本文選題：曲線橋梁　切入點(diǎn)：伸縮縫　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：曲線橋梁是一種為了滿足功能性要求在特定地形條件下所采用的橋梁形式,由于地形的復(fù)雜性和城市空間的限制,曲線橋梁以其獨(dú)特優(yōu)勢(shì)在世界各國(guó)得到廣泛應(yīng)用。地震作用下橋梁結(jié)構(gòu)所發(fā)生的碰撞,是由相鄰橋跨的動(dòng)力特性不一致而產(chǎn)生的異步振動(dòng)所引起的。對(duì)于曲線橋梁而言,橋面曲率的存在使得曲橋橋面存在扭轉(zhuǎn)效應(yīng),導(dǎo)致曲線橋梁比直橋更容易發(fā)生碰撞甚至落梁。本文針對(duì)曲線橋梁在地震作用下的多維地震碰撞問題,以某曲線橋梁為工程背景,研究了不同地面輸入方向下的曲線橋梁的地震響應(yīng)。本文的主要研究?jī)?nèi)容包括:(1)介紹了幾類碰撞模型,并對(duì)兩個(gè)相鄰多自由度不規(guī)則體系的地震碰撞力學(xué)模型進(jìn)行理論推導(dǎo)。根據(jù)原型的空間結(jié)構(gòu)形式和質(zhì)量分布建立三維多自由度模型的運(yùn)動(dòng)方程。針對(duì)不規(guī)則剛體采用集中質(zhì)量法并考慮扭轉(zhuǎn)效應(yīng)得到剛度矩陣、質(zhì)量矩陣和阻尼矩陣�？紤]碰撞接觸區(qū)域的深度和碰撞體幾何形狀以及材料的特性,根據(jù)三維接觸滑移模型得到碰撞力、碰撞阻尼和碰撞剛度等,建立合理的碰撞模型。(2)以實(shí)際曲線橋梁為例,根據(jù)理論推導(dǎo)的碰撞運(yùn)動(dòng)方程進(jìn)行Matlab編程模擬,分析了主要參數(shù)變化對(duì)結(jié)構(gòu)地震碰撞作用的影響,并為試驗(yàn)構(gòu)件的設(shè)計(jì)、振動(dòng)臺(tái)模型裝置的設(shè)計(jì)及不同工況的選擇提供依據(jù)。根據(jù)相似關(guān)系確定模型試件的幾何尺寸、質(zhì)量等,將試件進(jìn)行拼裝并合理布置試驗(yàn)測(cè)試系統(tǒng),進(jìn)行模型的振動(dòng)臺(tái)試驗(yàn),包括不同頻率、幅值、地震動(dòng)輸入方向的簡(jiǎn)諧荷載和實(shí)際地震動(dòng)激勵(lì)。(3)對(duì)曲線橋梁振動(dòng)臺(tái)試驗(yàn)數(shù)據(jù)進(jìn)行分析并進(jìn)行數(shù)值模擬,研究其在不同地震動(dòng)輸入方向、無(wú)碰和碰撞、直橋和曲橋的反應(yīng)對(duì)比中得到曲線橋梁在地震動(dòng)激勵(lì)作用下的動(dòng)力反應(yīng)規(guī)律,并根據(jù)碰撞時(shí)的反應(yīng)進(jìn)行碰撞參數(shù)的識(shí)別,將測(cè)試反應(yīng)與數(shù)值模擬結(jié)果進(jìn)行對(duì)比來(lái)檢驗(yàn)曲線橋梁碰撞理論和模型參數(shù)的正確性和合理性。
[Abstract]:Curved bridge is a kind of bridge which is used to meet the functional requirements under the specific terrain conditions, because of the complexity of the terrain and the constraints of urban space. Curved bridges are widely used in the world because of their unique advantages. The impact of bridge structures under earthquake is caused by asynchronous vibration caused by inconsistent dynamic characteristics of adjacent bridges. The torsional effect of curved bridge deck is caused by the curvature of curved bridge deck, which makes curved bridge more likely to collide and even fall beam than that of straight bridge. In this paper, the multi-dimensional earthquake collision problem of curved bridge under earthquake action is discussed, and a curved bridge is used as the engineering background. The seismic responses of curved bridges with different ground input directions are studied. The seismic collision mechanics model of two adjacent multi-degree-of-freedom irregular systems is derived theoretically. According to the spatial structure form and mass distribution of the prototype, the motion equation of the three-dimensional multi-degree-of-freedom model is established, and the motion equation of the irregular rigid body is established. The stiffness matrix is obtained by using the lumped mass method and considering the torsional effect. Mass matrix and damping matrix. Considering the depth of the collision contact area, the geometry of the collision body and the characteristics of the material, the collision force, impact damping and collision stiffness are obtained according to the three-dimensional contact slip model. A reasonable collision model is established. (2) taking the actual curved bridge as an example, the Matlab programming simulation is carried out according to the equation of collision motion derived from the theory, and the influence of the main parameters on the seismic impact of the structure is analyzed, and the design of the experimental component is given. The design of the shaking table model device and the selection of different working conditions provide the basis. According to the similarity relation, the geometric size and mass of the model specimen are determined, the specimen is assembled and the test system is arranged reasonably, and the shaking table test of the model is carried out. Including harmonic load of different frequency, amplitude, input direction of ground motion and actual ground motion excitation, the test data of curved bridge shaking table are analyzed and numerically simulated. The dynamic response law of curved bridge under ground motion excitation is obtained by comparing the response of straight bridge and curved bridge, and the collision parameters are identified according to the response of impact. The correctness and rationality of the curved bridge collision theory and model parameters are verified by comparing the test results with the numerical simulation results.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55;U448.42

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本文編號(hào)：1669731