钢筋混凝土结构施工期温度影响的控制(下)

钢筋混凝土结构在施工阶段实际上是一个部分完成的结构和模板支撑系统构成的"时变结构"。近些年来,环境日夜温差对结构安全的影响逐渐得到重视。本文在国内外相关研究的基础上,提出了新的考虑日夜环境温差影响的钢筋混凝土框架、板柱和剪力墙结构在施工期的结构模型和分析方法,并编制了相应的"考虑温度影响的施工过程安全分析"(Safety Analysis during Construction considering Temperature,SACT)应用软件。通过同现场实测数据的比较,验证了软件计算结果的准确性和适用性。此外,本文还讨论了温度对施工期荷载传递的影响,揭示了温度影响下的钢筋混凝土结构施工期荷载传递规律,提出了控制温度不利影响的一些规则。

Temperature effect control of reinforced concrete structures during construction

The reinforced concrete structure during construction is a time-dependent structure which consists of a partly completed structure and a formwork-shore system. In recent years, the effect of ambient temperature variation between day and night on the analytical results attracts more and more attention. In the present paper, a new structural model and analysis methods for reinforced concrete frames,slab-column systems, and shear wall structures is proposed based on related researches, and a new software named Safety Analysis during Construction considering Temperature （SACT） is programmed. Afterwards, the software has been validated to be accurate and applicative by comparing with on-site measurements. Besides ,the effect of temperature on load transfer during construction is discussed, the load transfer mechanism of reinforced concrete structures during construction under the influence of temperature is presented, and finally several rules to control negative effects caused by temperature are also proposed.