直墙前承台结构总上托力试验研究

Test of total uplift force on platform structure in front of straight wall

为了研究直墙前承台所受总上托力,采用物理模型试验,研究不规则波作用下总上托力时空分布特征和峰值统计分布情况,分析波高、相对波长、相对板宽和相对超高等因素与总上托力的关系。结果表明,相对超高Δh/Hs>-0.5时最大总上托力和最大冲击压强同时发生;总上托力的峰值统计分布符合三参数威布尔分布;总上托力随相对超高的变化近似呈正态分布,并在Δh/Hs=0.2附近出现极值;建议工程设计时尽量避免将承台底面布置在静水面附近,宜将承台底面布置在水面以下一半波高的位置。

About the problem of total uplift force on platform in front of straight wall, this paper studies the spatial and temporal distribution characteristics and the statistical distribution of total uplift peak value under the action of irregular waves by using physical model test, and analyzes the relationship of the factors of wave height, relative wavelength, relative platform width, relative superelevation with total uplift force. The results show that, when Δh/Hs>-0.5,the maximum total uplift force and the maximum impact pressure occur at the same time.The statistical distribution of total uplift peak value conforms to the three parameters Weibull distribution. The change of total uplift force with relative superelevation is approximately normal distribution, and extreme value occurs near Δh/Hs=0.2. It is suggested that in engineering design, the bottom of the platform should be arranged in the position of half wave height below the water surface rather than near the static water surface.