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Preliminary Analysis on Deformation of Reinforced Concrete Beam of Isolation Layer during Construction Process

DU Yong-feng1,2,WEI Zhong-bin1(1.Institute of Earthquake Protection and Disaster Mitigation,Lanzhou Univ.of Tech.,Lanzhou,Gansu 730050,China; 2.Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou Univ.of Tech.,Lanzhou,Gansu 730050,China)  
This paper simulated the construction process of isolated and traditional seismic-resistant structures.The internal force and deformation law of the girder in the isolation layers were analyzed in the two types of structures during construction.In addition,the reason for girder cracking in the isolation layers was examined by using the finite element method(FEM) to simulate cracking.The results show that girder cracking in the isolation layers is caused by construction loads,temperature fluctuation,and concrete shrinkage.During the period of construction,structural stiffness develops,which causes adverse reactions of shore deformation,temperature fluctuation,and concrete shrinkage to produce negative effects on long-term performance and durability of the structure.Such factors significantly affect both isolated and traditional seismic resistant structures.Compared with the traditional seismic resistant structure,the isolated structure,which has larger load effects,is more likely to encounter safety issues during the construction period.Each floor's internal forces reach the maximum when the templates of the floor beam are removed and concrete is poured on the structure.The isolation layers are the weakest parts and should therefore be given sufficient attention.
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