钢纤维增强自应力混凝土连续叠合梁的弯曲性能

发布时间：2018-04-09 18:30

本文选题：自应力混凝土　切入点：叠合梁　出处：《东北大学学报(自然科学版)》2017年08期

【摘要】：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.
[Abstract]:Based on the excellent crack resistance of steel fiber reinforced self-stressed concrete (SFRC), the steel fiber self-stressed concrete (SFRC) is used as a composite layer to lay on the flange of a two-span continuous T-beam of ordinary concrete. The continuous composite beam is made to study its crack resistance and overall bending performance.The test results show that the steel fiber self-stress concrete composite layer can greatly increase the cracking load and the ultimate deflection in the negative moment region of the continuous T-beam bearing, delay the development speed of the crack in the upper part of the bearing, and improve the bending performance of the continuous beam significantly.A method for calculating the cracking load of continuous composite beams with steel fiber self-stress concrete is established, and the bending behavior of continuous composite beams is simulated by finite element method, and the theoretical values, experimental values and numerical simulation results are in good agreement.It is shown that this method can be used to calculate the cracking load of this kind of bending member.
【作者单位】：吉林大学建设工程学院;
【基金】：国家自然科学基金重点资助项目(41430642);国家自然科学基金青年基金资助项目(51108207) 中国博士后科学基金资助项目(2015M581403) 冻土工程国家重点实验室开放基金资助项目(SKLFSE201514)
【分类号】：U441

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