本文選題：混合梁斜拉橋 + 隨機(jī)振動��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：近些年,斜拉橋發(fā)展迅速,跨度也由幾百米增大到千米級,而隨著跨度的增大,其抗震設(shè)計也變得復(fù)雜,因此對其進(jìn)行地震分析十分必要。地震具有明顯的隨機(jī)性,采用隨機(jī)振動法對斜拉橋進(jìn)行抗震分析顯然是合理的。論文利用有限元分析軟件ANSYS,以鄂東大橋?yàn)楣こ瘫尘?采用隨機(jī)振動分析法計算分析了混合梁斜拉橋在一致激勵和非一致激勵下的地震響應(yīng),并通過結(jié)構(gòu)地震響應(yīng)的功率譜探討了結(jié)構(gòu)地震響應(yīng)的機(jī)理。計算結(jié)果表明,縱向一致激勵下,結(jié)構(gòu)的順橋向響應(yīng)較大,其余兩個方向的響應(yīng)很小；橫向一致激勵下時結(jié)構(gòu)的響應(yīng)特點(diǎn)與縱向一致激勵時相似,僅是橫橋向響應(yīng)較大；豎向一致激勵時,除豎向響應(yīng)較大外,結(jié)構(gòu)的順橋向響應(yīng)和橫向響應(yīng)也較大；三維一致激勵下結(jié)構(gòu)的地震響應(yīng)比一維一致激勵時明顯要大。對結(jié)構(gòu)的非一致激勵分析主要考慮了行波效應(yīng)、部分相干效應(yīng)和局部場地效應(yīng),計算結(jié)果表明,考慮行波效應(yīng)后結(jié)構(gòu)的地震響應(yīng)有所下降,對抗震設(shè)計有利；考慮部分相干效應(yīng)后的結(jié)構(gòu)響應(yīng)比不考慮相干效應(yīng)時響應(yīng)明顯要大,而比完全相干時的響應(yīng)稍小；考慮局部場地效應(yīng)后結(jié)構(gòu)的響應(yīng)和一致激勵時的響應(yīng)相差很小,說明局部場地效應(yīng)結(jié)構(gòu)的地震響應(yīng)影響不明顯。無論是一致激勵還是非一致激勵,混合梁斜拉橋總是邊跨混凝土梁段內(nèi)力響應(yīng)大位移響應(yīng)小,而中跨鋼梁段內(nèi)力響應(yīng)小位移響應(yīng)大。同時本文通過結(jié)構(gòu)響應(yīng)功率譜分析,確定了各工況下結(jié)構(gòu)各響應(yīng)的控制振型,闡明了結(jié)構(gòu)的地震響應(yīng)機(jī)理。
[Abstract]:In recent years, the cable-stayed bridge has developed rapidly and the span has also increased from several hundred meters to a thousand meters. With the increase of the span, the seismic design of the cable-stayed bridge is also complicated. Therefore, it is necessary to carry out seismic analysis of the cable-stayed bridge. The earthquake has obvious randomness. The seismic analysis of the cable-stayed bridge by random vibration is obviously reasonable. The software ANSYS, taking the Eastern Hubei bridge as the engineering background, uses the random vibration analysis method to calculate and analyze the seismic response of the mixed girder cable-stayed bridge under the uniform and non uniform excitation, and discusses the mechanism of the structural seismic response through the power spectrum of the structural seismic response. The results show that the bridge direction response of the structure is better under the longitudinal uniform excitation. The response of the other two directions is very small; the response characteristic of the lateral uniform excitation structure is similar to that of the longitudinal uniform excitation, only the transverse response of the bridge is larger; the vertical response and the lateral response of the structure are larger except the vertical response. The seismic response of the structure under the three dimension uniform excitation is more than one dimension one. The results show that the seismic response of the structure is decreased after considering the traveling wave effect, and it is beneficial to the seismic design, and the response of the structural response to the partially coherent effect is compared to the response without consideration of the coherent effect. The response of the structure to the local site effect is very small, and the response of the local site effect structure is very small. It shows that the effect of the seismic response of the local site effect structure is not obvious. The response of the mixed beam cable-stayed bridge is always larger than that of the concrete beam. The response of the middle span steel beam is small, and the response of small displacement in the middle span steel beam is large. At the same time, through the analysis of the structural response power spectrum, the control mode of the response of the structures under various working conditions is determined and the seismic response mechanism of the structure is clarified.

【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55;U448.27

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