基于高延性工程水泥基复合材料的无伸缩缝桥面连续构造优化试验研究  

Experimental Research on Optimization of Continuous Deck Structures Without Expansion Devices Based on Engineered Cementitious Composites

作　　者：徐召 马雪媛 郭亚唯 朱尧于 XU Zhao;MA Xueyuan;GUO Yawei;ZHU Yaoyu(Shandong Provincial Communications Planning and Design Institute Group Co.,Ltd.,Jinan 250101,China;Shandong Provincial Key Laboratory of High-Performance Bridge Structure Transportation Industry,Jinan 250101,China;CCCC Highway Bridges National Engineering Research Centre Co.,Ltd.,Beijing 100088,China)

机构地区：[1]山东省交通规划设计院集团有限公司,济南250101 [2]山东省高性能桥梁结构交通运输行业重点实验室,济南250101 [3]中交公路长大桥建设国家工程研究中心有限公司,北京100088

出　　处：《工业建筑》2024年第4期188-194,共7页Industrial Construction

摘　　要：为研究高延性工程水泥基复合材料(ECC)用于桥面连续结构代替传统伸缩装置的受力性能,以后浇槽深度和钢筋有无黏结作为变参数,设计制作了4组高延性ECC桥面连接板缩尺模型构件,开展了弯拉组合工况下的连接板受力性能试验。结果表明:ECC连接板顶面呈现微裂缝多点开裂现象,裂缝宽度处于0.2mm内,ECC材料自身发挥了较好的抗裂性能;增加后浇槽深度能够提升连接板的受力性能,但某种程度上弱化了连接板延性性能,钢筋设置无黏结段能够显著释放钢筋对ECC基体产生的约束作用,继而更好发挥ECC连接板的高延性性能。In order to study the mechanical properties of high-ductility ECC materials instead of conventional expansion devices in continuous bridge deck structures,the depth of the post-cast groove and the presence or absence of bonding of rebars were used as variable parameters,designed and fabricated four sets of high-ductility ECC bridge deck joint plate scaled model members,conducted tests on the mechanical properties of joint plates under combined bending and tension conditions.The results showed that the top surface of the ECC joint plate showed the phenomenon of multi-point cracking with fine cracks,the crack width was within 0.2 mm,the ECC material itself exerted a better crack resistance;increasing the depth of the post-cast groove could improve the mechanical properties of the joint plate,but it weakened the ductility of the joint plate,the unbonded section of the rebars could significantly release the restraining effect of the rebars on the ECC matrix,and then better utilize the high ductility of the ECC joint plate.

关 键 词：ECC 桥面连续结构 裂缝宽度 构造优化 

分 类 号：U443.31[建筑科学—桥梁与隧道工程]