Geometrical nonlinearities on the static analysis of highly flexible steel cable-stayed bridges

The bridge is a hybrid cable-stayed structure (Figure 2). The 800 m main span is a steel-truss deck and the side spans are twin-box concrete girders 27·7 m wide and 8·2 m deep. The pylons are 'H' shaped with heights of 243 m and 258 m on the Guiyang and Qianxi sides, respectively. IntroductionYachihe Bridge has set a new record as the world's longest steeltruss cable-stayed bridge (Figure 1) Yachihe Bridge in China is the longest steel-truss, cable-stayed bridge in the world and the tenth longest overall. Completed in 2016, its 800 m main span carries the new Guiyang-Qianxi dual carriageway over the Yachihe River gorge. It is also the first cable-stayed bridge to be erected using a cable crane, and its concrete-box-girder side spans feature the first use of cable anchorages in the middle of the outer web. Furthermore, geometry alignment during deck closure was achieved by adjusting cable forces rather than by using counterweights. This paper describes the configuration and numerical analysis of the innovative cable anchorage, discusses the challenges and solutions involved in using a cable crane for construction and details the novel closure techniques adopted for the steel-truss deck. Proceedings of the Institution of Civil EngineersCivil Engineering 171 February 2018

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“…As such they are much more flexible than conventional continuous bridges, especially for long-span cable-stayed bridges (Freire et al, 2006).…”

Section: New Closure Techniquesmentioning

confidence: 99%

Yachihe Bridge, China: engineering the world’s longest cable-stayed steel truss

YuXiangmin

ChenDewei

XueMenggui

2018

Proceedings of the Institution of Civil Engineers - Civil Engin

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“…The equivalent stiffness of cable elements decreases with the increase of sag and eventually leads to a reduction of load-carrying efficiency of stay cables (Freire et al, 2006). The cable sag effect, commonly referred to as the ratio of the axial deformation δ to the chord length L c of cable elements (Gimsing, 1997), must be taken into account, especially in the analysis of long-span cable-stayed bridges.…”

Section: Cable Sag Effectmentioning

confidence: 99%

“…Using the four analytical models, seven mechanical parameters (see Table 2) were investigated in detail one by one by varying the variable ρ from 0% to 100%. These seven mechanical parameters can comprehensively describe the characteristics of cable elements, and all of them are the key study objectives for the cable-related research (Irvine, 1981;Ahmadi-Kashani and Bell, 1988;O'Brien and Francis, 1964;Freire et al, 2006;Gimsing, 1997). All the equation numbers used to solve the seven investigated mechanical parameters are also listed in Table 2.…”

Section: Analytical Models Of Stay Cablesmentioning

confidence: 99%

Concept and analysis of stay cables with a CFRP and steel composite section

Xiong

Cai

Xiao

et al. 2012

KSCE Journal of Civil Engineering

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This paper describes the concept of a novel stay cable with a Carbon Fiber Reinforced Plastic (CFRP) and steel composite section. In this concept CFRP core conserves all the advantages of CFRP materials such as light weight and high strength, while steel coat provides protection for the CFRP core and ensures reliable anchorage performance. The steel coat can reduce cost and provide higher stiffness than CFRP materials in some length range. Following this concept, several configurations were proposed for the composite structure. Effects of the key design parameter of the proposed stay cables, namely the ratio of the CFRP section area to the whole section area, were examined through a parametric study using analytical solutions. By doing this, an appropriate range of the ρ value was suggested. Factors that can affect the appropriate range of the ρ value, including the horizontal projected length of stay cables, cable force, and pylon height (i.e., vertically projected length of stay cables), were also studied. Finally, the feasibility of the proposed stay cables was conceptually verified. It was shown that the proposed stay cables could be an excellent alternative to the pure CFRP or traditional steel stay cables.

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“…The structural analysis of cable-stayed bridges considering the geometrical nonlinear effects was presented in [19][20][21][22][23][24][25] and the authors refer the importance of taking into account these effects for an adequate analysis of this type of structure.…”

Section: Introductionmentioning

confidence: 99%