發(fā)布時(shí)間：2018-07-27 09:21

【摘要】：摘要：強(qiáng)震作用下,簡(jiǎn)支梁橋支座容易發(fā)生破壞導(dǎo)致相鄰梁體和梁臺(tái)間發(fā)生碰撞,從而造成梁體的損壞或者落梁。嚴(yán)重的碰撞會(huì)直接會(huì)導(dǎo)致橋梁交通中斷并且短時(shí)間內(nèi)無法恢復(fù)交通通行能力,不僅造成直接經(jīng)濟(jì)損失,而且給后續(xù)的救災(zāi)帶來很大不便,故需要采取合適的控制措施。限位索作為一種原理清晰、布置方便、形式簡(jiǎn)單的梁體位移控制措施,在國(guó)外已有應(yīng)用,然而在國(guó)內(nèi)研究卻相對(duì)較少。本文以公路簡(jiǎn)支梁橋?yàn)楣こ瘫尘?在梁體間和梁臺(tái)間引入限位索,開展防碰撞研究,主要內(nèi)容和成果如下： (1)利用有限元軟件ANSYS建立了一座四跨(4×30m)公路簡(jiǎn)支梁橋全橋碰撞有限元模型。其中,采用Kelvin模型來模擬梁間碰撞,采用非線性彈簧單元來模擬支座。 (2)分析了簡(jiǎn)支梁橋分別在調(diào)幅加速度峰值為0.15g、0.30g、0.60g的EL-Centro波、Taft波、Takochi-oki波和天津波等地震波激勵(lì)作用下的碰撞效應(yīng),結(jié)果表明：地震響應(yīng)與結(jié)構(gòu)振動(dòng)特性、地震波譜特性有關(guān)；隨加速度峰值增大,響應(yīng)加劇。 (3)進(jìn)行了碰撞效應(yīng)參數(shù)分析,通過改變相鄰橋墩墩高比、鄰梁間距、碰撞單元阻尼等參數(shù),獲得了不同參數(shù)變化對(duì)碰撞效應(yīng)的影響規(guī)律,結(jié)果表明：墩高越高,位移響應(yīng)越大；碰撞力和碰撞次數(shù)隨鄰梁間距增大而減小。 (4)在鄰梁和梁臺(tái)間引入限位索,開展了簡(jiǎn)支梁橋防碰撞研究,分析了拉索數(shù)量變化和不同地震激勵(lì)作用下的結(jié)構(gòu)響應(yīng)。限位索可有效減小梁體位移,避免鄰梁和梁臺(tái)間發(fā)生碰撞,降低落梁幾率；且隨拉索數(shù)量增加防碰減震效果越明顯。
[Abstract]:Absrtact: under the action of strong earthquake, simply supported beam bridge supports are easily destroyed, resulting in the collision between adjacent beam body and beam platform, which results in the damage or fall of beam body. Serious collision will directly lead to the interruption of bridge traffic and the inability to restore traffic capacity in a short time, which not only causes direct economic losses, but also brings great inconvenience to the subsequent disaster relief, so appropriate control measures should be taken. As a kind of beam displacement control measure with clear principle, convenient arrangement and simple form, limit cable has been applied in foreign countries, but it has been studied less in our country. In this paper, based on the engineering background of highway simply supported beam bridge, the limited cable is introduced between beam body and beam platform, and anti-collision research is carried out. The main contents and results are as follows: (1) A four-span (4 脳 30m) finite element model for the impact of a four-span (4 脳 30m) highway simply supported beam bridge is established by using the finite element software ANSYS. The Kelvin model is used to simulate the collision between beams. The nonlinear spring element is used to simulate the support. (2) the collision effect of the simply supported bridge under the excitation of seismic waves such as Takochi-oki wave and Tianjin wave is analyzed under the excitation of the EL-Centro wave with the peak amplitude modulation of 0.30g / 0.60g. The results show that the seismic response is related to the structural vibration characteristics and the seismic spectrum characteristics, and the response intensifies with the increase of the peak acceleration. (3) the impact effect parameters are analyzed, by changing the height ratio of the adjacent piers and the distance between adjacent beams. The effects of different parameters on the impact effect are obtained. The results show that the higher the pier height, the greater the displacement response. The impact force and the number of collisions decrease with the increase of the distance between adjacent beams. (4) by introducing limited cables between adjacent beams and beam abutments, the anti-collision research of simply supported beam bridges is carried out, and the structural responses under different earthquake excitation and the number of cables are analyzed. The limit cable can effectively reduce the displacement of the beam, avoid the collision between the adjacent beam and the beam abutment, and reduce the probability of falling beam, and with the increase of the number of cables, the more obvious the anti-collision effect is.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55;U448.217

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