Mechanical behavior of a novel precast beam-to-column connection with U-shaped bars and engineered cementitious composites
Mechanical behavior of a novel precast beam-to-column connection with U-shaped bars and engineered cementitious composites
复制标题
采用 U 形杆和工程水泥复合材料的新型预制梁柱连接的机械性能
DOI：
10.1177/1369433218761139
复制
发表时间：
2018-10-01
影响因子：
2.6
通讯作者：
Yin, Wanyun
中科院分区：
文献类型：
--
作者：
Dong, Bingqing;Lu, Cong;Yin, Wanyun
本文研究了一种新型的预制节点，即从预制柱延伸出的U形筋与预制梁中的纵筋连接。为了改善节点的抗震性能，在节点的核心区引入了高延性混凝土工程水泥基复合材料，作为梁顶和梁端的现浇材料。在试验前，进行了有限元模拟，以确定U形钢筋与梁钢筋之间的合适拼接长度，并评估了所建议的节点的粘结性能。然后进行了整体节点、普通混凝土预制节点和工程水泥基复合材料预制节点的试验研究，分析了节点的破坏模式、滞回特性、刚度退化、延性和耗能等抗震性能。所有三种类型的连接都经历了典型的弯曲破坏，关节区域保持完好。与混凝土连接的负承载力、延性和耗能略低，而与工程水泥基复合材料的连接表现出与整体试件相当的良好性能。建议将后一种连接方式与工程水泥基复合材料结合应用于高地震区。
This article investigates a novel precast connection, with U-shaped bars extending from precast column to connect with the longitudinal bars in precast beams. To improve the seismic behavior of the connection, engineered cementitious composites, one kind of highly ductile concrete, were introduced into the core area of the connection, which also act as the cast-in-place material in the beam top and end. Prior to the test, finite element modeling was conducted to determine the proper splice length between U-shaped bars and beam reinforcements and also to evaluate the bonding performance of the proposed connection. The experimental program was then carried out on a monolithic connection, a precast connection with normal concrete as well as a precast connection with engineered cementitious composite, after which the seismic behaviors of the connections including their failure mode, hysteresis characteristic, stiffness degradation, ductility, and energy dissipation were analyzed. All three types of connections underwent typical flexural failure where the joint area remained intact. The negative carrying capacity, ductility, and energy dissipation were slightly lower for the connection with concrete, while the connection with engineered cementitious composite exhibited satisfactory behavior comparable to monolithic specimens. The latter connection with engineered cementitious composite is therefore suggested to be applied in highly seismic region.