预制混凝土管片是目前地铁盾构隧道最常用的衬砌结构形式,为了更好地发挥钢筋钢纤维混凝土盾构管片的优点,得到准确的钢筋钢纤维混凝土盾构管片裂缝宽度计算方法,设计4组18根钢纤维混凝土梁试验方案,开展了试验数据与有限元软件ABAQUS计算分析。(1)通过压弯梁和纯弯梁构件试验得到数据,提出钢筋钢纤维混凝土纯弯及大偏心受压构件裂缝宽度计算方法;(2)通过有限元分析钢纤维掺量及配筋率变化对裂缝宽度的影响,钢纤维掺量增大时,钢纤维混凝土抗拉强度逐渐增加,构件裂缝宽度逐渐减小,配筋率增大时,钢筋达到屈服强度时对应的荷载也逐渐增加,裂缝宽度逐渐减小;(3)通过管片裂缝宽度实测试验,本文提出公式与《Model Code》计算得到的裂缝宽度与管片试验结果相对接近,平均值相差分别为56%、50%;(4)提出的裂缝宽度计算方法有效考虑钢纤维掺量、配筋率对裂缝宽度的影响,计算结果更为准确,可以有效评价C50钢筋钢纤维混凝土盾构管片裂缝宽度计算。
Precast concrete segment is the most commonly used lining structure form of subway shield tunnel. In order to give full play to the advantages of reinforced steel fiber concrete shield segments and obtain an accurate calculation method of crack width, four groups of 18 steel fiber reinforced concrete beam test schemes were designed. Based on the experimental data and the finite element analysis of ABAQUS, the research results show that: (1)Based on the data obtained from the test of bending beam and pure bending beam, the calculation method of crack width of reinforced steel fiber reinforced concrete pure bending and large eccentric compression members is proposed. (2)The influence of steel fiber content and reinforcement ratio on crack width is analyzed by finite element analysis. When the steel fiber content increases, the tensile strength of steel fiber reinforced concrete increases gradually, and the crack width of the component decreases gradually. When the reinforcement ratio increases, the corresponding load when the steel bar reaches the yield strength increases gradually, and the crack width decreases gradually. (3)Through the measured test of shield segment crack width,the crack width calculated by the formula and the Model Code is relatively close to the segment test results, and the average difference is 56% and 50% respectively. (4)The proposed crack width calculation method effectively considers the influence of steel fiber content and reinforcement ratio on crack width. The calculation results are more accurate and can effectively evaluate the crack width calculation of C50 steel fiber reinforced concrete shield segment.
[1] 梁宁慧,游秀菲,兰菲,等.玄武岩粗聚丙烯纤维钢筋混凝土管力学性能[J]. 地下空间与工程学报,2022,18(4):1177-1187, 1198. (Liang Ninghui, You Xiufei, Lan Fei, et al. Mechanical properties of basalt-coarse polypropylene fiber reinforced concrete pipe [J]. Chinese Journal of Underground Space and Engineering, 2022,18 (4): 1177-1187, 1198. (in Chinese))
[2] 牛方义,陈曦,穆树怀,等.考虑钢纤维分布的SFRS抗压特性[J]. 地下空间与工程学报,2022,18(2):487-494.(Niu Fangyi, Chen Xi, Mu Shuhuai, et al. Compressive behavior of SFRS considering the distribution of steel fibers [J]. Chinese Journal of Underground Space and Engineering, 2022,18 (2): 487-494. (in Chinese))
[3] 齐明山,柳献.纤维混凝土盾构管片力学性能试验研究[J]. 地下空间与工程学报,2019,15(增1):55-60.(Qi Mingshan, Liu Xian. A full-scale experimental study on bearing capacity of fiber reinforced concrete segments [J]. Chinese Journal of Underground Space and Engineering, 2019,15 (Supp. 1): 55-60. (in Chinese))
[4] 杨碧成.纤维混凝土早期塑性开裂试验及其阻裂机理研究[D].大连:大连理工大学,2017. (Yang Bicheng. Experimental study and mechanism of cracking resistanceresearch on the early plastic cracking of fiber reinforced concrete [D]. Dalian: Dalian University of Technology,2017. (in Chinese))
[5] 李瑞尧.钢筋钢纤维混凝土管片阻裂性能及裂缝宽度计算方法研究[D].成都:西南交通大学,2020. (Li Ruiyao. Research on performance of crack arresting and calculation method of crack width steel fiber reinforcement concrete segment [D]. Chengdu: Southwest Jiaotong University,2020. (in Chinese))
[6] 郑海波. 钢纤维-剑麻纤维-纳米纤维素多尺度增强混凝土力学性能和早期收缩抗裂性能研究[D].大连:大连理工大学,2022. (Zheng Haibo. Mechanical properties, early age shrinkage and cracking behavior of multi-scale fiber reinforced concrete with steel fiber, sisal fiber and nanofibrillated cellulose [D].Dalian: Dalian University of Technology, 2022. (in Chinese))
[7] 潘慧敏,马云朝.钢纤维混凝土抗冲击性能及其阻裂增韧机理[J]. 建筑材料学报,2017,20(6):956-961. (Pan Huimin, Ma Yunchao. Impact resistance of steel fiber reinforced concrete and its mechanism of crack resistance and toughening [J]. Journal of Building Materials, 2017,20(6): 956-961. (in Chinese))
[8] 张伟.钢纤维阻裂效应研究及其在盾构管设计中的应用[D].成都:西南交通大学,2007. (Zhang Wei. The study on steel fiber's effect of crack resistance and it's application in shield segment [D]. Chengdu: Southwest Jiaotong University, 2007. (in Chinese))
[9] Chu S H, Kwan A. Crack mitigation utilizing enhanced bond of rebars in SFRC[J]. Structures,2021,33: 4141-4147.
[10] Gong C J, Ding W Q, Mosalam M K, et al. Comparison of the structural behavior of reinforced concrete and steel fiber reinforced concrete tunnel segmental joints[J]. Tunnelling and Underground Space Technology, 2017,68: 38-57.
[11] 王志杰,徐海岩,李志业,等.钢纤维混凝土裂缝宽度影响系数试验探究[J]. 铁道工程学报,2019,36(7):81-86. (Wang Zhijie, Xu Haiyan, Li Zhiye, et al. Experimental research on the influence factor of crack width of steel fiber reinforced concrete [J]. Journal of Railway Engineering Society, 2019,36 (7): 81-86. (in Chinese))
[12] 夏冬桃,颜帅,付敏.基于STM理论钢纤维混凝土深受弯构件裂缝宽度试验研究[J]. 混凝土,2021,375(1):135-138, 142. (Xia Dongtao, Yan Shuai, Fu Min. Experimental and calculation of crack width of SF reinforced deep flexural members based on the STM theory [J]. Concrete, 2021, 375 (1): 135-138, 142. (in Chinese))
[13] 曹国栋,周佳媚,高波,等.钢纤维混凝土裂缝宽度计算方法综述[J]. 铁道科学与工程学报,2017,14(9):1951-1958. (Cao Guodong, Zhou Jiamei, Gao Bo, et al. Comparison on crack width calculation of steel fibre reinforced concrete [J]. Journal of Railway Science and Engineering, 2017,14 (9): 1951-1958. (in Chinese))
[14] 中国工程建设标准化协会.纤维混凝土结构技术规程(CECS 38: 2004)[S].北京:中国计划出版社,2004. (China Association for Engineering Construction Standardization. Technical specification for fiber reinforced concrete structures[S]. Beijing: China Planning Press, 2004. (in Chinese))
[15] 中华人民共和国住房和城乡建设部. 混凝土结构设计规范(GB50010—2010)[S].北京:中国建筑工业出版社, 2011. (Ministry of Housing and Urban-Rural Development of the People 's Republic of China. Code for Design of Concrete Structures[S]. Beijing: China Building Industry Press, 2011. (in Chinese))
[16] 黄承逵,赵国藩,王志杰. 钢筋钢纤维混凝土受弯构件裂缝宽度计算方法[J]. 大连理工大学学报, 1993,33(5): 558-565. (Huang Chengkui, Zhao Guofan, Wang Zhijie. Calculating methods of crack width of reinforced concrete beam with steel bars and fibers [J]. Journal of Dalian University of Technology, 1993,33(5): 558-565. (in Chinese))
[17] 高丹盈,陈刚, Hadi Muhammad Najib Sadraddin,等. 钢筋与钢纤维混凝土的黏结-滑移性能及其关系模型[J]. 建筑结构学报,2015, 36(7): 132-139. (Gao Danying, Chen Gang, Hadi Muhammad Najib Sadraddin, et al. Bond-slip behavior and constitutive model between rebar and steel fibre reinforced concrete [J]. Journal of Building Structures, 2015,36 (7): 132-139. (in Chinese))
[18] Wu D, Gao B, Shen Y S, et al. Damage evolution of tunnel portal during the longitudinal propagation of Rayleigh waves[J]. Natural Hazards,2015, 75(3): 2519-2543.
[19] 徐成. 无筋钢纤维混凝土管片裂缝发展及正截面设计方法研究[D].成都:西南交通大学,2021. (Xu Cheng. Research on crack development and normal section design method of unreinforced steel fiber reinforced concrete segment[D]. Chengdu: Southwest Jiaotong University, 2021. (in Chinese))
[20] International Federation for Structural Concrete. fib Model Code for Concrete Structures[S]. Switzerland: International Federation for Structural Concrete, 2010.
