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Lateral stability of prestressed precast concrete girders during lifting: study case

機(jī)譯：預(yù)應(yīng)力預(yù)制混凝土梁在吊裝過程中的橫向穩(wěn)定性研究案例

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Improvements in concrete technology, reinforcing systems and manufacturing processes enable the use of increasingly long reinforced precast concrete girders, contributing to the competitiveness of girders in concrete in comparison with other alternatives. The weight of the girders should be limited however, in order to achieve an optimum between span length and lifting and transportations costs. The current tendency in design is to minimize the width of the flanges, thus the girder becoming more flexible laterally and more prone to suffer instability phenomena during transient loading situations. An increasing number of accidents and damages associated with this instability problem are reported in the technical literature (e.g., Hurff 2010; Rose 2013). The main objective of this study is to describe a real case of lateral instability of a long prestressed concrete bridge girder during lifting as well asto perform a parametric study to understand the limits of the problem observed. Special attention is paid to the evaluation of the provisions gathered in the Model Code 2010 (MC - 2010) regarding the lateral stability, since these might not be sufficient to cover limit cases.
機(jī)譯：混凝土技術(shù)，加固系統(tǒng)和制造工藝的改進(jìn)使得可以使用越來越長(zhǎng)的增強(qiáng)型預(yù)制混凝土梁，與其他替代方案相比，可提高梁在混凝土中的競(jìng)爭(zhēng)力。然而，應(yīng)限制大梁的重量，以便在跨度長(zhǎng)度與起重和運(yùn)輸成本之間達(dá)到最佳。設(shè)計(jì)中的當(dāng)前趨勢(shì)是使凸緣的寬度最小化，從而使梁在側(cè)向變得更加柔韌性，并且在瞬態(tài)載荷情況下更易于遭受不穩(wěn)定性現(xiàn)象的影響。在技??術(shù)文獻(xiàn)中，與這種不穩(wěn)定性問題相關(guān)的事故和破壞的數(shù)量不斷增加（例如，Hurff，2010年; Rose，2013年）。這項(xiàng)研究的主要目的是描述一個(gè)長(zhǎng)的預(yù)應(yīng)力混凝土橋梁在提升過程中側(cè)向失穩(wěn)的真實(shí)情況，以及進(jìn)行參數(shù)研究以了解所觀察到的問題的局限性。特別要注意對(duì)《標(biāo)準(zhǔn)法規(guī)2010》（MC-2010）中有關(guān)橫向穩(wěn)定性的規(guī)定進(jìn)行評(píng)估，因?yàn)檫@些規(guī)定可能不足以涵蓋極限情況。

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