考慮溫度影響的鋼筋混凝土結構施工過程安全分析與計算機實現(xiàn)
本文選題:鋼筋混凝土結構 + 施工期; 參考:《上海交通大學》2014年博士論文
【摘要】:鋼筋混凝土結構在施工階段實際上是一個部分完成的結構和模板支撐系統(tǒng)構成的“時變結構”。經驗表明,隨著模板支撐系統(tǒng)的撤換這種結構很可能出現(xiàn)在整個“生命周期”中最不安全的受力狀態(tài),從而引發(fā)事故。為了控制這種事故的發(fā)生,自上個世紀60年代開始國內外做了大量的研究,探索了一些便于施工安全控制的簡明的計算方法。美國學者P. Grundy和A. Kabaila提出了簡化手算結構分析方法,此后,我國學者劉西拉教授于1985年建立了施工期結構分析的三維有限元法——精化方法。簡化方法和精化方法是鋼筋混凝土結構施工期荷載傳遞研究中的兩個里程碑式的計算模型。 隨著現(xiàn)代施工技術的不斷提高,鋼支撐在鋼筋混凝土結構施工中逐漸取代了木支撐得到了越來越廣泛的使用。而一些實測研究表明,鋼支撐在晝夜溫差作用下熱脹冷縮對施工期結構荷載傳遞的影響不能被忽略。 為了研究溫差對施工期鋼筋混凝土結構荷載傳遞的影響規(guī)律,本文作了如下研究工作。 首先,在結構模型方面,本文在國內外相關研究的基礎上,增加考慮施工日夜環(huán)境溫差的影響,統(tǒng)一了現(xiàn)有的鋼筋混凝土框架,板柱和墻板結構在施工期的結構模型和分析方法,模型考慮了混凝土強度和彈性模量隨齡期增長的影響。接著本文使用二維非穩(wěn)態(tài)熱傳導方程建立了晝夜溫差和鋼支撐同混凝土結構柱子之間的溫差的相互關系,并據(jù)此將溫度的影響以廣義的荷載添加到結構中。同時,本文還在模型中考慮了鋼支撐上下木墊塊引起支撐整體抗壓剛度的影響。 其次,本文根據(jù)前面的結構模型和溫度模型編制了相應的“考慮溫度影響的施工過程安全分析”(Safety Analysis during Construction consideringTemperature,SACT)應用軟件。SACT能運行于windows2000,window XP,windows7等多個操作系統(tǒng),可使用Excel2000,Excel2003,Excel2007,Excel2010等多個版本進行數(shù)據(jù)輸入和輸出。SACT采用MFC(Microsoft FoundationClasses)應用程序框架編寫圖形界面,能進行施工操作的逐步模擬和計算。SACT軟件在編制過程中體現(xiàn)了模型中所考慮的溫差以及鋼支撐上下木墊塊對施工期荷載傳遞的影響。通過同現(xiàn)場實測數(shù)據(jù)的比較驗證了SACT計算結果的準確性和適用性。 此外,文章還討論了溫差大小對施工期荷載傳遞的影響,揭示了不同晝夜溫差影響下的鋼筋混凝土結構施工期荷載傳遞規(guī)律,,并建議了臨界溫差值,當晝夜溫差大與臨界溫差時,溫差對荷載傳遞的影響不應被忽略。 最后,本論文還分析討論了在溫度影響下施工周期,鋼支撐層數(shù)以及支撐剛度(木墊塊厚度)對施工期混凝土結構荷載傳遞的影響,分析并得出了一些相關規(guī)律,提出了提高施工安全性的一些改進措施。這些結論對現(xiàn)場施工人員有一定的借鑒意義。
[Abstract]:In order to control the occurrence of the accident , a great deal of research has been done at home and abroad since the 1960s . Grundy鍜孉. Kabaila proposed a simplified method for the analysis of the structure of the hand . After that , Professor Liu Sira , a scholar from our country , established a three - dimensional finite element method for the structural analysis of the construction period in 1985 . The simplified method and the refinement method are two landmark calculation models in the study of load transfer in the construction period of reinforced concrete structures .
With the continuous improvement of modern construction technology , the steel support has been widely used in the construction of reinforced concrete structure .
In order to study the influence of temperature difference on the load transfer of reinforced concrete structure during construction period , the following research work is done .
First , on the basis of the structure model , this paper , based on the relevant research at home and abroad , increases the influence of the temperature difference of the construction day and night , unifies the structure model and analysis method of the existing reinforced concrete frame , plate column and wallboard structure in the construction period , considers the relation between the temperature difference of the day and night and the temperature difference between the steel support and the column of the concrete structure , and then adds the influence of temperature to the structure with the generalized load .
In this paper , the application software of Safety Analysis during Construction Process Temperature ( SACT ) is compiled according to the previous structural model and temperature model . The SACT can be run in windows 2000 , windows XP , windows 7 , etc .
In addition , the influence of temperature difference on load transfer in construction period is discussed , and the load transfer law of reinforced concrete structure under different day and night temperature difference is revealed , and the critical temperature difference is suggested . When the temperature difference between day and night is large and the critical temperature difference is large , the influence of temperature difference on load transmission should not be ignored .
Finally , this paper also analyzes the influence of the construction period , the number of steel support layers and the supporting rigidity ( wood block thickness ) on the load transmission of the concrete structure during the construction period under the influence of temperature , analyzes and obtains some relevant laws , and puts forward some improvement measures to improve the construction safety .
【學位授予單位】:上海交通大學
【學位級別】:博士
【學位授予年份】:2014
【分類號】:TU755
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