本文關(guān)鍵詞： 獨(dú)柱支承曲線梁橋 受力特性 抗傾覆穩(wěn)定性 支座優(yōu)化　出處：《蘭州交通大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：曲線梁橋的“彎—扭”耦合效應(yīng)使得其在對稱荷載作用下也會產(chǎn)生很大的扭轉(zhuǎn)變形,在偏載作用下,效應(yīng)更為明顯。尤其對于中間點(diǎn)鉸支座不傳遞扭矩的獨(dú)柱支承曲線梁橋來說,其梁端扭矩極其巨大,過大的扭轉(zhuǎn)變形必將導(dǎo)致該類橋梁的穩(wěn)定性儲備不足的問題。因此,在獨(dú)柱支承曲線梁橋的設(shè)計(jì)過程中,如何改善其受力狀態(tài)以及提高結(jié)構(gòu)的穩(wěn)定性是首要解決的問題。再者,通過支座優(yōu)化設(shè)計(jì)可以有效改善該類橋梁的受力狀態(tài)。本文根據(jù)已有理論的基礎(chǔ)上,采用數(shù)值模擬的方法對影響曲線梁橋受力特性的主要因素進(jìn)行分析,并對獨(dú)柱支承曲線梁橋支座優(yōu)化設(shè)計(jì)進(jìn)行深入的研究。主要完成的工作如下:(1)闡述了曲線梁橋的應(yīng)用概況以及工程事故概況,進(jìn)一步提出了獨(dú)柱支承曲線梁橋存在的問題;(2)通過建立曲線梁微段的平衡方程、幾何方程以及曲線梁內(nèi)力與變形的關(guān)系推導(dǎo)出三個(gè)用位移分量表示的曲線梁平衡微分方程,進(jìn)一步得出影響結(jié)構(gòu)受力特性的主要因素;(3)通過建立相同跨徑組合的直線梁橋以及曲線梁橋的有限元模型,對其內(nèi)力、變形以及支反力進(jìn)行對比,得到曲線梁橋獨(dú)有的受力特點(diǎn);通過對曲線梁橋抗傾覆穩(wěn)定性驗(yàn)算依據(jù)的相關(guān)介紹以及驗(yàn)算方法的對比,得出一種偏于安全的驗(yàn)算方法;(4)通過設(shè)置曲率半徑及跨中橫隔梁數(shù)為參數(shù),改變其取值,研究曲率半徑對曲線梁橋受力特性的影響以及橫隔梁布置對減小截面畸變作用的貢獻(xiàn),最后探討二者對結(jié)構(gòu)抗傾覆穩(wěn)定性的影響;(5)介紹曲線梁橋常用的三種支座設(shè)置方法,通過改變其支承形式,對比不同支承形式對結(jié)構(gòu)受力特性以及抗傾覆穩(wěn)定性的影響;(6)介紹支座偏心調(diào)整獨(dú)柱支承曲線梁橋扭矩的原理及方法;通過設(shè)置中支點(diǎn)預(yù)偏心距和端支座橫向間距為參數(shù),改變其取值,分析中支座預(yù)偏心及端支座橫向間距對結(jié)構(gòu)受力特性及抗傾覆穩(wěn)定性的影響;并得出不同曲率半徑獨(dú)柱支承曲線梁橋支座優(yōu)化目標(biāo)的確定原則。
[Abstract]:The coupling effect of "bending and torsion" of curved girder bridge makes it also produce great torsional deformation under symmetrical load, and under the action of partial load, The effect is more obvious. Especially for the single-column supported curved girder bridge with untransmitted torque, the torsional moment at the end of the beam is extremely huge, and the excessive torsional deformation will inevitably lead to the shortage of the stability reserve of this kind of bridge. In the design process of single-column supported curved girder bridge, how to improve the stress state and the stability of the structure is the most important problem to be solved. The stress state of this kind of bridge can be effectively improved by the support optimization design. Based on the existing theories, the main factors affecting the stress characteristics of curved beam bridges are analyzed by numerical simulation method in this paper. The main work is as follows: (1) the application of curved girder bridge and the general situation of engineering accidents are expounded. Furthermore, the problem of curved beam bridge supported by single column is put forward. By establishing the equilibrium equation, geometric equation and the relationship between the internal force and deformation of the curved beam, three differential equations of equilibrium of curved beam expressed by displacement components are derived. Furthermore, the main factors affecting the mechanical characteristics of the structure are obtained. By establishing the finite element model of the linear beam bridge and the curved beam bridge with the same span combination, the internal force, deformation and supporting reaction force of the bridge are compared. The unique stress characteristics of curved girder bridge are obtained, and the relative introduction and comparison of checking calculation methods for the overturning stability of curved girder bridge are given. By setting the curvature radius and the number of mid-span transverse beams as parameters, we can change the values, study the influence of curvature radius on the stress characteristics of curved girder bridges and the contribution of the layout of the transverse beams to the reduction of cross-section distortion. Finally, the influence of the two on the overturning stability of the structure is discussed. (5) the three kinds of support setting methods used in curved girder bridges are introduced, and the supporting forms are changed. This paper introduces the principle and method of supporting eccentric adjustment of torsion of curved girder bridge supported on single column by comparing the influence of different supporting forms on the mechanical characteristics and overturning stability of the structure, and sets the pre-eccentricity of support point and the transverse distance of end support as parameters, and introduces the principle and method of adjusting the torque of curved girder bridge supported by single column by eccentricity. The influence of eccentricity and lateral distance between end and end supports on the mechanical characteristics of the structure and the stability against overturning are analyzed, and the principle of determining the optimal support objective of curved girder bridge with different curvature radius is obtained.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U441;U448.21

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