高强钢筋混凝土梁变形计算方法的研究

Research on Short-term Deformation of Concrete

摘要:

为推广和应用高强钢筋，同济大学对配置高强钢筋的混凝土梁和预应力钢筋混凝土梁进行了一系列单调加载试验。试验结果表明：新规范GB 50010-2010对配置高强钢筋的混凝土梁在短期刚度计算上是适用的；影响混凝土梁变形性能的主要因素为：初始刚度、配筋率与荷载。在此基础上，本文进一步推导出不仅适用于混凝土梁，也适用于预应力混凝土梁短期变形计算的简化公式。通过对比国内外规范与试验结果表明：建议公式计算精度高、概念清晰、简单实用。

Abstract:

Tests of reinforced concrete (RC) and prestressed reinforced concrete (PRC) beams with 500MPa steel bars were carried out in Tongji University in order to popularize the application of high strength steel bar. The results verified the equations from new code GB 50010-2010 in calculating short term flexural stiffness of concrete beams with high strength steel bars, and indicated that the deformational response of beams was influenced mainly by three parameters including initial elastic flexural stiffness, longitudinal reinforcement ratio and load level. Based on the tests, a simpler unified formula is suggested after theoretical analyses for predicting short term deformation of concrete beams using high strength steel bars. Comparison with calculations from different codes at home and abroad exhibits that the suggested formula is precise and practical for both RC and PRC beams. Keyword：cold-rolled ribbed steel wires; concrete slab; static load test; flexural behavior