamic characteristics parameters of the model are more close to the true values. The updating finite element model by using orthogonal anisotropic model for masonry is more accurate.
管晓明;傅洪贤;王梦恕;崔堃鹏;林凡涛. 基于OMA试验模态参数的砌体结构有限元建模及修正[J]. , 2014, 33(14): 181-187.
GUAN Xiao-ming;FU Hong-xian;WANG Meng-shu;CUI Kun-peng;LIN Fan-tao. Study on finite element modeling and model updating of brick masonry structure based on modal parameters obtained from operational modal analysis test. , 2014, 33(14): 181-187.
2014, Vol. 33 
