【摘要】 计算全封闭声屏障自然风荷载时,对结构整体受力计算需要确定体型系数,对声屏障板等围护结构设计需要确定局部体型系数或局部风压。对体型系数,现行规范没有可参照的体型;对局部体型系数,现行规范中的取值依据为直立声屏障,故需要采用风洞实验确定全封闭声屏障的自然风荷载各项取值。文章以某城际轨道交通工程为背景,在顶部设置1m宽通风排烟口的前提下,进行缩尺风洞实验。结果表明:声屏障迎风面净体型系数超过1.4,背风面体型系数接近0.3;考虑风压脉动的风荷载为-1.571～2.065k Pa;迎风面各测点的阵风系数基本为1.3～1.5。更多还原

【Abstract】 When calculating the natural wind load of the fully-enclosed noise barrier, it is necessary to determine the body shape coefficient for the stress calculation of integral structure and the local body shape coefficient or the local wind pressure for the building envelope design such as noise barrier. However, as for the body shape coefficient, there is no body shape available for reference in the current codes; as for the local body shape coefficient, the value specified in the current codes is based on the vertical noise barrier, so the values of the fully enclosed noise barrier under natural wind load need to be determined by wind tunnel experiment. With an inter-city rail transit project as the background, the reduced-scale wind tunnel experiment was carried out on the premise of setting a one-meter-wide smoke vent on the top. The results show that the net body shape coefficient on the windward side of noise barrier is more than 1.4, and the body shape coefficient on the leeward side is close to 0.3. The wind load under a fluctuating wind pressure is-1.571～2.065 kPa; the gustiness factor of each measuring point on the windward surface is 1.3～1.5.更多还原