某超长高低跨钢筋混凝土工业厂房温度影响分析

发布时间：2018-04-23 22:39

本文选题：超长 + 钢筋混凝土　；参考：《广西大学》2014年硕士论文

【摘要】：多数钢筋混凝土结构处于带裂缝工作状态,其中温度对超长高低跨钢筋混凝土工业厂房的影响是不容忽视的,当结构混凝土因所受内力及温差或收缩应力叠加值大于混凝土抗拉强度时会导致结构混凝土开裂。本文以南方地区某多层多跨且长度为110m的超长工业厂房钢筋混凝土框架结构为工程背景,在对国内外相关文献进行必要的归纳与总结的基础上,首先获取工程所在地15年的温度相关资料并通过数值分析,研究了该超长钢筋混凝土框架结构在多种温度工况作用下的温度效应及其影响,分析了温度应力的大小范围及分布规律；其次推导了单阶柱在温度侧向变形和混凝土收缩变形双重作用对柱子长细比的影响,研究了温度侧向变形和混凝土收缩变形等因素对单阶柱计算长度系数的影响,计算分析本工程单阶柱在同时考虑温度侧向变形和混凝土收缩变形影响下的计算长度系数。文章得到如下主要结论：1)在综合温差作用下,结构变形以收缩为主,结构的整体位移在0-17.65mm之间,纵向收缩位移达到11.95mm,竖向收缩变形达到11.2mm。在离结构底部基础约束最远的塔楼屋面受到的约束作用相对最弱,故其变形值最大,数值为17.65mm；所以结构的整体变形随结构高度的增高呈逐渐增大的趋势。2)纵向框架梁的内力及框架柱的内力与相邻构件(横向框架梁)对其的约束情况有关,截面尺寸大的横向框架梁对纵向框架梁和柱子的约束作用越强,与横向框架梁同层及相邻上一层的纵向框架梁的内力、横向框架梁底的柱子的内力相应越大。3)当结构中内、外部构件降温或升温数值不同时,框架的边跨梁由于变形不协调而产生变形差,此变形差将在边跨梁内引起较大的弯矩。4)通过对本工程A轴单阶柱的计算长度系数进行对比分析可知,在同时考虑温度侧向变形和混凝土收缩变形影响下的计算长度系数μ2值的增大率为7.18%,超过了工程设计中规定的允许误差5%的要求,因此在对钢筋混凝土工业厂房单阶柱进行稳定承载力分析时,不容忽视温度侧向变形和混凝土收缩变形对单阶柱计算长度系数的不利影响。
[Abstract]:Most reinforced concrete structures are in the state of working with cracks, and the influence of temperature on the industrial building of reinforced concrete with long span and high span can not be ignored. When the superposition value of internal force, temperature difference or shrinkage stress of structural concrete is larger than the tensile strength of concrete, it will lead to the cracking of structural concrete. In this paper, the reinforced concrete frame structure of a multi-story and multi-span industrial factory building with a length of 110m is taken as the engineering background, on the basis of the necessary induction and summary of the relevant literature at home and abroad. Firstly, the temperature effect and its influence of the super-long reinforced concrete frame structure under various temperature conditions are studied by obtaining the temperature related data of the site of the project for 15 years and through numerical analysis. The range and distribution of temperature stress are analyzed. Secondly, the influence of the double action of temperature lateral deformation and concrete shrinkage deformation on the aspect ratio of single column is deduced. The effects of temperature lateral deformation and concrete shrinkage deformation on the calculated length coefficients of single columns are studied. The calculated length coefficients of single columns under the influence of both temperature lateral deformation and concrete shrinkage deformation are calculated and analyzed. The main conclusions are as follows: (1) under the action of comprehensive temperature difference, the deformation of the structure is mainly shrinkage, the whole displacement of the structure is between 0-17.65mm, the longitudinal shrinkage displacement is 11.95 mm, and the vertical shrinkage deformation is 11.2 mm. The roof of the tower with the furthest constraints from the bottom foundation of the structure is subjected to the weakest constraint, so its deformation value is the largest. The internal force of longitudinal frame beam and the internal force of frame column are related to the constraint of adjacent members (transverse frame beam). The larger the cross section size is, the stronger the constraint on the longitudinal frame beam and column is, the stronger the internal force of the longitudinal frame beam on the same floor as the transverse frame beam, and the larger the internal force of the column at the bottom of the transverse frame beam. 3) in the structure, the inner force of the longitudinal frame beam on the same floor as the transverse frame beam and the column at the bottom of the transverse frame beam is larger. The deformation difference of the side span beam of the frame is caused by the incongruity of deformation due to the difference of the temperature drop or the heating value of the external member. This deformation difference will cause a large bending moment. 4) by comparing and analyzing the calculated length coefficient of A axis single column in this project, we can know that, Under the influence of both temperature lateral deformation and concrete shrinkage deformation, the increase rate of the calculated length coefficient 渭 2 is 7.18, which exceeds the allowable error of 5% in engineering design. Therefore, in the analysis of the steady bearing capacity of the single column in the reinforced concrete industrial powerhouse, the adverse effects of temperature lateral deformation and concrete shrinkage deformation on the calculated length coefficient of the single column can not be ignored.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375

【参考文献】