新型装配式混凝土框架型钢节点试验

针对目前装配式混凝土节点连接复杂、湿连接多等问题，设计了3类（工字型钢、双腹板工字型钢、组合角钢）6个利用型钢连接的预制装配式混凝土梁柱节点，并开展了拟静力试验研究。通过试验现象及数据分析了各节点的破坏形态、抗震性能，研究了焊接连接形式、梁截面尺寸、截面形式对型钢节点力学性能的影响。结果表明:预制梁型钢与梁纵筋采用搭焊或预制板塞焊对节点性能影响不大；与标准现浇混凝土节点相比，工字型钢节点极限承载力显著提高，组合角钢与之相当，双腹板工字型钢略有降低；3类型钢节点均表现出良好的延性及耗能性能，能量耗散系数比现浇标准节点提高1倍以上；3类节点不同的破坏形态验证了提出的通过有意识地弱化节点邻近区域刚度而改善节点抗震性能的装配式节点设计理念。

Experiment on New Section Steel Joints for Prefabricated Concrete Frame

In view of the problems of present prefabricated concrete joints such as complex connection and many wet connections, 3 types (I-type, II-type, combined angel steel) including 6 kinds of prefabricated concrete beam-column joints connected by section steel were designed and quasi static experiments were carried out. Based on the phenomenon and data of tests, the failure modes and seismic performance of joints were analyzed. The influences of welding connection type, section dimension and section shape on mechanical properties were studied. The results indicate that the influences of prefabricated section steel and longitudinal reinforcement by lap welding or prefabricated board plug welding on properties of joints are little. Compared with the standard cast-in-situ joint, the bearing capacity of the I-type joints is much higher, and the L-type one is similar, the II-type one is slightly lower.All the three kinds of shape steel joints present much better ductility and energy dissipation characteristics, the coefficient of energy dissipation of these joints is twice as high as the standard cast-in-situ joint. The failure modes of the three kinds of joints validate that the design idea is beneficial to improve the seismic performance of the joints through weakening the stiffness of the adjacent area of the joint.