【摘要】：鋼筋混凝土橋墩在地震荷載作用下極易發(fā)生破壞,作為橋梁重要承重構(gòu)件,橋墩的安全與穩(wěn)定關(guān)乎整個(gè)橋梁結(jié)構(gòu)的安全正常使用。若結(jié)構(gòu)主要承重構(gòu)件破損嚴(yán)重且難以修復(fù),即使結(jié)構(gòu)還未倒塌,仍需拆除結(jié)構(gòu)重建,從抗震防災(zāi)的方面考慮,鋼筋混凝土橋墩應(yīng)具有足夠的承載力和較好的延性,保證結(jié)構(gòu)安全并較好的消耗地震輸入能量,避免在地震作用下發(fā)生破壞。橋墩延性影響因素眾多,本文主要就配筋率對(duì)鋼筋混凝土橋墩延性抗震性能影響進(jìn)行相關(guān)數(shù)值模擬分析研究,主要內(nèi)容及結(jié)論如下:(1)介紹了歷史中橋墩破壞典型案例與橋墩抗震性能研究的發(fā)展概況,概述了延性抗震性能分析的主要方法與內(nèi)容。根據(jù)美國(guó)太平洋地震研究中心鋼筋混凝土柱抗震性能試驗(yàn)數(shù)據(jù)庫(kù)(PEER-Structural Performance Database)低周反復(fù)荷載作用下鋼筋混凝土柱的試驗(yàn)資料,分析了縱筋配筋率對(duì)鋼筋混凝土柱延性性能的影響規(guī)律。(2)基于實(shí)際工程項(xiàng)目,設(shè)置縱筋率模擬參數(shù),利用ABAQUS有限元分析軟件進(jìn)行低周反復(fù)模擬研究分析,通過改變縱筋配筋率后試件延性變化可知,位移延性系數(shù)隨著配筋率的增加而減小,耗能能力也隨之降低,而剛度呈增大趨勢(shì),根據(jù)本文分析確定試件性能較優(yōu)配筋率范圍為0.82%~3.28%。(3)通過分析不同縱筋率與配箍率相互作用下對(duì)圓柱式橋墩的延性影響可知,增大縱筋率將提高圓柱式橋墩的承載力,且配箍率越大,該提升效果越明顯。縱筋布置形式對(duì)試件承載力、延性以及耗能影響效果不明顯,但考慮施工便利應(yīng)合理選用鋼筋形式。
[Abstract]:Reinforced concrete pier is easy to be destroyed under earthquake load. As an important bearing member of bridge, the safety and stability of pier is related to the safe and normal use of the whole bridge structure. If the main bearing member of the structure is seriously damaged and difficult to repair, even if the structure has not collapsed, it is still necessary to remove and rebuild the structure. From the aspect of earthquake resistance and disaster prevention, the reinforced concrete pier should have sufficient bearing capacity and better ductility. To ensure the safety of the structure and good energy consumption earthquake input, to avoid damage under the earthquake. There are many factors affecting the ductility of bridge pier. This paper mainly studies the effect of reinforcement ratio on seismic behavior of reinforced concrete pier. The main contents and conclusions are as follows: (1) the typical cases of pier failure in history and the development of pier seismic performance research are introduced, and the main methods and contents of ductile seismic performance analysis are summarized. According to the experimental data of reinforced concrete columns under low cyclic loading (PEER-Structural Performance Database), the seismic behavior test database of reinforced concrete columns of Pacific Seismic Research Center of the United States of America is presented. The influence of reinforcement ratio of longitudinal reinforcement on ductility of reinforced concrete columns is analyzed. (2) based on the actual project, the simulation parameters of longitudinal reinforcement ratio are set up, and the low cycle repeated simulation analysis is carried out by using ABAQUS finite element analysis software. By changing the reinforcement ratio of longitudinal reinforcement, the ductility of the specimen can be seen that the displacement ductility coefficient decreases with the reinforcement ratio increasing, and the energy dissipation capacity decreases with the increase of reinforcement ratio, while the stiffness increases. According to the analysis in this paper, it is determined that the optimum reinforcement ratio of the specimen is 0.82and 3.28. (3) by analyzing the effect of the interaction of different longitudinal reinforcement ratio and hoop ratio on the ductility of cylindrical piers, Increasing the longitudinal reinforcement ratio will increase the bearing capacity of the cylindrical bridge pier, and the higher the hoop ratio is, the more obvious the lifting effect is. The effect of longitudinal reinforcement arrangement on the bearing capacity, ductility and energy consumption of the specimen is not obvious, but the form of steel bar should be selected reasonably considering the convenience of construction.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U442.55

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本文編號(hào)：2391027