| There are some problems in mechanical properties and damping properties of concrete.Gradient Structural Concrete Based on Damping Enhancement(GSCDE)can give a better consideration to both mechanical properties and damping properties.At present,the research on GSCDE is mainly from the material point of view,but lacks the simulation study of its structural vibration characteristics.In order to solve this problem,the finite element method-Abaqus software is used.Based on testing the compressive strength,damping ratio,elastic modulus and apparent density of GSCDE,HPC and HDC,the finite element model of frame structure is established.The vibration characteristics of GSCDE structure are analyzed and compared with HPC structure and HDC structure.The vibration characteristics of GSCDE integral structure and local structure are studied.The main work and achievements are as follows:1.The deformation of GSCDE structure mainly concentrates on the structural column under modal mode,and the weak area mainly concentrates on the upper and lower floor area.The natural frequencies of GSCDE are 3.66 Hz and 3.68 Hz in the whole and local structures.2.Under the vibration displacement load,the internal energy curve of GSCDE structure increases first and then oscillates.The internal energy of the whole structure and the local structure is 6000 J and 6300 J.The difference between them is 5%.The internal energy of GSCDE structure is 20% and 16% lower than that of HPC structure and 33% and 40% higher than that of HDC structure.Therefore,in terms of internal energy,GSCDE has no significant change in the overall structure and local structure,and its damping energy dissipation stability is better than HPC structure,next to HDC structure.3.Under the vibration displacement load,the vibration offset values of the whole structure and the local structure vertex are 13.36 cm and 12.68 cm,the difference is3.8%,14.3% and 8.5% higher than that of HPC structure,and 11.1% and 15.6% lower than that of HDC structure,which is 11.69 cm higher than that of HPC structure.Therefore,in terms of vibration migration value,GSCDE has no significant change in the overall structure and local structure,and its vibration migration stability is better than HDC structure,next to HPC structure.4.Under the excitation of different frequencies,the forced vibration response of GSCDE structure increases first and then decreases.Under the effect of resonance at natural frequencies,the response peak values of the whole structure and the local structure are 7.3 cm and 7.8 cm.The difference between them is 3.8%,which is25.9% and 20.8% lower than that of the HPC structure,and 32.7% and 41.8% higher than that of the HDC structure.Therefore,in response peak value,GSCDE has no significant change in the overall structure and local structure,and its security under external excitation is better than HPC structure,next to HDC structure.The finite element method is used to analyze the vibration characteristics of GSCDE structure.It can take into account the damp energy dissipation,the stability of vibration offset and the safety of forced vibration.It also reflects the material economic benefits of GSCDE. |
