为实现对海洋盐雾环境与疲劳交变荷载共同作用的模拟，研制了全国首台海洋环境与动荷载耦合试验设备，该设备包括环境箱和加载装置两部分; 运用该设备对9 个试件进行9 种工况下的耦合试验，主要测定参数包括加载频率及梁的应力水平． 结果表明:在加载频率相同的情况下，应力水平越大，同深度下的氯离子含量越大; 在应力水平为0. 30 及0. 50 的情况下，加载频率越大，扩散系数越大; 受拉区的氯离子传输速度较受压区明显． 由试验数据拟合与由静载经验公式计算得到的混凝土氯离子扩散系数D 值的对比表明，加载频率对构件的氯离子传输存在较大的影响．

In order to simulate the coupling action of salt-spray environment and fatigued alternating load exactly,the national first marine environment-dynamic load coupling test equipment,which consists of a loading device and an environmental cabinet,was developed.Then,a series of experiments were carried out on nine reinforced concrete ( RC) beams under nine kinds of working conditions to test the parameters including loading frequency and beam's stress level.Experimental results show that ( 1) at the same loading frequency and depth,the greater the stress is,the larger the content of chloride ions is; ( 2) in a stress level of 0. 30 or 0. 50,greater loading frequency may result in larger diffusion coefficient; and ( 3) the penetration of chloride ions in the tensile area is more evident than that in the compressive area.From the comparison of the tested chloride diffusion coefficient D values of concrete with the ones calculated by the empirical formula for static load,it is found that loading frequency has an obvious influence on the penetration of chloride ions of the beam.