Study On The Structural Performance Of Perfobond Strip Connection For Pretressed Concrete-Steel Hybrid Wind Turbine Tower

As the energy and environment problems become more and more serious, many goverments and research institutions have paid more attention to the development of wind power because it is green and reproductable. Currently, because of the increasing capacity of wind power generators and the increseasing he ight of towers, the problems including the traditional steel towers’ big diameter, transportation difficulties and low efficiency are increasingly prominent. The prestressed concrete-steel hybrid wind turbine tower is an efficient new structure system to solve these problems. In order to make integrate the steel and concrete segments to ensure the safety and reliability of the structure’s stiffness mutation point, the structural design and stress analysis of the connection part of the concrete-steel connection of the hybrid tower are very important. At present, available study on the design of the connection of the hybird tower are very limite d. In this thesis, a perfobond strip connection method and its mechanism for prestressed concrete-steel hybrid wind turbine tower are studied with finite element method and scale model test on the baisic structural unit. This thesis includes the following five parts:1. Based on the disadvantages of traditional flange connection, the structural details of the perfobond strip connection of the hybrid tower are given and the bearing capacity of the connection is calculated.2. Taking the designed perfobond strip connection as the model sample, the elastic and elasto-plastic analysis are carried out with the finite element analysis software ABAQUS using plastic damage constitutive law of concrete. According to the analysis, the stress of the concrete and the steel part of the connetion and the deformation of the strip which is the critical component of the perfobond strip connection are analyzed.3. A scale model test is carried out to analyse the intergrity and local stress performances of the scaled connection after the reasonable simplification of the perfobond strip connection. The test results verified the loading-carrying of the connection.4. The results of the numerical simulation of the test members are compared with that of the scale model test data. The safety and reliability of the perfobond strip connection are proved through the results of the mumerical simulati on and model test. The directions of research in this area are introduced.