- 摘 要
-
(廣州大學(xué)土木工程學(xué)院, 廣州 510006)
摘要: 以某地鐵上蓋 120m 高超高層結(jié)構(gòu)為研究對象,針對不考慮樁基礎(chǔ)、考慮 15m 樁周降阻樁基礎(chǔ)以及 30m 無側(cè)摩阻力樁基礎(chǔ)的情況,按 1 ∶30 縮尺比分別設(shè)計(jì)無樁基礎(chǔ)、0. 5m 以及 1m 樁基礎(chǔ)的三種振動控制結(jié)構(gòu)模型( 分別為 TD、TE、TF 模型) ,并對其進(jìn)行了 7 條地鐵振動波 21 種工況下的振動臺試驗(yàn),探討樁長效應(yīng)對上蓋結(jié)構(gòu)振動控制層的振動控制效果及對上部樓層的豎向動力響應(yīng)的影響. 結(jié)果表明,考慮樁基礎(chǔ)后,結(jié)構(gòu)周期延長,豎向頻率降低. 不同樁長模型振動控制層以及上部樓層的主頻分布一致,且上蓋結(jié)構(gòu)動力響應(yīng)均沿高度先減小后增大. TE模型振動控制層的振動控制效果最佳,且 TE 模型與 TD 模型上部樓層的豎向動力響應(yīng)接近,而 TF 模型上部樓層的豎向動力響應(yīng)則呈現(xiàn)放大趨勢. 建議采用類似振動控制設(shè)計(jì)時(shí),應(yīng)合理設(shè)計(jì)樁基降阻的高度范圍,使之具有較好的振動控制效果,且對上部樓層響應(yīng)不產(chǎn)生負(fù)面影響,同時(shí)又可降低樁基設(shè)計(jì)對隧道及地鐵運(yùn)行的影響.
關(guān)鍵詞: 地鐵上蓋建筑; 超高層結(jié)構(gòu); 振動臺試驗(yàn); 樁長效應(yīng); 豎向振動響應(yīng); 豎向振動控制效果
中圖分類號:TU375,TU317+. 1 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2022)05-0036-07
DOI:10. 19701 / j. jzjg. ZJ210013
Study on vertical shaking table model test of super high-rise structure over subway:vibration control model considering pile length
LING Haimei, WANG Dayang, ZHOU Yun, LIANG Qiuhe, LI Junrui, DING Chao, KE Xiaobo
(College of Civil Engineering, Guangzhou University, Guangzhou 510006, China)
Abstract: Taking a 120m height super high-rise structure over subway as the research object, in view of the situation of notconsidering the pile foundation, considering the 15m resistance-reducing pile foundation and the 30m non-lateral frictionresistance pile foundation, three vibration control structural models of pileless foundation, 0. 5m and 1m pile foundation(TD, TE, TF model, respectively) were designed according to the 1 ∶30 shrinkage ratio. Shaking table tests were carriedout under 21 working conditions of 7 subway vibration waves, and the influence of pile length effect on the vibration controleffect of the vibration control layer of the upper cover structure and the vertical dynamic response of the upper floor werediscussed. The results show that after considering the pile foundation, the structure cycle is extended and the verticalfrequency is reduced. The main frequency distribution of the vibration control layer and the upper floor of different pilelength models is consistent, and the dynamic response of the upper cover structure decreases first and then increases alongthe height. The vibration control effect of the vibration control layer of the TE model is the best, and the vertical dynamicresponse of the upper floor of the TE model is close to that of the upper floor of the TD model, while the vertical dynamicresponse of the upper floor of the TF model shows an amplification trend. It is recommended that when using a similarvibration control design, the height range of the resistance reduction of the pile foundation should be reasonably designed,so that it has a good vibration control effect, and does not have a negative impact on the response of the upper floor, and atthe same time can reduce the impact of the pile foundation design on the operation of the tunnel and subway.
Keywords:building over subway; super high-rise structure; shaking table test; pile length effect; vertical vibrationresponse; vertical vibration control effect
∗廣州市科技計(jì)劃項(xiàng)目(202032866、202102010459) ,廣東省科技創(chuàng)新戰(zhàn)略專項(xiàng)資金( pdjh2020a0452) .
第一作者:凌海媚,碩士研究生,主要從事結(jié)構(gòu)減振控制研究,Email: 2111916024@ e. gzhu. edu. cn.
[引用本文] 凌海媚,汪大洋,周云,等. 地鐵上蓋超高層結(jié)構(gòu)豎向振動臺模型試驗(yàn)———考慮樁長的振動控制模型研究[ J] . 建筑結(jié)構(gòu),2022,52 ( 5) :36-42. LING Haimei,WANG Dayang,ZHOU Yun,et al. Study on vertical shakingtable model test of super high-rise structure over subway: vibration control model considering pile length [ J] . BuildingStructure,2022,52(5) :36-42.
- 下載地址
-
