X形配筋增強高強鋼筋異形柱邊節點抗震性能試驗研究

戎賢　王勝男　張健新

摘要：

通過對核心區應用X形配筋增強的高強鋼筋異形柱邊節點和同等條件下未被增強的高強鋼筋異形柱邊節點進行擬靜力試驗研究，對比分析異形柱邊節點的破壞特征、滯回曲線、承載能力、位移及延性、剛度退化、耗能能力等抗震性能指標。研究結果表明，配置HRB500高強鋼筋異形柱邊節點比配置600 MPa級的邊節點承載能低，但滯回性能好，變形能力強，剛度退化推遲，耗能能力強；在核心區加入X形配筋，均可以改善高強鋼筋異形柱邊節點的破壞特征，使邊節點抗剪能力、變形能力、耗能能力增強，剛度退化推遲，提高異形柱邊節點抗震性能，配置HRB500高強鋼筋的試件核心區應用X形配筋加強后抗震性能提高效果更好。

關鍵詞：

高強鋼筋；邊節點；異形柱；X形配筋；抗震性能

中圖分類號：TU375.4

文獻標志碼：A文章編號：16744764（2017）02010006

Abstract：

The exterior joints of specially shaped columns with highstrength reinforcement， and with or without Xshaped reinforcement were tested under low cyclic loading. The damage characteristic， hysteretic curve， bearing capacity， displacement， ductility， stiffness degradation and energy dissipation capacity were compared. The results showed that for the exterior joints of specially shaped columns， the bearing capacity of the HRB500 joint was lower， but the hysteretic behavior， deformability， energy dissipation capacity were increased， the stiffness degradation was postponed. When Xshaped highstrength reinforcement added to the joints， the failure characteristics of the joint was improved， the stiffness degradation was postponed， the deformability， shear capability and energy dissipation capacity were increased， the seismic behavior of specially shaped column joints was improved significantly，and the seismic behavior of the HRB500 joint was improved more.

Keywords：

highstrength reinforcement； exterior joint； specially shaped column； Xshaped reinforcement； seismic behavior

相對于普通截面柱結構，異形柱結構體系由于具有節省室內空間、平面布置靈活等特點，可以較好地滿足中國居民的居住要求[12]，學者們做了許多關于異形柱結構體系的各類試驗研究及分析[310] ，中國學者也對異形柱結構進行了大量的研究，戎賢等[11]指出，增大配箍率可以提高異形柱試件的延性，改善其滯回特性。雷敏等[12]提出了T形鋼管混凝土單向偏壓柱承載力的計算方法。同時有學者針對異形柱節點薄弱問題，進行了節點增強的探討。戎賢等[1314]指出，在節點核心區混凝土中加入鋼纖維，可以改善異形柱節點滯回性能。曾磊等[15]提出，提高鋼骨混凝土異形柱鋼梁節點核心區的配箍率，可以提高試件的延性，改善耗能能力。……