College of Civil Engineering and Architecture, Xinjiang University, Urumqi, 830063, China.
Sci Rep. 2023 Apr 1;13(1):5334. doi: 10.1038/s41598-023-32447-1.
A new, precast concrete frame beam-column connection is designed in this research. The connection adopts the assembly mode of the precast column and seam area jointly to maintain the integrity of the joint area and increase the assembly efficiency. Based on the conventional grouting sleeve connection, a disc spring device is constructed on the beam end to improve the ductility of the joint. Ten connecting specimens were tested under low cyclic loads, including two monolithic connections, four ordinary precast connections, and four new precast connections. The test parameters included the joint type and axial pressure ratio, and the difference in the seismic performance was determined by evaluating the failure mode, hysteresis characteristics, stiffness degradation, energy dissipation, and shear deformation of the joint area. Compared to monolithic connections, conventional precast connections display similar hysteresis characteristics. Although their ductility is slightly lower, their bearing capacity is higher. Compared with the previous two connections, the new connection with the built-in disc spring device has superior seismic performance. The axial pressure ratio is a significant aspect in determining the failure mode of the precast connection, and the specimen exhibits less shear damage at a larger axial pressure ratio.
本研究设计了一种新的预制混凝土梁柱连接。该连接采用预制柱和接缝区域的装配方式，以保持节点区域的完整性并提高装配效率。在常规注浆套管连接的基础上，在梁端构造碟簧装置，以提高节点的延性。在低周反复荷载下对十个连接试件进行了测试，包括两个整体连接、四个普通预制连接和四个新预制连接。测试参数包括连接类型和轴压比，通过评估节点区域的破坏模式、滞回特性、刚度退化、耗能和剪切变形来确定抗震性能的差异。与整体连接相比，常规预制连接具有相似的滞回特性。虽然它们的延性略低，但它们的承载能力更高。与前两种连接相比，内置碟簧装置的新型连接具有更好的抗震性能。轴压比是确定预制连接破坏模式的重要因素，在较大的轴压比下，试件的剪切损伤较小。
