Research On Puli Center’s Vertical Deformation Of Steel And Concrete Mixed Structure And It’s Pre-control Technology

The steel-concrete hybrid structure has been used more and more widely in the high-risebuilding due to its advantages such as giving full play to their respective advantages of steel andconcrete, short construction period, rational load-bearing capacity and economical. However, aprominent problem existing in this structure is the vertical deformation difference, which cancause the redistribution of internal force of components and structures, damage the components,and even make serious influence to structure. Therefore, the vertical deformation differenceproblem has become an attention topic in steel-concrete hybrid structure that urgently needs tobe controlled by posing some effective preventing measures.In this paper, the forming mechanisms of vertical deformation difference duringconstruction process was firstly studied and the causes of the vertical deformation difference ingeneral situation was analyzed, including uneven settlement of foundation, materialperformance, temperature changes in the structure, the influence of adjacent foundationbuildings and the effects of foundation pit construction, etc. Secondly, all the factors aboutaffecting the vertical deformation difference were analyzed, respectively. Then the factorsingredients and laws were analyzed. Finally, an engineering example of Jinan Puli center wasintroduced and simulated combining with the actual situation. For vertical deformation of JinanPuli produced during the process of construction, the traditional influence factors wereanalyzed one by one. Combining with the characteristics of the project, a conclusion wasobtained: the main influencing factors of the vertical deformation difference of Jinan Puli wereelastic deformation, creep deformation and shrinkage deformation. Compared with thecalculation principle and common calculation methods of elastic deformation, creepdeformation and shrinkage deformation, the best method was chosen combined with thisengineering. The numerical simulation was performed by the use of the finite element programANSYS. Three methods were commonly used for modeling: a loading method, the method ofapproximately simulating construction process and the method of accurately simulating theconstruction process. But these three computational theories vary in the load infliction andstructural stiffness. The method of accurately simulating the construction process was chosen inthis paper because it can better simulate the change of vertical deformation difference and internal force of the project. The vertical deformation under the action of elastic deformation,creep deformation and shrinkage deformation were respectively simulated during the use ofANSYS simulation. A few results were gained as follows: the vertical deformationaccumulation of structure reaches the maximum in the middle floors while the smaller values atboth ends. Also, the proportional relationship of influencing factors between the steel frame andthe core tube was obtained. At last, the vertical deformation difference between the steel frameand the core tube under the joint action of the elastic deformation, creep deformation andshrinkage deformation was got. Conclusion obtained from the data curve was that verticaldeformation difference is the biggest in the middle floors while the lesser at both ends. At thesame time, the sensitivity sequence of the three kinds of influence factors on the verticaldeformation difference is: elastic deformation, contraction deformation and creep deformation.With the theoretical analysis for premise, combined with the actual engineering situation,pre-control technologies of the vertical deformation difference during the construction processfrom the aspects of design and construction were proposed on the basis of the conclusion above.