拱坝聚氨酯保温层在冲击作用下的动力响应研究
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摘要
基于动力计算理论,采用有限元法对不同冲击作用下拱坝聚氨酯保温层的动力响应进行数值模拟,通过跟踪冲击过程中应力变化分析了保温层的瞬态动力特性,并提出了一定的保护措施。计算结果表明,聚氨酯保温层动力响应不受撞击位置的影响,与撞击速度呈正相关;多点撞击时,各点之间相互影响,点群中心位置动力响应剧烈。同时铁丝网砂浆具有良好的保护性能,可为工程安全防护提供参考。
Based on the theory of dynamic calculation, the dynamic responses of polyurethane insulation layer of arch dam under different impact loads are simulated by finite element method. The transient dynamic characteristics of insulation layer are analyzed by tracking the stress changes in impact process, and some protective measures are proposed. The calculation results show that,( a) the dynamic response of polyurethane insulation layer is not affected by the impact position, but is positively correlated with the impact velocity, and( b) when multiple impacts occur, the impact points interact with each other, and the dynamic response in the center of point group is severe. At the same time, the wire mesh mortar has good protection performance, which can provide reference for engineering safety protection.
Based on the theory of dynamic calculation, the dynamic responses of polyurethane insulation layer of arch dam under different impact loads are simulated by finite element method. The transient dynamic characteristics of insulation layer are analyzed by tracking the stress changes in impact process, and some protective measures are proposed. The calculation results show that,( a) the dynamic response of polyurethane insulation layer is not affected by the impact position, but is positively correlated with the impact velocity, and( b) when multiple impacts occur, the impact points interact with each other, and the dynamic response in the center of point group is severe. At the same time, the wire mesh mortar has good protection performance, which can provide reference for engineering safety protection.
引文
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[2]杜彬.聚氨酯硬质泡沫在大坝工程中的应用研究[J].水利水电科技进展,2002,22(4):14-16.
[3]高霈生,靳国厚.中国北方寒冷地区河冰灾害调查与分析[J].中国水利水电科学研究院学报,2003,1(2):159-164.
[4]李鹏辉,杜彬,刘光廷,等.石门子碾压混凝土拱坝采用聚氨酯硬质泡沫保温保湿的效果分析[J].水利水电技术,2002,33(6):37-38.
[5]刘光廷,焦修刚.混凝土的热湿传导耦合分析[J].清华大学学报:自然科学版,2004,44(12):1653-1655,1671.
[6]颜熹琳,周筱雨,温茂萍,等.多因素加速老化对硬质聚氨酯泡沫塑料压缩力学性能的影响研究[J].化工新型材料,2012,40(9):56-58.
[7]沈波.冲击荷载下人字门的动力反应分析[J].水电能源科学,2009,27(2):119-121.
[8]杜彬.寒冷地区碾压混凝土坝喷涂聚氨酯施工仿真[J].三峡大学学报:自然科学版,2010,32(3):28-32.