钢筋锈蚀条件下混凝土柱有效弹性模量试验研究

Study on the effective elastic modulus of reinforced concrete columns subjected to corrosion and load coupling

通过对16根钢筋混凝土柱进行腐蚀与长期荷载共同作用的长期试验,研究构件在不同配筋率、钢筋锈蚀率及加载龄期下有效弹性模量的变化规律,配筋率分别为1%、2%、3%,钢筋锈蚀率分别为0%、10%、20%,加载龄期分别为7d和28d。研究结果表明:配筋率与加载龄期对钢筋混凝土有效弹性模量都有影响,两种影响具有叠加效应,并且这种叠加效应不只是简单的线性叠加;钢筋锈蚀率越大,钢筋混凝土有效弹性模量越小。在试验研究的同时,还提出了考虑配筋率与钢筋锈蚀率的混凝土柱有效弹性模量计算模型,通过模型计算值与试验值的相对误差对比,验证了本文计算模型的有效性和适用性。

To investigate the development rule of effective elastic modulus of reinforced concrete structures subjected to corrosion and load coupling, a long-term test on 16 reinforced concrete column specimens was carried out. The development rule of effective elastic modulus of specimens under different reinforcement ratio, steel corrosion rate and loading age was studied. The reinforcement ratio is 1%, 2% and 3% respectively, the corrosion rate of reinforcement is 0%, 10% and 20% respectively, and the loading age is 7 days and 28 days respectively. The result shows that both reinforcement ratios and loading ages have impacts on the effective elastic modulus, while effects of these two parameters are superimposed non-linearly. The effective elastic modulus decreased as steel corrosion rates increasing. A computation model of the effective elastic modulus considering effects of reinforcement ratios and steel corrosion rates is deduced by theoretical analysis methods, and its validity and applicability are proved by contrast between the model theoretical values and measured data.