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(廣州大學(xué)土木工程學(xué)院, 廣州 510006)

摘要: 基于某地鐵上蓋 120m 高超高層結(jié)構(gòu)的工程背景,分別對(duì)無樁基礎(chǔ)結(jié)構(gòu)、15m 樁周降阻樁基礎(chǔ)結(jié)構(gòu)以及30m 無側(cè)摩阻力樁基礎(chǔ)結(jié)構(gòu),進(jìn)行了 1 ∶30 縮尺振動(dòng)臺(tái)試驗(yàn). 基于白噪聲和 7 條地鐵振動(dòng)波不同峰值加速度激勵(lì)下的結(jié)構(gòu)響應(yīng),對(duì)比分析了三個(gè)振動(dòng)臺(tái)試驗(yàn)?zāi)Ｐ透鳒y(cè)點(diǎn)樓層的振動(dòng)響應(yīng). 結(jié)果表明:樁基長(zhǎng)度的改變可明顯改變上蓋結(jié)構(gòu)的動(dòng)力特性,上蓋結(jié)構(gòu) X、Y、Z 三向頻率呈現(xiàn)隨樁基長(zhǎng)度增加而減小的變化趨勢(shì),且樁基越長(zhǎng)上蓋結(jié)構(gòu)的頻率越低. 相比于無樁基礎(chǔ)結(jié)構(gòu),15m 樁周降阻基礎(chǔ)結(jié)構(gòu)在避免地鐵隧道下沉風(fēng)險(xiǎn)的同時(shí),有利于降低上蓋結(jié)構(gòu)的振動(dòng)響應(yīng). 同時(shí)樁周降阻處理的樁基礎(chǔ)改變了上蓋結(jié)構(gòu)的動(dòng)力特性,使上蓋結(jié)構(gòu)樓層振動(dòng)由高頻向低頻轉(zhuǎn)移;而30m 無側(cè)摩阻力樁基礎(chǔ),對(duì)降低上蓋結(jié)構(gòu)的振動(dòng)響應(yīng)有限,且不影響結(jié)構(gòu)樓層的振動(dòng)頻率分布. 實(shí)際工程設(shè)計(jì)時(shí),應(yīng)綜合豎向振動(dòng)響應(yīng)控制、地鐵隧道沉降和樁基穩(wěn)定性,合理設(shè)計(jì)樁周降阻長(zhǎng)度.

關(guān)鍵詞: 地鐵上蓋建筑; 地鐵振動(dòng)波激勵(lì); 超高層結(jié)構(gòu); 樁基長(zhǎng)度; 樁周降阻; 振動(dòng)臺(tái)試驗(yàn); 振動(dòng)響應(yīng)

中圖分類號(hào):TU375,TU317+. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)05-0029-07

DOI: 10. 19701 / j. jzjg. ZJ210017

Study on vertical shaking table model test of super high-rise structure over subway:non vibration control model considering pile length

DING Chao, WANG Dayang, ZHOU Yun, LIANG Qiuhe, LI Junrui, LING Haimei, KE Xiaobo

(College of Civil Engineering, Guangzhou University, Guangzhou 510006, China)

Abstract: Based on the actual engineering background of a 120m height super high-rise structure above subway,the 1 ∶30scale shaking table tests were carried out for structure without pile foundation, structure with 15m resistance-reducing pilefoundation and structure with 30m non-lateral friction resistance pile foundation respectively. According to the structuralresponses of white noise and 7 subway vibration waves excited by different peak accelerations, the vibration responses offloors at each measuring point of three vibration table structures were compared and analyzed. The results show that thechange of pile foundation length can significantly change the dynamic characteristics of the upper cover structure. Thethree-directional frequency of X, Y, and Z of the upper cover structure decreases with the increase of the pile foundationlength, and the longer the pile foundation, the lower the frequency of the upper cover structure. Compared with structurewithout pile foundation, structure with 15m resistance-reducing pile foundation is beneficial to reduce the vibration responseof the upper cover structure while avoiding the risk of subway tunnel sinking. At the same time, the pile foundation treatedwith resistance reduction around the pile changes the dynamic characteristics of the upper cover structure, which makes thefloor vibration of the upper cover structure transfer from high frequency to low frequency. The 30m non-lateral frictionresistance pile foundation has a limited response to reduce the vibration of the upper cover structure and does not affect thevibration frequency distribution of the structural floor. In actual engineering design, the control of vertical vibration effect,settlement of subway tunnel, and stability of pile foundation should be integrated to reasonably design theresistance-reducing length around the pile.

Keywords:building over subway; subway vibration wave excitation; super high-rise structure; pile foundation length;reduced resistance around the pile; shaking table test; vibration response

∗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:丁超,碩士研究生,主要從事結(jié)構(gòu)減振控制研究,Email: 13893276245@ 163. com.

[引用本文] 丁超,汪大洋,周云,等. 地鐵上蓋超高層結(jié)構(gòu)豎向振動(dòng)臺(tái)模型試驗(yàn)———考慮樁長(zhǎng)的非振動(dòng)控制模型研究[ J] . 建筑結(jié)構(gòu),2022,52(5) :29-35. DING Chao,WANG Dayang,ZHOU Yun,et al. Study on vertical shaking tablemodel test of super high-rise structure over subway: non vibration control model considering pile length [ J ] . BuildingStructure,2022,52(5) :29-35.