用应力变化弹性模量预测钢筋混凝土梁的瞬时挠度

Eray Özbek
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摘要

本文讨论了钢筋混凝土梁的瞬时挠度计算及其与试验结果的一致性。为此,共测试了6根低、中、高配筋率的t梁,然后将挠度行为与著名的布兰森(1965)和比肖夫(2005)方法进行了比较。虽然这两种方法都可以通过使用恒定弹性模量来获得低配筋在使用荷载下的接近结果,但它们都低估了中等和高配筋梁的挠度。因此,在随后的分析中也考虑了混凝土随应力变化的非线性行为。结果表明,该方法可以非常准确地预测试验变形,特别是在服役载荷水平上。
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Prediction of Immediate Deflections for RC Beams Using Stress-varying Modulus of Elasticity
This paper discusses the immediate deflection calculation of reinforced concrete beams and their consistency with the experimental results. For this purpose, a total of six T-beams with low, medium, and high reinforcement ratios were tested and then, deflection behavior was compared with the well-known Branson (1965) and Bischoff (2005) approaches. Although both approaches could yield close results for the low reinforcement at service loads by using a constant modulus of elasticity, they underestimated the deflections of medium and highly reinforced beams. Thus, the nonlinear behavior of concrete that changes with stress was also considered in the subsequent analyzes. As a result, the developed new approach could predict the experimental deformations very accurately, especially at the level of service loads.
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