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在建的百万千瓦机组大型火力发电厂主厂房由于工艺上的原因,通常无法设置伸缩缝而形成超长结构。采用钢筋混凝土框架的超长结构具有良好的技术经济指标,但不可避免的遇到温度作用问题。采用弹塑性模型对某火力发电厂超长钢筋混凝土框架结构进行了分析,与以往的弹性分析相比具有如下特点:1)弹塑性温度应力分析能更准确地分析结构在温度作用下的效应;2)能考虑竖向荷载产生的裂缝对温度效应的影响。通过与弹性分析结果的对比发现,弹塑性分析得到的温度应力效应与弹性分析的结果有较大的差异。建立了温度作用下超长框架的裂缝宽度分析模型,为超长框架结构是否满足正常使用极限状态的要求提供了定量分析的方法。分析方法及结果对实际工程具有较高的参考价值。
Millions of kilowatts under construction in the main thermal power plant main plant due to process reasons, usually can not set the expansion joints and the formation of long structure. Long structure with reinforced concrete frame has good technical and economic indicators, but inevitably encountered the problem of temperature. The elastic-plastic model is used to analyze the super-long reinforced concrete frame structure of a thermal power plant, which has the following characteristics compared with the previous elastic analysis: 1) Elastoplastic temperature stress analysis can more accurately analyze the effect of structure under temperature; 2) The effect of cracks caused by vertical loads on the temperature effect can be considered. By comparing with the results of elastic analysis, it is found that there are great differences between the results of elasto-plastic analysis and the results of elastic analysis. The crack width analysis model of the ultra-long frame under temperature is established to provide a quantitative analysis method for whether the ultra-long frame structure meets the requirements of normal use limit state. Analysis methods and results of the actual project has a high reference value.