本文關(guān)鍵詞：高墩大跨連續(xù)剛構(gòu)橋下部結(jié)構(gòu)抗震性能研究　出處：《廣東工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高墩大跨 連續(xù)剛構(gòu)橋 樁-土效應(yīng) 墩身抗震 塑性鉸

【摘要】：隨著橋梁預(yù)應(yīng)力技術(shù)以及大跨懸臂施工方法的發(fā)展,逐漸衍生出了連續(xù)剛構(gòu)這一橋梁基本體系,連續(xù)剛構(gòu)橋由于自身整體穩(wěn)定性好、利于結(jié)構(gòu)抗震成為近幾年來跨河流、峽谷和跨線首選的橋梁結(jié)構(gòu)之一。特別是自我國西部大開發(fā)以來,對高墩大跨連續(xù)剛構(gòu)橋梁的需求量越來越大,應(yīng)用范圍越來越廣。隨著連續(xù)剛構(gòu)橋跨度與墩高不斷地加大、加高,橋梁結(jié)構(gòu)的受力也更為復(fù)雜,暴露出的震害問題也越來越多。曾經(jīng)發(fā)生在我國西部的四川汶川地震和青海玉樹地震都給我們留下了深刻的教訓(xùn)和啟示,迫使我們必須在橋梁抗震設(shè)計(jì)方面有更高水平的理論研究和切合實(shí)際、可行有效的防震措施。 連續(xù)剛構(gòu)橋是一種墩梁固結(jié)體系,在歷次震害中表明單獨(dú)的梁體破壞很少,落梁情況幾乎沒有,梁體的破壞均是由于墩柱與基礎(chǔ)的破壞所致,因而對高墩大跨連續(xù)剛構(gòu)橋墩身抗震性能研究勢在必得。本文在高墩大跨連續(xù)剛構(gòu)橋下部結(jié)構(gòu)抗震性能研究方面主要做了以下工作： (1)根據(jù)地殼的構(gòu)成及板塊運(yùn)動(dòng)理論,剖析地震發(fā)生的成因,明確地震度量的方式及地震動(dòng)特征的描述方式；掌握幾組常見地震波加速度曲線的特征,研究其在反應(yīng)譜分析和時(shí)程分析中的適用條件和輸入方法。 (2)分析單樁分別在考慮樁-土效應(yīng)與不考慮樁-土效應(yīng)條件下的地震動(dòng)響應(yīng)情況。研究群樁中單樁之間的相互作用效應(yīng)與S/d(樁間距／樁徑)之間的關(guān)系；分析群樁動(dòng)力阻抗(水平動(dòng)力阻抗與豎向動(dòng)力阻抗)與無量綱激振頻率的相關(guān)性,以及群樁的動(dòng)力阻抗與單樁動(dòng)力阻抗之和的大小關(guān)系。 (3)分析空心墩連續(xù)剛構(gòu)橋與實(shí)心墩連續(xù)剛構(gòu)橋的結(jié)構(gòu)動(dòng)力特性,比較兩者在地震動(dòng)作用下的響應(yīng)情況和內(nèi)力分布規(guī)律,進(jìn)而選擇適當(dāng)?shù)臉蚨战孛骖愋秃蛯蚨战孛鎱?shù)進(jìn)行可行性優(yōu)化。 (4)通過對鋼筋混凝土橋墩抗震變形能力的研究,明確塑性鉸在反復(fù)地震作用下形成的原因和在抗震過程中所發(fā)揮的作用；通過總結(jié)借鑒前人的研究成果,給出等效塑性鉸長度、配置箍筋用量和塑性鉸區(qū)抗剪強(qiáng)度的計(jì)算公式。 本文的創(chuàng)新之處在于：①連續(xù)剛構(gòu)橋墩身截面分別采用空心矩形截面與實(shí)心矩形截面,將這兩種不同墩身截面的橋梁結(jié)構(gòu)進(jìn)行動(dòng)力特性分析和地震響應(yīng)分析,確定墩身的最佳截面類型。另外,根據(jù)墩身內(nèi)力分布規(guī)律,對墩身截面尺寸進(jìn)行優(yōu)化。②探索性的研究鋼筋混凝土橋墩變形能力,分析塑性鉸對橋墩抗震特性的影響,給出了在塑性鉸區(qū)配箍的要求和計(jì)算方法。 本研究為高墩大跨連續(xù)剛構(gòu)橋墩身抗震設(shè)計(jì)提供了有效的計(jì)算思路和分析方法,其研究成果可為連續(xù)剛構(gòu)橋墩身抗震設(shè)計(jì)和地震響應(yīng)分析提供參考。
[Abstract]:With the development of bridge prestressing technology and long-span cantilever construction method, the continuous rigid frame is gradually derived as the bridge basic system. The continuous rigid frame bridge has good overall stability. Aseismic structure has become one of the preferred bridge structures across rivers, canyons and lines in recent years. Especially since the development of western China, the demand for long-span continuous rigid frame bridges with high piers is increasing. With the continuous rigid frame bridge span and pier height increasing, the force of bridge structure is more complex. The Wenchuan earthquake in the west of China and the Yushu earthquake in Qinghai province have left us with profound lessons and enlightenment. It is necessary for us to have a higher level of theoretical research and practical, feasible and effective earthquake prevention measures in seismic design of bridges. Continuous rigid frame bridge is a kind of consolidation system of piers and beams, which shows that the damage of single beam is very few, and the condition of falling beam is almost no. The damage of beam is caused by the damage of pier column and foundation. Therefore, the research potential of seismic behavior of pier body of long-span continuous rigid frame bridge with high piers is obtained. The main work of this paper is to study the seismic behavior of the substructure of continuous rigid frame bridge with high pier and long span. 1) according to the theory of crustal composition and plate movement, the causes of earthquake occurrence are analyzed, and the way of earthquake measurement and the description of seismic characteristics are defined. The characteristics of several common seismic wave acceleration curves are grasped and the applicable conditions and input methods in response spectrum analysis and time history analysis are studied. The seismic response of single pile under the condition of considering pile-soil effect and not considering pile-soil effect respectively is analyzed. The interaction effect of single pile in pile group and S / D (spacing / diameter of pile) are studied. The relationship between; The correlation between the dynamic impedance of pile group (horizontal dynamic impedance and vertical dynamic impedance) and the dimensionless excitation frequency, and the relationship between the dynamic impedance of pile group and the sum of the dynamic impedance of single pile are analyzed. 3) the structural dynamic characteristics of hollow pier continuous rigid frame bridge and solid pier continuous rigid frame bridge are analyzed, and the response and internal force distribution of the two bridges under ground motion are compared. Then the appropriate type of pier section and the feasibility optimization of the parameters of pier section are selected. (4) through the study of seismic deformation capacity of reinforced concrete pier, the causes of plastic hinge forming under repeated earthquake and the function of plastic hinge in seismic process are clarified. By summing up the previous research results, the formulas for calculating the equivalent plastic hinge length, the amount of stirrups and the shear strength in the plastic hinge region are given. The innovation of this paper lies in the use of hollow rectangular section and solid rectangular section respectively in the pier section of the continuous rigid frame bridge of 1: 1. The dynamic characteristics and seismic response of these two kinds of bridge structures with different pier sections are analyzed. In addition, according to the law of internal force distribution of pier body, the section size of pier is optimized by .2 exploratory research on the deformation capacity of reinforced concrete pier. The influence of plastic hinge on seismic behavior of bridge pier is analyzed, and the requirement and calculation method of hoop distribution in plastic hinge region are given. This study provides an effective calculation and analysis method for the seismic design of the pier of a long-span continuous rigid frame bridge with high piers. The research results can be used as a reference for seismic design and seismic response analysis of the pier of a continuous rigid frame bridge.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U442.55;U448.23

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李少方;;高速公路剛構(gòu)特大橋施工技術(shù)研究[J];黑龍江交通科技;2015年01期

相關(guān)碩士學(xué)位論文 前2條

1 吳楷;橋梁基礎(chǔ)抗震簡化模擬方法適用性研究[D];廣州大學(xué);2016年

2 劉遮;連續(xù)剛構(gòu)橋梁的動(dòng)力優(yōu)化研究[D];昆明理工大學(xué);2015年

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本文編號：1440602