Numerical Analysis of Crack Resistance of Concrete Structure of Ultra-Long Round Stadium During Construction

The ultra-long concrete structure produces internal force and deformation with temperature change and concrete shrinkage, which results in the cracking of horizontal structure specimens exceeding the tensile strength of the concrete. For an ultra-long round concrete stadium with a perimeter of about 670 m, the crack resistance of the main structure under different measures in construction was studied. Three-dimensional modeling was performed on the concrete structure of the first floor of the stadium by finite element software, and the construction process was realized through the birth and death element method. The contraction of the concrete in the main structure, as well as the expansion and the time-dependent elastic modulus of the concrete in the post-pouring belt were defined based on the subprogram. The simulation results show that when the east and west sides of the round structure are constructed from north to south in succession and finally integrated, concrete slabs at the northern corner of the early poured structure show the highest stress level because of temperature reduction and shrinkage. In addition, the expanded concrete in the post-pouring belt can effectively compensate for tensile stress and control cracks. The adjustment of structural integration time on days with low temperatures can greatly alleviate the influence of temperature on the structure. Furthermore, a rational construction sequence of the post-pouring belt can avoid the accumulation of plate stress along the structural length.