鋼筋混凝土系桿拱加固后安全性與舒適性評價(jià)研究
本文選題:鋼筋混凝土系桿拱 + 適用跨徑; 參考:《長安大學(xué)》2014年碩士論文
【摘要】:鋼筋混凝土系桿拱是在公路橋梁中應(yīng)用廣泛的一種拱梁組合體系橋。隨著已建橋梁的老化、橋梁承受的荷載的日趨加重,越來越多的鋼筋混凝土系桿拱出現(xiàn)了不同程度的損傷,并采取了有針對性的加固措施。對橋梁加固效果的評價(jià)研究因而具有了重要的工程意義。 本文以采用增設(shè)柔性吊桿加固的八里店大橋?yàn)橐劳泄こ,,從加固前后橋梁結(jié)構(gòu)的動力特性和動力響應(yīng)方面對加固后橋梁的安全性和舒適性進(jìn)行了評價(jià)。首先,歸納了用于公路橋梁動力分析的參數(shù),選擇了橋梁的動力特性、動位移響應(yīng)、加速度響應(yīng)作為加固效果的評價(jià)指標(biāo);然后,以若干集中力模擬重載交通,通過動位移響應(yīng)對剛性吊桿、剛性系桿、剛性拱的混凝土系桿拱橋進(jìn)行了適用跨徑的分析,經(jīng)過計(jì)算提出了其在重載交通下的最大適用跨徑;在建立了依托工程加固前后的有限元分析模型后,對其進(jìn)行了特征值分析和簡化的車橋耦合分析,結(jié)合加固前后的動力特性、動位移響應(yīng)、加速度峰值的變化對橋梁加固后的安全性從結(jié)構(gòu)剛度方面進(jìn)行了評價(jià);對簡化的車橋耦合分析中得到的加速度時(shí)程數(shù)據(jù)進(jìn)行了處理變換,在得到結(jié)構(gòu)各控制截面豎向加速度均方根后,以其作為振動強(qiáng)度的指標(biāo)對加固后橋梁的行車舒適性進(jìn)行了評價(jià);最后,針對加固之前對原橋進(jìn)行的動載試驗(yàn)不能反應(yīng)車輛通過時(shí)振感強(qiáng)烈這一問題,本文對加固后的動載試驗(yàn)進(jìn)行了有針對性的設(shè)計(jì),對理論分析結(jié)果進(jìn)行驗(yàn)證的同時(shí)建立了對鋼筋混凝土系桿拱適用的安全性和舒適性評價(jià)方法。 本文的研究成果,可為類似鋼筋混凝土系桿拱橋的的經(jīng)驗(yàn)跨徑取值和加固后安全性和舒適性評價(jià)提供一定的借鑒作用。
[Abstract]:The arch of reinforced concrete system is a kind of arch beam combined system bridge which is widely used in highway bridge . With the aging of bridge , the load of bridge is getting more and more , more and more steel bar arch has been damaged in different degrees , and the targeted reinforcement measures have been taken . The research on the evaluation of bridge reinforcement effect has important engineering significance .
In this paper , the safety and comfort of the post - reinforcement bridge are evaluated with the use of the eight - mile bridge with flexible boom reinforcement . First , the parameters for dynamic analysis of highway bridges are summarized , the dynamic characteristics , dynamic displacement response and acceleration response of the bridge are selected as the evaluation indexes of reinforcement effect .
Then , a plurality of concentrated forces are used to simulate heavy - load traffic , and the application span analysis of rigid hanger rod , rigid tie rod and rigid arch concrete tie arch bridge is carried out through dynamic displacement response , and the maximum applicable span under heavy - load traffic is proposed through calculation .
After establishing the finite element analysis model before and after the reinforcement of the project , the characteristic value analysis and the simplified axle coupling analysis are carried out , the dynamic characteristics , the dynamic displacement response and the change of the acceleration peak before and after the reinforcement are combined , and the safety of the bridge reinforcement is evaluated from the structural rigidity ;
The acceleration time history data obtained in the simplified axle coupling analysis is processed and transformed . After obtaining the square root of the vertical acceleration of each control section of the structure , the driving comfort of the post - reinforced bridge is evaluated with the index as the index of vibration strength ;
Finally , aiming at the problem of the dynamic load test on the original bridge before the reinforcement , this paper designs the dynamic load test after reinforcement , and establishes the safety and comfort evaluation method applicable to the reinforced concrete bar arch at the same time .
The research results of this paper can provide some reference for the experience span value and post - reinforcement safety and comfort evaluation of similar reinforced concrete bar arch bridge .
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:U445.72
【參考文獻(xiàn)】
相關(guān)期刊論文 前8條
1 陳悅;周建庭;楊建喜;孫虹微;;基于動力特性的拱橋加固效果評價(jià)[J];重慶交通大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年06期
2 桂水榮;陳水生;許士強(qiáng);;移動荷載下簡支梁橋3種車橋耦合模型研究[J];華東交通大學(xué)學(xué)報(bào);2007年01期
3 李江龍;李巖;盛洪飛;孫航;;基于車橋耦合振動分析的斜拉橋行車舒適性評價(jià)分析[J];科學(xué)技術(shù)與工程;2009年07期
4 張麗芳;艾軍;陳建兵;任曉杰;;橋梁動載試驗(yàn)及其有限元簡化模擬研究[J];武漢理工大學(xué)學(xué)報(bào)(交通科學(xué)與工程版);2013年02期
5 王彥軍;范存新;;過橋車輛對行人舒適度影響的評價(jià)[J];天中學(xué)刊;2010年02期
6 肖新標(biāo),沈火明;3種車橋耦合振動分析模型的比較研究[J];西南交通大學(xué)學(xué)報(bào);2004年02期
7 沈敏;林雪飛;劉多貴;;基于Midas Civil的簡易車橋耦合振動分析[J];西部交通科技;2012年08期
8 蔣培文;賀拴海;宋一凡;王凌波;周勇軍;;簡支梁車橋耦合振動及其影響因素[J];長安大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年01期
相關(guān)博士學(xué)位論文 前1條
1 蔣培文;公路大跨徑連續(xù)體系橋梁車橋耦合振動研究[D];長安大學(xué);2012年
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