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 同济大学学报(自然科学版)  2019, Vol. 47 Issue (7): 897-905.  DOI: 10.11908/j.issn.0253-374x.2019.07.001 0

### 引用本文

CHEN Jialu, QUAN Yong, GU Ming. Effects of A Super-high-rise Building on Wind Loads of An Adjacent Building[J]. Journal of Tongji University (Natural Science), 2019, 47(7): 897-905. DOI: 10.11908/j.issn.0253-374x.2019.07.001

### 文章历史

Effects of A Super-high-rise Building on Wind Loads of An Adjacent Building
CHEN Jialu , QUAN Yong , GU Ming
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
Abstract: Based on a series of wind tunnel tests conducted on the rigid model of an actual high-rise building, wind dynamic interference effects on the target building of the proposed super high-rise building and other surrounding buildings were investigated. The results show that upon completion of the proposed building upstream, the shielding effect of it will generally reduce the along-wind mean aerodynamic force of the existing buildings downstream. However, the vortex shedding in its wake may lead to a significant increase in the across-wind peak wind load of the existing buildings downstream, which means that these downstream buildings under the original structural design may no longer be safe.
Key words: wind load    interference effects    super high-rise building    vortex shedding

1 目标建筑及周边建筑概况

 图 1 测点层位置示意 Fig.1 Positions of measurement points

 图 2 周边建筑及风向角信息(单位：m) Fig.2 Surrounding buildings and wind directions(unit:m)

2 试验概况

 图 3 风场模拟结果 Fig.3 Parameters of the simulated wind field

 图 4 各工况平面示意 Fig.4 Layout of surrounding buildings under each test case
3 数据处理

4 实验结果

4.1 拟建大高楼的影响

 图 5 工况2和工况3的CF统计值对比 Fig.5 The comparison of CF between Case 2 & Case 3

 图 6 工况2和工况3的CFx_rms和CFy_rms值随风向角变化 Fig.6 CF_rms of Case 2 & Case 3 versus wind angles

350°风向角附近，目标建筑脉动气动力的增大与上游拟建大高楼的尾流旋涡脱落有关.在350°风向角附近，大高楼正好处于目标建筑上游，来流经过大高楼后会发生旋涡脱落现象，尾流中相互交替的旋涡会极大地激励下游建筑的横风向气动力，使其横风向气动力脉动值显著增大.顺风向气动力的脉动值也会受到上游大高楼的干扰，但不会有横风向显著，这与图 6中的分析结果一致.

 图 7 工况2和工况3在350°风向工况下的S*CF Fig.7 S*CF of Case 2 & Case 3 at a wind angle of 350°

 图 8 工况4和工况5的CFx统计值对比 Fig.8 The comparison of CFx between Case 4 & Case 5
 图 9 工况4和工况5的CFy统计值对比 Fig.9 The comparison of CFy between Case 4 & Case 5

 图 10 工况4和工况5在170°风向角下的SCFx* Fig.10 SCFx* of Case 4 & Case 5 at a wind angle of 170°
 图 11 工况2和工况3在180°风向角下的SCFx* Fig.11 SCFx* of Case 2 & Case 3 at a wind angle of 180°

4.2 等高姊妹楼的影响

 图 12 工况1和工况2的CFx统计值对比 Fig.12 The comparison of CFx between Case 1 & Case 2
 图 13 工况1和工况2的CFy统计值对比 Fig.13 The comparison of CFy between Case 1 & Case 2

 图 14 工况1和工况2的CFx_rms和CFy_rms值随风向角变化图 Fig.14 CF_rms of Case 1 & Case 2 versus wind angles

 图 15 70和180°风向角下工况1和工况2的SCFx* Fig.15 SCFx* of Case 1 & Case 2 for 70°& 180°

4.3 背景建筑群的影响

 图 16 工况2和工况4的CFx统计值对比 Fig.16 The comparison of CFx between Case 2 & Case 4
 图 17 工况2和工况4的CFy统计值对比 Fig.17 The comparison of CFy between Case 2 & Case 4

 图 18 工况2，工况3和工况5各工况的CFx统计值对比 Fig.18 The comparison of CFx among Case 2, Case 3 & Case 5
 图 19 工况2，工况3和工况5各工况的CFy统计值对比 Fig.19 The comparison of CFy among Case 2, Case 3 & Case 5

 图 20 工况2，工况3和工况5各工况CFx_rms随风向角变化 Fig.20 CFx_rms of Case 2, Case 3 & Case 5 versus wind angles
 图 21 工况2，工况3和工况5各工况CFy_rms随风向角变化 Fig.21 CFy_rms of Case 2, Case 3 & Case 5 versus wind angle

 图 22 350°风向角下工况2，工况3和工况5各工况的SCFx* Fig.22 SCFx* of Case 2, Case 3 & Case 5 at a wind angle of 350°
 图 23 350°风向角下工况2，工况3和工况5的SCFy* Fig.23 SCFy* of Case 2, Case 3 & Case 5 at a wind angle of 350°

5 结论

(1) 拟建“高大”建筑的遮挡效应会减小下游既有较低矮建筑的顺风向气动力平均值.但与此同时，由于尾流旋涡脱落的影响，“高大”建筑的出现也可能会显著放大下游“低矮”建筑的顺风向和横风向气动力脉动，最终导致其横风向风荷载峰值显著增大，这可能使得原结构设计变得不安全.

(2) 拟建“高大”建筑也会在一定程度上削弱其上游邻近较低矮建筑的横风向气动力脉动，背景建筑较密集时这种影响有可能更为显著.

(3) 紧邻的等高姊妹楼的遮挡效应可能会使下游目标建筑的顺风向气动力平均值和脉动值以及横风向气动力脉动值都有所下降；当姊妹楼相对于来流处在目标建筑一侧时，它与目标建筑间的气流可能会产生狭管效应，导致目标建筑横风向气动力脉动值的增大.

(4) 背景建筑群主要起遮挡来流的作用.在上游背景建筑比较密集时，下游建筑的顺风向气动力系数均值会显著降低.当上游出现一些与目标建筑等高度的背景建筑群时，目标建筑的顺风向和横风向气动力脉动值可能会被放大，导致风荷载峰值的增大.当拟建大型超高层建筑处在目标建筑上游时，背景建筑群的存在会略微削弱大型超高层对目标建筑的干扰效应.

(5) 在实际工程中建设一座比周边建筑更高大的超高层建筑时，它可能会对周围的邻近建筑有不利影响.设计者在关注周边建筑对其风荷载的影响时，也应该就拟建高大建筑的出现对邻近建筑风荷载的影响给予足够的重视.

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