压弯荷载作用下钢筋混凝土支撑温度效应分析*
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潘华，褚伟洪，戴加东（上海岩土工程勘察设计研究院有限公司， 上海 200002）［摘要］阐述了钢筋混凝土支撑温度内应力作用机理，以一处于压弯荷载作用下的钢筋混凝土支撑为试验对象，利用自动化监测技术采集其在加载过程中的轴力和温度变化数据。基于试验数据，简单验证了弯曲荷载的作用效应，考察了不同截面位置对温度内应力的影响，初步确定了温度内应力的修正方法。结果表明：实测值与理论值吻合得较好，说明试验方法的可靠性与试验数据的准确性；温差大的截面位置会产生较大的温度内应力，截面上部温度内应力最大、下部次之、中部最小；采用线性方法对支撑轴力进行修正能取得一定的效果。［关键词］自动化监测; 温度内应力; 压弯荷载; 钢筋混凝土支撑中图分类号：TU375，TU119+.22 文献标识码：A 文章编号：1002-848X(2013)18-0070-04Analysis of temperature effect in reinforced concrete struts under compact-bending loadPan Hua, Chu Weihong, Dai Jiadong(Shanghai Geotechnical Investigation & Design Institute Co., Ltd., Shanghai 200002, China )Abstract: Mechanism of temperature internal stress in reinforced concrete struts was introduced. A reinforced concrete strut under compact-bending load was experimented, while automatic monitoring technology was used to collect the data of axial force and temperature. Based on the experimental data, the effect of bending load was validated, the effect of section position on temperature internal stress was studied, and the preliminary correction method of temperature internal stress was provided. Results show that, the accordance of theoretical results and facts under bending load validates the reliability of test method and the accuracy of test data; temperature internal stress is larger in the section position with larger temperature difference and the temperature internal stress of the upper, bottom and center sections decreases successively; the correction of axial load with linear method can obtain certain effect.Keywords: automatic monitoring; temperature internal stress; bending load; reinforced concrete strut*上海岩土工程勘察设计研究院内部课题（2010-004）。作者简介：潘华，博士，工程师，Email：hua_pan1983@163.com参考文献［1］李继超.温度对混凝土支撑轴力影响的探讨［J］. 施工技术,2000, 29(1):58.［2］郑刚, 顾晓鲁. 考虑支撑围护桩-土相互作用的基坑支护水平支撑温度应力的简化分析法［J］. 土木工程学报, 2002, 35(3):87-89.［3］吴明, 孙鸣宇, 夏唐代, 等. 多层支撑深基坑中考虑支撑-围护桩-土相互作用的水平支撑温度应力简化计算方法［J］. 土木工程学报, 2009, 42(1):91-94.［4］艾智勇, 苏辉. 深基坑多层水平支撑温度应力的简化计算方法［J］. 同济大学学报：自然科学版, 2011, 39(2):199-203.［5］陆培毅, 韩丽君, 于勇. 基坑支护支撑温度应力的有限元分析［J］. 岩土力学, 2008, 29(5): 1290-1294.［6］和再良, 陈刚. 云毅大厦深基坑围护支撑轴力的测试与计算［J］. 岩土力学, 1997, 18(A08): 285-289.［7］鲁智明, 和再良, 陈刚. 基坑工程监测中钢筋混凝土支撑轴力测试计算方法［J］. 上海地质, 2010 (1):46-49.［8］姚顺雨, 林立祥. 深基坑支撑轴力测试与分析［J］. 建筑结构, 2012, 42(1):112-114.
