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中文摘要：
考虑混凝土开裂后的软化特性和坝体分期施工,采用三维钢筋混凝土非线性有限元法,研究钢衬钢筋混凝土坝后背管在静力作用下的承载性能规律。研究表明：考虑混凝土开裂后的软化特性将减小背管混凝土开裂区的范围,同时也将减小钢材应力,且背管斜直段长度越短,软化作用的有利影响越显著;考虑分期施工增大了背管混凝土的开裂区,提高了钢筋应力,坝基岩体强度参数越低,钢材应力提高值越大。
英文摘要：
With considering tension softening of concrete and stage construction, load-carrying properties of a downstream penstock structure are studied under static load by using three-dimensional nonlinear finite element method of reinforced concrete. The results show that cracking region in concrete wall and stress in steel would be decreased when tension softening of concrete is introduced, the cracking region in concrete wall and stress in steel would be increased when stage construction is introduced, it shows that the favorable result caused by tension softening would be remarkable when the length of straight part of penstock is shorter, and that the influence of stage construction on carrying properties would be increased when the strength parameters of rock is decreased.
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