【摘要】 义马某气化炉厂房,长56 m,宽19.5 m,高56 m,为"板型"钢筋混凝土框架结构体系。考虑该厂房中设备对系统动力特性的影响,采用大型有限元软件ANSYS对结构的自振特性进行分析。结果表明:结构在第四、五阶模态呈现翘曲模态,充分显示了结构的厚板特征。通过对3种地震波作用下结构位移和加速度响应的对比分析,显示框架结构对天津波反应比较敏感。通过对地震信号进行FFT变换,显示结构前5阶频率均处于天津波能量谱最大范围内,证实了结构对天津波敏感的原因。更多还原

【Abstract】 The Yima gasification furnace workshop,which is 56 m long,19.5 m wide and 56 m high,is made up of high-rise reinforced concrete frame.Structural dynamic performance is studied by considering the effect of the devices with in the workshop on the frame.The natural vibration characteristics are analyzed by using the large general structure analysis software ANSYS.The results show that the fourth and fifth modes are both buckling modes.It verifies the structure is of the plate-shape character.The frame is more sensitive to Tianjin wave through comparison of the displacement and the acceleration of the frame under three seismic waves.FFT transform to seismic signal demonstrates that the first five modes of the structure all lie in the range of maximum energy spectrum of Tianjin wave.It explains the reasons for the sensitivity of the frame to Tianjin wave.更多还原