黄远1,2?覮,尹文萌2,易伟建1,2.钢筋混凝土牛腿抗剪承载力设计修正系数研究[J].湖南大学学报:自然科学版,2021,(7):61~70
钢筋混凝土牛腿抗剪承载力设计修正系数研究
Study on Design Modification Factor for Shear Capacity of Reinforced Concrete Corbels
  
DOI:
中文关键词:  钢筋混凝土牛腿  软化拉压杆模型  抗剪承载力  参数分析  结构设计
英文关键词:reinforced concrete corbels  softened strut-and-tie model  shear capacity  parameter analysis  structural design
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作者单位
黄远1,2?覮,尹文萌2,易伟建1,2 (1. 湖南大学 工程结构损伤诊断湖南省重点试验室湖南 长沙 410082 2. 湖南大学 土木工程学院湖南 长沙 410082) 
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中文摘要:
      为了研究钢筋混凝土牛腿的抗剪承载力,并评估我国和欧美规范牛腿设计方法的准确性和安全性,基于收集的209组牛腿竖向受剪试验数据对ACI 318-19、EC2、CSA A23.3-04和其他主要的牛腿抗剪承载力计算方法进行评估,发现欧美规范拉压杆模型方法较为保守,而软化拉压杆模型(softened strut-and-tie model,SSTM)能够较好地预测牛腿的抗剪承载力. 在此基础上,设计了一系列满足我国规范要求的钢筋混凝土牛腿,主要变化的参数包括剪切跨度、混凝土强度、钢筋强度等,通过将牛腿的设计剪力与软化拉压杆模型计算得到的抗剪承载力进行对比,分析了不同设计参数下我国规范方法的准确性和安全性. 并根据参数分析结果拟合了牛腿承载力修正系数的简化公式,并通过试验数据验证了简化公式的准确性和合理性. 最后对牛腿在剪力作用下的设计方法提出了改进建议,可供钢筋混凝土牛腿设计参考.
英文摘要:
      In order to study the shear capacity of reinforced concrete corbels,and evaluate the accuracy and safety of the design method of Chinese and abroad code,based on the collected test data of 209 corbels,the shear capacity formulas of ACI 318-19,EC2,CSA A23.3-04 as well as the main strut-and-tie models were evaluated. It was found that the calculation results of abroad code are too conservative,while the softened strut-and-tie model(SSTM) can better predict the shear capacity of corbel. On this basis,a series of reinforced concrete corbels were designed according to the Chinese code with various parameters including shear span,concrete strength,reinforcement strength,etc. By comparing the designed shear capacity with the calculation results of the softened strut-and-tie model,the accuracy and safety of Chinese code under different design parameters were analyzed. Then,the simplified formula of the modification factor of the corbel bearing capacity was proposed. Based on the collected test data,the simplified formula was proved to be accurate. Design suggestions were proposed for the corbels under shear load,which can be used as a reference for the design of reinforced concrete corbels.
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