振动与冲击
振動與遲擊
진동여충격
Journal of Vibration and Shock
2015年
19期
131-137
,共7页
独立柱广告牌%风洞试验%风荷载特性%风致响应
獨立柱廣告牌%風洞試驗%風荷載特性%風緻響應
독립주엄고패%풍동시험%풍하재특성%풍치향응
single column-supported billboard%wind tunnel test%wind load characteristic%wind-induced response
基于刚性模型测压风洞试验数据，分析了双面式及三面式独立柱广告牌的风荷载特性，并采用时程分析法对其风振特性进行了研究。结果显示：双面式广告牌的合风力系数平均值和脉动值在0°～15°风向角下分别达到最大值1．46和0．17，而三面式广告牌则在0°风向角下达到最大值1．45和0．16；两者的扭矩系数平均值分别在52．5°、30°风向角达到最大值；双面式广告牌的节点位移响应共振能量由垂直于面板方向的弯曲振型提供，而三面式广告牌的节点位移响应共振能量由平行于面板组成三角形的中线和垂直于中线的弯曲振型提供；两者的钢管梁扭转角响应的共振能量都由扭转振型提供；双面式、三面式广告牌弯曲振动最不利工况为0°风向角，风振系数分别为1．51、1．59；扭转振动最不利工况分别为52．5°风向角、30°风向角，风振系数分别为1．63、2．65。
基于剛性模型測壓風洞試驗數據，分析瞭雙麵式及三麵式獨立柱廣告牌的風荷載特性，併採用時程分析法對其風振特性進行瞭研究。結果顯示：雙麵式廣告牌的閤風力繫數平均值和脈動值在0°～15°風嚮角下分彆達到最大值1．46和0．17，而三麵式廣告牌則在0°風嚮角下達到最大值1．45和0．16；兩者的扭矩繫數平均值分彆在52．5°、30°風嚮角達到最大值；雙麵式廣告牌的節點位移響應共振能量由垂直于麵闆方嚮的彎麯振型提供，而三麵式廣告牌的節點位移響應共振能量由平行于麵闆組成三角形的中線和垂直于中線的彎麯振型提供；兩者的鋼管樑扭轉角響應的共振能量都由扭轉振型提供；雙麵式、三麵式廣告牌彎麯振動最不利工況為0°風嚮角，風振繫數分彆為1．51、1．59；扭轉振動最不利工況分彆為52．5°風嚮角、30°風嚮角，風振繫數分彆為1．63、2．65。
기우강성모형측압풍동시험수거，분석료쌍면식급삼면식독립주엄고패적풍하재특성，병채용시정분석법대기풍진특성진행료연구。결과현시：쌍면식엄고패적합풍력계수평균치화맥동치재0°～15°풍향각하분별체도최대치1．46화0．17，이삼면식엄고패칙재0°풍향각하체도최대치1．45화0．16；량자적뉴구계수평균치분별재52．5°、30°풍향각체도최대치；쌍면식엄고패적절점위이향응공진능량유수직우면판방향적만곡진형제공，이삼면식엄고패적절점위이향응공진능량유평행우면판조성삼각형적중선화수직우중선적만곡진형제공；량자적강관량뉴전각향응적공진능량도유뉴전진형제공；쌍면식、삼면식엄고패만곡진동최불리공황위0°풍향각，풍진계수분별위1．51、1．59；뉴전진동최불리공황분별위52．5°풍향각、30°풍향각，풍진계수분별위1．63、2．65。
Based on rigid model wind tunnel tests,the wind load characteristics of double-side and three-side single column-supported billboards were analyzed,and their wind-induced vibration characteristics were studied using the time history analysis method.The results showed that the mean and fluctuating total wind loading coefficients for a double-side billboard have the maximum values of 1.46 and 0.17 under 0°~15°wind direction angle,while those of a three-side billboard have the maximum values of 1.45 and 0.16 under 0°wind direction angle;their mean torgue coefficient reaches the maximum value under 52.5°and 30°wind direction angles,respectively;the resonance energy of node displacement for a double-side billboard is provided by the bending mode perpendicular to the panels,while that for a three-side billboard is provided by the bending modes perpendicular to and parallel to the center line of the triangle composed with panels;the resonance energy of beam torsion angle for two billboards is provided by torsional modes;the most unfavorable condition for bending vibration of two billboards is 0°wind direction angle,and the wind vibration coefficients are 1.51 and 1.59,respectively;while the most unfavorable conditions for torsional vibration of two billboards are 52.5°and 30°wind direction angles the wind vibration coefficient are 1.63 and 2.65,respectively.
