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自振频率是古建筑木结构振动特性的重要模态参数指标,准确计算其自振频率对采用数值方法分析结构的动力反应及对结构进行安全评估至关重要.本文基于实测振动数据,采用STD方法计算得到了光岳楼木结构的自振频率,并与东华振动测试系统的模态分析软件中OP.Polylscf算法计算得到的光岳楼木结构的自振频率进行了对比分析.表明:采用上述两种方法计算得到的反映木结构振动特性的1阶频率差别甚小;采用OP.Polylscf法计算光岳楼木结构的其他各阶频率均大于采用STD法计算结果,但误差均在5.7%以内,说明采用STD法计算木结构的自振频率具有较好的精度.
Natural frequency is an important modal parameter index of the vibration characteristics of ancient buildings and it is very important to calculate the natural frequency automatically by using numerical method to analyze the dynamic response of the structure and to evaluate the safety of the structure.Based on the measured vibration data and STD The natural frequencies of Guangyue floor wood structure were calculated and compared with the natural frequencies of Guangyue floor wood structure calculated by the OP.Polylscf algorithm in the modal analysis software of Tung Wah vibration test system. The difference of the 1st order frequencies which is calculated by the two methods is very small. The OP.Polylscf method is used to calculate the other order frequencies of the wood structure of Guangyue Lou, but the errors are all within 5.7% STD method to calculate the natural frequency of wood structures with good accuracy.