钢纤维增强自应力混凝土连续叠合梁的弯曲性能

摘要

Owing to the excellent crack resistance of steel fiber reinforced self-stressing concrete (SFRSSC for short), the flexural performance and crack resistance of a two-span continuous composite beam with SFRSSC laminated layers were investigated.The experimental results show that the cracking load and the ultimate mid-span deflection of the test beams are increased greatly.Meanwhile, the cracks develop slowly around the support and the flexural behavior of continuous composite beam is improved obviously.Furthermore, a procedure to determine the crack load of SFRSSC continuous composite beams was established and a FEM simulation was given.The theoretical results are in good agreement with the test results and the numerical results, which indicates that the method can evaluate the crack resistance of continuous composite beams.%基于钢纤维自应力混凝土优异的抗裂性能,将其作为叠合层铺筑于普通混凝土两跨连续T梁翼缘,制成连续叠合梁研究其抗裂性能和整体的弯曲性能.试验表明,钢纤维自应力混凝土叠合层可大幅提高连续叠合T梁支座负弯矩区的开裂荷载和跨中极限挠度,延缓支座处上部裂缝的发展速度,显著改善连续梁的弯曲性能.建立了钢纤维自应力混凝土连续叠合梁开裂荷载的计算方法,并对连续叠合梁的弯曲性能进行了有限元模拟;理论值、试验值与数值模拟结果吻合较好,表明该计算方法可用来计算此类弯曲构件的开裂荷载.