本文關(guān)鍵詞：大跨度多塔斜拉橋主梁隨機地震可靠性分析　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大跨度多塔斜拉橋 隨機地震響應(yīng)分析 行波效應(yīng) 相干效應(yīng) 地震可靠性分析 結(jié)構(gòu)參數(shù)隨機性

【摘要】：建成的大跨度多塔斜拉橋在交通系統(tǒng)中具有重要的地位,其具有長大的跨越規(guī)模和復(fù)雜的結(jié)構(gòu)體系,因而對其進行科學(xué)合理的抗震設(shè)計和分析,是當(dāng)前的一個重要課題。作為抗震理論的重要組成部分,地震可靠性分析理論已經(jīng)取得了長足進步,但是對于大跨度多塔斜拉橋的隨機地震可靠性分析方面還研究較少。論文以已建成的嘉紹跨江大橋作為研究對象,考慮地震激勵和主梁結(jié)構(gòu)參數(shù)兩方面的隨機性,建立其可靠性分析方法,從而得到主梁的隨機地震可靠性指標(biāo),并進行評價分析。論文的主要內(nèi)容為：1、系統(tǒng)梳理了結(jié)構(gòu)隨機地震可靠性分析方法,包括隨機振動理論和多隨機的可靠性分析方法兩部分。前者包括地震動輸入問題、地震動空間效應(yīng)處理模型、隨機地震響應(yīng)功率譜方法,后者包括隨機地震可靠性分析原理和結(jié)構(gòu)可靠性分析理論兩部分。2、通過建立嘉紹大橋的有限元模型,并分析其動力特性,了解其振型分布特征,并進一步對嘉紹大橋的剛度特性作出判斷。選定主梁彈性模量、泊松比和質(zhì)量來分析其對橋梁動力特性的影響程度,計算結(jié)果表明三者都是橋梁動力特性的敏感因素,其中彈性模量和主梁質(zhì)量的影響更為敏感。3、采用隨機振動方法求解嘉紹大橋在隨機地震作用下的響應(yīng),比較了胡聿賢譜模型、歐進萍譜模型和杜修力譜模型下的響應(yīng)影響,一維一致激勵與三維一致激勵下響應(yīng)結(jié)果比較,以及考慮地震動的行波效應(yīng)和相干效應(yīng)對響應(yīng)結(jié)果的影響。4、基于現(xiàn)行橋梁抗震設(shè)計規(guī)范和首次超越機制建立起相應(yīng)的功能函數(shù)和極限狀態(tài),并采用響應(yīng)面方法,在不同樣本點處進行隨機振動分析以求得響應(yīng)結(jié)果,擬合出主梁結(jié)構(gòu)的功能函數(shù)顯式表達,最后用經(jīng)典的矩方法分析其可靠性。結(jié)果表明主梁在隨機地震荷載作用下,結(jié)構(gòu)參數(shù)隨機性對可靠性指標(biāo)有較大的影響；嘉紹大橋主梁在隨機地震荷載作用下,其可靠度指標(biāo)滿足規(guī)范規(guī)定的結(jié)構(gòu)目標(biāo)可靠度要求,結(jié)果說明嘉紹大橋主梁在設(shè)計地震作用下具有足夠的安全性。
[Abstract]:Long span cable-stayed bridge built has an important position in the transportation system, which has grown across scale and complicated structure system, the seismic design and Analysis on the scientific and rational, is currently an important topic. As an important part of seismic theory, theory of seismic reliability analysis has been discussed great progress, but for the analysis of stochastic seismic reliability of long span cable-stayed bridge is less studied. Paper has built the Jiashao bridge as the research object, considering the randomness of two aspects of seismic excitation and girder structure parameters, establishes the reliability analysis method, so as to obtain the random seismic reliability index of main girder, and evaluation and analysis. The main contents of this paper are as follows: 1. Systematically analyzes the reliability analysis method of random seismic structure, including the theory of random vibration and random reliability The two part analysis method. The former includes seismic input, spatial effect model, response spectrum method of random earthquake, including random seismic reliability analysis of the two part is the theoretical principle and structure of.2 reliability, by establishing a finite element model of Jiashao bridge, and analyzes its dynamic characteristics, understand the vibration distribution the characteristics, judgment and further to Jiashao bridge stiffness. The selected beam elastic modulus influences the dynamic characteristics of bridge Poisson's ratio and quality, the calculation results show that the three are the sensitive factors of dynamic characteristics of the bridge, the influence of the elastic modulus and the beam quality is more sensitive to the.3 response the random vibration method of Jiashao bridge under random excitation, the Hu spectral model model, Ou Jinping spectrum model and spectrum response Du Xiuli shadow model under a one-dimensional ring Induced and 3D under uniform excitation and traveling wave effect response results, considering seismic and coherent effects on the response of the.4, the current seismic design codes and standards and establish a mechanism for the first time beyond the function and limit state based on the corresponding, and using the response surface method for random vibration analysis in different sample points to to obtain results, fitting function of main girder structure explicit expression, finally using moment method classical reliability analysis. The results show that in the main girder under random seismic loading, the randomness of the structural parameter has great influence on reliability index; Jiashao bridge girders under random seismic loading, the reliability indexes meet the requirements the degree of structure of the target specification is reliable, the main girder of Jiashao bridge has enough safety in the design earthquake.

【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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本文編號：1421749