Overall Process Simulation Of Construction And Analyses Of Seismic Behavior For High-Rise Steel-Concrete Hybrid Structure

With the development of the high-rise buildings, more and more steel-concrete hybridstructures have been applied in China in these years. The current study about the structuralsystem focus on the structural analyses and design, but the research about constructionprocess and the impact on the seismic structure is relatively scarce. Under vertical gravityloads, the differential shortening between columns and core tubes in the steel-concrete hybridstructure can not be ignored as a result of the difference of stress levels and concreteshrinkage and creep. This will produce the effect on the internal force of the elements andseismic behavior of the structure. Software ABAQUS is widely applied in elastic-plasticanalyses of the tall building. For keeping the continuation and reliability of structural analyses,this paper uses software ABAQUS to simulate and analyze the construction process of a30storey steel-concrete hybrid structure. Considering Shrinkage and creep of concrete, theleading construction of reinforced concrete tube, and as the beginning condition,elastic-plastic dynamic analyses of the structure under severe earthquake are presented. A setof research method on Overall Process Analyses and Simulation of High-Rise Steel-ConcreteHybrid Structure from Construction Process Simulation to Seismic Behavior of the Structurehave been built, which will benefit further design and construction of hybrid structures.1. According to the suggestion for high-rise hybrid structure, core tube concrete is generallyconstructed ahead of steel frames10-14storey in “Specification for design of steel-concretemixed structure of tall buildings”(2008). Accurately simulate construction process areconducted when core tube is constructed ahead of steel frame0、5、10、11、12、13and14storey and compared with the results using once loading method. The results show thatchange of internal force and structural vertical deformation is very close when core tube areconstructed ahead of10-14storey, except for5storey. When core tube is constructed aheadof steel frame0storey, the vertical deformation is bigger for steel frame and smaller forcore tube compared with the status that the core tube is constructed ahead of steel frame,2. Construction process simulation of a steel-concrete hybrid structure is studied andconstruction procedure, the leading construction10or14storey of core-tube, the constructionleveling compensation，ACI209R-92and CEB-FIP(MC90)predicted model of concrete creepand shrinkage are taken into account. The results show that The maximum of verticaldeformation and their differential deformation arise the middle-upper storey of the structure.vertical deformation due to the concrete shrinkage and creep will be about80%of totaldeformation，vertical deformation difference between core-tube and steel frame due to theconcrete shrinkage and creep holds a larger proportion of total vertical deformationdifference. The support moments and shear of coupling beams connecting the core-wall are increased as a result of the vertical differential deformation. Furthermore，Constructionprocess simulation of a steel-concrete hybrid structure with rigid and hinge tube-to-beamconnection is studied. The results show that vertical difference with rigid connection is largerthan that with hinge connection, which will make the structural construction more difficult.Construction process simulation of a steel-concrete hybrid structure with rigid and hingetube-to-beam connection is studied and construction procedure, the leading construction ofcore-wall, the construction leveling compensation，the concrete creep and shrinkage are takeninto account. The results show that vertical difference with rigid connection is larger than thatwith hinge connection, which will make the structural construction more difficult.3. Construction process simulation of a steel-concrete hybrid structure is studied andconstruction procedure, the leading construction10storey of core-wall, the constructionleveling compensation，ACI209R-92and CEB-FIP(MC90)predicted model of the concretecreep and shrinkage are taken into account. The results show that vertical deformation andvertical deformation difference with model ACI-92is larger than that with modelCEB-FIP(MC90), so that reasonable selection of predicted model of the concrete creep andshrinkage is very important when structural design and construction process simulation arecarried out combining with materials and construction condition.4. Considering initial condition due to construction process and the concrete shrinkage andcreep, elastic-plastic dynamic analyses for a steel-concrete hybrid structure are presentedunder severe earthquake and compared with the result with no initial condition. The resultshows that the coupling beam connecting frame and concrete tube will enter into nonlinear inadvance. Strengthened measures should be made in the design of structure.