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(1 湖南大學(xué)土木工程學(xué)院， 長(zhǎng)沙 410012； 2 湖南大學(xué)工程結(jié)構(gòu)損傷診斷湖南省重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410012)

［摘要］已有研究表明，鋼筋混凝土（RC）剪扭受力構(gòu)件中，剪扭承載力存在相關(guān)性。我國(guó)《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》（GBJ 10—89，GB 50010—2002和GB 50010—2010）基本沿用了相同的剪扭相關(guān)模型，即簡(jiǎn)化的三折線模型，這可能導(dǎo)致承載力局部計(jì)算結(jié)果偏于不安全。1/4圓弧曲線、直線、改進(jìn)的三折線剪扭相關(guān)模型及對(duì)應(yīng)的承載力計(jì)算公式被相繼提出。在分析控制可靠指標(biāo)β及其影響因素的基礎(chǔ)上，提出規(guī)范及各修正公式對(duì)應(yīng)的抗剪可靠指標(biāo)和抗扭可靠指標(biāo)存在一定程度的不平衡性，這種不平衡性取決于各公式相關(guān)模型對(duì)應(yīng)的抗扭和抗剪承載降低系數(shù)。從配箍量、最低可靠指標(biāo)和可靠指標(biāo)的平衡性等角度，對(duì)規(guī)范及各修正公式進(jìn)行了全面分析與比較。

［關(guān)鍵詞］RC剪扭構(gòu)件；相關(guān)性；修正公式；可靠指標(biāo)；平衡性

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)02-0055-09

Reliability research on bearing capacity formula of RC  shear and torsion members

Zhang Wangxi1,2, Li Bo1, Deng Xi1, Xiao Longjie1, Liu Jingjin1, Han Jiang1

(1 Civil Engineering College, Hunan University, Changsha 410012, China；2 Hunan Provincial Key Lab on Diagnosis for Engineering Structures,  Hunan University, Changsha 410012, China)

Abstract:The research results indicate that there exists correlation between shear capacity and torsion capacity in the RC shear and torsion members. In China, Code for design of concrete structures（GBJ 10—89, GB 50010—2002 and GB 50010—2010）, always carry out the same shear and torsion correlation model, that is simplified trilinear model. This model may cause the bearing capacity calculation results to unsafe state sometimes. The models based on the 1/4 circular arcs, straight line and modified trilinear, as well the corresponding formula for calculating bearing capacity were put forward one after another. Based on the analysis of control reliability index β and its affecting factors, the unbalance of shear and torsion reliability index according to different formulas was pointed out. This unbalance depends on the reducing coefficient of shear and torsion bearing capacity that is corresponding to the formula for different model. From the point of strip steel, minimum reliability index and the balance of reliability index, the code and modified formula were analyzed fully and compared with each other.

Keywords:RC shear torsion member; correlation; modified formula; reliability index; balance

*國(guó)家自然科學(xué)基金資助項(xiàng)目（51578228，51338004）,國(guó)家重點(diǎn)專項(xiàng)(2016YFC0701400)。

作者簡(jiǎn)介：張望喜，博士，副教授，Email：wxizhang2000@hnu.edu.cn。