›› 2016, Vol. 37 ›› Issue (S1): 583-590.doi: 10.16285/j.rsm.2016.S1.076

• Numerical Analysis • Previous Articles     Next Articles

Equivalent input of soil-structure interaction system considering radiation damping

LEI Su-su1, GAO Yong-tao1, PAN Dan-guang1, 2   

  1. 1.School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
  • Received:2015-10-29 Online:2016-06-16 Published:2018-06-09
  • Supported by:
    This work was supported by the Open Foundation of State Key Laboratory for Disaster Reduction in Civil Engineering (SLDRCE15-01).

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Abstract: Taking account of soil-structure interaction on seismic wave input, based on the theory of a two-step method, equivalent seismic wave input considering radiation damping effects is established. Firstly, the base response of single degree of freedom system is considered as the input of superstructure; and then damping ratio of the system is calculated by the state-space method considering soil-structure interaction, which is used to modify the damping coefficients of superstructure; thus the impact of soil-structure interaction is approximately calculated from the response of rigid foundation. Subsequently, a single degree of freedom system and a five-story frame structure are analyzed; numerical examples show that the calculation errors even exceed 100%; while directly taking seismic wave of free field and bedrock as the input of superstructure. However, the calculation errors of the two-step method are less than 10%; furthermore, the calculation errors will be less than 5% adopting the modified damping two-step method, which can satisfy the requirements of engineering.

Key words: radiation damping, soil-structure interaction, equivalent input, seismic response

CLC Number: 

  • TU 443
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