钢筋混凝土深梁承载力中外规范计算对比  

Comparison of shear strength calculation of reinforced concrete deep beams between different design codes

作　　者：陈富强 陈思辉 林方毅 江星 CHEN Fuqiang;CHEN Sihui;LIN Fangyi;JIANG Xing(Fujian Construction Engineering Group Co.Ltd,Fuzhou 350001;Fujian Construction of Infrastructure Engineering Group.Co.,Ltd,Fuzhou 350001;Fujian Zhuoyue Construction Group Co.Ltd,Fuzhou 350001;Fujian Rongsheng Municipal Engineering Co.,LTD.Fuzhou 350011)

机构地区：[1]福建建工集团有限责任公司,福建福州350001 [2]福建建工基础设施工程有限责任公司,福建福州350001 [3]福建卓越建设集团有限公司,福建福州350001 [4]福建省榕圣市政工程股份有限公司,福建福州350011

出　　处：《福建建筑》2023年第9期62-65,共4页Fujian Architecture & Construction

摘　　要：钢筋混凝土深梁受力原理较为复杂,其承载力计算的准确性直接影响结构的整体安全,而现有规范对其承载力的计算方法各不相同。为此,以中美规范关于钢筋混凝土深梁的计算方法为例,阐述了二者在计算模型和计算条件上的异同点,并针对规范设计的不同剪跨比下的深梁构件,通过有限元建模分析了抗剪承载力的差异。计算结果表明:剪跨比小于0.5时,构件实际承载力与设计值偏差均较大;剪跨比大于0.5时,美国规范与设计值更为接近;剪跨比接近1时,美国规范需要更大的配筋率,但却未实现相应的承载力提升效果。最后,提出了一个改进的斜截面抗剪计算公式,其估计值与试验值吻合较好。The load bearing principle of reinforced concrete deep beams is relatively complicated,and the calculation accuracy of its bearing capacity directly affects the overall safety of a structure.However,the existing design codes have different bearing capacity calculation methods.Due to this,the calculation methods of reinforced concrete deep beams in the Chinese and American design codes were used as the example by first describing their similarities and differences in the aspects of the calculation model and conditions.Then different deep beams with the various shear-to-span ratios were designed using the Chinese and American codes.The ultimate shear strengths of these beams were analyzed through finite element modeling.The analysis results have shown that the actual shear strengths had relatively large deviation from the design values when the shear-to-span ratio was less than 0.5.When the shear-to-span ratio was greater than 0.5,the actual shear strengths of the deep beams designed by the American code were closer to the design values than those by the Chinese codes.When the shear-to-span ratio approached to 1,the American code required a larger reinforcement rate without achieving a higher strength enhancement effect.Lastly,a modified shear strength formula for deep beams was proposed,whose predictions agreed well with the test values.

关 键 词：钢筋混凝土深梁 中美规范 有限元分析 抗剪承载力公式 

分 类 号：TU3[建筑科学—结构工程]