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Research on long-term health monitoring and operation evaluation system for long-span self-anchored suspension bridge
Published in Hiroshi Yokota, Dan M. Frangopol, Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations, 2021
Xueshan Liu, Xiaohu Chen, Jianting Zhou, Xiaogang Li
A suspension bridge is a flexible suspension composite bridge structure with the main cable as the main load-bearing component, and its main components include main cable, main tower, saddle, sling, and stiffening girder. Suspension bridges can be divided into anchored suspension bridges and self-anchored suspension bridges. For self-anchored suspension bridges, the anchoring position of the main cable is transferred to the stiffening girder end from the anchor, which can not only reserve the attractive appearance of a suspension bridge but also save anchors with huge construction volume. This method is practical to build suspension bridges under adverse landform or geological conditions and has greatly enriched the application scope of suspension bridges. However, self-anchored suspension bridges are more complicated than traditional anchored suspension bridges in terms of structure stress, construction control, and health monitoring. As design concepts get consistently completed, engineering materials get innovated continuously, and bridge construction technologies constantly get mature, this bridge type will become more competitive in bridge construction and witness significant development.
Final Engineering Design
Published in Connie Kelly Tang, Lei Zhang, Principles and Practices of Transportation Planning and Engineering, 2021
A suspension bridge is a bridge where its deck is suspended by cables and suspenders. The cables are suspended between towers (cable moves freely across a tower) and anchored at each end of the bridge. Vertical suspenders connect the deck below and the cable above. All loads are transformed into tension in these cables. Given the strength of modern materials, particularly the extraordinary tensile strength of steel, the span width of a suspension bridge can be extremely long (Figure 6.6d).
Predictive control using a hybrid data-based artificial neural network model: a case study on the construction of massive concrete structures
Published in Structure and Infrastructure Engineering, 2023
Hangjun Liu, Song Yang, Yuantao He, Mingyang Zhang, Guojun Zhao, Zhensheng Cao, Xin Ruan
The case considered in this study is about a long-span suspension bridge located in Southwestern China, with a total length of 1366 meters. The anchorages are important members in suspension bridges because most of the self-weight and external load of the bridge is finally transferred by the cables to the anchorage systems. Figure 2a shows the elevation diagram of the anchorage foundation. In the construction phase of the anchorage foundation, the method of pouring concrete with layers and blocks is adopted and cooling pipes are embedded in the anchorage foundation to reduce the concrete temperature. Figure 2b presents the pouring concrete with layers and blocks. The study is carried out for the temperature control of the anchorage foundation, which is a typical massive concrete structure. The study aims to demonstrate the effectiveness of the methodology described in this paper.
Reliability of Multicomponent Stress-Strength Model Based on Bivariate Generalized Exponential Distribution
Published in American Journal of Mathematical and Management Sciences, 2023
The model discussed in this work may be applicable to some real life problems. A suspension bridge and a multi-axle trailer construction are two examples which inspired our work. To convey the idea, let us briefly consider these examples. In suspension bridges, the deck is supported by a series of suspender cables hung from the main cables which are attached to towers. Suppose we have a suspension bridge with suspender cables attached to the opposite sides of the deck, where each of the suspenders itself consists of two cables. A suspender cable pair is alive only if at least one of the cable on both sides is lasting. The bridge will only survive if a minimum of k suspender cable pair through the deck are not damaged when subjected to stresses due to external effects such as wind flow, heavy traffic, corrosion, etc. On the other hand, a multi-axle trailer may have either four, six or even more axle lines, with each axle line consisting of multiple wheels. Suppose, each axle-line consists of a pair of wheels on both sides. In this case, an axle-line can be considered as working if at least one of the wheel on each side is operating. Now, we may consider the system will only survive if a minimum of k wheels through the axle-lines are in good conditions when subjected to rough roads and very heavy loads. These problems are in the ralm of multicomponent stress-strength reliability. In these case estimation of the multicomponent reliability can prevent some catastrophic disaster, also may help the safety management and the financial savings.
Main Cable Shape of Short Span in Three-Tower Suspension Bridge
Published in Structural Engineering International, 2022
Zhijian Hu, Yasir Ibrahim Shah, Xiao Li, Jianwei Huang
In general, the span length for suspension bridges is 800 m or even more. However, in the case of the Feng Chu suspension bridge Xian-Yang the span length is less than 400 m which is less than half of the current span length for suspensions bridges in the word; that's why we define it as “short span suspensions bridges” within three towers. The difference is the middle tower; movement at the point can change the shape or balance between the two main spans. Mainly because Feng Chu suspension bridge Xian-Yang is the short span suspension bridge which means self-weight is less. The total percentage of live-load and dead-load is small, the movement of towers can cause relaxation in hangers, and the girder may suffer flexural moments that are not acceptable, which makes it different from conventional suspension.