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(1 國(guó)網(wǎng)河北省電力有限公司經(jīng)濟(jì)技術(shù)研究院, 石家莊 050000;2 河北大學(xué)建筑工程學(xué)院, 保定 071002)

摘要: 從變電站樁基-筏板-配電樓結(jié)構(gòu)耦合體系出發(fā),采用 PLAXIS 3D 建立樁筏基礎(chǔ)-地基-上部結(jié)構(gòu)三維有限元整體模型,其中,土體非線(xiàn)性力學(xué)行為采用考慮小應(yīng)變特性的雙曲線(xiàn)型彈塑性(HSS)模型模擬,動(dòng)力計(jì)算中采用自由場(chǎng)邊界(模型四周)和柔性底部邊界(模型底部)來(lái)模擬無(wú)限地基。 通過(guò)整體模型動(dòng)力時(shí)程分析,研究了 3 條典型地震波及其不同加速度峰值情況下長(zhǎng)樁和短樁設(shè)計(jì)方案對(duì)應(yīng)的上部結(jié)構(gòu)及樁筏基礎(chǔ)動(dòng)力響應(yīng)特性。 結(jié)果表明:變電站配電樓雖然層數(shù)較低,在地震作用下樓頂仍然表現(xiàn)出一定的放大效應(yīng);考慮結(jié)構(gòu)后的地表水平加速度峰值總體上高于自由場(chǎng)地的情況,距結(jié)構(gòu) 30m 范圍內(nèi)地表水平加速度反應(yīng)相對(duì)較大;樁長(zhǎng)在一定范圍內(nèi)變化對(duì)上部結(jié)構(gòu)的振動(dòng)響應(yīng)影響不大;上部結(jié)構(gòu)的水平加速度峰值隨輸入地震動(dòng)加速度峰值增加而增大,地下室底板中部彎矩極值對(duì)地震動(dòng)加速度峰值及不同地震波波形均不敏感。

關(guān)鍵詞: 變電站; 配電樓; 地震反應(yīng); 樁筏基礎(chǔ)-地基-上部結(jié)構(gòu); 地震強(qiáng)度; HSS 模型

中圖分類(lèi)號(hào):TU473 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)23-0139-08

DOI:10. 19701 / j. jzjg. LS210193

Seismic response analysison substation distribution building considering influence of different pile length

LI Mingfu1, WANG Yamin1, WANG Shuo1, ZHANG Haiqing2

(1 Economic and Technological Research Institute, State Grid Hebei Electric Power Co. , Ltd. , Shijiazhuang 050000,China; 2 College of Civil Engineering and Architecture, Hebei University, Baoding 071002, China)

Abstract: Starting from the coupling system of pile foundation-raft-distribution building structure of a substation, thethree-dimensional finite element model of pile raft foundation-ground-superstructure was established by using PLAXIS 3D.The nonlinear mechanical behavior of soil was simulated by hyperbolic elastic-plastic (HSS) model considering small straincharacteristics. The free field boundary (around the model) and compliant base boundary (bottom of the model) were usedto simulate the infinite ground. Through the dynamic time history analysis of the overall model, the dynamic responsecharacteristics of the super structure supported by long or short piles under three typical seismic waves with different peakaccelerations were studied. The results show that although the number of floors of substation distribution building is low, theroof still shows a certain amplification effect under the action of earthquake. The peak value of surface horizontalacceleration after considering the structure is generally higher than that of free site, and the horizontal acceleration responseof surface within 30m from the structure is relatively large. The change of pile length in a certain range has little effect onthe vibration response of superstructure. The peak value of the horizontal acceleration of the superstructure increases withthe increase of the peak ground acceleration, and the extreme value of bending moment in the middle of the basement flooris not sensitive to the peak ground acceleration and different waveforms.

Keywords:substation; distribution building; seismic response; pile raft foundation-ground-superstructure; earthquakeintensity; HSS model

∗國(guó)網(wǎng)河北省電力有限公司科技項(xiàng)目資助“基于數(shù)值模擬的變電站軟弱地基分析技術(shù)研究”(B704JY200081)。

第一作者:李明富,學(xué)士,高級(jí)工程師,主要從事變電站土建設(shè)計(jì),Email:147801540@ qq. com。

[引用本文] 李明富,王亞敏,王朔,等. 考慮不同樁長(zhǎng)影響的變電站配電樓地震反應(yīng)分析[ J]. 建筑結(jié)構(gòu),2022,52(23):139-146. LI Mingfu,WANG Yamin,WANG Shuo,et al. Seismic response analysison substation distribution buildingconsidering influence of different pile length[J]. Building Structure,2022,52(23):139-146.