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目前桥梁的抗风研究主要针对平原开阔地区,复杂山地风作用下桥梁的抗风问题研究很少。以重庆大宁河钢桁架特大拱桥为对象,通过现场实测,得到了该桥桥址处的风环境特性,包括平均风速沿高度的变化规律、湍流强度、脉动风功率谱密度函数以及湍流积分尺度等参数。根据风特性参数,计算出该桥在成桥状态下的抖振力和响应值,结果表明:即使在45m/s风速下,抖振位移响应也在公路桥梁抗风设计规范(JTG/T D60-01-2004)规定范围内。山区地貌中的平均风速沿高度的变化规律不符合公路桥梁抗风设计规范给出的指数变化率分布,湍流强度明显大于规范值。
At present, the research on wind resistance of bridges is mainly aimed at the open areas of the plain. There are few studies on the wind resistance of the bridges under the influence of complex mountain winds. Taking the steel truss arch bridge of Daning River in Chongqing as an example, the wind environment characteristics at the bridge site were obtained by on-site measurements, including the variation of average wind speed along the height, the turbulence intensity, the power spectral density function of pulsating wind and the turbulent integral scale Other parameters. According to the wind parameters, the buffeting force and response value of the bridge under the condition of the bridge are calculated. The results show that the response of the chattering displacement is also reflected in the wind resistance design of highway bridges (JTG / T D60 -01-2004) within the prescribed range. The variation of mean wind speed along the height in mountainous landform does not accord with the index change rate distribution given by the wind-resistant design code of highway bridges, and the turbulence intensity is obviously larger than the standard value.