寒冷地区坝内垫层管运行期温度效应及保温措施研究
发布时间：2018-07-27 14:46
【摘要】：为研究寒冷地区温度变化及保温措施对坝内垫层管外包混凝土开裂状况的影响,基于混凝土塑性损伤模型,考虑运行期的温度作用,对某水电站坝内垫层管进行非线性有限元分析。结果表明:由于垫层的铺设,正常运行工况下管道混凝土几乎无损伤,管道表面不会出现宏观裂缝;但在温降工况下管道顶部混凝土损伤较严重,而在温升工况下管道底部混凝土损伤更明显,相应损伤区域的钢筋应力也明显增加;坝面保温板的铺设能够有效降低结构所承担的温度荷载,改善混凝土损伤状况,降低钢筋应力,且随着保温板厚度的增加其作用效果逐渐显著,但当增加到一定程度后,其作用效果趋于稳定,同时考虑投资等工程实际情况,不宜过度增加保温板厚度,建议保温板厚度由裂缝宽度控制。
[Abstract]:In order to study the effect of temperature change and heat preservation measures on the cracking condition of the outsourced concrete in the dam of the dam, based on the plastic damage model of concrete, the nonlinear finite element analysis of the cushion pipe in the dam of a hydropower station is carried out in consideration of the temperature effect during the operation period. The results show that the pipeline is laid by the laying of the cushion and the pipe coagulation under normal operating conditions. There is little damage to the soil, and there will be no macro cracks on the surface of the pipe, but the concrete damage at the top of the pipe is serious under the condition of temperature drop, and the concrete damage in the bottom of the pipe is more obvious at the temperature rise condition, and the stress of the reinforcement in the corresponding damage area is obviously increased; the laying of the insulation board of the dam surface can effectively reduce the temperature load taken by the structure and change the temperature load. The damage condition of good concrete can reduce the stress of steel bar, and with the increase of the thickness of the insulation board, the effect of the concrete is gradually obvious, but when it is increased to a certain degree, its effect tends to be stable. At the same time, considering the actual situation of investment and other engineering conditions, it is not suitable to increase the thickness of the insulation board too much, and the thickness of the thermal insulation board is controlled by the width of the crack.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;中水东北勘测设计研究有限责任公司;
【基金】：国家自然科学基金资助项目(51409194)
【分类号】：TV732.4
本文编号：2148158
[Abstract]:In order to study the effect of temperature change and heat preservation measures on the cracking condition of the outsourced concrete in the dam of the dam, based on the plastic damage model of concrete, the nonlinear finite element analysis of the cushion pipe in the dam of a hydropower station is carried out in consideration of the temperature effect during the operation period. The results show that the pipeline is laid by the laying of the cushion and the pipe coagulation under normal operating conditions. There is little damage to the soil, and there will be no macro cracks on the surface of the pipe, but the concrete damage at the top of the pipe is serious under the condition of temperature drop, and the concrete damage in the bottom of the pipe is more obvious at the temperature rise condition, and the stress of the reinforcement in the corresponding damage area is obviously increased; the laying of the insulation board of the dam surface can effectively reduce the temperature load taken by the structure and change the temperature load. The damage condition of good concrete can reduce the stress of steel bar, and with the increase of the thickness of the insulation board, the effect of the concrete is gradually obvious, but when it is increased to a certain degree, its effect tends to be stable. At the same time, considering the actual situation of investment and other engineering conditions, it is not suitable to increase the thickness of the insulation board too much, and the thickness of the thermal insulation board is controlled by the width of the crack.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;中水东北勘测设计研究有限责任公司;
【基金】：国家自然科学基金资助项目(51409194)
【分类号】：TV732.4
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