cantilever bridges 中文意思是什麼
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Practical method for calculating equivalent wind loads on double cantilever bridges
等長雙懸臂梁等效風荷載實用計算方法 -
By contrasting curved bridge and straight bridge, influence of dead load and prestressing force on the stress in cantilever casting period of curved bridges is analyzed. in this paper, the controlling problem in construction phase is specially studied
通過曲線箱梁橋與直線箱梁橋的對比，模擬計算並著重分析了施工階段自重、預應力等因素對曲線箱梁橋懸澆時應力的影響。 -
The pc rigid frame bridge can meet with the carrying capacity of long span bridge. this kind of structure is fit for the comfortable steer with no other expansion joints except for those at the two ends. it characterized the wholeness of structure, good astigmatic ability and load - bearing ability, construction rapidness, bright and pithiness bridge style, easy to maintain and convenient for segmental construction using the cantilever technique, so rigid frame bridge have taken an increasingly great proportion in bridges constructed and those under construction at city and county
剛構橋能滿足特大跨徑橋梁的受力要求，除兩端以外無其他伸縮縫，有利於行車平順舒適，具有結構整體性能好、抗震能力強、承載能力強、施工快捷、橋體簡潔明快、維護方便和便於懸臂施工等結構特點，因而在城鄉已建和在建的橋梁中占據了越來越大的比重。 -
According to the design theory of the cable - stayed bridge and to the feature of the cantilever construction the authors propose a construction control method called optimum completion state method ( ocsm ) for rc cable - stayed bridges in the proposed method, the optimum completion state is regarded as the final target of the construction control, and the optimum construction state at each construction stage is taken as the technical route the key of the method is to properly choose or adjust the cable forces the objectives function of optimization is to minimize the elevation error of the girder under the constraint condition that the internal forces ( bending moments ) of the girder are bounded the optimization variables are the cable forces on the basis of the above principles, a optimum model for a construction step is established and cable force adjustments can be found for each construction step in this model, the creep and shrinkage effects of concrete have been considered a bridge example is given which shows that the final state of the bridge is very close to the design aim and that this method is much better than the so - called double - control method the example is a good illustration of the soundness and practical value of the proposed method
根據現代斜拉橋結構設計理論和懸臂施工方法的特點，提出了以最佳成橋狀態作為施工控制的最終目標，以實施最佳施工階段為技術路線，以索力調整為核心內容的斜拉橋施工控制理論，簡稱為最佳成橋狀態法；以斜拉橋主梁標高誤差最小為目標函數，以主梁內力（彎矩）為約束條件，以索力為優化變量，建立了最佳施工階段的索力調整計算模型；推導了考慮徐變收縮效應的索力調整計算公式；用最佳成橋狀態法對一實橋工程進行了施工控制全過程計算研究，得到的成橋狀態與設計目標相當接近，優于該橋以「雙控」為控制目標的實測結果，有力地證明了本文方法的正確性及其工程實際價值 -
In this paper the author first analysed the wind effects on bridges, and wind - induced vibration is described in particular. second, two methods for wind effects on bridges are discussed, which include the method of gust response factors and the method of buffeting response spectrum. thirdly, from the requirement of practical engineering, the accurate analysis method is simplified according through the parametric analysis, the formula for engineering application of the second method is presented. finally, a realengineering example illustrate the usage of the two methods. and the result of the engineering example show that the stress calculated by buffeting response spectrum method is larger than which calculated from the gust response factor methed, also the temporary method of wind resistant ways for bridge in cantilever state is presented
第二，分析了橋梁抗風分析的兩種方法，包括基於陣風系數的陣風分析法和抖振反應譜分析法。第三，從工程實際應用出發，通過參數分析，對精確方法進行適當簡化，推導出了橋梁在懸臂施工中的抖振反應譜法的實用計算公式。最後，通過工程實例，採用兩種抗風分析方法分別進行了分析計算，實例分析的計算結果說明反應譜法計算得到的內力大於按陣風系數法得到的內力；同時提出了在懸臂施工狀態工程施工中的臨時抗風措施。 -
Self - erection system is applied to construction of most of modern large span concrete bridges. in the process of construction, cantilever beam is changing continuously because of the gravity of concrete, the stretching force, the load and temperature variation etc. in order to ensure that two cantilevers constructing opposite can normally close up and that the bridge linearity can accord with design, flexibility deformation has to be monitored
現代大跨度混凝土橋梁多採用自架設體系施工，在混凝土自重、張拉力、橋面荷載、溫度變化等的作用下，懸臂梁體處于不斷的變化之中，為保證對向施工的兩端懸臂能正常合攏和控製成橋線形符合設計要求，需要對施工過程中的撓度變形進行監測。 -
This paper conducts a study of nonlinear stability behavior of a long - span prestressed concrete rigid - frame bridge at cantilever construction stage respectively by means of buckling, collapse theories and 3d nonlinear digital models, discusses the stability characteristics of other similar bridges at the same construction stage, and also generalizes some helpful conclusions
摘要分別採用屈曲理論和壓潰理論，利用三維非線性數字模型，研究了懸臂施工階段大跨度預應力混凝土剛構橋的非線性穩定行為，探討了同類橋梁懸臂施工階段的穩定性，得出了一些有益的結論。
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