现浇混凝土楼板裂缝分析及综合控制措施

现浇混凝土楼板裂缝分析及综合控制措施 
中文摘要
由于水泥砂浆的大量使用,以及水泥砂浆的抽运,使得水泥砂浆的建设工期大幅减少,因此,在此条件下,现浇筑的钢筋砼地面也会产生一定的开裂。此类裂纹往往会造成楼板渗漏,钢筋锈蚀,混凝土碳化等问题,从而导致了工程质量的下降。对于现浇层的裂缝,论文主要开展了如下工作:首先,从理论上对现浇层的裂缝类型、主要特点、形成机理以及发展历程进行了研究。本文从设计、施工两个角度,对造成现浇砼地面开裂的原因进行了剖析,并给出了一些防治方法,并通过具体的工程实践,探讨了怎样防治现浇砼地面开裂。为更好地预防混凝土开裂,本文对混凝土结构的开裂进行了全面的防治,也就是从各个环节入手,在各个环节都要进行针对性的防治。通过一个具体的案例,应用离散模型对某高层建筑的 RC楼层进行了数值仿真,验证了用 FEM技术对 RC楼层进行数值仿真的有效性,并针对 RC楼层的缺陷及裂纹发展历程,给出了相应的预防措施。
关键词:   现浇混凝土楼板; 裂缝; 综合控制; 有限元                               
Abstract
Due to the large use of cement mortar and the pumping of cement mortar, the construction period of cement mortar has been greatly reduced. Therefore, under this condition, the cast-in-place reinforced concrete floor will also produce certain cracks. Such cracks often cause floor leakage, reinforcement corrosion, concrete carbonization and other problems, which leads to the decline of project quality. For the cracks in the cast-in-place layer, the main work of the thesis is as follows: First, the types, main characteristics, formation mechanism and development process of the cracks in the cast-in-place layer are studied theoretically. This thesis analyzes the causes of cracking of cast-in-place concrete floor from the two aspects of design and construction, and gives some prevention methods, and discusses how to prevent cracking of cast-in-place concrete floor through concrete engineering practice. In order to better prevent concrete cracking, this thesis has carried out a comprehensive prevention and control of concrete structure cracking, that is, starting from each link, we should carry out targeted prevention and control in each link. Through a specific case, the discrete model is applied to numerical simulation of the RC floor of a high-rise building, which verifies the effectiveness of numerical simulation of the RC floor using FEM technology, and provides corresponding preventive measures against the defects and crack development process of the RC floor.
Key words: Cast-in-situ concrete floor slab; Cracks; Integrated control; Finite element

目    录
引  言 1
1  钢筋混凝土裂缝理论分析 3
1.1  混凝土裂缝的基本概念 3
1.2  混凝土裂缝产生的主要原因 3
1.3  混凝土收縮的分类及机理 5
2  现浇楼板裂缝有限元分析及数值模拟 6
2.1  裂缝模拟的计算理论模型 6
2.2  裂缝模拟的有限元分析理论 7
3  裂缝的控制方法 8
3.1  设计因素导致的裂缝原因及其控制措施 8
3.2  施工因素导致的裂缝原因及其控制措施 10
3.3  现淺混凝土楼板裂缝的综合控制方法 12
结  论 14
致  谢 15
参考文献 16
 
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