Duthinh Dat, Pintar Adam L, Simiu Emil
Research Structural Engineer, Engineering Laboratory, NIST, Gaithersburg, MD 20899.
Mathematical Statistician, Statistical Engineering Division, NIST, Gaithersburg, MD 20899.
J Struct Eng (N Y N Y). 2018;144(11). doi: 10.1061/(asce)st.1943-541x.0002202.
A method is presented for calculating the uncertainty associated with the estimation of peak pressure coefficients from wind tunnel test records of various lengths and how this uncertainty influences design wind effects. The proposed method is applicable to any type of structure and any type of civil engineering aerodynamic testing facility, including large-scale facilities. As an example of the application of the method, an investigation is presented of time series belonging to five categories of pressure coefficients implicit in Chapter 27 of the ASCE 7-10 Standard. The results of the investigation show that, for typical civil engineering wind tunnels, estimated design wind effects based on tests with durations as low as 10 s, corresponding to prototype durations of less than 6 min, are larger than their counterparts based on tests with 100 s duration by only approximately 5%. The proposed method provides useful indications on minimum lengths of pressure records to be measured in wind tunnels.
本文提出了一种方法，用于计算从不同长度的风洞试验记录中估计峰值压力系数时的不确定性，以及这种不确定性如何影响设计风效应。所提出的方法适用于任何类型的结构和任何类型的土木工程空气动力学测试设施，包括大型设施。作为该方法应用的一个例子，本文对ASCE 7 - 10标准第27章中隐含的五类压力系数的时间序列进行了研究。研究结果表明，对于典型的土木工程风洞，基于时长低至10秒（对应原型时长小于6分钟）的试验所估计的设计风效应，仅比基于100秒时长试验的结果大约大5%。所提出的方法为风洞中需测量的压力记录的最小长度提供了有用的指示。
