本文關(guān)鍵詞：基于延性的中小跨公路梁橋抗震細(xì)化設(shè)計(jì)研究　出處：《南京工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 中小跨公路橋梁 橋梁抗震 墩柱延性 多級性能目標(biāo) 細(xì)化設(shè)計(jì) 能力保護(hù)構(gòu)件

【摘要】：通過對國內(nèi)外主要震害的調(diào)研發(fā)現(xiàn),墩柱抗剪承載力不足和延性能力不足是造成墩柱破壞的重要原因。確保橋墩在地震作用下具有良好的延性和耗能能力,是實(shí)現(xiàn)橋梁結(jié)構(gòu)基于性能抗震設(shè)計(jì)的重要前提。我國的《公路橋梁抗震設(shè)計(jì)細(xì)則》(JTG/T B02-01-2008)對如何實(shí)現(xiàn)延性抗震設(shè)計(jì),特別是考慮不同性能要求的延性設(shè)計(jì)并沒有具體規(guī)定；對能力保護(hù)構(gòu)件的驗(yàn)算規(guī)定得也比較宏觀,無法體現(xiàn)橋梁的不同性能要求。因此,很有必要從性能設(shè)計(jì)的角度,深化和細(xì)化橋梁的延性設(shè)計(jì)。本文采用調(diào)研分析、理論計(jì)算和數(shù)值模擬相結(jié)合的方法進(jìn)行研究。本文的主要成果如下：(1)明確了墩柱延性的評價(jià)指標(biāo)及量化標(biāo)準(zhǔn)。在已有的相關(guān)規(guī)范及研究成果的基礎(chǔ)上,全面了解國內(nèi)外對于墩柱延性程度的劃分及延性指標(biāo)的量化標(biāo)準(zhǔn),初步確定延性指標(biāo)。對位移延性系數(shù)、曲率延性系數(shù)、位移角三個(gè)指標(biāo)之間的相互關(guān)系進(jìn)行研究,并提出以位移延性系數(shù)作為衡量橋梁整體結(jié)構(gòu)的延性水平的指標(biāo)。(2)提出了中小跨徑公路橋梁的多級延性性能水平評價(jià)標(biāo)準(zhǔn)。建議將中小跨徑公路橋梁的多級性能水平設(shè)定為：性能Ⅰ—在E1地震作用下橋梁結(jié)構(gòu)處于彈性狀態(tài),在E2地震作用下墩柱出現(xiàn)輕微損傷；性能Ⅱ—在E1地震作用下橋梁結(jié)構(gòu)處于彈性狀態(tài),在E2地震作用下墩柱出現(xiàn)可修復(fù)損傷；性能Ⅲ-在E1地震作用下橋梁結(jié)構(gòu)處于彈性狀態(tài),在E2地震作用下墩柱出現(xiàn)重大損傷,但不倒塌。(3)給出了公路橋梁墩柱受剪承載力計(jì)算公式的改進(jìn)建議。明確了縱橋向和橫橋向最不利軸力的確定方法；對墩柱抗剪設(shè)計(jì)沒有考慮墩柱不同延性能力的要求,參考《Caltrans規(guī)范》的規(guī)定,引入位移延性系數(shù)將墩柱的延性要求與墩柱的受剪承載力相聯(lián)系。(4)系統(tǒng)分析了截面形式混凝土強(qiáng)度、縱筋、箍筋等因素對墩柱延性能力的影響規(guī)律,并提出了具體的設(shè)計(jì)建議。同時(shí)就軸力變化對墩柱橫橋向的延性能力影響進(jìn)行了初步研究。(5)明確和細(xì)化了基于延性能力、需求相一致的簡化設(shè)計(jì)方法。該簡化方法適用于可以簡化為單自由度體系的一般規(guī)則的中小跨徑公路橋梁,可以實(shí)現(xiàn)延性能力與延性需求相一致的性能目標(biāo)。(6)提出了基于多級延性性能目標(biāo)的設(shè)計(jì)思路及實(shí)現(xiàn)方法,并結(jié)合具體典型橋梁提出實(shí)現(xiàn)不同延性能力及性能目標(biāo)的設(shè)計(jì)方案。針對板橋和組合梁橋,利用Pushover方法,采用基于能力的設(shè)計(jì)方法,提出滿足多種性能能力的設(shè)計(jì)方案。
[Abstract]:Through the investigation of the main earthquake damage at home and abroad, it is found that the insufficient shear bearing capacity and ductility capacity of the pier column are the important reasons to cause the damage of the pier column, and ensure that the pier has good ductility and energy dissipation ability under the earthquake action. It is an important premise to realize the performance-based seismic design of bridge structure. JTG / T / T B02-01-2008 of our country's "detailed rules for Seismic Design of Highway Bridges" is how to realize the ductile seismic design. In particular, the ductility design considering different performance requirements is not specified; The checking calculation of the capacity protection component is also macroscopical, which can not reflect the different performance requirements of the bridge. Therefore, it is necessary to design from the point of view of performance. To deepen and refine the ductility design of bridges. The main results of this paper are as follows: 1) the evaluation index and quantitative standard of ductility of pier column are defined. Based on the existing related specifications and research results, the main results of this paper are as follows: (1) the main results of this paper are as follows: (1) the evaluation index and quantitative standard of ductility of pier column are defined. Comprehensive understanding of the classification of ductility degree and the quantitative criteria of ductility index at home and abroad, the preliminary determination of ductility index, displacement ductility coefficient, curvature ductility coefficient. The relationship between the three indexes of displacement angle is studied. The displacement ductility coefficient is put forward as the index to measure the ductility level of the whole bridge structure. The evaluation standard of multi-stage ductility performance of medium and small span highway bridges is put forward. It is suggested that the multistage performance level of medium and small span highway bridges should be set as follows: performance 鈪，

本文編號：1398805