To discuss the structure design and optimization of building curtain wall, the dynamic characteristics of point supported glass curtain wall system are analyzed by the finite element method. The various Building Curtain Wall technologies are made use of, and according to the characteristics of the structure system, the finite element analysis model with steel structure glass plate beam element and shell element as the basic elements is established. Then, the dynamic characteristics are analyzed, and the modal parameters such as inherent frequency and vibration type are identified. The research results show that the node displacement response power spectrum under the load of wind is obtained, which provides the basis for rationally optimizing the structure. Based on the above findings, it is concluded that the optimization design based on finite element model has a wide significance, which is a useful attempt to reduce the blindness of design and has great engineering significance and application value.

The characteristics of point supported glass curtain wall in glass curtain wall is that it has high permeability, and the supporting structure is concise and lively, which shows the melody beauty of point connecting structure and modern sense of glass support structure system. With the progress of glass technology and a large number of public building construction, point supported glass curtain wall is more and more widely applied at home and abroad [1] . Because the supporting structure of point supported glass curtain wall is expanding constantly, the lattice steel structure can well meet the above requirements, and it has been widely used in the supporting structure of point supported glass curtain wall. In order to give a different hue to a building under different external light conditions and show dynamic beauty of buildings, it requires to re-design and optimize the building curtain wall structure. What’s more, in the development of building curtain wall, some problems appeared, which seriously affect the prospect of building curtain wall. For solving these problems and promoting the further development of it, it is necessary to make an optimization. With the use of CAE technology, according to the characteristics of the system of point supported glass curtain wall structure, finite element analysis model with steel structure glass plate beam element and shell element as the basic elements is established, the connection between the structure and boundary conditions is rationally simulated, and the modal analysis is carried out, to identify the modal parameters. According to the design schemes, the dynamic characteristics are completely analyzed and compared. In addition, calculation of dynamic sensiti- vity based on finite element analysis is carried out. And the point supported glass curtain wall structure system is divided into several components according to the actual situation, with each component as a group. Through the numerical analysis software, corresponding program is compiled, and dynamic sensitivity is calculated by using difference method. On the basis of dynamic sensitivity analysis, the dynamic modification research on point supported glass curtain wall system is carried out, and the effective design variables are selected to optimize the dynamic design, and the corresponding conclusions are obtained.