考虑温度影响的钢筋混凝土结构施工过程安全分析与计算机实现

发布时间：2018-06-25 16:04

本文选题：钢筋混凝土结构 + 施工期　；参考：《上海交通大学》2014年博士论文

【摘要】：钢筋混凝土结构在施工阶段实际上是一个部分完成的结构和模板支撑系统构成的“时变结构”。经验表明，随着模板支撑系统的撤换这种结构很可能出现在整个“生命周期”中最不安全的受力状态，从而引发事故。为了控制这种事故的发生，自上个世纪60年代开始国内外做了大量的研究，探索了一些便于施工安全控制的简明的计算方法。美国学者P. Grundy和A. Kabaila提出了简化手算结构分析方法，此后，我国学者刘西拉教授于1985年建立了施工期结构分析的三维有限元法——精化方法。简化方法和精化方法是钢筋混凝土结构施工期荷载传递研究中的两个里程碑式的计算模型。随着现代施工技术的不断提高，钢支撑在钢筋混凝土结构施工中逐渐取代了木支撑得到了越来越广泛的使用。而一些实测研究表明，钢支撑在昼夜温差作用下热胀冷缩对施工期结构荷载传递的影响不能被忽略。为了研究温差对施工期钢筋混凝土结构荷载传递的影响规律，本文作了如下研究工作。首先，在结构模型方面，本文在国内外相关研究的基础上，增加考虑施工日夜环境温差的影响，统一了现有的钢筋混凝土框架，板柱和墙板结构在施工期的结构模型和分析方法，模型考虑了混凝土强度和弹性模量随龄期增长的影响。接着本文使用二维非稳态热传导方程建立了昼夜温差和钢支撑同混凝土结构柱子之间的温差的相互关系，并据此将温度的影响以广义的荷载添加到结构中。同时，本文还在模型中考虑了钢支撑上下木垫块引起支撑整体抗压刚度的影响。其次，本文根据前面的结构模型和温度模型编制了相应的“考虑温度影响的施工过程安全分析”（Safety Analysis during Construction consideringTemperature，SACT）应用软件。SACT能运行于windows2000，window XP，windows7等多个操作系统，可使用Excel2000，Excel2003，Excel2007，Excel2010等多个版本进行数据输入和输出。SACT采用MFC（Microsoft FoundationClasses）应用程序框架编写图形界面，能进行施工操作的逐步模拟和计算。SACT软件在编制过程中体现了模型中所考虑的温差以及钢支撑上下木垫块对施工期荷载传递的影响。通过同现场实测数据的比较验证了SACT计算结果的准确性和适用性。此外，文章还讨论了温差大小对施工期荷载传递的影响，揭示了不同昼夜温差影响下的钢筋混凝土结构施工期荷载传递规律，，并建议了临界温差值，当昼夜温差大与临界温差时，温差对荷载传递的影响不应被忽略。最后，本论文还分析讨论了在温度影响下施工周期，钢支撑层数以及支撑刚度（木垫块厚度）对施工期混凝土结构荷载传递的影响，分析并得出了一些相关规律，提出了提高施工安全性的一些改进措施。这些结论对现场施工人员有一定的借鉴意义。
[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 .
【学位授予单位】：上海交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU755

【参考文献】