【摘要】：預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋具有整體性好、跨越能力大、受力合理、造價適宜、施工技術(shù)嫻熟、行車平順、外形優(yōu)美等優(yōu)點。連續(xù)剛構(gòu)橋通常被應(yīng)用在主跨在100m至250m范圍左右的高墩大跨結(jié)構(gòu)形式之中。但是目前連續(xù)剛構(gòu)橋梁在抗震設(shè)計中主要采用偏于保守的經(jīng)驗來設(shè)計然后用計算來驗證,而且對于一些設(shè)計缺陷也沒有引起足夠的重視,所以對不同參數(shù)的連續(xù)剛構(gòu)橋進(jìn)行動力響應(yīng)研究是十分有必要的。論文以實際工程中的一座高墩大跨預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋為背景,選取了上部結(jié)構(gòu)參數(shù)中的邊中跨比、梁底拋物線次數(shù)、0號塊梁高、跨中梁高以及下部結(jié)構(gòu)中的橫系梁根數(shù)作為優(yōu)化變量。分別考慮上部參數(shù)對橋梁地震響應(yīng)影響、橫系梁對橋梁地震響應(yīng)的影響以及上下部結(jié)構(gòu)參數(shù)同時考慮對橋梁地震響應(yīng)影響進(jìn)行了正交試驗分析,主要完成的工作如下:(1)介紹了常用橋梁的主要震害,中國以及日本抗震規(guī)范的發(fā)展歷程,國內(nèi)外專家學(xué)者對橋梁抗震研究的現(xiàn)狀,對橋梁抗震分析方法以及優(yōu)化方法進(jìn)行了簡單的介紹。(2)對目前國內(nèi)外部分已建成的連續(xù)剛構(gòu)橋的參數(shù)進(jìn)行歸納整理,得出了相應(yīng)的使用范圍,并根據(jù)所選用的工程背景的地震設(shè)防等級,選取多個不同的目標(biāo)函數(shù)。首先只考慮上部結(jié)構(gòu)參數(shù)時,建立了 25個參數(shù)各異的正交模型,地震波選用相同“縱向+橫向+縱向”組合。針對各個不同優(yōu)化目標(biāo),在彈性狀態(tài)和彈塑性狀態(tài)下尋找出各自的最優(yōu)參數(shù)組合;通過極差分析以及方差分析,找出各個參數(shù)對橋梁抗震的影響效果。(3)只考慮下部結(jié)構(gòu)參數(shù)中的橫系梁根數(shù),建立不同的模型,地震波選用相同“縱向+橫向+縱向”組合。分析了結(jié)構(gòu)在彈性狀態(tài)下和彈塑性狀態(tài)下,針對不同的目標(biāo)函數(shù)尋出最后的橫系梁根數(shù)。(4)將上部參數(shù)和橫系梁根數(shù)統(tǒng)一起來作為結(jié)構(gòu)參數(shù)考慮,建立了 25個參數(shù)正交各異的模型,地震波選用相同“縱向+橫向+縱向”組合。針對選取的各個不同目標(biāo),尋找出其在塑性階段的最優(yōu)參數(shù)組合。通過極差分析,找出各參數(shù)對橋梁抗震的影響效果。
[Abstract]:Prestressed concrete continuous rigid frame bridge has the advantages of good integrity, large span capacity, reasonable force, suitable cost, skillful construction technology, smooth running and beautiful appearance. Continuous rigid frame bridge is usually used in the structure of high pier and large span with the main span between 100m and 250m. However, at present, the continuous rigid frame bridges are mainly designed by conservative experience in seismic design and then verified by calculation, and some design defects are not paid enough attention to. So it is necessary to study the dynamic response of continuous rigid frame bridge with different parameters. In this paper, a prestressed concrete continuous rigid frame bridge with high piers and long spans is used as the background. The ratio of side to middle span, the number of parabola at the bottom of beam, and the height of block 0 beam are selected. The height of mid-span beam and the root number of transverse beam in the substructure are taken as optimization variables. The influence of upper parameters on bridge seismic response, the influence of transverse beam on bridge seismic response and the influence of upper and lower structural parameters on bridge seismic response are considered respectively. The main works are as follows: (1) the main earthquake damage of common bridges, the development of seismic codes in China and Japan, and the current situation of seismic research on bridges by experts and scholars at home and abroad are introduced. The aseismic analysis methods and optimization methods of bridges are introduced briefly. (2) the parameters of continuous rigid frame bridges which have been built at home and abroad are summarized and arranged, and the corresponding application scope is obtained. Several different objective functions are selected according to the earthquake fortification level of the engineering background. First, 25 orthogonal models with different parameters are established when the superstructure parameters are only considered, and the seismic wave is composed of the same longitudinal and transverse direction. According to different optimization targets, the optimal parameter combination is found in elastic state and elastic-plastic state. By means of range analysis and variance analysis, the effect of each parameter on seismic resistance of bridge is found out. (3) considering only the root number of transverse beam in substructure parameters, different models are established. The seismic wave is composed of the same "longitudinal transverse longitudinal" combination. In this paper, the final root number of transverse beam is found for different objective functions in elastic state and elastic-plastic state. (4) the upper parameter and the root number of transverse beam are unified as structural parameters. In this paper, 25 models with different orthogonal parameters are established, and the seismic waves are composed of the same "longitudinal and transverse longitudinal". The optimal combination of parameters in plastic stage is found for different targets. By means of range analysis, the effect of each parameter on bridge seismic resistance is found out.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U442.55;U448.23

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 易繼軍;李艷梅;榮見華;曾韜;;考慮位移約束的結(jié)構(gòu)布局優(yōu)化方法[J];中國機(jī)械工程;2012年24期

2 趙艷敏;霍達(dá);;基于遺傳模擬退火算法的鋼桁架結(jié)構(gòu)優(yōu)化設(shè)計[J];鄭州大學(xué)學(xué)報(工學(xué)版);2011年06期

3 黃信;李忠獻(xiàn);;動水壓力作用對深水橋墩地震響應(yīng)的影響[J];土木工程學(xué)報;2011年01期

4 王東升;孫治國;李曉莉;霍q，

本文編號：2302346