發(fā)布時(shí)間：2018-06-05 15:28

  本文選題：鋼筋混凝土柱 + 抗震性能��； 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：鋼筋混凝土橋墩在地震作用下極易發(fā)生破壞,且不同破壞模式表現(xiàn)出的抗震性能也不同。開展鋼筋混凝土橋墩地震破壞模式和滯回性能數(shù)值模擬的研究,是揭示橋梁地震破壞機(jī)理、認(rèn)識(shí)橋梁抗震能力的前提和保證。本文在對(duì)比現(xiàn)有的橋墩破壞模式判別方法的基礎(chǔ)上,建立了不同破壞模式下橋墩滯回性能模擬。本文的主要工作如下：1.根據(jù)美國太平洋地震研究中心鋼筋混凝土橋墩抗震性能試驗(yàn)數(shù)據(jù)庫,選取了共計(jì)56根的彎曲破壞、彎剪破壞、剪切破壞實(shí)驗(yàn)柱�；谶@些試驗(yàn)數(shù)據(jù),對(duì)劉鳴、Zhu、馬穎三人提出的鋼筋混凝土橋墩破壞模式判別方法進(jìn)行了判錯(cuò)率對(duì)比分析,結(jié)果表明,zhu提出的兩區(qū)域劃分法最適合用來預(yù)判鋼筋混凝土柱的破壞模式。2.基于兩區(qū)域劃分法,建立了不同破壞模式下橋墩的數(shù)值分析模型。針對(duì)落在F區(qū)域的橋墩建立了考慮彎曲效應(yīng)和縱筋拔出效應(yīng)的數(shù)值分析模型,針對(duì)落在S區(qū)域的橋墩建立了考慮彎曲效應(yīng)、剪切效應(yīng)及拔出效應(yīng)的數(shù)值分析模型。分別通過6根彎曲破壞、6根剪切破壞、6根彎剪破壞試驗(yàn)柱對(duì)模型進(jìn)行了驗(yàn)證。3.針對(duì)空心墩破壞模式判別非常困難這一特點(diǎn),基于孫治國等提出的矩形空心墩抗震變形能力的統(tǒng)一計(jì)算公式,通過Opensees分析平臺(tái)中提供的極限狀態(tài)材料模型實(shí)現(xiàn)這一公式,在此基礎(chǔ)上建立了不同破壞模式下的矩形空心墩統(tǒng)一計(jì)算模型。模型中以空心墩變形能力統(tǒng)一計(jì)算公式定義試件嚴(yán)重破壞階段的起始時(shí)刻位移,由此考慮橋墩由于剪切或彎曲破壞引起的承載力和剛度退化行為。最終通過7個(gè)不同破壞形態(tài)矩形空心墩柱對(duì)滯回分析模型進(jìn)行了驗(yàn)證。
[Abstract]:Reinforced concrete pier is prone to damage under earthquake, and the seismic behavior of different failure modes is different. The study of seismic failure mode and hysteretic behavior of reinforced concrete pier is the premise and guarantee to reveal the seismic failure mechanism of bridge and to understand the seismic capacity of bridge. In this paper, based on the comparison of existing bridge pier failure modes, simulation of pier hysteretic performance under different failure modes is established. The main work of this paper is as follows: 1. According to the seismic performance test database of reinforced concrete pier of Pacific Seismic Research Center, 56 experimental columns of bending failure, flexural shear failure and shear failure were selected. On the basis of these experimental data, a comparative analysis of the fault rate of reinforced concrete pier failure mode proposed by Liu Ming, Zhu and Ma Ying was made. The results show that the two-zone partition method proposed by Chen Zhu is the most suitable for predicting the failure mode of reinforced concrete columns. Based on the two-region partition method, a numerical analysis model of bridge pier under different failure modes is established. A numerical analysis model considering bending effect and longitudinal rib pull-out effect is established for pier falling in F region, and a numerical analysis model considering bending effect, shear effect and pull-out effect is established for pier falling in S region. The model was verified by 6 bending failure and 6 shear failure test columns. In view of the fact that it is very difficult to distinguish the failure modes of hollow piers, based on the unified formula of seismic deformation capacity of rectangular hollow piers put forward by Sun Zhiguo et al, this formula is realized through the material model of limit state provided in the Opensees analysis platform. On this basis, the unified calculation model of rectangular hollow pier under different failure modes is established. In the model, the deformation capacity of hollow pier is used to define the initial moment displacement of the specimen in the serious failure stage, and the bearing capacity and stiffness degradation behavior of the pier due to shear or bending failure is considered. Finally, the hysteretic analysis model was validated by 7 rectangular hollow columns with different failure patterns.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U443.22

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本文編號(hào)：1982467