钢筋混凝土构件裂缝宽度计算方法比较研究

发布时间：2018-05-17 00:33

本文选题：钢筋混凝土 + 公路桥涵　；参考：《大连理工大学》2013年硕士论文

【摘要】：针对《公路钢筋混凝上及预应力混凝土桥涵设计规范》(JTG D62-2004)修订的需要,对公路规范、建筑规范和水运规范裂缝宽度的计算方法进行了对比分析。具体内容包括： (1)分析了公路规范、建筑规范和水运规范裂缝宽度计算采用的荷载组合。分析表明,建筑规范和水运规范采用准永久组合,符合可靠性统一标准的规定；公路规范采用短期组合和长期组合,与可靠性统一标准的规定不一致。 (2)分析了影响钢筋混凝土构件裂缝宽度的因素。分析表明，建筑规范和水运规范裂缝宽度计算公式考虑了混凝土保护层厚度的影响,配筋率采用有效配筋率；公路规范未考虑混凝土保护层厚度的影响,配筋率采用全截面配筋率,没有反映裂缝控制的新研究成果。 (3)分析了不同规范中裂缝宽度计算方法的体系。分析表明,水运规范中圆形截面构件与矩形、T形、倒T形和I型截面构件裂缝宽度的计算公式是一致的,只是不同构件截而形式钢筋应力计算公式不同；公路规范中圆形截而构件与矩形、T形、倒T形和I型截面构件裂缝宽度的计算公式不一致,如果能统一成相同的形式,则工程应用更方便。
[Abstract]:In view of the need of the revision of JTG D62-2004, the calculation methods of crack width of highway code, building code and water transportation code are compared and analyzed. Specific elements include: 1) the load combination used in crack width calculation of highway code, building code and waterway code is analyzed. The analysis shows that the building code and the waterway code adopt quasi-permanent combination, which accord with the requirements of the unified reliability standard, and the highway code adopts the short-term combination and the long-term combination, which is inconsistent with the provisions of the unified reliability standard. The factors influencing the crack width of reinforced concrete members are analyzed. The analysis shows that the influence of the thickness of concrete cover is taken into account in the calculation formula of crack width in building code and water transportation code, and the effective reinforcement ratio is adopted in the reinforcement ratio, while the influence of the thickness of concrete cover is not taken into account in the highway code. The reinforcement ratio of total section is adopted, which does not reflect the new research results of crack control. The system of calculating crack width in different codes is analyzed. The analysis shows that the formula for calculating the crack width of circular cross-section members is the same as that of rectangular T-shaped, inverted T-shaped and I-shaped members, but the stress formulas of reinforcing bars in different sections are different. The formula for calculating the crack width of circular truncated members and rectangular T-shaped, inverted T-shaped and I-shaped members in highway code is inconsistent. If they can be unified into the same form, the engineering application will be more convenient.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375

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