發(fā)布時間：2019-02-15 11:40

【摘要】：以位于南京秀山頂部某電視塔為例,為精確考慮三維地形效應(yīng)對電視塔風(fēng)荷載設(shè)計(jì)取值的影響,首先對電視塔周邊800 m內(nèi)的山頂?shù)匦芜M(jìn)行風(fēng)洞試驗(yàn),獲取電視塔結(jié)構(gòu)參考高度處的風(fēng)速修正系數(shù);然后利用高頻動態(tài)天平測力(HFFB)技術(shù)進(jìn)行不同風(fēng)向角下電視塔剛體模型測力試驗(yàn)。基于試驗(yàn)結(jié)果,提煉出不同風(fēng)向角下電視塔結(jié)構(gòu)基底等效內(nèi)力和頂部峰值加速度響應(yīng)的分布規(guī)律,并分析典型最不利風(fēng)向角下電視塔結(jié)構(gòu)層等效靜力風(fēng)荷載(ESWLs)分布特性。研究結(jié)果表明:山頂?shù)匦稳S效應(yīng)對于此類電視塔結(jié)構(gòu)風(fēng)力分布的影響顯著。本文試驗(yàn)和相關(guān)結(jié)論可為此類山頂?shù)匦坞娨曀Y(jié)構(gòu)抗風(fēng)設(shè)計(jì)提供參考。
[Abstract]:Taking a TV tower at the top of Xiushan Mountain in Nanjing as an example, in order to accurately consider the influence of 3D topographic effect on the design value of wind load of TV tower, a wind tunnel test is carried out on the hilltop topography within 800 m around the tower. The wind speed correction coefficient at the reference height of the TV tower structure is obtained. Then the high frequency dynamic balance (HFFB) technique is used to test the rigid body model of TV tower at different wind angles. Based on the experimental results, the distribution law of the equivalent internal force on the base and the peak acceleration response at the top of the TV tower structure under different wind direction angles are extracted, and the (ESWLs) distribution characteristics of the equivalent static wind load on the television tower structure layer under the typical most unfavorable wind direction angle are analyzed. The results show that the 3D effect of hilltop topography has a significant effect on the wind distribution of this kind of TV tower structure. The experimental results and relevant conclusions can be used as reference for the wind resistant design of this kind of mountaintop topographic TV tower structure.
【作者單位】： 南京航空航天大學(xué)航空宇航學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(U1733129) 江蘇省優(yōu)秀青年基金資助項(xiàng)目(BK20160083)~~
【分類號】：TU312.1
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本文編號：2423308