【作者】 庄家智；

【导师】 周志祥；

【作者基本信息】 重庆交通大学 ， 结构工程， 2010， 硕士

【摘要】 本文对导师提出的在混凝土结构的受拉侧设置带肋钢板(即RSPC)—以解决局部区域拉应力峰值大,应力衰减快的工程结构问题的构想。所做的主要研究工作和结论如下:①进行了RSPC受弯构件的试件设计和试验研究,结果表明:RSPC受弯构件的抗裂能力较普通钢筋混凝土结构显著提高(2倍),同比裂缝宽度显著减小。②利用集中闭合力阻裂、Griffith能量释放观点等原理,从宏观和微观两方面分析了RSPC受弯构件的阻裂机理。③研究表明在受拉侧设置带肋钢板,受拉侧混凝土在带肋钢板的约束和帮助下,其名义极限抗拉强度和极限拉应变都得到显著提高,依据试验结果建立了带肋钢板加强区内混凝土的简化弯拉应力—应变关系。④通过试验研究和理论分析,提出RSPC极限拉应变的简化计算模型,以及极限拉应变与开裂弯矩的初步计算方法。⑤随着钢肋高度的增加,RSPC的抗裂能力也随之增大,但RSPC的抗裂能力并不是无限制增加的,本文提出了钢肋高度的合理限值。⑥针对悬挑结构道路中挑梁局部区域拉应力峰值大,应力衰减快的实际工程问题,按RSPC方案完成了挑梁的施工图设计,分析表明RSPC挑梁在不明显增大施工难度条件下能明显提高抗裂性能或明显减小裂缝宽度。更多还原

【Abstract】 Professor Zhou presents the concept of using the ribbed steel plate in the concrect tension side (RSPC)-to solve the problem which the stress is very large and decreases rapidly in some local areas. The thesis are summarized in the following aspects:①The experimental researches on the flexural members behaviors of the RSPC have been designed and completed. The experimental results show that compared with the RC structures, the anti-crack performance, are improved about 2 times, and crack width significantly reduces.②Using the principles of the concentrated force crack arresting and the energy release of Griffith, the paper analyses the mechanism against crack of RSPC from macro and micro aspects.③The research shows that, with the constraint of the ribbed steel plate the nominal ultimate tensile strength and nominal ultimate tensile strain has been increased.The simplified tension stress-strain relationship of the RSPC composite structures has been gotten.④Through experimental study and theoretical analysis, this paper presents the simplified calculation model of the RSPC ultimate tensile strain, and the calculating methods for the ultimate tensile strain and cracking moment.⑤The anti-crack performance of the RSPC will not increased unlimitedly with the increasing of the height of the steel plate. This paper put forward the reasonable height of the steel plate.⑥To solving the problem which the stress is very large and decreases rapidly in the cantilever beam of overhanging structure,the RSPC construction drawing design has been made.The research shows that the RSPC have a good effect in improving the cracking moment and decreasing the width of the crack.And the construction difficulty will not increase.更多还原