杜毛毛

（华侨大学土木工程学院，厦门 361021）

 

[摘要] 基于收集整理的902个钢筋混凝土梁和287个预应力混凝土梁的跨中挠度试验数据样本，从计算方法、表达形式和计算精度等方面，对中美欧混凝土规范的短期刚度计算模式进行了比较。结果表明，与开裂弯矩有关的刚度公式可用一个统一公式来表示，当计算弯矩与开裂弯矩相差不大时，各公式计算值对开裂弯矩的变化非常敏感。对钢筋混凝土梁，中国规范GB 50010-2010精度最好，中国规范SL 191-2008其次，中国规范JTG D62-2004最低。对预应力混凝土梁，中国规范SL 191-2008精度最高，美国规范ACI 318-08最低，中国规范GB 50010-2010刚度公式对后张有粘结预应力混凝土梁的适用性不甚理想。

[关键词] 受弯构件；短期刚度；规范比较；计算精度

中图分类号：TU375-1文献标识码：A文章编号：1002-848X(2012)10-0098-04

 

Du Maomao

(College of Civil Engineering, Huaqiao University, Xiamen 361021, China)

 

Abstract: Based on mid-span deflections of 902 reinforced concrete beams and 287 prestressed concrete beams, the calculation models of short-term stiffness of Chinese, American and European concrete codes were compared from calculation method, expression form and calculation accuracy. Results show that the stiffness formulae using cracking moment can be unified to one formula; the calculated values of formulae are very sensitive to the change of cracking moment when calculating moment is approach to cracking moment. For reinforced concrete beams, the accuracy of Chinese code GB 50010-2010 is highest, then Chinese code SL 191-2008 is lower, Chinese code JTG D62-2004 is the lowest. For prestressed concrete beams, Chinese code SL 191-2008 has the highest accuracy, while American code ACI 318-08 has the lowest one, the accuracy of the stiffness formula in Chinese code GB 50010-2010 is not good to post-tensioned bonded prestressed concrete beams.

Keywords: flexural member; short term stiffness; code comparison; calculation accuracy

*中央高校基本科研业务费资助项目（JB-ZR1230），福建省自然科学基金计划项目（2012J01222），华侨大学高层次人才科研启动费项目（11BS106）。

作者简介：杜毛毛，博士，讲师，Email：dumm@hqu.edu.cn。

 

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［5］ACI 318—08 Building code requirements for structural concrete and commentary ［S］. ACI Committee Institute, 2008.

［6］EN 1992-1-1: 2004 Eurocode 2: design of concrete structures-part 1-1: general rules and rules for buildings ［S］. European Committee for Standardization, 2004.

［7］杜毛毛. 配500MPa钢筋后张有粘结预应力混凝土梁受弯性能研究［D］. 上海: 同济大学, 2010.