钢骨混凝土桥墩撞击抗剪强度计算模型
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摘要
为了研究钢骨混凝土桥墩的抗撞击性能,进行5根钢骨混凝土桥墩和1根钢筋混凝土桥墩水平撞击试验。试验结果表明:内置钢骨的加入对混凝土桥墩斜裂缝具有较好的抑制作用;钢骨混凝土桥墩相比钢筋混凝土桥墩具有较高的抗撞击强度。基于修正压力场理论,考虑应变率效应,分析受压区混凝土以及横向钢骨对撞击抗剪强度的影响,提出钢骨混凝土桥墩撞击抗剪强度计算模型,该模型通过斜压应力角θ和平均纵向应变εx考虑不同因素对撞击抗剪强度的影响。将不同计算模型与试验结果进行对比分析,本文模型计算结果与试验结果误差为13.10%,与试验结果较符合,可为钢骨混凝土桥墩的抗撞击设计提供参考。
The horizontal impact loads tests of one reinforced concrete bridge piers and five steel-reinforced concrete bridge piers were conducted to study anti-impact performance of steel-reinforced concrete( SRC) piers. Results show: the embedded steel has a greater inhibition effect on diagonal cracks of concrete piers; steel-reinforced concrete bridge piers have higher anti-impact strength than reinforced concrete piers. Considering the strain rate effect,the influence of concrete in compression zone and transverse steel to shear strength were analyzed, an analytical model based on the modified compression field theory was proposed for impact shear strength of steel-reinforced concrete piers. The influence of different factors on impact shear strength were considered through the angle of inclination of principal stress and the average strain in longitudinal direction. Comparing the calculated results and experimental results by using various models,the deviation between the calculated results of this paper and the experimental results is 13.10%,which is in good agreement with experimental results,it will provide references for the anti-impact design of steel reinforced concrete bridge piers.
The horizontal impact loads tests of one reinforced concrete bridge piers and five steel-reinforced concrete bridge piers were conducted to study anti-impact performance of steel-reinforced concrete( SRC) piers. Results show: the embedded steel has a greater inhibition effect on diagonal cracks of concrete piers; steel-reinforced concrete bridge piers have higher anti-impact strength than reinforced concrete piers. Considering the strain rate effect,the influence of concrete in compression zone and transverse steel to shear strength were analyzed, an analytical model based on the modified compression field theory was proposed for impact shear strength of steel-reinforced concrete piers. The influence of different factors on impact shear strength were considered through the angle of inclination of principal stress and the average strain in longitudinal direction. Comparing the calculated results and experimental results by using various models,the deviation between the calculated results of this paper and the experimental results is 13.10%,which is in good agreement with experimental results,it will provide references for the anti-impact design of steel reinforced concrete bridge piers.
引文
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[11]张莉杰,张南,杨洋,等.钢骨混凝土桥墩斜截面抗剪承载力计算研究[J].公路工程,2015,40(2):34-39.
[12]张南,王慧,陈旭,等.钢骨混凝土桥墩抗撞击性能试验研究[J].中国公路学报,2017,(11):99-107.
[13]YB 9082-2006,钢骨混凝土结构设计规程[S].
[14]JGJ 138-2001,型钢混凝土组合结构技术规程[S].
[15]魏巍巍,贡金鑫.基于修正压力场理论的有腹筋钢筋混凝土受弯构件受剪计算[J].建筑结构学报,2011,32(5):135-141.
[16]贡金鑫,魏巍巍,赵尚传.现代混凝土结构基本理论及应用[M].北京:中国建筑工业出版社,2009.
[2]Committee Euro-International du Beton(CEB).Concrete Structures Under Impact and Implosive Loading:Synthesis Report[R].Lausanne:CEB,1988.
[3]Bentz E C,Vecchio F J,Collins M P.Simplified modified compression field theory for calculating shear strength of reinforced concrete elements[J].ACIStructural Journal,2006,103(4):614-624.
[4]Collins M P,Mitchell D,Adebar P,et al.A general shear design method[J].ACI Structural Journal,1996,93(1):36-45.
[5]Vecchio F J,Collins M P.The modified compression field theory for reinforced concrete elements subjected to shear[J].ACI Journal,1986,83(22):219-231.
[6]Bentz E C,Collins M P.Development of the 2004 Canadian Standards Association(CSA)A23.3 shear provisions for reinforced concrete[J].Canadian Journal of Civil Engineering,2006,33:521-534.
[7]Rahal K N,Collins M P.Background to the general method of shear design in the 1994 CSA-A23.3[J].Canadian Journal of Civil Engineering,1999,26:827-839.
[8]魏巍巍,贡金鑫.钢筋混凝土构件基于修正压力场理论的受剪承载力计算[J].工程力学,2011,28(2):111-117.
[9]朱伟庆,贾金青,孟刚.基于修正压力场理论的型钢超高强混凝土柱受剪承载力研究[J].建筑结构学报,2013,34(10):101-107.
[10]李俊华,王新堂,赵鸿铁,等.型钢高强混凝土柱抗剪承载力的试验研究[J].西安建筑科技大学学报(自然科学版),2006,38(2):178-183.
[11]张莉杰,张南,杨洋,等.钢骨混凝土桥墩斜截面抗剪承载力计算研究[J].公路工程,2015,40(2):34-39.
[12]张南,王慧,陈旭,等.钢骨混凝土桥墩抗撞击性能试验研究[J].中国公路学报,2017,(11):99-107.
[13]YB 9082-2006,钢骨混凝土结构设计规程[S].
[14]JGJ 138-2001,型钢混凝土组合结构技术规程[S].
[15]魏巍巍,贡金鑫.基于修正压力场理论的有腹筋钢筋混凝土受弯构件受剪计算[J].建筑结构学报,2011,32(5):135-141.
[16]贡金鑫,魏巍巍,赵尚传.现代混凝土结构基本理论及应用[M].北京:中国建筑工业出版社,2009.