登录
注册
E-alert
登录
注册
E-alert
Research on Tensile and Shear Performance of Fully-Prefabricated Slabs with UHPC Split-Joints
-
摘要: 超高性能混凝土（UHPC）作为一种高强度、高耐久的水泥基复合材料，可以实现传统混凝土材料难以完成的新型高效全装配楼盖结构。预制板间UHPC连接拼缝的性能直接关系楼盖结构整体受力性能，其核心因素是剪力和拉力的传递机理和受力性能。为明确UHPC拼缝的力学性能，分别进行了4个抗拉试验、7个抗剪试验，研究钢筋搭接长度、抗剪槽构造对拼缝受力性能的影响，分析不同参数下试件的裂缝开展、破坏形态、应变发展规律和荷载-位移曲线。研究结果表明：钢筋搭接长度为12倍直径时，拼缝处纵向受力钢筋抗拉强度、抗剪强度能够充分发挥；抗剪槽构造可以显著提高拼缝的抗剪能力，钢筋搭接长度为8倍直径且配置抗剪槽时可以保证拼缝的抗剪能力大于预制板本体。Abstract: Ultra high performance concrete (UHPC) is a kind of cementitious composite material with high strength and durability, and can achieve a new type of fully-prefabricated floor structure with high construction efficiency that is difficult to construct with traditional concrete materials. The performance of the UHPC joint between prefabricated slabs is directly related to the overall performance of floor, and its critical issues are the transmission mechanism and mechanical properties of shear and tensile forces. In order to clarify the mechanical properties of UHPC joints, four tensile tests and seven shear tests were conducted to explore the effects of rebar lap length and shear groove construction on the mechanical properties of the joint, and to analyze the crack development, damage pattern, strain development law and load-displacement curve of the specimens with different parameters. The research results showed that when the lap length of rebars was 12 times diameter, the tensile strength and shear strength of longitudinal rebars in the joint could be fully developed. In addition, the shear groove could significantly improve the shear capacity of the joint, and the shear resistance of the joint could exceed that of the prefabricated slab with shear groove configuration and 8 rebar lap length of 8 times diameter.
-
Key words:
- prefabricated structure /
- slab split-joint /
- UHPC /
- tensile performance /
- shear performance
-
[1] 邵旭东,邱明红,晏班夫,等. 超高性能混凝土在国内外桥梁工程中的研究与应用进展[J]. 材料导报, 2017, 31(23):33-43. [2] 任亮,方蕈,王凯,等. 超高性能混凝土与水泥基材料界面粘结性研究进展[J]. 硅酸盐通报, 2019, 38(7):2087-2094. [3] 马福栋,邓明科,杨勇. 超高性能混凝土装配整体式框架梁柱节点抗震性能研究[J]. 工程力学, 2021, 38(10):90-102. [4] 韩方玉,刘建忠,刘加平,等. 基于超高性能混凝土的钢筋锚固性能研究[J]. 材料导报, 2019, 33(增刊1):244-248. [5] 邵旭东,刘也萍,邱明红,等. 采用UHPC灌浆材料大口径全灌浆连接套筒接头的性能研究[J]. 土木工程学报, 2020, 53(2):81-91. [6] 龚永智,况锦华,柯福隆,等. UHPC连接的装配式剪力墙节点抗震性能试验[J]. 吉林大学学报(工学版), 2022, 52(10):2367-2375. [7] 冯军骁,郑七振,龙莉波,等. 超高性能混凝土连接的预制梁受弯性能试验研究[J]. 工业建筑, 2017, 47(8):59-65. [8] 谢思昱,郑七振,龙莉波,等. 以UHPC材料连接的装配式框架边节点抗震性能试验研究[J]. 建筑施工, 2016, 38(12):1718-1721. [9] 赵晓艳. 新老混凝土机械连接结合性能研究[D]. 天津:河北工业大学, 2004. [10] 谢慧才,李庚英,熊光晶. 新老混凝土界面粘结力形成机理[J]. 硅酸盐通报, 2003, 22(3):7-10, 18. [11] 韩菊红,赵国藩,张雷顺. 新老混凝土粘结面断裂性能试验研究[J]. 土木工程学报, 2003, 36(6):31-35. [12] 王振领,林拥军,钱永久. 新老混凝土结合面抗剪性能试验研究[J]. 西南交通大学学报, 2005(5):600-604. [13] 陈峰,郑建岚. 自密实混凝土与老混凝土粘结强度的直剪试验研究[J]. 建筑结构学报, 2007, 28(1):59-63. [14] 蔡炜,方海,刘伟庆,等. 纤维增强磷酸盐水泥基复合材料与旧混凝土的黏结性能试验研究[J]. 建筑结构学报, 2020, 41(增刊2):443-450. [15] 张晓光,陈泽赳,刘星,等. 新旧混凝土结合面抗剪性能现场试验研究[J]. 结构工程师, 2010, 26(6):70-75. [16] 靳利娜,王山山,任青文,等. 新老混凝土结合面抗剪性能试验研究[J]. 实验力学, 2014, 29(5):611-619. [17] HYUN-O J, LEE H S, CHO K, et al. Experimental study on shear performance of plain construction joints integrated with ultra-high performance concrete (UHPC)[J]. Construction and Building Materials, 2017:15216-15223. [18] 吴香国,张孝臣. 预制超高性能混凝土修复层与既有混凝土界面黏结短期性能研究[J]. 建筑结构学报, 2018, 39(10):156-163. [19] 龙杰,陈庆,蒋正武. 不同因素对UHPC-普通混凝土黏结强度影响的试验研究[J]. 混凝土与水泥制品, 2019(4):4-8. [20] JIANG H B, SHAO T F, FANG Z C, et al. Shear-friction behavior of grooved construction joints between a precast UHPC girder and a cast-in-place concrete slab[J/OL]. Engineering Structures, 2021, 228[2021-12-11].https://doi.org/10.1016/j.engstruct.2020.111610. [21] 周建庭,胡天祥,杨俊,等. 键槽构造UHPC-NC界面黏结性能试验研究[J]. 材料导报, 2021, 35(16):16050-16057. [22] 马福栋,邓明科,孙宏哲,等. 变形钢筋/超高性能混凝土搭接黏结性能[J]. 复合材料学报, 2021, 38(11):3912-3924. [23] 胡翱翔.超高性能混凝土力学性能研究[D].西安:西安建筑科技大学,2019. -
点击查看大图
计量
- 文章访问数: 119
- HTML全文浏览量: 73
- PDF下载量: 4
- 被引次数: 0
下载:
