本文關鍵詞： 曲線梁橋 鉸接構造 框架式 地震反應 Pushover分析 非線性時程分析 轉(zhuǎn)動慣量　出處：《東北林業(yè)大學》2014年博士論文　論文類型：學位論文

【摘要】：橋梁是公路的重要組成部分,一旦遭受地震破壞,不僅經(jīng)濟損失巨大,后期修復困難,更會造成交通癱瘓,救災物資運輸緩慢,導致災區(qū)的傷員無法得到及時救治,間接損失無法估量。隨著人類科技的飛速發(fā)展,大跨徑、高橋墩、復雜結(jié)構形式的橋梁不斷被建設應用,在地震作用下這些復雜形式橋梁的動力反應及非線性行為已經(jīng)成為學術界和工程界探討的重點。 鉸接構造框架式曲線梁橋在美國的高速公路建設中被廣泛使用,由于這一橋型往往具有高橋墩、大跨徑,并包含框架結(jié)構、鉸接構造的結(jié)構特點,其動力性能十分復雜,在近幾次的大地震中,其遭受的破壞十分嚴重。因此,對這一橋型的地震反應進行深入研究并明確非線性損傷過程具有重要的學術價值和巨大的工程需求背景。本文結(jié)合加利福尼亞州的Yuba曲線橋及橋址附近的三維Northridge地震波針對鉸接構造框架式曲線梁橋進行動力分析,深入研究這一橋型的地震反應和非線性損傷過程。主要的研究內(nèi)容及創(chuàng)新成果如下： 1、系統(tǒng)地歸納了鉸接構造框架式曲線梁橋的非線性動力模型的建立方法和過程。介紹了混凝土、鋼筋的材料本構模型；總結(jié)了橋臺土壤彈簧、橋臺剪力鍵、橋梁內(nèi)部彈性支撐墊的非線性模型的模擬理論和方法；對比了橋梁碰撞的非線性模型,并使用考慮了滯回阻尼的赫茲模型模擬橋梁的碰撞單元；創(chuàng)新性地提出了鉸接構造的細部模擬方法。 2、研究鉸接跨的非線性損傷過程及鉸接點兩側(cè)縱向間距對鉸接跨損傷過程的影響。采用細分模型和簡化模型分別對鉸接梁跨進行局部模擬,通過對比模型數(shù)據(jù)研究兩種模型的準確程度和適用范圍；通過Pushover分析研究鉸接構造內(nèi)部的彈性橡膠支座、縱向限位鋼束、橫向受壓彈性支撐墊、橫縱向碰撞單元及鉸接跨根部梁段的非線性過程及損傷次序；在細分模型中改變鉸接點兩側(cè)梁段的縱向間距,通過Pushover分析獲得縱向間距及縱向碰撞對鉸接構造內(nèi)各限位裝置及梁跨根部梁段的非線性過程的影響。 3、研究轉(zhuǎn)動慣量對曲線橋動力特性的影響,確定曲線橋建模的最優(yōu)質(zhì)量布置形式。總結(jié)曲線橋建模的四種常用質(zhì)量布置形式;對四種質(zhì)量布置下Yuba曲線橋模型進行特征值分析,對比模型的自振周期、基本振型和高階振型,研究轉(zhuǎn)動慣量的輸入對曲線橋自振狀態(tài)的影響；選用2.0倍的Northridge地震波對四種質(zhì)量布置下的Yuba曲線橋模型進行非線性時程分析,通過分析結(jié)果研究轉(zhuǎn)動慣量的輸入對曲線梁橋的主梁位移、橋墩彎矩曲率及橋墩扭矩的影響；并最終確定曲線橋動力模型的最優(yōu)質(zhì)量布置形式。 4、鉸接構造框架式曲線梁橋的三維地震反應的研究。通過對比三維地震荷載和二維地震荷載作用下Yuba曲線橋的主梁位移和橋墩彎矩曲率獲得豎向地震波對橋梁地震反應的影響；在三維地震荷載下,對Yuba曲線橋進行非線性時程分析,獲得主梁、橋墩、橋臺、鉸接構造及各限位裝置和碰撞單元的地震反應,確定框架式曲線梁橋的易損傷位置；通過改變橋墩墩高設置,獲得橋墩對稱設置及墩高減小設置對橋梁地震反應的影響。
[Abstract]:The bridge is an important part of the highway , and once it is damaged by the earthquake , not only the economic loss is huge , the later repair is difficult , it can cause traffic paralysis , the transportation of the disaster relief material is slow , the wounded in the disaster area can not be treated in time , and the indirect loss can not be measured . With the rapid development of human science and technology , the dynamic response and nonlinear behavior of these complex forms of bridges have become the focus of discussion in academic circles and engineering circles . This paper studies the seismic response of the bridge type and the process of nonlinear damage . The main research contents and the innovative results are as follows : 1 . The method and the process of establishing the nonlinear dynamic model of the articulated structure frame type curved beam bridge are systematically summarized . The constitutive model of concrete and steel bar is introduced . The nonlinear model of bridge soil spring , bridge deck shear key and bridge inner elastic support cushion is summarized . The nonlinear model of bridge collision is compared , and the collision unit of bridge is simulated using the Hertz model considering the hysteretic damping . 2 . To study the influence of the nonlinear damage process of articulated span and the longitudinal spacing between two sides of articulation point on the process of articulation span damage . The nonlinear process and damage order of two models are studied by using subdivision model and simplified model . 3 . To study the influence of moment of inertia on the dynamic characteristics of curved bridge , and to determine the most high quality layout form of curve bridge modeling , and to analyze the characteristic value of Yuba curve bridge model under four quality arrangements , and to study the influence of the input of inertia of inertia on the self - vibration state of curve bridge . 4 . The study of the three - dimensional seismic response of the frame - type curved beam bridge with articulated structure . By comparing the three - dimensional seismic load and the two - dimensional seismic load , the influence of vertical seismic waves on the seismic response of the bridge is obtained . Under the three - dimensional seismic load , the nonlinear time history analysis of the Yuba curve bridge is carried out to obtain the seismic response of the main beam , the bridge pier , the abutment , the hinge structure and the limit device and the collision unit , and the easy damage position of the frame - type curved beam bridge is obtained .

【學位授予單位】：東北林業(yè)大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：U442.55

【參考文獻】

相關期刊論文 前10條

1 李鴻晶,孫廣俊;結(jié)構平穩(wěn)隨機地震反應時域分析:方法[J];地震工程與工程振動;2005年04期

2 張守斌;聶昊;;增量動力分析方法及其在性能評估中的應用[J];工程建設與設計;2007年06期

3 李黎;吳t，

本文編號：1530332