The Influence Of Joint Stiffness On Wind-induced Vibration Of Kiewitt Single-layer Spherical Reticulated Shell Structures

The quick improvement of the spatial steel structure’ technical level and the growing people’s demand for large space public buildings, which makes the large span space structure has become a new hot spot in the field of construction in our country. Reticulated shell structure is especially favored by people because of its reasonable stress, big span, beautiful shape and so on. But reticulated shells have disadvantages of weight light, small stiffness, wind area, it is a structure which is sensitive to the wind load, in some regions where there is a strong wind, the wind load even more than earthquake loads, it may be control load in the structural design, So the research of the wind resistance performance of the reticulated shells has very important practical significance. At present, there are many scholars engaged in the research of wind resistance of reticulated shell structures and have achieved a series of important achievements. The main purpose of this paper is studing on the effect of joint stiffness on the wind resistance performance of lattice shell structures, hoping to be helpful for wind resistance research of shell structure. The main conclusions are as follows:(1) The development and application of large span spatial structure and the present situation of wind resistance research of reticulated shell structures is summarized by reading relevant books, periodicals and papers.(2) This paper introduces the theory and method of numerical simulation of wind load, and fluctuated wind speed of the proposed analysis model of is simulated by using autoregressive filter method(AR) and matlab program is compiled by ourself. Meanwhile the wind speed can be converted to the wind load time history which act on the shell structure according to the relevant calculation formula.(3) The effect of the different support joint stiffness on the Kewitte single- layer spherical reticulated shell structure wind shock response is studied through the modal ana lysis and time history analysis. The study shows that the bending stiffness of support node have little impact on wind- induced vibration of reticulated shell structure; Reduce the amount of support lead to wind- induced vibration increased in the surrounding area; Elastic support can increases wind- induced vibration obviously.So this paper put forward the arc length about arrangement of bearing and support node stiffness to provide the reference for reticulated shell structure of the design.(4) This paper design different control node stiffness on the base of computational rigidity of welded hollow sphere, the input of the node stiffness in the mode is achieved by using Short rod model,finally the influence of different joint stiffness on the Kewitte single- layer spherical reticulated shell structure wind-induced response is studied by modal analysis and time history analysis. The study shows that the welded ball joints of the different sizes accord with the design specifications has little effect on the response of Reticulated Shell Wind and with the decrease of the joint stiffness, the wind- induced vibration response of the spherical reticulated shell is increasing. So this paper put forward the node control stiffness to provide the reference for reticulated she ll structure of the design.