基于可靠度的柔性系桿更換研究
發(fā)布時(shí)間：2019-06-13 10:09
【摘要】：柔性系桿作為系桿拱橋的關(guān)鍵構(gòu)造,其索力損失必然對(duì)橋梁的可靠性能造成重要影響,索力損失到一定程度需及時(shí)進(jìn)行更換。依托某跨徑跨布置為46 m+202 m+46 m柔性系桿飛燕式鋼管混凝土拱橋,以系桿索力損失10%為初始狀態(tài),提出4種系桿更換方案(單側(cè)同時(shí)更換1根、2根、3根、4根,上下游側(cè)同時(shí)進(jìn)行更換),采用一次二階矩(JC)法及PNET法,分析了不同方案下橋梁構(gòu)件及體系的可靠度變化規(guī)律。結(jié)果表明:方案1、2均可行,方案1安全但施工步驟多,方案2能夠保證橋梁的最低安全等級(jí),同時(shí)盡可能縮短施工時(shí)間,建議采用方案2。
[Abstract]:As the key structure of tied arch bridge, the loss of cable force will inevitably have an important impact on the reliable performance of the bridge, and the loss of cable force to a certain extent needs to be replaced in time. Based on the 46 m 202 m 46 m flexible tied steel tube concrete filled steel tubular arch bridge with a span of 46 m 202 m 46 m, four kinds of tie rod replacement schemes (one side, two, three, four, upstream and downstream side replacement) are put forward, and the reliability variation law of bridge components and systems under different schemes is analyzed by using the first order second moment (JC) method and PNET method. The results show that scheme 1 and 2 are feasible, scheme 1 is safe but the construction steps are many, scheme 2 can ensure the minimum safety level of the bridge, and shorten the construction time as much as possible. It is suggested that scheme 2 should be adopted.
【作者單位】： 中交路橋技術(shù)有限公司;北京中交華聯(lián)科技發(fā)展有限公司;重慶交通大學(xué)土木建筑學(xué)院;山區(qū)橋梁與隧道工程國家重點(diǎn)實(shí)驗(yàn)室培育基地;
【基金】：科技部973計(jì)劃(國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目2012CB723300)
【分類號(hào)】：U445.7
[Abstract]:As the key structure of tied arch bridge, the loss of cable force will inevitably have an important impact on the reliable performance of the bridge, and the loss of cable force to a certain extent needs to be replaced in time. Based on the 46 m 202 m 46 m flexible tied steel tube concrete filled steel tubular arch bridge with a span of 46 m 202 m 46 m, four kinds of tie rod replacement schemes (one side, two, three, four, upstream and downstream side replacement) are put forward, and the reliability variation law of bridge components and systems under different schemes is analyzed by using the first order second moment (JC) method and PNET method. The results show that scheme 1 and 2 are feasible, scheme 1 is safe but the construction steps are many, scheme 2 can ensure the minimum safety level of the bridge, and shorten the construction time as much as possible. It is suggested that scheme 2 should be adopted.
【作者單位】： 中交路橋技術(shù)有限公司;北京中交華聯(lián)科技發(fā)展有限公司;重慶交通大學(xué)土木建筑學(xué)院;山區(qū)橋梁與隧道工程國家重點(diǎn)實(shí)驗(yàn)室培育基地;
【基金】：科技部973計(jì)劃(國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目2012CB723300)
【分類號(hào)】：U445.7
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