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標題: | 波型鋼腹板懸臂橋預拱值管理 The Management of Pre-camber for Free Cantilever Corrugated Steel Web Bridge |
作者: | Sheng-Yi Chung 鍾聖懿 |
指導教授: | 曾惠斌(Hui-Ping Tserng) |
關鍵字: | 波型鋼腹板懸臂橋,預拱值,拱度差異量, Free cantilever corrugated steel web bridge,Pre-camber,Camber difference, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 波型鋼腹板懸臂橋因箱形梁腹板以波型鋼板取代,較傳統場鑄懸臂橋有高強度、低重量、跨徑大之特性,故在混凝土或鋼材使用量均有顯著的降低,且可配合地形、路線需求適用於各種橋梁線型設計。
本研究之個案以國內第一座波型鋼腹板懸臂橋為例,為全世界梁深最深的波型鋼腹板懸臂橋,鋼板高度達7.3公尺,波型鋼板壓製設備因應波型鋼板長度需求於國內重新設計製造;由於國內法規之規定及限制,波型鋼腹板頂版接合方式之設計與日本設計不同,因頂版木模現場裁切精度不佳與波型鋼板間隙難以克服,造成漏漿及施工效率不佳問題,經不斷修正以鋼版前端搭配橡膠與泡棉,方得以解決問題。 懸臂橋梁施工中預拱值控制及管理涉及將來橋形及節塊閉合,為施工中相當重要課題,若預拱值之管理控制不當,導致橋梁閉合時懸臂閉合節塊高程落差過大,需對完成之節塊施以額外之加載,以達到閉合的目的,將使結構增加額外應力,又或使橋梁線形不平順,影響完成橋面行車舒適性,為使行車平順,需調整AC鋪築厚度,亦會增加橋梁額外載重及增加施工成本。 本研究當施工監測拱度差異量上下限值超過±25MM,且經拱度差異量識別無其它異常情形,則將差異量之一半值視為後續各節塊除理論值外之調整值;預測閉合誤差時機為當節塊進行至1/2長度,則進行懸臂閉合節塊之拱度差異量預測,拱度差異量預測採複迴歸分析,選定之變數分別為節塊至柱中心距離及每塊懸臂節塊之波型鋼腹板重量,以作為未來其他類似工程節塊閉合之參考。 Free cantilever corrugated steel web bridge due to steel plates substitute for concrete structure, more traditional cantilever bridge has high strength, low weight, large span, so there is significant reduction in the use of concrete or steel volume, And can meet the terrain, route requirements for a variety of bridge line design In this case, it’s the Taiwan's first free cantilever corrugated web bridge and also the deepest free cantilever corrugated web bridge in the world. The height of the steel plate is 7.3 meters. To meet the requirements of the steel plate length, the equipment which produces corrugated steel plate was redesigned and manufactured in Taiwan. Since Taiwan regulation limitation, the corrugated steel plate and top slab form jointing method is different from the Japanese design. Because wood form site cutting precision is not good, the gap between form and corrugated steel plate is hard to overcome, resulting in leakage of cement and construction efficiency is not good. The problem had solved till the front of the steel plate with rubber and foam. The controlling and management of pre-cambers in the construction of cantilever bridges effect the future bridge shape and segmental closures. It is a very important issue during construction. If the management of pre-cambers is not properly controlled, the elevations of the cantilever-closure segments will be too large when the bridge is closed. The bridge are subjected to additional loads to achieve the purpose of closure, or make the bridge line irregular that affect the comfort of traffic. To make the traffic smooth adjust the AC paving thickness will increase the extra load on the bridge and increase the construction cost. In this study, when the upper and lower limit values of the construction monitoring difference exceeds ±25 MM, and there is no other problem, one half of the variance is regarded as the adjustment value of the following segments except the theoretical value. The prediction of camber difference is when the segment is 1/2 span, then the cantilever closure segment is predicted for the camber difference, and the variation is predicted by the regression analysis. The selected variables are the segment to column center distance and each weight of the steel plate of the segment. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/69374 |
DOI: | 10.6342/NTU201801419 |
全文授權: | 有償授權 |
顯示於系所單位: | 土木工程學系 |
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