性能增强再生混凝土框架中节点地震损伤评估
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摘要
通过对3个足尺性能增强再生混凝土框架中节点进行低周反复加载试验,按照传统延性损伤模型(单参数)、改进的Park-Ang损伤模型(双参数)对其损伤演化与累积进行分析:各试件特征位移等于20 mm时,试件已经出现损伤,但按照延性损伤模型计算结果为负;当特征位移超过100 mm时,改进的Park-Ang损伤模型计算结果表明各试件已经完全破坏,无法继续承载,但试件实际结果却仍表现出一定的承载能力与耗能能力。因而有必要对前述损伤模型进行修正,使其能够适用于性能增强再生混凝土结构之中。基于前述试验结果,针对改进的Park-Ang损伤模型,提出并拟合了纤维项系数、位移项系数和能量项系数3种修正系数,并建立了相应的修正的Park-Ang损伤模型。最后,利用所提出的损伤模型,以HF-RAC2为例进行了损伤指标误差分析,结果表明:平均误差在6%以内,即:所提出双参数损伤模型能够应用于性能增强再生混凝土框架节点地震损伤与评估分析之中。
Three full-scale interior joints of the enhanced recycled aggregate concrete( EC-RAC) frame were tested with low-cyclic loading. Its damage evolution and accumulation were analyzed by traditional Ductile Damage Model( single parameter) and Improved Park-Ang Damage Model( double parameters) : When the characteristic displacement of each specimen reached 20 mm,damage occurred in the specimen,but the calculated results according to the Ductile Damage Model was negative. When the characteristic displacement exceeded 100 mm,the calculated results based on the Improved Park-Ang Damage Model shown that: each specimen had been completely destroyed with no load-carrying capacity. However,it is shown from the test results that they still had a certain loadcarrying and energy-consuming capacity. Therefore,it is necessary to revise the aforementioned damage models for the enhanced recycled aggregate concrete structure. Based on the above experimental results,the fiber term coefficient,displacement term coefficientand energy term coefficient were proposed for the Improved Park-Ang Damage Model. Then,a modified Park-Ang Damage Model was established. Taking specimen HF-RAC2 as an example,the error of the damage index for the model was analyzed. The results show that the average error was within 6%,which means the damage model can be applied to the EC-RAC frame joints for seismic damage evaluation.
Three full-scale interior joints of the enhanced recycled aggregate concrete( EC-RAC) frame were tested with low-cyclic loading. Its damage evolution and accumulation were analyzed by traditional Ductile Damage Model( single parameter) and Improved Park-Ang Damage Model( double parameters) : When the characteristic displacement of each specimen reached 20 mm,damage occurred in the specimen,but the calculated results according to the Ductile Damage Model was negative. When the characteristic displacement exceeded 100 mm,the calculated results based on the Improved Park-Ang Damage Model shown that: each specimen had been completely destroyed with no load-carrying capacity. However,it is shown from the test results that they still had a certain loadcarrying and energy-consuming capacity. Therefore,it is necessary to revise the aforementioned damage models for the enhanced recycled aggregate concrete structure. Based on the above experimental results,the fiber term coefficient,displacement term coefficientand energy term coefficient were proposed for the Improved Park-Ang Damage Model. Then,a modified Park-Ang Damage Model was established. Taking specimen HF-RAC2 as an example,the error of the damage index for the model was analyzed. The results show that the average error was within 6%,which means the damage model can be applied to the EC-RAC frame joints for seismic damage evaluation.
引文
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[11]曾磊,许成祥,郑山锁.型钢高强高性能混凝土框架节点地震损伤模型[J].工程抗震与加固改造,2013,35(2):56-61.ZENG Lei,XU Chengxiang,ZHENG Shansuo. Seismic damage model of steel reinforced high strength and high performance concrete frame joints[J]. Earthquake Resistant Engineering and Retrofitting,2013,35(2):56-61.(in Chinese)
[12] POWELL G H,ALLAHABADI R. Seismic damage prediction by deterministic method:concept and procedures[J]. Earthquake Engineering and Structural Dynamics,1988,16:719-734.
[13]牛荻涛,任利杰.改进的钢筋混凝土结构双参数地震破坏模型[J].地震工程与工程振动,1996(16):44-54.NIU ditao,REN lijie. A modified seismic damage model with double variables for reinforced concrete structures[J]. Journal of Earthquake Engineering and Engineering Vibration,1996(16):44-54.(in Chinese)
[14]傅剑平,王敏,白绍良.对用于钢筋混凝土结构的Park-Ang双参数破坏准则的识别和修正[J].地震工程与工程振动,2005,25(5):75-81.FU Jianping,WANG Min,BAI Shaoliang. Identification and modification of the Park-Ang criterion for failure of RC structures[J]. Journal of Earthquake Engineering and Engineering Vibration,2005,25(5):75-81.(in Chinese)
[2] GOMEZ S,JOSE M V. Porosity of recycled concrete with substitution of recycled concrete aggregate[J]. Cement and Concrete Research,2012,42(8):1301-1311.
[3]肖建庄.再生混凝土[M].北京:中国建筑工业出版社,2008.XIAO Jianzhuang. Recycled Concrete[M]. Beijing:China Architecture&Building Press,2008.(in Chinese)
[4]曹万林,张勇波,董宏英,等.再生混凝土结构抗震性能研究进展与评述[J].地震工程与工程振动,2013,33(6):63-73.CAO Wanlin,ZHANG Yongbo,DONG Hongying,et al. A review of mechanical properties and structural behavior of recycled concrete[J]. Journal of Earthquake Engineering and Engineering Vibration,2013,33(6):63-73.(in Chinese)
[5]陈宗平,徐金俊,郑华海等.再生混凝土基本力学性能试验及应力应变本构关系[J].建筑材料学报,2013,16(01):24-32.CHEN Zongping,XU Jinjun,ZHENG Huahai,et al. Basic mechanical properties test and stress-strain constitutive relations of recycled coarse aggregate concrete[J]. Journal of Building Materials,2013,16(01):24-32.(in Chinese)
[6]曹万林,尹海鹏,张建伟,等.再生混凝土框架结构抗震性能试验研究[J].北京工业大学学报(自然科学版),2011,37(2):191-198.CAO Wanlin,YIN Haipeng,ZHANG Jianwei. Behavior experiment of recycled concrete frame structures[J]. Journal of Beijing University of Technology,2011,37(2):191-198.(in Chinese)
[7] PARK Y J,ANG H S. Mechanistic seismic damage model for reinforced concrete[J]. Journal of Structure Engineering,ASCE,1985,111(4):722-739.
[8] GB/T50081-2002.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,2003.GB/T50081-2002. Standard Test Method for Mechanical Properties of Ordinary Concrete[S]. Beijing:China Architecture&Building Press,2003.(in Chinese)
[9] GB/T 24335-2009建筑地震破坏等级划分标准[S].北京:中国建筑工业出版,2009.GB/T 24335-2009 Classification of Earthquake Damage to Buildings and Special Structures[S]. Beijing:China Architecture&Building Press,2009.(in Chinese)
[10] REIHORN A M,KUNNTH S K,MANDER J B. Seismic Design of Structures for Damage Control,Nonlinear Seismic Analysis and Design of Reinforced Concrete Buildings[M]. Elsevier Applied Science,1992:63-76.
[11]曾磊,许成祥,郑山锁.型钢高强高性能混凝土框架节点地震损伤模型[J].工程抗震与加固改造,2013,35(2):56-61.ZENG Lei,XU Chengxiang,ZHENG Shansuo. Seismic damage model of steel reinforced high strength and high performance concrete frame joints[J]. Earthquake Resistant Engineering and Retrofitting,2013,35(2):56-61.(in Chinese)
[12] POWELL G H,ALLAHABADI R. Seismic damage prediction by deterministic method:concept and procedures[J]. Earthquake Engineering and Structural Dynamics,1988,16:719-734.
[13]牛荻涛,任利杰.改进的钢筋混凝土结构双参数地震破坏模型[J].地震工程与工程振动,1996(16):44-54.NIU ditao,REN lijie. A modified seismic damage model with double variables for reinforced concrete structures[J]. Journal of Earthquake Engineering and Engineering Vibration,1996(16):44-54.(in Chinese)
[14]傅剑平,王敏,白绍良.对用于钢筋混凝土结构的Park-Ang双参数破坏准则的识别和修正[J].地震工程与工程振动,2005,25(5):75-81.FU Jianping,WANG Min,BAI Shaoliang. Identification and modification of the Park-Ang criterion for failure of RC structures[J]. Journal of Earthquake Engineering and Engineering Vibration,2005,25(5):75-81.(in Chinese)