本文關鍵詞：疊合柱高墩大跨連續(xù)剛構橋概率地震易損性及風險分析　出處：《西南交通大學》2015年博士論文　論文類型：學位論文

  更多相關文章： 疊合柱 高墩連續(xù)剛構橋 概率地震易損性 概率地震風險 概率抗震能力 概率地震需求

【摘要】：連續(xù)剛構橋因其跨越能力大、地形適應性強、造價適中等優(yōu)勢,成為西部山區(qū)跨越峽谷地形的主要橋型。由于受地形限制,連續(xù)剛構的橋墩越來越高,不斷刷新原有記錄,而由于鋼筋混凝土自重大、延性差的缺點,已經(jīng)成為橋墩向更高發(fā)展的瓶頸。采用鋼管混凝土疊合柱作為大跨徑連續(xù)剛構橋的橋墩,是突破這一瓶頸的一個新的嘗試。由于疊合柱材料的本構模型、力學性能和破壞方式等均與鋼筋混凝土有較大差異,對其抗震性能和損傷評估缺乏系統(tǒng)的研究。因此,深入系統(tǒng)地研究鋼管混凝土疊合柱高墩大跨徑連續(xù)剛構橋的抗震性能和損傷規(guī)律,對這一橋梁新型結構的設計和推廣應用,均具有重要的意義。本文采用數(shù)值模擬和概率解析方法,對疊合柱高墩大跨徑連續(xù)剛構橋的概率地震易損性分析和概率地震風險分析進行研究,主要研究內(nèi)容如下：(1)應用纖維模型對50個相同尺寸不同強度的疊合柱截面樣本進行偏心受壓破壞的全過程數(shù)值模擬,獲得截面的P-M-φ曲線。根據(jù)樣本數(shù)值模擬的破壞狀態(tài),將疊合柱截面劃分為彈性和非彈性、需要修復和不需要修復、可修復和不可修復、倒塌和不倒塌四個性能目標和無損傷、輕微損傷、中等損傷、嚴重損傷、完全損傷五個損傷狀態(tài)。根據(jù)截面不同纖維材料破壞應變在P-M-φ曲線上的映射,考慮偏心受壓狀態(tài)軸力的變化,不考慮纖維材料參數(shù)的不確定性,建立了以軸力為變量的疊合柱截面確定性抗震能力模型。同時,考慮纖維材料參數(shù)的不確定性,根據(jù)50個抽樣樣本偏心受壓數(shù)值模擬結果,分析不同損傷狀態(tài)曲率指標的統(tǒng)計分布規(guī)律,建立以軸力為變量的疊合柱概率抗震能力模型。(2)以一座跨徑為105m+200m+200m+105m疊合柱高墩連續(xù)剛構橋為例,選擇17條符合場地特征的實際地震波,以PGA為地震動參數(shù),考慮P-A效應,分別輸入每條地震波進行動力彈塑性時程分析和其中的一條地震波進行IDA分析,獲得縱、橫向地震作用下地震需求沿墩高的分布規(guī)律,確定橋墩的最不利截面作為地震需求分析的控制截面�？紤]橋墩截面材料參數(shù)和地震動的不確定性,分別輸入17條實際地震波進行IDA計算,對計算結果進行統(tǒng)計分析,建立疊合柱橋墩控制截面以PGA為變量的概率地震需求模型。(3)應用可靠度理論,分別推導考慮結構和地震動不確定性以及只考慮地震動不確定性的地震易損性函數(shù)解析表達式。根據(jù)概率抗震能力和概率抗震需求的參數(shù)統(tǒng)計值,獲得縱、橫向地震輸入下疊合柱高墩控制截面的地震易損性曲線,分析了墩柱發(fā)生不同損傷的規(guī)律以及結構不確定性對易損性曲線的影響。根據(jù)橋墩控制截面的易損性曲線,用一階界限法估算了疊合柱高墩大跨徑連續(xù)剛構橋結構體系發(fā)生不同損傷的超越概率,獲得橋梁結構體系的易損性曲線。(4)根據(jù)地震動參數(shù)概率模型,研究了我國現(xiàn)有不同地震基本烈度地區(qū)的地震危險性,并根據(jù)概率地震易損性分析結果和概率風險函數(shù)解析表達式,對疊合柱高墩連續(xù)剛構橋的概率地震損傷風險和概率地震需求風險進行分析,并對兩種風險概率進行對比。根據(jù)年地震風險分析的結果,獲得設計基準期內(nèi)疊合柱橋墩的地震風險概率和結構體系的地震風險概率,并根據(jù)我國現(xiàn)行公路橋梁抗震設防標準,對疊合柱高墩大跨徑連續(xù)剛構橋的抗震性能進行評估。
[Abstract]:Because of the continuous rigid frame bridge with large span capacity, strong adaptability of terrain, moderate cost and other advantages, become the main bridge across the western mountain canyon terrain. Due to the limitation of terrain, and pier continuous rigid frame is high, constantly refresh the original records, and because the weight of reinforced concrete, ductility is poor, has become a bottleneck of pier high development. The concrete filled steel tubular columns as long-span continuous rigid frame bridge is a new attempt to break the bottleneck. The constitutive model of laminated column material, mechanical properties and failure modes were compared with reinforced concrete, the lack of systematic research on the seismic performance and damage the evaluation. Therefore, the seismic performance and damage of the deep and systematic research on concrete filled steel tubular columns of high pier and long-span continuous rigid frame bridge, wide application of the design of this bridge and push the new structure, are Is of great significance. Based on the numerical simulation and probability analytical method of probability analysis of seismic fragility analysis and seismic risk probability of laminated column of high pier and long-span continuous rigid frame bridge, the main research contents are as follows: (1) application of fiber model the same size with different strength of laminated column cross-section sample of 50 numerical simulation of the whole process of eccentric compression failure, P-M- diameter curve section. According to the numerical simulation of the damage state of the sample, the column section is divided into elastic and non elastic, does not need to need to repair and repair, repair and repair, do not collapse and the collapse of four performance targets and no damage, minor damage, moderate damage, serious damage, and five damage state completely damage. According to the failure strain in the P-M- mapping on the curve sections of different fiber materials, changes into the state of eccentric compression axial force, without considering the fiber The material parameter uncertainty is established based on the axial force of the variable cross-section laminated column seismic capacity of the deterministic model. At the same time, considering the uncertainty of parameters of fiber materials, numerical simulation results based on a sample of 50 eccentric compression, analysis of statistical distribution of curvature index with different damage conditions, to establish the axial force of variable superimposed column probabilistic seismic capacity model. (2) with a span of 105m+200m+200m+105m columns high pier continuous rigid frame bridge as an example, choose 17 to meet with the site characteristics of the actual seismic wave, PGA seismic parameters, considering the P-A effect, respectively, each input seismic wave dynamic elastic-plastic time history analysis of a seismic wave and the IDA analysis, obtain the longitudinal, transverse earthquake under the seismic demand distribution along the height of the pier, the control section as the seismic demand analysis to determine the most dangerous section of the bridge pier. Considering the pier section material The material parameters and the uncertainties of the earthquake input, respectively 17 actual seismic wave IDA calculation, the results of the statistical analysis, the establishment of laminated column pier section with PGA as the probabilistic seismic demand model variables. (3) the application of reliability theory are derived considering structure and seismic uncertainties and only considering the uncertainty of seismic vulnerability analytic expression. According to the statistical parameters of probabilistic seismic capacity and probability seismic demand value, obtain the longitudinal, transverse seismic input superimposed seismic fragility curve of high pier column control section, analysis of the influence of different damage patterns and pier structure uncertainty on the vulnerability curve according to the fragility curves of pier control section, in order to estimate the probability limit method different damage structure of laminated column of high pier and long-span continuous rigid frame bridge, the bridge Fragility curves of beam structure system. (4) according to the motion parameters of the probabilistic model, studied the seismic risk of the existing basic intensity of different seismic regions in China, and according to the probability of seismic vulnerability analysis and risk probability function analytical expressions of laminated column of high pier continuous rigid frame bridge seismic damage probability and probability of earthquake risk demand risk analysis, and compares the two kinds of risk probability. According to the earthquake risk analysis results, the seismic risk probability of the design reference period of laminated column pier seismic risk probability and structure system, and according to the current highway bridge in China seismic fortification level, seismic performance of laminated column with high pier and large span continuous rigid frame bridge is evaluated.

【學位授予單位】：西南交通大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：U442.55

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本文編號：1408611