【摘要】 分析了简支梁结构的振动特性,建立了该结构损伤前后的有限元分析模型,模拟计算了简支梁结构在未损伤、一个损伤、两个损伤和三个损伤状况下的固有频率和振型,重点研究了不同损伤状况对它们的影响.发现损伤裂纹可使简支梁结构的固有频率降低,且其降低幅度随裂纹深度增大而增大,但不同位置的裂纹所产生的影响并不相同.模拟计算结果对简支梁结构损伤的检测和识别具有重要意义.更多还原

【Abstract】 The vibration properties of simple-supported beam are investigated.The finite element analysis models of undamaged and damaged simple-supported beams are developed based on the vibration properties to respectively calculate the natural frequency and the vibration mode of simple-supported beam with undamaged,one damage,two damages and three damages.The effects of different damages on the natural frequency and vibration mode are systemically studied.The simulation results indicate that the damaged cracks may lower the natural frequency,and the reduction content of natural frequency gradually increases as increasing the depth of damaged cracks.However,the effects of cracks are changed as varying the location of cracks.These results have important significance in detecting and recognizing the structural damage of simple-supported beam.更多还原