基于美标的高风速作用下超高烟囱设计与试验研究

Designation and experimental investigation of tall chimneys in high wind speed based on American code

超高烟囱具有柔度大、刚度和阻尼小等特点,是典型的风敏感结构,其抗风设计是结构设计的重要内容。以国外某270 m高的超高烟囱在高风速(80 m/s)作用下设计为例,分别采用中美标准计算和风洞试验对其设计风荷载取值进行对比研究,包括刚性模型测压及测力试验、风振响应分析、气弹模型测振风洞试验。通过对试验结果与中、美标准验算结果对比分析,对超高烟囱在高风速作用下的设计风荷载取值提出合理建议。

The tall chimney is a typical wind-sensitive structure due to its characteristics of large softness,low stiffness and small damping,and wind-resistant design is an important part of structural design.Taking the design of a foreign 270 m high chimney under the action of high wind speed(80 m/s)as an example,the value of the designed wind load is studied by calculating Chinese and American standard and wind tunnel test respectively,including pressure and force measurement wind tunnel tests of rigid models,wind-induced response analyses,and vibration measurement tests on aeroelastic models.Based on the comparison and analysis between the test results and the American and Chinese standard calculation results,reasonable wind load values are put forward for the tall chimney under the action of high wind speed.