撐拉過大 的英文怎麼說
中文拼音 [chēnglāguòdà]
撐拉過大
英文
stretched-
Even if oil production peaks soon ? a debatable contention given canada ' s oil sands, venezuela ' s heavy oil and other reserves ? coal and its derivatives could tide the earth over for more than a century
即使石油產量在短期內到達極限（若從加拿大的油砂、委內瑞拉的重油及其他儲存能源來看，這項看法仍有爭議） ，煤及其衍生物應該可以幫助地球至少再撐過一世紀。It is well known that additional stretching of the material in the unsupported wall area may prevent wrinkling, and this can be achieved in practice by increasing the blank - holder force ; but the application of excessive tensile stresses leads to failure by tearing
我們知道在不被支撐的拉伸壁區域中材料的外力拉伸可以防止起皺，這可以在實踐中通過增加壓邊力而實現，但是運用過大的拉伸力會引起破裂失效。Then we also study the effect of string on the dynamical characteristic under the symmetric load and not under the symmetric load as the prestressing is the key making beam string structure the balanceatie system, having large rigidity and embodying the superiority of dynamical characteristic of this structure, this paper studies and conceives how to deteimine the number of the prestressing in each stage of construction and through comparing between the plan of onetime and repeated pulling construction choose the suitable pulling construction plan
並且本文還研究了在對稱荷載和不對稱荷載兩種工況下，結構的受力性能隨豎向撐桿數目、結構垂跨比以及下弦索預應力等參數改變時的變化情況，總結出該結構受力方面的特徵，為實際工程設計提供依據。鑒于預應力是使張弦梁結構形成自平衡體系、具備較大剛度和體現結構性能優勢的關鍵，本文研究和探討了結構施工各階段該預應力大小的確定方法，通過一次張拉與二次張拉方案各項指標的比較，選擇適當的預應力張拉施工方案。
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