雄安站型钢混凝土梁早期水化反应温度效应分析

Analysis on Temperature Effect of Early Hydration Reaction of Steel Concrete Beam of Xiong’an Station Type

以雄安新区高铁站站房承轨层结构为工程背景,为了制定出科学、合理、高效、安全的施工方案,对施工过程中的结构和构件质量严格把控,并使结构竣工状态能够满足设计要求,对结构关键位置型钢混凝土梁在施工过程中的水化反应情况及应力的变化规律展开研究。介绍了ABAQUS混凝土水化反应分析的分析过程和基本假定;建立了结构关键位置的型钢混凝土梁的有限元模型;利用FORTRAN语言在ABAQUS二次开发平台上编写了HETVAL、FILM子程序,对型钢混凝土梁进行了热传导分析和温度应力分析,并总结了水化反应中混凝土的温度和应力变化规律;发现水化反应中混凝土的里表温度差会不断增大,混凝土的应力会随着温度的升高而不断增大;基于分析结果发现混凝土梁底部容易出现裂缝,在施工过程中需要采取相应的控制措施。

Taking the structure of the rail-bearing layer of the high-speed rail station building of Xiong’an New Area High-speed Railway Station as the engineering background,in order to formulate a scientific,reasonable,efficient and safe construction plan,to strictly control the quality of the structure and components in the construction process,and to make the completion state of the structure meet the design requirements,the paper studies the hydration reaction of the steel concrete beam in the key position of the structure during the construction process and the change law of stress.The analytical process and basic assumptions of ABAKURS concrete hydration reaction analysis are introduced.Then a finite element model of a section steel concrete beam in a key position of the structure was established.The HETVAL and FILM subprograms were written on the ABAQUS secondary development platform with FORTRAN language,the heat conduction analysis and temperature stress analysis of the section steel concrete beam were carried out,and the temperature and stress change law of concrete in the hydration reaction were summarized.It is found that the temperature difference of the inner surface of the concrete in the hydration reaction will continue to increase,and the stress of the concrete will continue to increase with the increase of temperature.Based on the analysis results,it is found that the bottom of the concrete beam is prone to cracks,and corresponding control measures need to be taken during the construction process.