考虑摩擦作用的柔性光伏支架风振响应分析

Research on wind induced vibration response of flexible photovoltaic support structure considering friction effect

在风荷载作用下,柔性光伏支架易产生较大的变形和振动,应特点关注风振响应。因此,在SAP2000中,对三跨大跨度柔性光伏支架进行有限元建模,采用Davenport风速功率谱生成的风荷载时程作为荷载输入,分析柔性光伏支架在风荷载时程作用下的结构响应,并与静力风荷载作用下的结构响应进行对比。同时,考虑索与中部支架之间的摩擦作用,考察不同摩擦系数下结构的风振响应,探究摩擦力对柔性光伏支架风振响应的影响。结果表明,与静力分析相比,柔性光伏支架动力时程分析位移放大系数和索力放大系数分别为1.64和1.63;索与中部支架之间的摩擦作用能够增强结构整体耗能能力,有助于减小柔性光伏支架的风振响应;不同工况下的等效风振系数取值相差较大。因此在对柔性光伏支架进行静力分析时,应综合考虑实际情况,对风振系数进行合理取值。

The flexible photovoltaic support structure may lead to significant displacement and vibration due to the wind load,so the wind-induced vibration response should be focused.The finite element model of three large span flexible photovoltaic support structure was modeled in SAP2000,and the wind load time history generated by the Davenport wind speed power spectrum was adopted as input load.The responses of the flexible photovoltaic support structure was obtained and compared with the responses under static wind load.Then,the friction between the cable and the middle bracket was considered,and the wind-induced vibration responses under different friction coefficients and the influence of friction on the wind-induced vibration responses of flexible photovoltaic brackets were investigated.The results indicated that the displacement and cable force amplification coefficient are 1.64 and 1.63,respectively,in dynamic time history analysis.The friction between the cable and the middle bracket can increase the energy dissipation capacity of the structure,which help to reduce the wind-induced vibration responses of the flexible photovoltaic bracket.The equivalent wind load amplification coefficient values varied greatly under different working conditions,so it is necessary to comprehensively consider the actual situation and choose a reasonable value for the wind load amplification coefficient when conducting static analysis of flexible photovoltaic support structure.