【摘要】：模型試驗(yàn)是研究復(fù)雜橋梁結(jié)構(gòu)的一種常用手段,但利用全橋模型試驗(yàn)來研究復(fù)雜橋梁結(jié)構(gòu)施工階段的文獻(xiàn)非常稀少。以位于剛果的一座小半徑混凝土曲線斜拉橋?yàn)楣こ瘫尘?進(jìn)行了全橋模型的靜力設(shè)計(jì)及試驗(yàn)研究。主要研究?jī)?nèi)容包括以下幾個(gè)方面:(1)總結(jié)了曲線斜拉橋的發(fā)展?fàn)顩r及特點(diǎn),介紹了橋梁模型試驗(yàn)的研究現(xiàn)狀及相似原理,包括全幾何相似設(shè)計(jì)中的相似關(guān)系及多相材質(zhì)的相似關(guān)系。(2)針對(duì)模型試驗(yàn)的目的及現(xiàn)有的實(shí)際條件,提出了曲線斜拉橋模型試驗(yàn)的模型設(shè)計(jì)總體思路。結(jié)合實(shí)驗(yàn)室實(shí)際條件,確定了 1:20的縮尺模型比例,并推導(dǎo)了模型橋試驗(yàn)的靜力相似關(guān)系。(3)基于剛度相似原理對(duì)模型橋進(jìn)行了設(shè)計(jì),為驗(yàn)證該設(shè)計(jì)方法及靜力相似關(guān)系的正確性,建立了模型橋理想模型。通過該理想模型的有限元數(shù)值計(jì)算結(jié)果與調(diào)整后的原型橋監(jiān)控模型結(jié)果的對(duì)比分析,結(jié)果表明基于"剛度相似原理"設(shè)計(jì)的模型橋,其設(shè)計(jì)合理,主梁內(nèi)力與原橋滿足相似關(guān)系,模型橋靜力相似關(guān)系推導(dǎo)正確。(4)結(jié)合試驗(yàn)場(chǎng)地及實(shí)驗(yàn)室實(shí)際條件,對(duì)模型試驗(yàn)中試驗(yàn)橋進(jìn)行了構(gòu)件設(shè)計(jì)、配重設(shè)計(jì)及邊界條件設(shè)計(jì)。針對(duì)試驗(yàn)橋的特點(diǎn),采用雙梁+板模擬復(fù)雜受力П型主梁的方式對(duì)試驗(yàn)橋進(jìn)行了有限元分析。(5)根據(jù)試驗(yàn)?zāi)康拇_定了試驗(yàn)工況、測(cè)點(diǎn)布置及試驗(yàn)流程。根據(jù)試驗(yàn)場(chǎng)地條件,介紹了試驗(yàn)中采用的調(diào)索裝置及調(diào)索方法,即測(cè)試斜拉橋各拉索索力調(diào)整變化曲線,利用該曲線及Matlab程序?qū)崿F(xiàn)對(duì)斜拉橋模型的調(diào)索。(6)通過模型橋?qū)嶋H測(cè)試結(jié)果與理論模型分析結(jié)果比較分析,表明試驗(yàn)各工況中結(jié)構(gòu)的實(shí)際受力狀態(tài)與理論模型的受力狀態(tài)基本一致,從而驗(yàn)證了本文采用的數(shù)值計(jì)算方法在用于空間復(fù)雜受力的Ⅱ型截面曲線斜拉橋的受力分析是可靠的。
[Abstract]:Model test is a common method to study complex bridge structure, but the literature on the construction stage of complex bridge structure by full-bridge model test is very rare. Taking a small radius concrete curved cable-stayed bridge in Congo as the engineering background, the static design and experimental study of the whole bridge model are carried out. The main research contents are as follows: (1) the development and characteristics of curved cable-stayed bridge are summarized, and the research status and similarity principle of bridge model test are introduced. It includes the similarity relation in the whole geometric similarity design and the similarity relation of the multiphase material. (2) according to the purpose of the model test and the existing practical conditions, the general idea of the model design of the curved cable-stayed bridge model test is put forward. Combined with the actual conditions of the laboratory, the scale of the scale model of 1:20 is determined, and the static similarity relation of the model bridge test is deduced. (3) based on the principle of stiffness similarity, the model bridge is designed. In order to verify the correctness of the design method and the static similarity relationship, the ideal model of the model bridge is established. The finite element numerical results of the ideal model are compared with the results of the adjusted prototype bridge monitoring model. The results show that the design of the model bridge based on the "stiffness similarity principle" is reasonable. The internal force of the main beam is similar to the original bridge, and the static similarity relation of the model bridge is derived correctly. (4) combined with the actual conditions of the test site and laboratory, the design of component, counterweight and boundary conditions are carried out for the test bridge in the model test. According to the characteristics of the test bridge, the finite element analysis of the test bridge is carried out by means of the double beam plate simulating the complex force of the main beam. (5) according to the test purpose, the test conditions, the layout of the measuring points and the test flow are determined. According to the conditions of the test site, this paper introduces the cable adjusting device and the cable adjusting method used in the test, that is, testing the changing curve of the cable force of each cable in the cable-stayed bridge. Using the curve and Matlab program, the cable adjustment of the cable-stayed bridge model is realized. (6) the actual test results of the model bridge are compared with the theoretical model analysis results. The experimental results show that the actual stress state of the structure is basically consistent with that of the theoretical model, which verifies that the numerical calculation method used in this paper is reliable in the analysis of the stress of the curved cable-stayed bridge of type 鈪，

本文編號(hào)：2271568