Physical modeling of progressive damage and failure of wood-frame coastal residential structures due to surge and wave forces
Physical modeling of progressive damage and failure of wood-frame coastal residential structures due to surge and wave forces
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潮汐力和波浪力引起的木框架沿海住宅结构的渐进损坏和失效的物理模型
DOI：
10.1016/j.coastaleng.2021.103959
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发表时间：
2021
影响因子：
4.4
通讯作者：
Yu, Caileen
中科院分区：
文献类型：
--
作者：
Duncan, Sean;Cox, Daniel;Barbosa, Andre R.;Lomónaco, Pedro;Park, Hyoungsu;Alam, Mohammad S.;Yu, Caileen
采用物理模型研究了1:6比例尺沿海木结构住宅结构在风暴潮和海浪作用下的受力和响应。测试了一个平地和一个升高的样本，并将其暴露在不同水深和波高的常规波浪中，以模拟飓风登陆低洼屏障岛（如2012年影响美国东海岸的飓风桑迪和2008年影响美国墨西哥湾沿岸的飓风艾克）所导致的典型波浪/浪涌情况。结果表明，通过精心设计，可以构建出与全尺寸结构具有相近强度和刚度的木结构模型试件。采用激光雷达对两个试件进行渐增浪涌和渐增波损伤监测。在较低的水位下，下坡的试样比上坡的试样在预期的情况下发生了破坏。这两个样本所显示的破坏模式与观测到的新泽西州奥特利海滩（Ortley Beach）和德克萨斯州玻利瓦尔半岛（Bolivar Peninsula）住宅结构在飓风桑迪（Sandy）和飓风艾克（Ike）之后的破坏模式一致。在本研究中，还研究了高架结构底部的压力分布以及由此产生的对上阶结构的垂直力。水深、浪高和气隙对压力分布和产生的垂直力有显著影响。结果表明，最大垂直力与浪高、水深呈正相关，与气隙负相关。断裂类型也影响垂直力。不破碎的波浪与相对较小的垂直力相关，而直接在试件上破碎的波浪与峰值垂直力相关。加速度计数据显示，在试验过程中，由于渐进式损伤，试件的刚度下降。建立了高架住宅结构升力随波高和气隙的函数分布方程。与其他数据集相比，该方程通常是保守的。本研究的结果和数据增加了当前对波浪和住宅结构之间相互作用的认识，这可能有助于提高沿海社区的恢复能力。
A physical model study was performed to examine the forces and response of 1:6 scale wood-frame coastal residential structures subjected to storm surge and waves. An on-grade and an elevated specimen were tested and exposed to regular waves with varying water depths and wave heights to simulate typical wave/surge conditions resulting from landfall hurricanes on low-lying barrier islands such as Hurricane Sandy that impacted the US East Coast in 2012 and Hurricane Ike that affected the US Gulf Coast in 2008. Results show that through careful design, wood-frame model specimens can be constructed to have similar strength and stiffness compared to full-scale structures. The two specimens were subjected to increasing surge and wave conditions, and the progressive damage was monitored using LiDAR. The on-grade specimen failed at a lower water level than the elevated specimen as expected. Both specimens showed failure modes consistent with the observed damage of residential structures in Ortley Beach, NJ, after Hurricane Sandy and on the Bolivar Peninsula, TX, after Hurricane Ike. The pressure distribution on the underside of the elevated structure and the resulting vertical forces on the on-grade structure were also examined in this study. The pressure distribution and the resulting vertical forces were significantly affected by water depth, wave height, and air gap. The results indicate that maximum vertical forces are positively correlated to wave height and water depth and negatively correlated to the air gap. The breaking type also affects vertical forces. Nonbreaking waves correlated to relatively small vertical forces, and waves breaking directly on the specimen correlated to peak vertical forces. Accelerometer data showed that the specimen decreased in stiffness during the tests due to progressive damage. An uplift pressure distribution equation was developed for an elevated residential structure as a function of wave height and air gap. The equation is generally conservative when compared to other data sets. The results and data presented in this study increase the current knowledge of the interaction between waves and residential structures, which may be useful to increase the resiliency of coastal communities.
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