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将索桁架和斜拉结构进行组合,构造一种新型索结构体系,即斜拉型悬索结构。张拉背索对结构施加预应力,通过找力和找形得到了结构的初始预应力态,在此基础上进行了结构在满跨和半跨均布荷载作用下的静力、动力特性研究及参数分析,并对该新型索结构体系进行了风振响应计算。研究表明:结构静力荷载-位移关系呈非线性双折线,结构刚度的转折点对应于稳定索边段的退拉松弛;结构的低阶振型表现为桅杆的水平振动叠加屋盖的竖向振动,高阶振型中桅杆水平方向参与很少;增大背索截面面积可有效提高结构刚度和自振频率,稳定索、斜拉索面积对自振频率影响不大;背索预应力值对结构的静力特性影响是线性的,在所有索段具有拉应力时,预应力值对结构动力特性基本无影响,若索出现松弛则结构刚度急剧退化,自振频率陡降;桅杆高度增大,结构刚度下降,桅杆高度对结构的低阶振型和频率影响较大;矢跨比对屋盖竖向对称振动的第2振型有影响,而对反对称的第1振型基本无影响;斜拉型悬索结构的风振系数介于1～2之间。
The cable trusses and the cable-stayed structure are combined to construct a new cable structure system, namely the cable-stayed suspension structure. Tensile backstroke prestressed the structure, obtained the initial prestressing state of the structure by looking for force and finding the shape, and studied the static and dynamic characteristics of the structure under the condition of full-span and half-span uniform load And parameter analysis, and the wind-induced vibration response of the new cable structural system was calculated. The results show that the static load-displacement relationship of the structure shows a nonlinear double-folding line, and the turning point of the structural stiffness corresponds to the relaxation and relaxation of the edge of the stabilized cable. The low-order vibration modes of the structure are the horizontal vibration of the mast and the vertical vibration of the roof , The mast in the high-order vibration mode has little involvement in the horizontal direction; increasing the cross-sectional area of the backstay can effectively increase the structural stiffness and natural frequency; the area of stable cable and diagonal cable has little effect on the natural frequency; When all of the cable sections have tensile stress, the prestress value has no effect on the dynamic characteristics of the structure. If the cable is loosened, the structural stiffness will degenerate sharply and the natural frequency will drop sharply. The height of the mast will increase, The stiffness decreases, the height of the mast has a significant effect on the low-order vibration mode and frequency of the structure; the sag-span ratio has an effect on the second mode of vertical symmetric vibration of the roof, but has no effect on the first mode of anti-symmetry; Wind-induced suspension cable structure of the vibration coefficient between 1 ~ 2.