鋼床鈑鋪面破壞分析及較適鋪面材料之探討

Distress Analysis and Suitable Paving Materials for Pavements on Steel Deck

翁逸偉(Yi-Wei Weng)

指導教授 ： 林志棟 ； 黃偉慶

國立中央大學/工學院/土木工程學系/博士(2011年)

摘要

鋼橋位於交通要道上，常受交通之衝擊，故橋面上鋼床鈑之鋪面必須相應地提供優良的效能，以延長鋪面之使用年限。鋼床鈑鋪面材料之選擇，雖有多種材料選擇及組合方式，惟仍缺最重要的力學分析比較，以找出較適鋪面材料及其組合。本研究由力學計算方法出發，利用有限元素法ABAQUS軟體，在考慮高軸重高胎壓之重車載重下，進行鋼床鈑不同柔性鋪面材料組合之力學反應分析，以瞭解鋼床鈑鋪面破壞之原因，並藉此找出鋼床鈑鋪面配置原則及較適柔性鋪面之材料組合。
結果顯示，鋼床鈑鋪面之疲勞裂縫破壞，最快為載重下方面層底部由下往上之開裂，其次為沿肋梁上方面層表面之縱向開裂；本研究疲勞破壞判斷準則，找出面層內最大張應變，為面層底部之最大主張應變，與傳統疲勞理論相符。車轍破壞以鋼床鈑頂部最大壓應變為判斷準則，車輪載重處之面層受壓應變才是車轍主因。鋼床鈑單層鋪面應以回彈模數大者為優先考量；雙層鋪面以回彈模數大者置於底層，次大者置於面層為較適組合。鋼床鈑單層鋪面較適材料為全斷面GUSS瀝青混凝土；鋼床鈑雙層鋪面較適組合為上層改質瀝青混凝土，下層為GUSS瀝青混凝土。

關鍵字

疲勞破壞 ； GUSS瀝青混凝土 ； 鋼床鈑 ； 車轍破壞

並列摘要

The steel bridges are located on traffic artery, it is usually affected by traffic impact; hence, the pavement of the steel deck on the bridge must provide excellent efficiency to prolong the service life of pavement. This study utilized mechanical calculation method and finite element method ABAQUS software to analyze the mechanical response of different flexible pavement material combinations on steel deck. Heavy vehicle load with high axle load and high tire pressure were considered, so as to know the reasons for steel deck pavement distress, and to define the arrangement principle for steel deck pavement and the combination of materials suitable for flexible pavement.
The results show that the fatigue damage of steel deck pavement coincides with traditional theory, the maximum principal tensile strain at the bottom of surface course is still the determination criterion, As for the priority of two fatigue damage modes of steel deck pavement, the first one was the crack from the bottom up at the bottom of surface course, secondly the longitudinal crack near the top (or including bottom) of surface course on ribs. The maximum compressive strain on the top of steel plate is the determination criterion of rutting damage, the major cause for rut is the surface course under compressive strain in the wheel load position. The suitable material for steel deck one-course pavement is full depth GUSS asphalt concrete; the suitable combination for steel deck two-course pavement is modified asphalt concrete on top and GUSS asphalt concrete at bottom.

並列關鍵字

Steel Deck ； GUSS asphalt concrete ； rutting damage ； fatigue damage

參考文獻

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11.Design Manual for Orthotropic Steel Plate Deck Bridges, American Institute of Steel Construction, 1963.

12.AASHTO ,Standard Specifications for Highway Bridge,17th Edition. American Association of State Highway and Transportation Officials, Washington D.C., 2002.