| 摘要: |
| [目的]避免某水电站厂房在施工和运行过程中因温度应力超过混凝土抗拉强度而产生裂缝.[方法]结合该厂房的实际工程情况,将大型商业有限元软件ANSYS与三维有限元温控主体程序RCTS相结合,对该河床式水电站厂房坝段施工期和运行期的温度场、温度应力进行了仿真计算.计算中考虑实际施工过程,分析了设置预留宽槽及表面保温等措施对厂房温度场及应力场的敏感性.[结果]设置预留宽槽对降低温度应力是有效的,垂直于宽槽的最大温度应力可减小约15%;上、下游面采用砂卵石回填保护后,该部位的最大温度应力可减小约20%;流道采取保温措施后,流道底板和顶板上最大温度应力减小约30%.[结论]设置预留宽槽及表面保温是减小厂房温度应力的有效措施. |
| 关键词: 水电站厂房 温度场 温度应力 温度控制 |
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| Simulation analysis of temperature control on hydropower house monolith of some water power station in river channel |
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| Abstract: |
| 【Objective】 The study was done to avoid the crack created by the thermal stress which exceeded the tensile strength of the concrete during the construction period and operating period in some hydropower house.【Method】 In light of the actual project,the well-known FEM software was combined with the 3-D FEM professional program on temperature control to carry out the simulation of temperature field and thermal stress field on power house monolith of some water power station in river channel during construction period and operating period.The actual construction progress and concrete sequence construction methods were considered in simulation calculation.Sensitivity analysis about the setting wide groove in advance and adopting surface insulation on the temperature field and thermal stress field were carried out,which provided the reference on the temperature control design and temperature control during construction period of power house in river channel.【Result】 The result showed that leaving wide trough in advance was effective in lowering the thermal stress,and the lowering rate could reach as much as 15%;after protected by the backfilled sand gravels,the maximum thermal stress at upstream face and downstream face of droped by 20%;the maximum stress at bottom plate and top plate of flow passage droped by 30% after adopting heat preservation measure.【Conclusion】 Leaving wide trough in advance and the surface heat preservation have a great effect on the reduction of the thermal stress of the hydropower house. |
| Key words: hydropower house temperature field thermal creep stress temperature control |
