發(fā)布時間：2018-11-12 11:21

【摘要】：隨著我國經(jīng)濟(jì)的飛躍發(fā)展,高速鐵路的建設(shè)也進(jìn)入一個全新的階段,遍布我國的高速鐵路網(wǎng)逐漸成型。作為高速鐵路的特點(diǎn)之一就是大量的高架鐵路橋。有些地區(qū)高架橋的比例高達(dá)80%以上。我國高速鐵路建設(shè)速度快的同時,也有一些需要進(jìn)一步提高完善的問題。我國地域遼闊,有很多高速鐵路建設(shè)在地震多發(fā)且高烈度的地區(qū)。而我國還沒有針對高速鐵路橋的專用的設(shè)計(jì)規(guī)范,因此針對高速鐵路橋在強(qiáng)震作用下的破壞機(jī)理和提高高速鐵路橋梁抗震性能的研究十分必要。本文就是在這個前提下,針對高速鐵路橋的破壞機(jī)理進(jìn)行初步理論研究的同時,提出了全新的采用功能分離支座來提高高速鐵路抗震性能的方法。首先連續(xù)化高速鐵路橋梁的上部結(jié)構(gòu)且改變支座為功能分離型新型支座,使高速鐵路橋墩在強(qiáng)震作用下處于基本彈性狀態(tài)以保證高速鐵路橋的地震安全性。針對一座既有高速鐵路橋梁進(jìn)行了有限元分析驗(yàn)證了本方法的有效性。本文的主要研究內(nèi)容如下:1、以按照現(xiàn)行鐵路橋梁設(shè)計(jì)規(guī)范設(shè)計(jì)的跨度為32米的既有高速鐵路橋梁為對象,建立了SAP2000的有限元模型。為了提高橋梁體系的抗震性能,將上部結(jié)構(gòu)連續(xù)化,連續(xù)化跨數(shù)考慮3,5,6,8跨,以得到最優(yōu)化的連續(xù)跨數(shù)。有限元分析時地震作用輸入考慮了單向、雙向以及三向地震動。輸入加速度為9度罕遇地震動峰值加速度的0.64G。通過線性動力時程分析,研究地震動的輸入方向組合對結(jié)構(gòu)主要控制指標(biāo)的影響2、針對連續(xù)化的橋梁,采用纖維鉸模型進(jìn)行非線性動力時程分析,分析工況為水平地震作用為0.2G、0.3 G、0.45 G、0.57 G、0.64 G。1)綜合墩底反力、墩頂位移、上部梁端位移的地震響應(yīng),確定橋墩進(jìn)入屈服狀態(tài)的地震動水準(zhǔn)。2)設(shè)置經(jīng)參數(shù)優(yōu)化后的新型隔震支座,進(jìn)行非線性動力時程分析,確定連續(xù)化的最優(yōu)化跨數(shù)。3、將功能分離型支座通過有限元軟件模擬在已建成的簡支梁型的高鐵橋梁上,進(jìn)行有限元分析驗(yàn)證了本方法的有效性,驗(yàn)證功能分離型支座的方便可行。
[Abstract]:With the rapid development of China's economy, the construction of high-speed railway has entered a new stage. As one of the characteristics of high-speed railway, a large number of elevated railway bridges. In some areas the proportion of viaducts is as high as 80% or more. With the rapid construction of high-speed railway in China, there are some problems that need to be further improved. China has a vast territory and many high-speed railways are built in areas with high earthquake intensity. However, there is no special design code for high-speed railway bridge in China, so it is necessary to study the failure mechanism of high-speed railway bridge under strong earthquake and to improve the seismic performance of high-speed railway bridge. Based on this premise and the preliminary theoretical study on the failure mechanism of high-speed railway bridge, a new method of improving seismic performance of high-speed railway by using functional separation support is put forward in this paper. Firstly, the superstructure of high-speed railway bridge is continuously changed and the support is changed into a new type of functional separation support, which makes the pier of high-speed railway bridge under strong earthquake in a basic elastic state to ensure the seismic safety of high-speed railway bridge. The effectiveness of this method is verified by finite element analysis of an existing high-speed railway bridge. The main contents of this paper are as follows: 1. The finite element model of SAP2000 is established for the existing high-speed railway bridges with a span of 32 meters designed according to the current railway bridge design code. In order to improve the seismic performance of the bridge system, the superstructure is continuous and the continuous span number is taken into account in order to obtain the optimum continuous span number. In finite element analysis, unidirectional, bidirectional and triaxial ground motions are taken into account in seismic input. The input acceleration is 0.64 GG of the peak acceleration of 9 degrees rare ground motion. Through the linear dynamic time history analysis, the influence of the input direction combination of the ground motion on the main control index of the structure is studied. 2. For the continuous bridge, the nonlinear dynamic time history analysis is carried out by using the fiber hinge model. Under the condition of horizontal earthquake, the seismic response of the bottom of the pier, the displacement of the top of the pier and the displacement of the end of the upper beam is synthesized. Determine the level of ground motion at which the pier enters the yield state. 2) set up a new type of isolation bearing after parameter optimization, carry out nonlinear dynamic time history analysis, and determine the continuous optimum span number. The functional separation support is simulated by finite element software on the bridge with simple beam. The validity of the method is verified by finite element analysis, and the convenience and feasibility of the functional separation support are verified.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U442.55

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