Flexural Performance of Composite Bamboo-Concrete Beams
-
摘要: 为了研究竹-混凝土组合梁的组合效率及剪力连接件的影响,进行了3根竹-混凝土组合梁和1根对比竹梁的试验,组合梁的剪力连接件形式分别为销栓型、凹槽型和凹槽-销栓型.研究结果表明:销栓型连接件竹-混凝土组合梁发生底面竹纤维受拉断裂的破坏,凹槽型组合梁和凹槽-销栓型组合梁发生凹槽底部水平位置处竹材的纵向剪切破坏;与竹梁相比,竹-混凝土组合梁在跨中挠度为跨度1/250时的荷载提高了3.18~3.74倍,等效截面刚度为刚性连接组合梁截面刚度的70%;凹槽型连接件和凹槽-销栓型连接件的组合梁,界面滑移小于1.2 mm,荷载挠度曲线呈线性,连接件表现出刚性连接性能.Abstract: Three bamboo-concrete composite beams and one companion bamboo beam were tested to investigate the composite efficiency and the effects of shear connectors on bamboo-concrete composite beams. The shear connectors of these composite beams consisted of dowels, notches or notch-dowels. The results indicate that the composite beams connected with dowels fail owing to the tensile fracture of the bottom-most bamboo fiber. Furthermore, the composite beams connected with notches or notch-dowels fail owing to the shear connectors. The longitudinal shear failure occurred in the bamboo along the horizontal line located at the bottom of the notches. Compared to the companion bamboo beam, the load corresponding to the displacement of the 1/250 span of the bamboo-concrete composite beam increases by 3.18 to 3.74 times and the sectional stiffness is significantly enhanced. The effective sectional stiffness of these composite beams reaches up to 70% of the sectional stiffness of the full composite beams. For the composite beams connected with notches or notch-dowels, the interfacial slip is smaller than 1.2 mm, the load-deflection relationship is linear, and the connectors exhibit the performance of a rigid connection.
-
Key words:
- bamboo /
- composite structures /
- concrete /
- beams /
- shear connectors /
- flexural characteristics
-
DIRK E, ALIREZA J, FELIX H, et al. Process-controlled optimization of the tensile strength of bamboo fiber composites for structural applications[J]. Composites Part B:Engineering, 2014, 67(12):125-131. WEI Yang, JI Xuewei, DUAN Maojun, et al. Flexural performance of bamboo scrimber beams strengthened with fiber-reinforced polymer[J]. Construction and Building Materials, 2017, 142(7):66-82. XIAO Yan, ZHOU Quan, SHAN Bo. Design and construction of modern bamboo bridges[J]. Journal of Bridge Engineering, 2010, 15(5):533-541. 魏洋,吕清芳,张齐升,等. 现代竹结构抗震安居房的设计与施工[J]. 施工技术,2009, 38(11):52-55. WEI Yang, LÜ Qingfang, ZHANG Qisheng, et al. Design and construction of the modern bamboo anti-seismic living room[J].Construction Technology, 2009, 38(11):52-55. 魏洋,蒋身学,吕清芳,等. 新型竹梁抗弯性能试验研究[J]. 建筑结构,2010,40(1):88-91. WEI Yang, JIANG Shenxue, LÜ Qingfang, et al. Experimental study on flexural performance of bamboo beams[J]. Building Structure, 2010, 40(1):88-91. 魏洋,骆雪妮,周梦倩. 纤维增强竹梁受弯力学性能研究[J]. 南京林业大学学报:自然科学版,2014,28(2):11-15. WEI Yang, LUO Xueni, ZHOU Mengqian. Study on flexural mechanical performance of bamboo beams reinforced with FRP[J]. Journal of Nanjing Forestry University:Natural Sciences Edition, 2014, 28(2):11-15. 魏洋,王晓伟,李国芬. 配筋重组竹受弯试件力学性能试验[J]. 复合材料学报,2014,31(4):1030-1036. WEI Yang, WANG Xiaowei, LI Guofen. Experimental study on mechanical properties of bamboo scrimber flexural members reinforced with bars[J]. Acta Materiae Compositae Sinica, 2014, 31(4):1030-1036. WEI Y, ZHOU M Q, CHEN D J. Flexural behavior of glulam bamboo beams reinforced with near surface mounted steel bars[J]. Materials Research Innovations, 2015, 19(Sup.1):98-103. LI Yunshun, SHAN Wei, SHEN Huangying, et al. Bending resistance of I-section bamboo-steel composite beams utilizing adhesive bonding[J]. Thin-Walled Structures, 2015, 89(4):17-24. LI Y S, SHEN H Y, SHAN W, et al. Flexural behavior of lightweight bamboo-steel composite slabs[J]. Thin-Walled Structures, 2012, 53(2):83-90. 祝兵,王学伟. 考虑横向预应力效应的钢-混组合梁桥PBL剪力键试验研究[J]. 西南交通大学学报,2016,51(4):621-631. ZHU Bing, WANG Xuewei. Experimental study on PBL shear connectors of steel-concrete composite bridge considering transverse prestressing[J]. Journal of Southwest Jiaotong University, 2016, 51(4):621-631. 李龙起,周东华,廖文远,等. 腹板开洞钢-混凝土连续组合梁受剪性能试验研究[J]. 西南交通大学学报,2015,50(4):648-655. LI Longqi, ZHOU Donghua, LIAO Wenyuan, et al. Experimental study on shear bearing behavior of continuous steel-concrete composite beams with web openings[J]. Journal of Southwest Jiaotong University, 2015, 50(4):648-655. 操礼林,石启印,王震,等. 高强U形外包钢-混凝土组合梁受弯性能[J]. 西南交通大学学报,2014,49(1):72-78. CAO Lilin, SHI Qiyin, WANG Zhen, et al. Bending performances of high-strength steel-encased composite beams[J]. Journal of Southwest Jiaotong University, 2014, 49(1):72-78. ASTM Standards. ASTM D143-09 Standard test methods for small clear specimens of timber[S].:ASTM International, 2000. DIAS A M P G, LOPES S M R, KUILEN J W G V D, et al. Load-carrying capacity of timber-concrete joints with dowel-type fasteners[J]. Journal of Structural Engineering, 2007, 133(5):720-727. GIURIANI E, MARINI A, GELFI P. Stud shear connection design for composite concrete slab and wood beams[J]. Journal of Structural Engineering, 2002, 128(12):1544-1550. GUTKOWSKI R, BROWN K, SHIGIDI A, et al. Investigation of notched composite wood-concrete connections[J]. Journal of Structural Engineering, 2004, 130(10):1553-1561. YEOH D, FRAGIACOMO M, FRANCESCHI M, et al. Experimental tests of notched and plate connectors for LVL-concrete composite beams[J]. Journal of Structural Engineering, 2011, 137(2):261-269. 中华人民共和国建设部. GB50005-2003木结构设计规范[S]. 北京:中国建筑工业出版社,2003.
点击查看大图
计量
- 文章访问数: 544
- HTML全文浏览量: 81
- PDF下载量: 39
- 被引次数: 0