Wind tunnel test on responses of a lightweight roof structure under joint action of wind and snow loads
Wind tunnel test on responses of a lightweight roof structure under joint action of wind and snow loads
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DOI：
10.1016/j.coldregions.2016.09.011
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发表时间：
2016-12
影响因子：
4.1
通讯作者：
Xuanyi Zhou;Shengguan Qiang;Yasong Peng;M. Gu
中科院分区：
文献类型：
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作者：
Xuanyi Zhou;Shengguan Qiang;Yasong Peng;M. Gu
预测结构在风雪联合作用下的响应，对于保证雪域轻质屋盖结构的安全具有重要意义。本文从风场相似、质点运动相似、建筑物周围流动相似、结构动力学相似等角度，提出了模拟风雪联合作用下结构响应的风洞试验应满足的一系列相似参数。然后，以双坡屋盖结构为研究对象，设计了含替代雪粒的气动弹性模型试验，并通过风洞试验获得了结构响应。还进行了另外两种试验，即附加重量的气弹模型试验和测压试验，并将其结果与替代雪粒的气弹模型试验结果进行了比较。另外两种试验的均值和均方根响应均显著低于含替代雪粒的气动弹性模型试验。初步结论是，风致结构振动受风雪漂移的影响，颗粒层和屋盖结构可能发生非同步振动，从而导致结构动力响应显著增加。
Predicting structural responses under joint action of wind and snow loads is important in ensuring the safety of lightweight roof structures in snowy regions. In this paper, a series of similarity parameters that should be satisfied in the wind tunnel test to simulate structural responses under joint action of wind and snow loads are proposed from the perspective of similarity of wind field, particle movement, flow around the building, and structural dynamics. Then, with a double-pitched roof structure as research object, an aeroelastic model test with substituted snow particles is designed and structural responses are obtained through the wind tunnel test. The other two types of tests, namely, aeroelastic model test with additional weights and pressure measurement test, are also conducted; their results are compared with those of the aeroelastic model test with substituted snow particles. The mean and RMS response of the other two types of tests are both significantly lower than those of the aeroelastic model test with substituted snow particles. The preliminary conclusion is that wind-induced structural vibration is influenced by snowdrift and possible asynchronous vibration of the particle layer and roof structure, which could lead to a considerable increase in structural dynamic responses.