Study On Seismic Response Of Loess Foundation-multi-ribbed Composite Wall Structure Interaction System

Multi-ribbed composite wall structure is a green model which can be fabricated structure,it has many features,such as light,energy saving,environmental protection,thermal insulation,shock absorption and integration,with a construction fast,economical and practical.Currently it has put into use in Shaanxi,Hebei,Ningxia,Henan,Qinghai and other provinces and cities.In the structural design calculations,usually it have not yet considering soil structure interaction,especially the lack of research in the dynamic interactions need to be further analyzed and discussed.Based on pre-multi-ribbed composite wall structure research,at the same time according to the National Natural Science Foundation of China(51178385)requirements,this paper use shaking table test and numerical simulation to conduct comparative study on seismic response of loess foundation-multi-ribbed composite wall structure interaction system.The main contents and conclusions are as follows:(1)It summarizes the research status of foundation-structure interaction and loess foundation,discussing the research methods of foundation-structure dynamic interaction.This paper has built with a multi-ribbed composite wall structure as the prototype,designed and completed 1/15 ribbed multi-ribbed composite wall structure reduced scale shaking table test.Test carried out in two stages,the first stage is soil-raft foundation-multi-ribbed composite wall structure shaking table test,the second phase is raft foundation-multi-ribbed composite wall structure shaking table test.Under the two-stage,test have an analysis of the seismic response of loess foundation,superstructure displacement response and acceleration response,revealing the influence of interaction on multi-ribbed composite wall structure displacement and acceleration.(2)Use the two-stage shaking table test as prototype to establish numerical model and input seismic wave.The results of numerical simulation and shaking table test results were compared to obtain a good agreement.(3)By finite element model under different seismic intensity seismic response of loess foundation to study the effects of acceleration and displacement structure interaction under seismic loads,also discuss the displacement composition of multi-ribbed composite wall structure top floor on interaction.The results show that the loess have an amplification on seismic waves,and can filter out certain seismic waves,playing isolation effect.multi-ribbed composite wall structure top floor displacement on dynamic interaction is mainly composed by structural deformation and foundation rotational displacement,the proportion of base sliding displacement cause smally.Design Calculation results provide a reference for multi-ribbed composite wall structure.