Abstract
Uneven foundation settlement is one of the common engineering problems in a collapsible loess area. In order to study the influence of uneven foundation settlement on the seismic performance of a structure, the incremental dynamic analysis (IDA) method is used to analyze the seismic vulnerability of the steel structure frame. The differences in the seismic response of the structure in relation to uneven foundation settlement are analyzed. The influences of uneven foundation settlement quantities and various areas of uneven settlement on the seismic response of the structure are discussed. On this basis, the relationship between ground motion intensity and structural failure probability is studied, by changing the magnitude of seismic acceleration peaks. Compared with the unsettled structure, the internal force redistribution of the structure caused by uneven foundation settlement is one of the causes of earthquake damage for some components. The uneven foundation settlement located at the corner of the plane of the structure is likely to cause more serious earthquake damage to the structure. Uneven settlement will cause an increase in storey drift. With the increase in settlement, the seismic damage of the superstructure will be aggravated.
Highlights
IntroductionWhen the construction of a tunnel results in local cavities and insufficient thickness around the tunnel lining, this causes uneven settlement of the adjacent surface buildings’ foundations and possibly unrecoverable damage [1,2,3]
When the construction of a tunnel results in local cavities and insufficient thickness around the tunnel lining, this causes uneven settlement of the adjacent surface buildings’ foundations and possibly unrecoverable damage [1,2,3].Regarding this problem, much research has been carried out
1.2 g, some components in the structure yielded, and the structural response caused by the earthquake under the given seismic action can be determined, which provides a basis for the damage reached a relatively stable state
Summary
When the construction of a tunnel results in local cavities and insufficient thickness around the tunnel lining, this causes uneven settlement of the adjacent surface buildings’ foundations and possibly unrecoverable damage [1,2,3]. Regarding this problem, much research has been carried out. Most of the research on structural deformation assessment is carried out on greenfield ground [11], but the evaluation results are conservative [12]. Uneven settlement is a kind of foundation deformation that occurs often jeopardizing the safety of the building structure. The seismic vulnerability analysis and evaluation of the structure are carried out by determining the damage index and performance parameters of the structure
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