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Comparison study on calculation methods of bending behavior of Chinese reinforced concrete beams from 1912 to 1949

Journal of Southeast University(English Edition) 2015年第4期31卷 529-534页

作者：淳庆 van balen koenraad 韩宜丹东南大学建筑学院南京210096 东南大学城市与建筑遗产保护教育部重点实验室南京210096 上海市建筑科学研究院上海市工程结构安全重点实验室上海200032 Department of Civil Engineering KU Leuven

In order to study the calculation methods of bending behavior of Chinese reinforced concrete beams from 1912 to 1949, tests on the mechanical performance of 66 rebars from different modem Chinese concrete buildings, the concrete compressive strength of 12 modem Chinese concrete buildings, and the concrete cover thickness of 9 modem Chinese concrete buildings are carried out; and the actual material properties and structural conformations of modem Chinese concrete buildings are obtained. Then, the comparison on calculation methods of bending behavior including the original Chinese calculation method, the present Chinese calculation method, the present American calculation method and the present European calculation method is studied. The results show that the original Chinese calculation method of bending behavior is based on the allowable stress calculation method, and the design safety factors are 3.55 to 4. 0. In term of the calculation area of longitudinal rebars of reinforced concrete beams, without considering earthquake action, the original Chinese structural calculation method is safer than the present Chinese structural calculation method, the present European structural calculation method, and the present American structural calculation method. The results can provide support for the structural safety assessments of modem Chinese reinforced concrete buildings.

关键词： reinforced concrete beam the Republic of China era from 1912 to 1949 bending behavior calculation method comparative study

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Comparative Studies on Calculation Methods of Shear Behavior of Reinforced Concrete Beams of Chinese Modern Reinforced Concrete Buildings

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Journal of Harbin Institute of Technology(New Series) 2016年第2期23卷 1-8页

作者： Qing Chun koenraad van balen Yidan Han School of Architecture Southeast University Nanjing 210096 China Key Lab of Urban & Architectural Heritage Conservation Ministry of Education Southeast University Nanjing 210096 China Department of Civil Engineering KU.Leuven Heverlee 3001 Belgium

In order to study the calculation methods of shear behavior of reinforced concrete beams of Chinese modern reinforced concrete buildings,this paper carried out tests on the concrete compressive strength of 12 Chinese modern concrete buildings,the mechanical properties of 66 rebars from different Chinese modern concrete buildings,and the concrete cover thickness of 9 Chinese modern concrete buildings,and the actual material properties and structural configurations have been obtained. Then,the comparison on calculation methods include the Chinese original calculation method,the Chinese present calculation method,the American present calculation method and the European present calculation method is studied with case analysis *** results show that the Chinese original calculation method of shear behavior of reinforced concrete beams is based on the allowable stress calculation method,and the design safety factors are 3. 55- 4. 00. The standard value of the compressive strength of concrete cubes is 8. 48 MPa,the standard value of the concrete tensile strength is 1.20 MPa,the standard value of the yield strength of rectangular rebars is 229. 56 MPa,and the standard value of the yield strength of round rebars is 276. 82 MPa. The average value of the concrete cover thickness of beams and columns is 35.96 mm. In term of calculation area of hoop rebars of reinforced concrete beams,without considering earthquake loads,the Chinese original structural calculation method is safer than the Chinese present structural calculation method,but is more unsafe than the American present structural calculation method and the European present structural calculation method. The results can provide the support for structural safety assessments and repair designs of Chinese modern reinforced concrete buildings.

关键词： reinforced concrete buildings the Republic of China era from 1912 to 1949 shear behavior calculation method comparative study

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