有侧压混凝土动态劈拉力学性能试验研究
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摘要
为模拟混凝土结构在地震等动态荷载作用下的真实应力状态,进行不同侧压力下的混凝土动态劈拉试验。对混凝土劈拉强度、峰值应变、弹性模量等力学性能与应变速率、侧压力之间的变化规律展开深入的分析,并基于统计分布理论改进了Mazars劈拉本构模型。研究结果表明,侧压力作用下混凝土劈拉受荷的力学性能仍具有率效应,应变速率和侧压力的增大均会引起混凝土劈拉强度与劈拉弹性模量的提高,混凝土动态峰值应变会随侧压力增大呈现出先减小后增大的变化规律。改进后的本构模型对不同侧压力下的混凝土动态劈拉应力-应变曲线拟合效果都很好,其中上升段拟合参数c值受应变速率与侧压力的双重影响,而下降段拟合参数A_T和B_T值则主要由试验条件决定。与其他学者的数据进行拟合比较,可以发现该模型具有很好的适用性。
Dynamic splitting tensile test under varying lateral pressure was conducted to simulate the actual stress state of concrete structures under earthquake and other dynamic loads. The variations of concrete's splitting tensile strength, peak strain, and elastic modulus against strain rate and lateral pressure were examined in depth, and Mazars' splitting tensile constitutive model was modified based on statistical distribution theory. Results suggest that the variations of mechanical properties of concrete under splitting tension and lateral pressure still display strain effect: increases in strain rate and lateral pressure could both enhance the splitting tensile strength and splitting modulus of elasticity; with the climbing of lateral pressure, the dynamic peak stress of concrete firstly reduced but then augmented. The modified constitutive model could well fit the dynamic splitting tensile stress-strain curves of concrete under different lateral pressures. The fitting parameter c of the upward segment of the stress-strain curve is affected by both strain rate and lateral pressure, while parameters A_T and B_T of the downward segment mainly depend on test conditions. Comparisons with data obtained by other scholars reveal that the modified model is of good suitability.
Dynamic splitting tensile test under varying lateral pressure was conducted to simulate the actual stress state of concrete structures under earthquake and other dynamic loads. The variations of concrete's splitting tensile strength, peak strain, and elastic modulus against strain rate and lateral pressure were examined in depth, and Mazars' splitting tensile constitutive model was modified based on statistical distribution theory. Results suggest that the variations of mechanical properties of concrete under splitting tension and lateral pressure still display strain effect: increases in strain rate and lateral pressure could both enhance the splitting tensile strength and splitting modulus of elasticity; with the climbing of lateral pressure, the dynamic peak stress of concrete firstly reduced but then augmented. The modified constitutive model could well fit the dynamic splitting tensile stress-strain curves of concrete under different lateral pressures. The fitting parameter c of the upward segment of the stress-strain curve is affected by both strain rate and lateral pressure, while parameters A_T and B_T of the downward segment mainly depend on test conditions. Comparisons with data obtained by other scholars reveal that the modified model is of good suitability.
引文
[1] LV T H, CHEN X W. Analysis on the Waveform Features of the Split Hopkinson Pressure Bar Tests of Plain Concrete Specimen[J]. International Journal of Impact Engineering, 2017, 103(5):107-123.
[2] ERZAR B, FORQUIN P. Analysis and Modelling of the Cohesion Strength of Concrete at High Strain-rates[J]. International Journal of Solids and Structures, 2014, 51(14):2559-2574.
[3] FENG K N, DONG R, ZHU P, et al. Discussion: Effect of Strain Rate on Splitting Tensile Strength of Geopolymer Concrete[J]. Magazine of Concrete Research, 2014, 66(16):825-835.
[4] 吴彬,胡伟华,唐克静. 应力空间下混凝土动态劈拉损伤演化方程及损伤界点确定[J]. 长江科学院院报, 2016, 33(8):125-129.
[5] 王国盛, 路德春, 李萌. 静动载荷组合下混凝土率效应机理及强度准则[J]. 力学学报, 2017, 49(3):940-952.
[6] 胡伟华,吴彬,彭刚,等. 基于声发射技术的混凝土动态劈拉试验研究[J]. 长江科学院院报, 2015, 32(8):131-134.
[7] 王孝政,刘博文,杨乃鑫,等. 不同应变速率下混凝土劈拉性能试验研究[J]. 工业建筑, 2017, 47(5):107-110.
[8] 邹三兵,胡伟华,黄仕超,等. 基于声发射参数的不同级配混凝土动态劈拉试验研究[J]. 长江科学院院报, 2015, 32(10):111-115.
[9] 邹三兵,杨乃鑫,罗曦,等. 基于声发射的自然与饱水状态混凝土动态劈拉特性对比[J]. 长江科学院院报, 2016, 33(3):141-146.
[10] 梁辉, 邹荣华, 陈学强, 等. 基于Weibull统计理论的混凝土率型损伤本构模型[J]. 长江科学院院报, 2016, 33(2):111-114.
[11] 刘康华. 受损混凝土动态力学性能试验研究[D]. 杭州:浙江大学, 2016.
[12] GB/T 50081—2002,普通混凝土力学性能试验方法标准[S]. 北京: 中国建筑工业出版社, 2002.
[13] DL/T 5368—2007,水电水利工程岩石试验规程[S]. 北京: 中国电力出版社, 2007.
[14] 过镇海. 钢筋混凝土原理[M]. 北京: 清华大学出版社, 2013.
[15] MAZARS J. Sequentially Linear Analysis of Structures with Stochastic Material Properties[M]. Switzerland: Springer International Publishing, 2014.
[16] 梁辉, 彭刚, 胡伟华, 等. 饱和混凝土劈拉试验动态特性研究[J]. 混凝土, 2015, (5):14-17.
[17] 贺誉. 混凝土劈拉特性的率效应研究[D]. 宜昌:三峡大学, 2014.
[18] 陈育志,王瑶,陈徐东.不同应变率对混凝土轴拉全曲线影响的试验研究[J].建筑结构,2015,45(22):71-74.
[2] ERZAR B, FORQUIN P. Analysis and Modelling of the Cohesion Strength of Concrete at High Strain-rates[J]. International Journal of Solids and Structures, 2014, 51(14):2559-2574.
[3] FENG K N, DONG R, ZHU P, et al. Discussion: Effect of Strain Rate on Splitting Tensile Strength of Geopolymer Concrete[J]. Magazine of Concrete Research, 2014, 66(16):825-835.
[4] 吴彬,胡伟华,唐克静. 应力空间下混凝土动态劈拉损伤演化方程及损伤界点确定[J]. 长江科学院院报, 2016, 33(8):125-129.
[5] 王国盛, 路德春, 李萌. 静动载荷组合下混凝土率效应机理及强度准则[J]. 力学学报, 2017, 49(3):940-952.
[6] 胡伟华,吴彬,彭刚,等. 基于声发射技术的混凝土动态劈拉试验研究[J]. 长江科学院院报, 2015, 32(8):131-134.
[7] 王孝政,刘博文,杨乃鑫,等. 不同应变速率下混凝土劈拉性能试验研究[J]. 工业建筑, 2017, 47(5):107-110.
[8] 邹三兵,胡伟华,黄仕超,等. 基于声发射参数的不同级配混凝土动态劈拉试验研究[J]. 长江科学院院报, 2015, 32(10):111-115.
[9] 邹三兵,杨乃鑫,罗曦,等. 基于声发射的自然与饱水状态混凝土动态劈拉特性对比[J]. 长江科学院院报, 2016, 33(3):141-146.
[10] 梁辉, 邹荣华, 陈学强, 等. 基于Weibull统计理论的混凝土率型损伤本构模型[J]. 长江科学院院报, 2016, 33(2):111-114.
[11] 刘康华. 受损混凝土动态力学性能试验研究[D]. 杭州:浙江大学, 2016.
[12] GB/T 50081—2002,普通混凝土力学性能试验方法标准[S]. 北京: 中国建筑工业出版社, 2002.
[13] DL/T 5368—2007,水电水利工程岩石试验规程[S]. 北京: 中国电力出版社, 2007.
[14] 过镇海. 钢筋混凝土原理[M]. 北京: 清华大学出版社, 2013.
[15] MAZARS J. Sequentially Linear Analysis of Structures with Stochastic Material Properties[M]. Switzerland: Springer International Publishing, 2014.
[16] 梁辉, 彭刚, 胡伟华, 等. 饱和混凝土劈拉试验动态特性研究[J]. 混凝土, 2015, (5):14-17.
[17] 贺誉. 混凝土劈拉特性的率效应研究[D]. 宜昌:三峡大学, 2014.
[18] 陈育志,王瑶,陈徐东.不同应变率对混凝土轴拉全曲线影响的试验研究[J].建筑结构,2015,45(22):71-74.