本文選題：斜拉橋 + 斜塔��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：近年來(lái),斜塔斜拉橋因其橋塔新穎別致、造型流暢輕盈,在小跨徑、寬橋面的城市橋梁中脫穎而出�；旌狭簶蛞蚱淇缭侥芰�(yōu)秀、充分利用材料特性、能夠加快施工進(jìn)度等特點(diǎn)越來(lái)越受到橋梁設(shè)計(jì)師的廣泛關(guān)注。本文以文博路水庫(kù)大橋?yàn)楸尘?通過(guò)有限元軟件MidasCivil建立空間桿系模型對(duì)該混合梁斜塔斜拉橋系統(tǒng)地進(jìn)行了靜力分析和穩(wěn)定分析。研究表明,對(duì)于斜塔斜拉橋,梁截面梯度溫差對(duì)混凝土梁的受力影響較大。由于塔身傾斜導(dǎo)致橋塔彎矩較大,故塔柱截面較為粗壯,橋塔不易發(fā)生失穩(wěn)。同時(shí)主梁失穩(wěn)對(duì)應(yīng)臨界荷載系數(shù)較大,因此采用混合梁斜塔方案可有效提高斜拉橋的穩(wěn)定性。采用混合梁方案可以提高結(jié)構(gòu)的抗震性能,但塔身傾斜不利于橋塔的抗震�；诜磻�(yīng)譜理論和動(dòng)態(tài)時(shí)程理論對(duì)結(jié)構(gòu)的地震響應(yīng)進(jìn)行分析,橋塔屬于結(jié)構(gòu)抗震設(shè)計(jì)中的薄弱環(huán)節(jié),重現(xiàn)期較長(zhǎng)地震發(fā)生時(shí)塔底有發(fā)生破壞的風(fēng)險(xiǎn)。通過(guò)有限元軟件ANSYS建立鋼箱梁局部模型對(duì)鋼橋面板進(jìn)行第二、三體系受力分析。為了確定車(chē)輪荷載對(duì)于該受力體系的最不利加載方案,提出“影響評(píng)級(jí)系數(shù)”評(píng)價(jià)體系。在此基礎(chǔ)上改變鋼箱梁頂板、頂板縱肋與橫隔板厚度進(jìn)行離散性對(duì)比分析。研究表明,城市寬橋面斜拉橋結(jié)構(gòu)橫向效應(yīng)非常突出,適當(dāng)增加橫隔板厚度可有效地改善鋼橋面板的橫向受力問(wèn)題。
[Abstract]:In recent years, the cable-stayed bridge with inclined tower is distinguished from the city bridge with small span and wide deck because of its novel tower and light shape. Bridge designers pay more and more attention to hybrid beam bridge because of its excellent span ability, making full use of material characteristics and accelerating construction progress. Taking Wenbo Road Reservoir Bridge as the background, the static and stability analysis of the hybrid girder cable-stayed bridge with inclined tower is carried out systematically by the finite element software Midas Civil. The results show that the gradient temperature difference of the beam section has a great influence on the stress of the concrete beam for the inclined tower cable-stayed bridge. Because of the larger bending moment of the tower caused by the inclined tower, the section of the tower column is relatively strong, and the tower is not easy to lose stability. At the same time, the stability of cable-stayed bridge can be improved effectively by adopting the scheme of hybrid beam inclined tower, because the corresponding critical load coefficient of the main beam instability is large. The hybrid beam scheme can improve the seismic performance of the structure, but the tilting of the tower is not conducive to the seismic behavior of the bridge tower. Based on the response spectrum theory and the dynamic time history theory, the seismic response of the structure is analyzed. The bridge tower belongs to the weak link in the seismic design of the structure. The local model of steel box girder is established by finite element software ANSYS. In order to determine the most unfavorable loading scheme of wheel load to the load system, an evaluation system of "influence rating coefficient" is put forward. On this basis, the thickness of longitudinal rib and transverse partition of steel box girder is compared and analyzed. The research shows that the transverse effect of cable-stayed bridge structure with wide deck is very prominent and the transverse force of steel bridge slab can be effectively improved by increasing the thickness of transverse diaphragm.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U448.27

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 上官萍，房貞政，，卓衛(wèi)東;塔梁墩固結(jié)斜拉橋結(jié)構(gòu)受力分析[J];福州大學(xué)學(xué)報(bào)(自然科學(xué)版);1999年03期

本文編號(hào)：2021074