钢纤维聚合物高强混凝土的温度疲劳性能

Thermal Fatigue Performance of Steel Fiber-Polymer Reinforced High-Strength Concrete

为了探明一种可应用于大跨度桥梁结构的新型纤维混凝土———钢纤维聚合物高强混凝土(SPHC)的温度疲劳性能及其耐久性,文中考虑广东省的气候条件,采用理论推导与实验研究相结合的方法,对实际桥梁工程上应用的SPHC的温度疲劳性能进行了探讨,并在室温下和与其静力学性能相近的C60混凝土的温度疲劳性能进行了对比.结果表明:文中提出的计算公式能有效地描述考虑工作环境影响的SPHC材料的疲劳寿命和疲劳极限;与C60混凝土相比,SPHC材料的抗疲劳性能得到了大幅度的提高.

A novel fiber concrete, namely, steel fiber-polymer reinforced high-strength concrete （SPHC）, is used in long-span bridge structures. In order to reveal its thermal fatigue performance and durability, the corresponding experiments and theoretical analyses of the real bridge were conducted based on the climatic conditions in Guangdong province, China. Then, at the room temperature, the thermal fatigue performance of SPHC was compared with that of C60 concrete which has static mechanical properties similar to SPHC. The results show that the proposed calculation formula can effectively describe the fatigue life and fatigue limit of SPHC considering service environment, and that, as compared with C60 concrete, the fatigue resistance of SPHC greatly improves.