本文選題：地震激勵(lì) + 高樁碼頭　； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：高樁碼頭是我國港口建設(shè)中常用的碼頭結(jié)構(gòu)型式，在港口建設(shè)和發(fā)展中有著重要作用。歷次震害表明，高樁碼頭結(jié)構(gòu)極易遭受地震破壞，因此在其設(shè)計(jì)使用年限內(nèi)是否擁有足夠的抗震能力非常重要。本文考慮樁-土相互作用，以隨機(jī)過程作為地震動(dòng)輸入，對(duì)高樁碼頭隨機(jī)地震響應(yīng)特征進(jìn)行分析，主要研究內(nèi)容及成果如下： （1）對(duì)常用地震動(dòng)輸入和樁-土接觸模擬方法進(jìn)行了總結(jié)，并參考建筑抗震設(shè)計(jì)規(guī)范（GB50011-2010）和前人的研究成果獲得相關(guān)參數(shù)，以大型通用有限元軟件ABAQUS為平臺(tái)，建立了高樁碼頭的二維有限元模型。 （2）對(duì)該有限元模型進(jìn)行結(jié)構(gòu)自振分析，計(jì)算了高樁碼頭結(jié)構(gòu)的模態(tài)振型，確定了結(jié)構(gòu)的振動(dòng)特性及所需模態(tài)階次。 （3）考慮樁-土相互作用，對(duì)高樁碼頭結(jié)構(gòu)進(jìn)行了反應(yīng)譜分析，獲得了三種不同方向地震激勵(lì)作用下結(jié)構(gòu)的位移及應(yīng)力曲線。并對(duì)所得的曲線進(jìn)行分析發(fā)現(xiàn)：在水平地震激勵(lì)作用下碼頭結(jié)構(gòu)向前傾覆，豎向地震激勵(lì)作用下碼頭結(jié)構(gòu)整體向前水平移動(dòng)，水平激勵(lì)對(duì)土體和結(jié)構(gòu)的變形起主導(dǎo)作用。 （4）對(duì)高樁碼頭有限元模型進(jìn)行隨機(jī)地震響應(yīng)分析，，得出了在隨機(jī)地震激勵(lì)下結(jié)構(gòu)響應(yīng)位移及拉應(yīng)力的功率譜曲線。隨后，對(duì)拉應(yīng)力響應(yīng)的功率譜曲線進(jìn)行分析，得到了其在概率保證為75%的置信區(qū)間內(nèi)的拉應(yīng)力均方根值。依此可以確定，碼頭節(jié)點(diǎn)的相對(duì)位移功率譜曲線的峰值均出現(xiàn)在較小頻率處，且高階振型對(duì)結(jié)構(gòu)響應(yīng)的影響有限。 （5）將反應(yīng)譜分析與隨機(jī)地震響應(yīng)分析結(jié)果進(jìn)行比較，可看出，兩者所得位移及應(yīng)力曲線變化趨勢較為一致，且數(shù)量級(jí)相同。只是兩者在數(shù)值上有所差異，其中，反應(yīng)譜分析所得到的應(yīng)力最大值較大。據(jù)此可確定，反應(yīng)譜分析相對(duì)較為保守，而對(duì)工程實(shí)例進(jìn)行功率譜分析是十分必要的。 （6）在地震作用下，對(duì)結(jié)構(gòu)地震響應(yīng)的影響因素（如上部結(jié)構(gòu)型式、后方填土等）進(jìn)行分析，可發(fā)現(xiàn)：上部為框架結(jié)構(gòu)時(shí)，樁頂處拉應(yīng)力值較小，危險(xiǎn)截面位于樁-土交界面；碼頭結(jié)構(gòu)后方有高填土?xí)r，后排樁基拉應(yīng)力較大，碼頭前沿樁基應(yīng)力反而較小。在此基礎(chǔ)上，對(duì)類似結(jié)構(gòu)的設(shè)計(jì)提出了一些建議。
[Abstract]:High-pile wharf is a common type of wharf structure in port construction in China, which plays an important role in port construction and development. The previous earthquake damage shows that the structure of high pile wharf is easy to be damaged by earthquake, so it is very important to have enough seismic capacity in its design life. In this paper, considering pile-soil interaction and taking random process as the input of ground motion, the characteristics of random seismic response of high pile wharf are analyzed. The main research contents and results are as follows: 1) the commonly used methods of ground motion input and pile-soil contact simulation are summarized, and the relevant parameters are obtained by referring to the code for seismic design of buildings (GB50011-2010) and the previous research results. The large-scale universal finite element software ABAQUS is used as the platform. A two-dimensional finite element model of high pile wharf is established. 2) the structural natural vibration analysis of the finite element model is carried out, the modal modes of the high pile wharf structure are calculated, and the vibration characteristics and the required modal order of the structure are determined. (3) considering the pile-soil interaction, the response spectrum of the high pile wharf structure is analyzed, and the displacement and stress curves of the structure under three different directions of earthquake excitation are obtained. By analyzing the curves obtained, it is found that the wharf structure capsized forward under horizontal earthquake excitation, and the whole wharf structure moves forward horizontally under vertical earthquake excitation, and horizontal excitation plays a leading role in the deformation of soil and structure. 4) the random seismic response of the finite element model of high pile wharf is analyzed, and the power spectrum curves of structural response displacement and tensile stress under random earthquake excitation are obtained. Then, the power spectrum curve of tensile stress response is analyzed, and the root mean square value of tensile stress in the confidence interval with 75% probability is obtained. It can be concluded that the peak value of the relative displacement power spectrum of the terminal node appears at the lower frequency, and the influence of the high-order mode on the structure response is limited. 5) by comparing the results of response spectrum analysis and random seismic response analysis, it can be seen that the variation trend of displacement and stress curves obtained by the two methods is consistent, and the order of magnitude is the same. But there is a difference between them in numerical value, among which, the maximum value of stress obtained by response spectrum analysis is larger. It can be concluded that the response spectrum analysis is relatively conservative, and it is necessary to analyze the power spectrum of engineering examples. 6) by analyzing the influencing factors of seismic response (such as superstructure type, rear fill, etc.) under earthquake action, it is found that when the upper part is frame structure, the tensile stress at the top of pile is small, and the dangerous section is located at the interface between pile and soil; When there is high fill behind the wharf structure, the tensile stress of the back row pile foundation is larger, but the pile foundation stress at the front end of the wharf is smaller. On this basis, some suggestions for the design of similar structures are put forward.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U656.113

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本文編號(hào)：1964211