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针对预应力混凝土(PC)框架节点抗剪强度合理计算模型的缺乏,建立了一个显式考虑预应力效应的改进拉压杆模型。依据Kupfer-Gerstle双向拉压强度准则,考虑了节点核心区混凝土软化效应,并基于此准则推导了一个简便实用的受剪承载力预测公式。通过对文献中21组内、外节点进行分析,得到试验值与模型预测结果的平均比值为1.14,离散系数为0.139,表明本文公式预测结果较精确、连续且偏于安全,而且还优于《混凝土结构设计规范》(GB 50010—2010)中的设计方法,可用于有、无粘结PC框架节点的抗震设计。
Aiming at the lack of reasonable calculation model of shear strength of prestressed concrete (PC) frame joints, an improved tension and compression rod model with prestressing effect was established. Based on the Kupfer-Gerstle criterion of biaxial tension and compression strength, the softening effect of concrete in the core of a node is considered. Based on this criterion, a simple and practical prediction formula of shear capacity is deduced. Through analyzing the inner and outer nodes of 21 groups in the literature, the average ratio between the experimental value and the predicted result of the model is 1.14 and the discrete coefficient is 0.139, which shows that the forecasting result of this paper is more accurate, continuous and biased to safety, Design Method for Design of Concrete Structures "(GB 50010-2010) can be used for the seismic design of joints with and without PC frame.