Study On The Impact Of The Seismic Performance On The Grounding Mode For Structures Supported By Foundations With Different Locations

Structures supported by foundations with different locations refers to a kind ofstructure built on the slope. The ground base of the same structure unit is located indifferent elevations and beneath the highest ground point; the floors are set up accordingto the floor height. This kind of structure is widely built in mountain cities, is a typicalkind of structure built on slope. The special style of the structure leads to someproblems such as structural irregularity at transverse and vertical level and the off layerfeatures (the number of the off layers and the spans of the off layers) that can’t beneglected. Recent research demonstrates that the force on the first floor above the scarpis large, and this floor is the weak storey of step-terrace structure. This is distinct fromthe ordinary structural system that the largest force is on the bottom floor. Therefore, themethod and the measure of improving seismic performance of the step-terrace structureshould be researched.Taking the step-terrace structure that its ground columns of the first floor areconstrained by four kinds of style as the research object, this paper analyzes structureseismic performance of the four kinds of constraint under rare and frequent earthquake,researches into the law of seismic performance of step-terrace structure through anumber of examples on different inter-out and different layers. It compares the seismicperformance among the four kinds of constraint structures in state of elastic andelastic-plastic.The main conclusions of this article are as follows:①The four kinds of support are fixed support, articulated support, rubber bearingssupport and slide bearings support. Their constraints reduce successively, their structuralperiod increase successively, and their base shear force decrease successively.②When on the ground column at the bottom of the consolidation, the weak layerlocation off the layer structure is generally located in the ground, the second floor offthe more layers, layer cross out number the more the case on the ground columnbottomof the column and the beam end and connected to the grounding column, the easier it isdestroyed, the structure off the layer of partially destroyed lighter.③On the ground column off the layer structure of the hinge bearing constraints, onthe ground plane seismic performance has not improved significantly because of thegrounding of the column hinged grounding column damage to its upper end, the upper transfer.④When on the ground column sliding bearings or rubber isolation bearings off thelayer structure of the weak layer position is generally located in Canton, under the swaplayer part, especially across a small number of out, out layer some serious damage.However, when the fallen cross accounted for4/5of the total structure across several offthe layer of partially damaged lighter on the ground plane performance is significantlyimproved, showing a good seismic performance.