Abstract
Based on the double control criterion of displacement and energy, a new index, dynamical damage index, for describing the dynamical damage extent in the single layer latticed shell structure is set up. The calculate method and change law of all kinds of consuming energy under the seismic action in the latticed shell structures are studied. Then the expression of dynamical damage index erected by combining the plastic consuming energy and maximum displacement is present. Moreover, the compare among the three index, dynamical damage index, displacement and plastic bar quantity, is completed by large numbers of parameter analysis in the single latticed shell structures. The results show that the discrepancy of analytical conclusion is distinct among the three index, dynamical damage index, displacement and plastic bar quantity to the latticed shell with local weakening stiffness, and the results of dynamical damage index are more reasonable. The dynamical failure index is in effect for the quantificational analysis of dynamical failure for single layer latticed shells.
Highlights
With the increase of external dynamic load, dynamic response of single layer latticed shell structure would develop
According to practical analysis of latticed shell structure, displacement reflects the deformation of the structure but it is not able to distinguish structural damage accumulation process under cyclic load effect and plastic bar quantity reflects the grade of structural plasticity but it can’t distinguish the deformation of latticed shell during damaging progress [1,2,3]
The paper will accord the dual-control guidelines of deformation and plastic cumulative energy dissipation to establish and apply dynamical failure index to analyse the extent of dynamical failure of single layer latticed shell structure
Summary
With the increase of external dynamic load, dynamic response of single layer latticed shell structure would develop. Many of researches of single layer latticed shell structure describe the progress of structural dynamical failure and structural statue base on displacement index and plastic bar quantity index. The paper will accord the dual-control guidelines of deformation and plastic cumulative energy dissipation to establish and apply dynamical failure index to analyse the extent of dynamical failure of single layer latticed shell structure. It will provide five cut-off values of dynamical failure index according to the degree of single layer latticed shell structure [4,5,6,7]
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