【摘要】：我國(guó)公路基礎(chǔ)設(shè)施建設(shè)中,B類(lèi)簡(jiǎn)支梁橋由于構(gòu)造簡(jiǎn)單,設(shè)計(jì)方便,已有標(biāo)準(zhǔn)跨徑的工程通用圖,所以使用廣泛,因此重要線(xiàn)路上簡(jiǎn)支梁橋的抗震安全性和維修加固便捷性對(duì)于確保地震后交通網(wǎng)絡(luò)的暢通至關(guān)重要。本文對(duì)“5·12”汶川地震中的簡(jiǎn)支梁橋震害表現(xiàn)和簡(jiǎn)支梁橋地震損傷過(guò)程進(jìn)行系統(tǒng)的統(tǒng)計(jì)分析,可以看出：位于抗震設(shè)防烈度Ⅷ度及以上烈度地區(qū)的簡(jiǎn)支橋梁,板式橡膠支座出現(xiàn)地震損傷難以避免,且與主梁發(fā)生移位比例接近,可見(jiàn)支座破壞是導(dǎo)致主梁移位的主要原因,而支座破壞對(duì)橋墩具有保護(hù)作用,且汶川地區(qū)橋墩震損率遠(yuǎn)低于其他構(gòu)件的震損率,可見(jiàn)橋墩損壞不是汶川地震簡(jiǎn)支橋梁震害的主要形式。對(duì)簡(jiǎn)支梁橋易損性進(jìn)行分析,歸納出采用板式橡膠支座和橋面連續(xù)的簡(jiǎn)支梁橋最有可能出現(xiàn)的失效路徑是由支座損壞引起主梁位移過(guò)大導(dǎo)致的失效。基于上述結(jié)論論文提出了簡(jiǎn)支梁橋基于性能的支座有限損傷抗震設(shè)計(jì)思想和理論框架,主要目的為在高設(shè)防烈度下容許橋梁支座出現(xiàn)有限損傷來(lái)減小橋墩動(dòng)力響應(yīng),保護(hù)橋墩不受損壞,并結(jié)合工程實(shí)踐提出合理的板式橡膠支座性能目標(biāo)、預(yù)測(cè)橋梁的地震響應(yīng)和采取適當(dāng)?shù)南尬淮胧﹣?lái)限制支座損傷情況,最后利用OpenSees有限元分析軟件通過(guò)大量的計(jì)算分析,討論了橋梁跨度、場(chǎng)地條件、支座摩擦系數(shù)以及抗震設(shè)防烈度對(duì)支座損傷情況的影響,并與汶川震害調(diào)查結(jié)果進(jìn)行對(duì)比驗(yàn)證,提出了B類(lèi)橋梁的支座容許損傷定量指標(biāo)。
[Abstract]:In the construction of highway infrastructure in China, class B simply supported beam bridges are widely used because of their simple structure, convenient design and existing general engineering drawings of standard span. Therefore, the seismic safety and the convenience of maintenance and reinforcement of simply supported beam bridges on important lines are very important to ensure the smooth transportation network after earthquake. In this paper, the seismic damage performance of simply supported beam bridge and the damage process of simply supported beam bridge in the Wenchuan earthquake of "5 12" are systematically analyzed. It can be seen that the simply supported bridge is located in the area of seismic fortification intensity 鈪，

本文編號(hào)：2417431