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System Reliability Analysis of Half-through Concrete-filled Steel Tubular Arch Bridge Based on Optimization Technique
| Content Provider | Semantic Scholar |
|---|---|
| Author | Jing, Lv |
| Copyright Year | 2016 |
| Abstract | The object of this paper analyzes the reliability of half-through concrete-filled steel tubular arch bridges. Load and resistance parameters are treated as random variables. The statistical parameters are based on the available literature, test data and survey results. Reliability indices of main components of the bridge structure are calculated by iterations using the first-order second-moment method. The half-through concrete-filled steel tubular arch bridge is the typical series system and the reliability index of the system is calculated by the optimization technique. The study shows that the optimization technique has a good application to example bridge which meet the requirement of ductile index. Introduction In early 1937, concrete-filled steel tubes were used extensively to make arch bridges in the former USSR. The arch bridge with a span of 101 m across the Neva River is one example of such a bridge. The first CFST arch bridge in China was completed in 1990. It is the Wanchang Bridge with a main span of 110 m. Subsequently, more than two hundred CFST arch bridges have been built or are under construction in China. The half-through arch bridge is the most popular type of CFST arch bridge in China. Half-through arch bridges are constructed with the deck at some intermediate elevation between the springing and the crown. Yajisha Bridge (360m) in Guangdong Province, Maochaojie Bridge (368 m) in Hunan Province, and Wuxia Yangtse River Bridge (460 m) in Chongqin are examples of half-through arch bridges [1]. On the basis of the cross-section, CFST arch ribs may be divided into single-tube-type ones, dumbbell-type ones, and space trusses with three to six tubes, etc. The rib diameter ranges from 450 to 2000 mm, and the height varies from 1200 to 9000 mm. Similarly, the thickness of the steel tubes ranges from 8 to 20 mm. In general, the span of this kind of arch bridge ranges from 80 to 460 m—similar to those of steel arch bridges, but larger than those of concrete arch bridges. The deterministic analysis of stone and steel arch bridges have been studied in detail in the literature [2-7], but studies of CFST arch bridges have rarely been reported. This study focuses on analyzing the reliability of half-through concrete filled steel tubular arch bridge during the service stage. Bridge description The Jiantiao Bridge is a concrete-filled steel tubular half-through arch bridge. It is located at Sanmen City and the span of the bridge is 245 m. The elevation of the bridge is shown in Fig. 1. The superstructure of the bridge consists of a vertical load bearing system, a lateral bracing configuration, and a floor system. The cross-section of the two main arch ribs comprises four concrete-filled tubes, with the dimensions of 800 14 mm. The depth of the main arch rib is 4400 mm. There are 120 main suspenders, steel wire ropes, that are vertically attached on the main arch rib and the floor system is suspended through these. Each of these ropes consists of 61 smaller bars each with a diameter of 5.5mm. The floor system consists of a 250 mm thick concrete slab supported directly by cross-girders International Symposium on Mechanical Engineering and Material Science (ISMEMS 2016) Copyright © 2016, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Advances in Engineering Research, volume 93 |
| File Format | PDF HTM / HTML |
| DOI | 10.2991/ismems-16.2016.36 |
| Alternate Webpage(s) | https://download.atlantis-press.com/article/25866966.pdf |
| Alternate Webpage(s) | https://doi.org/10.2991/ismems-16.2016.36 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
