溢洪道闸墩薄壁混凝土置换加固温度应力分析及验证
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摘要
为论证置换表层混凝土方案的可行性,通过模拟溢洪道闸墩加固工程表层薄壁混凝土的浇筑施工过程,对混凝土的温度应力场进行了三维有限元仿真分析。分析表明:选择气温2℃～10℃左右的季节,采用2.5 m厚度的分仓浇筑方法施工,新浇薄层混凝土施工期温差在10℃以内,最大温度应力为1.41 MPa,满足规范要求。施工过程也验证新浇混凝土未出现裂缝。计算分析和监测均表明置换表层混凝土方案是可行的,研究成果可为类似工程加固设计提供参考。
To reason the feasibility of the scheme about the replacement cover concrete,this paper analyzes the thermal stress field by using 3D finite element simulation analysis to simulate the construction process of thin-walled cover concrete.The analysis indicated that the temperature difference of thin-walled new concrete was within 10 ℃ in construction period and the maximum thermal stress of it was 1.41 MPa,when the air temperature was around 2 ℃～10 ℃ and the thickness of sequence placing was 2.5 m.The results comforted code requirement,and it was validated that there were no cracks in the new concrete in construction period.The calculation analysis and monitoring result show that the scheme of replacing cover concrete is feasible.The results in this paper are valuable for design and construction in analogy project.
To reason the feasibility of the scheme about the replacement cover concrete,this paper analyzes the thermal stress field by using 3D finite element simulation analysis to simulate the construction process of thin-walled cover concrete.The analysis indicated that the temperature difference of thin-walled new concrete was within 10 ℃ in construction period and the maximum thermal stress of it was 1.41 MPa,when the air temperature was around 2 ℃～10 ℃ and the thickness of sequence placing was 2.5 m.The results comforted code requirement,and it was validated that there were no cracks in the new concrete in construction period.The calculation analysis and monitoring result show that the scheme of replacing cover concrete is feasible.The results in this paper are valuable for design and construction in analogy project.
引文
[1]长江勘测规划设计研究有限责任公司.江西省南城县洪门水电站溢洪道闸墩补强加固工程可行性研究专题报告[R].
[2]GB 50367-2013,混凝土结构加固设计规范[S].
[3]长江水利委员会长江科学院.江西省洪门水电站溢洪道闸室补强加固结构分析[R].
[4]陈叶文,段亚辉.溪洛渡泄洪洞有压段圆形断面衬砌混凝土温控研究[J].中国农村水利水电,2009(5):116-119.
[5]NB/T 35092-2017,混凝土坝温度控制设计规范[S].
[2]GB 50367-2013,混凝土结构加固设计规范[S].
[3]长江水利委员会长江科学院.江西省洪门水电站溢洪道闸室补强加固结构分析[R].
[4]陈叶文,段亚辉.溪洛渡泄洪洞有压段圆形断面衬砌混凝土温控研究[J].中国农村水利水电,2009(5):116-119.
[5]NB/T 35092-2017,混凝土坝温度控制设计规范[S].