钢连梁预埋端板连接受力性能试验研究

提出了纯锚筋、角钢加抗剪板和锚筋加抗剪板3种用于钢连梁的预埋端板连接构造。其中纯锚筋连接是传统锚固形式，角钢加抗剪板和锚筋加抗剪板则是依据弯剪分离设计方法。通过拟静力试验进行对比，分别考察3种预埋端板连接在弯剪耦合作用下的破坏形式和滞回性能，分析了节点的受力特征和整体破坏发展过程。结果表明，3种预埋端板连接均能满足承载力的需求，其中纯锚筋试件的初始转动刚度最大，而且滞回曲线较为饱满，但竖向滑移较大；角钢加抗剪板试件和锚筋加抗剪板试件受力性能较为一致，但角钢加抗剪板试件中混凝土墙肢的破坏较大，难以修复；锚筋加抗剪板试件滞回曲线较为饱满，预埋端板转动和竖向滑移较小，对连梁传力较为有利，但外侧锚筋拉应力过于集中，一旦发生断裂，承载力下降较快。通过对比试验结果与现行设计公式的计算结果，验证了弯剪分离设计方法的可靠性。

Experimental study on mechanical behavior of anchored end-plate connections for steel coupling beams

Three anchorage details, namely, rebar anchorage, angle steel-shear plate anchorage, and anchor-shear plate anchorage, are proposed for pre-embedded end plate connections for steel coupling beams. The rebar anchorage is a traditional anchoring form, and the angle steel-shear plate form and the anchor-shear plate form are based on the idea of bending and shear separation design. Quasi-static tests are conducted to evaluate the damage patterns and hysteretic behavior of the anchorage connections under combined bending and shear loading. The mechanical characteristics and failure process are analysed for the three specimens.The test results indicate that the three types of anchorage connections are strong enough to sustain the expected maximum force transferred from the coupling beam. The rebar anchorage has the largest stiffness which is helpful to transfer the force from the coupling beam to the reinforced concrete (RC) shear wall. The rebar anchorage also exhibits plump hysteretic curve, suggesting satisfactory energy dissipation capability, but the vertical slippage is relatively large. The mechanical behaviors of the angle steel-shear plate anchorage and the anchor-shear plate anchorage are similar. However, the RC shear wall is damaged more serious in the angle steel-shear plate anchorage than in the anchor-shear plate anchorage. The repair is thus difficult. The anchor-shear plate anchorage exhibits good energy dissipation capacity with small rotation and vertical slippage of the end plate. However, the moment causes significant stress concentration on the anchor rebars. Once the rebars are fractured, the bearing capacity would drop sharply. The test results matches the calculated values using the current design formula which could be used for the design.