| With the national attention to new energy applications,wind power industry is booming in China’s new energy market.As the support structure of wind turbine,the tower is also developing to a higher height.At present,the theoretical calculation method of the tower structure is relatively weak,which is not conducive to the preliminary design and scheme analysis of the structure.In addition,there are many aspects worthy of improvement in the construction efficiency of traditional reinforced concrete tower,and the development of the industry also puts forward the demand for this.The use of new materials to develop new tower structures and achieve the improvement of tower construction efficiency and comprehensive benefits have become one of the important directions for the application research of wind power energy engineering structures.In this paper,a new type of tower structure system with supporting-wall composite section is proposed.Based on the current specification,the calculation method of shear torsion of horizontal joint and vertical joint of prestressed reinforced concrete cylinder with ultra-high height and tower with composite section of supporting wall is proposed,and the calculation expression of compressive bending capacity of prestressed ultra-high performance concrete(UHPC)tower is proposed.Based on ABAQUS finite element software,the influence of control parameters on the principal stress results of H140 prestressed UHPC steel-free tower was analyzed.The main research contents are as follows:1.Through the finite element elastic-plastic analysis of the prestressed concrete cylinder standard section and the composite section of the wall-supporting wall,the loaddisplacement curves and the stress nephogram under the complex stress state of pure shear,pure bending,pure torsion and compression bending,shear and torsion are given,and the failure mode of the tower is analyzed.2.Through finite element numerical simulation,the shear-torsional resistance calculation method of horizontal and vertical splice joints of prestressed concrete tower and wall-supporting wall composite section hybrid tower under ultimate load condition is given.The shear structural measures and bearing capacity results of horizontal splicing joints of H140/C80 prestressed reinforced concrete tower and H140/UHPC prestressed non-reinforced tower were compared and analyzed,and suggestions were put forward for engineering application.3.Combined with the existing norms,according to the theoretical derivation,the bending calculation formula of prestressed UHPC non-reinforced ring tower and UHPC ribbed circular section tower is given.On this basis,the overall finite element analysis of the tower is carried out,and the influence of reinforcement,different UHPC grades and different wall thickness on the principal stress at each elevation of the tower is given.The suggestions of UHPC tower in practical engineering application are given. |
PDF Full Text Request