橋梁基礎(chǔ)抗震簡化模擬方法適用性研究
發(fā)布時間：2018-11-06 08:30
【摘要】：橋梁基礎(chǔ)的安全性設(shè)計對橋梁工程的重要性不言而喻。在目前的橋梁設(shè)計中,模擬橋梁基礎(chǔ)的樁-土相互作用方面的問題,一直是工作中的難點。這也體現(xiàn)了對相關(guān)課題研究的必要性。因此,本文選取贛州市章江南大道延伸道路工程中一實例連續(xù)梁橋的樁基礎(chǔ)作為研究原型,通過有限元分析軟件midas/Civil,重點考慮橋梁基礎(chǔ)局部結(jié)構(gòu)響應(yīng),對我國目前廣泛使用的樁基礎(chǔ)簡化模擬方法“n倍樁徑嵌固法”作評估。本著探討nd嵌固法精確性和適用性的目的,力求能夠給工程師在橋梁工程設(shè)計工作中提供一定的參考。另外,考慮到場地條件對建筑物的抗震安全性有較大影響,本文提出將規(guī)范中場地的劃分,作為一項影響因素,加入到樁基礎(chǔ)簡化模擬方法評估當中。主要完成以下幾項工作:(1)大量查閱相關(guān)資料后,本文簡明地對橋梁樁基礎(chǔ)簡化模擬的研究發(fā)展現(xiàn)狀做了綜合概述;選擇目前我國工程中廣泛運用的兩種簡化模擬方法:n倍樁徑嵌固法(nd嵌固法)、“m法”作為研究對象。(2)對場地劃分的各項影響因素及評定指標作了簡要概述。并結(jié)合規(guī)范中場地劃分的條件,從大量的鉆孔資料中,選取了多組不同場地劃分的場地剖面作為本文分析工況的場地條件。(3)闡述在midas/Civil中如何實現(xiàn)兩種簡化模擬方法;同時通過對實例橋梁樁基礎(chǔ)的計算分析,與實例橋梁工程計算書中設(shè)計值做比對,驗證建模方法的可行性。(4)使用驗證后的建模方法,對nd嵌固法和m法分別建模:(1)將模型分別在共十數(shù)種靜力工況下進行計算。選擇單樁位移響應(yīng)作為評估指標,以m法結(jié)果為基準,對不同場地條件下,nd嵌固法中的樁徑倍數(shù)“n”的適宜取值進行探討。(2)建立樁基礎(chǔ)局部模型,在18個動力工況下進行動態(tài)時程分析,加入考慮墩臺部位的內(nèi)力及位移響應(yīng)作為參考指標。同樣以m法結(jié)果為基準,探討對不同場地條件下,nd嵌固法中的樁徑倍數(shù)的適宜取值。研究橋梁基礎(chǔ)簡化模擬方法在抗震方面適用性。
[Abstract]:The importance of safety design of bridge foundation to bridge engineering is self-evident. In the current bridge design, it is always difficult to simulate the pile-soil interaction of bridge foundation. This also reflects the necessity of research on related topics. Therefore, this paper selects the pile foundation of a continuous beam bridge as the research prototype in the extending road project of Zhangjiangnan Avenue in Ganzhou City. The local structural response of the bridge foundation is mainly considered by the finite element analysis software midas/Civil,. This paper evaluates the simplified simulation method of pile foundation which is widely used in our country. In order to discuss the accuracy and applicability of nd inlay method, this paper tries to provide a certain reference for engineers in bridge engineering design. In addition, considering that site conditions have a great impact on the seismic safety of buildings, this paper proposes to add the division of site in the code as an influential factor to the evaluation of simplified simulation method for pile foundation. The main works are as follows: (1) after consulting a large number of relevant data, this paper makes a comprehensive overview of the research and development of simplified simulation of bridge pile foundation; This paper selects two simplified simulation methods widely used in our country at present: nd method and m method. (2) the influencing factors and evaluation indexes of site division are briefly summarized. Combined with the condition of site division in the code, from a large number of borehole data, the site profiles of different sites are selected as the site conditions in this paper. (3) how to realize two simplified simulation methods in midas/Civil; At the same time, through the calculation and analysis of the bridge pile foundation, the feasibility of the modeling method is verified by comparing it with the design value in the calculation book of the example bridge engineering. (4) using the verified modeling method, The modeling of nd method and m method are as follows: (1) the model is calculated under ten kinds of static conditions. The displacement response of single pile is selected as the evaluation index. Based on the results of m method, the appropriate value of pile diameter multiple "n" in nd method is discussed under different site conditions. (2) the local model of pile foundation is established. The dynamic time history analysis is carried out under 18 dynamic conditions, and the internal force and displacement response of the pier and abutment are considered as the reference index. On the basis of the results of m method, the appropriate value of pile diameter multiple in nd method is discussed under different site conditions. The applicability of simplified simulation method for bridge foundation in earthquake resistance is studied.
【學位授予單位】：廣州大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U443.1
本文編號：2313742
[Abstract]:The importance of safety design of bridge foundation to bridge engineering is self-evident. In the current bridge design, it is always difficult to simulate the pile-soil interaction of bridge foundation. This also reflects the necessity of research on related topics. Therefore, this paper selects the pile foundation of a continuous beam bridge as the research prototype in the extending road project of Zhangjiangnan Avenue in Ganzhou City. The local structural response of the bridge foundation is mainly considered by the finite element analysis software midas/Civil,. This paper evaluates the simplified simulation method of pile foundation which is widely used in our country. In order to discuss the accuracy and applicability of nd inlay method, this paper tries to provide a certain reference for engineers in bridge engineering design. In addition, considering that site conditions have a great impact on the seismic safety of buildings, this paper proposes to add the division of site in the code as an influential factor to the evaluation of simplified simulation method for pile foundation. The main works are as follows: (1) after consulting a large number of relevant data, this paper makes a comprehensive overview of the research and development of simplified simulation of bridge pile foundation; This paper selects two simplified simulation methods widely used in our country at present: nd method and m method. (2) the influencing factors and evaluation indexes of site division are briefly summarized. Combined with the condition of site division in the code, from a large number of borehole data, the site profiles of different sites are selected as the site conditions in this paper. (3) how to realize two simplified simulation methods in midas/Civil; At the same time, through the calculation and analysis of the bridge pile foundation, the feasibility of the modeling method is verified by comparing it with the design value in the calculation book of the example bridge engineering. (4) using the verified modeling method, The modeling of nd method and m method are as follows: (1) the model is calculated under ten kinds of static conditions. The displacement response of single pile is selected as the evaluation index. Based on the results of m method, the appropriate value of pile diameter multiple "n" in nd method is discussed under different site conditions. (2) the local model of pile foundation is established. The dynamic time history analysis is carried out under 18 dynamic conditions, and the internal force and displacement response of the pier and abutment are considered as the reference index. On the basis of the results of m method, the appropriate value of pile diameter multiple in nd method is discussed under different site conditions. The applicability of simplified simulation method for bridge foundation in earthquake resistance is studied.
【學位授予單位】：廣州大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U443.1
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