Mulitistory, Large-span And Over-length Mixed Structure Design And Theory Research

With the development of the economy of our country, the construction market is growing quickly. And architecture designs differ much from each other in the layout of plane and space, sculpt and form. In the result, the structural designs become more and more complex, which bring on many questions that are needed to study and settle.In the paper, through the example of the waiting hall of XT an International Airport, several main questions meet in the design have been discussed, analyzed and solved, which include in negative friction force around pile in collapsible loess, the calculating method of bearing capacity of pile. The crack control methods of analysis and design in the super-length reinforced structure have been tested in the project, and reached the effect to be hoped. The questions meet in the project which is low and large-spaced structure are universal, and the methods are practical in the high-rise.in the paper, the principle and the schemes to be selected of ground treatment have been discussed firstly. Especially when the self-settlement of soil layer has not been eliminated entirely through dynamic compaction in shallow soil layer, the friction force will appear around piles. The calculating method of negative force has been discussed, too. Secondly,the producing mechanism of crack in reinforced structure and factors which affect crack have been discussed, In the emphasis, the method is expounded, which applies first releasing then resisting, combination of releasing and resisting. In the method, flexible slit is applied firstly, which can make deformation of structure distributed, and decrease deformation energy, thenthe tiny expansion concrete and prestressed concrete with unbonded tendons are applied. And in the different phase, the compressive prestress is put on the concrete structure. In the result, the tensile stress which is produced because of temperature gap has been decreased or eliminated entirely. Combined with some other measures, the construction and design for non-expansion joint of super-length structure has been carried out successfully.In addition, the paper introduces the seismic design of open top floor, the design of steel cover, the test of static bearing capacity of pile and the test of wind tunnel experiment.Based on the engineering experiment, and theoretical analysis and test research, the paper brings forward methods to solve the questions meet in the engineering, and make theoretical analysis, test research and engineering practice integrate closely, which offers some reference for similar project design in the future.