大跨徑橋梁施工控制溫度荷載4P.pdf

大跨徑橋梁施工控制溫度荷載

針對溫度變化對大跨徑橋梁施工控制的影響，在分析溫度荷載特點的基礎上，根據(jù)變分原
理，研究了變分法確定橋梁結構的某一特定溫度分布，對于結構重要結點的分析，可采用溫度場有
限元分析方法來確定最不利溫度分布，對于結構整體分析問題，可將空間溫度場簡記為工程變量分
離的最不利溫度分布；提出了溫度場分布的簡化處理方法，即實用溫度分布函數(shù)— — 半徑驗半理論
公式；以供橋梁設計和施工控制時參考。

Abstract：The change of tempperature has an influence on construction controlling for long—span
bridge．On the basis of analysing the features of temperature load，a certain temperature
distribution in bridge structure was confirmed with variational principle．As for the analysis of
important joints in structure，F(xiàn)EM of temperature field was utilized to confirm the worst—case of
temperature distribution．As for the analysis of whole structure，the space temperature field can
be simplified as the worst-case of temperature distribution by two—dimension speparation of
variables．A simple meathod was put forward to deal with the temperature distribution，that is the
useful distribution function of temperature，semi—empirical and semi—theoretical formula．These
can give reference to the design and construction of bridge．