发电大桥高墩斜交桥抗震性能及参数影响分析
发布时间：2018-11-04 14:49
【摘要】：高墩斜交桥是山区公路上的常见桥型,但由于高墩斜交桥的上部结构是斜交和下部结构的高墩都有自身的受力特殊性,两个特殊性组合在一起其地震反应比一般的斜交桥要复杂。而现有高墩斜交桥抗震理论抗震和规范中对高墩斜交桥的抗震规定也比较空白。本文主要以发电大桥斜交桥为基础进行抗震研究,主要做了以下工作：(1)以发电大桥为工程实例,选取桥墩最高的一联,运用有限元软件Midas-civil建立发电大桥斜交桥的三维有限元模型,对发电大桥进行反应谱分析,得出在E1地震作用和E2地震作用下,发电大桥内力和支座位移满足要求。(2)对发电大桥进行时程分析,将反应谱分析中的不同地震烈度转换成不同峰值的EI波,研究在不同地震烈度EI波作用下桥梁的地震反应,得出在设计常遇和罕遇地震烈度下的El Centro波作用下,发电大桥内力和位移满足抗震要求。(3)对发电大桥进行弹塑性分析,采用Midas-civil里的弹塑性纤维模型,对发电大桥的桥墩进行抗震弹塑性分析,在抗震设计E1地震作用和E2地震作用下,发电大桥各墩底截面混凝土和钢筋满足抗震要求,都在弹性状态下,而当地震烈度为0.30g的El Centro波作用下四个桥墩墩底截面会出现不同程度的裂缝,钢筋也有部分屈服,矮墩的屈服状态更明显。(4)建立单跨斜交桥基本模型,以单一变量研究斜交桥在地震力作用下的受力与墩高、跨度、斜度参数变量的关系,从模型中提取斜交桥的墩底内力,并对数据进行绘图分析得出了随着参数变化桥梁地震内力的变化趋势。同时对单跨模型还进行了以双参数变化研究斜交桥在地震作用下受力与墩高、跨度、斜度三个参数两两组合同时变化变量的关系,得出对桥梁地震内力的敏感性参数大小排序为墩高、斜交角度、跨径。(5)建立两跨斜交桥基本模型,以单一变量研究斜交桥在地震力作用下的受力与墩高、跨度、斜度参数变量的关系,从模型中提取斜交桥的墩底内力,并对数据进行绘图分析得出了随着参数变化桥梁地震内力的变化趋势。参数分析中内力变化趋势与工程实例发电大桥高矮墩地震内力情况可得出高墩斜交桥比一般斜交桥对地震反应更敏感。
[Abstract]:The skew bridge with high piers is a common bridge type on mountain highway. However, the superstructure of the skew bridge with high piers has its own particularity of force, because the superstructure of the skew bridge with high piers and the high piers of the substructure have their own characteristics. Combined with two particularities, the seismic response is more complex than that of the general skew bridge. However, the seismic regulation of high pier skew bridge is blank in the seismic theory and code of the existing high pier skew bridge. The main work of this paper is to study the earthquake resistance of the skew bridge of power generation bridge. The main work is as follows: (1) taking the power generation bridge as an engineering example, the highest pier of the bridge is selected. The finite element software Midas-civil is used to establish the three-dimensional finite element model of the oblique bridge of power generation bridge, and the response spectrum of the bridge is analyzed. The results show that under the action of E1 earthquake and E2 earthquake, The internal force and support displacement of the power generation bridge meet the requirements. (2) the time-history analysis of the power generation bridge is carried out, and the different seismic intensity in the response spectrum analysis is converted to the EI wave with different peak values. The seismic response of the bridge under the action of EI wave with different seismic intensity is studied. It is concluded that the internal force and displacement of the power generation bridge can meet the seismic requirements under the action of the El Centro wave under the design frequency and rare earthquake intensity. (3) the elastic-plastic analysis of the power generation bridge is carried out. The elastoplastic fiber model of Midas-civil is used to analyze the aseismic elastoplastic behavior of the pier of the power generation bridge. Under the seismic design of E1 earthquake and E2 earthquake, the concrete and reinforcement at the bottom section of the pier of the power generation bridge can meet the seismic requirements. When the seismic intensity is 0.30g El Centro wave, there will be cracks in the bottom section of the four piers, and the steel bar will yield partly. The yield state of short pier is more obvious. (4) the basic model of single-span skew bridge is established, and the relationship between the stress of skew bridge under seismic force and the parameter variables of pier height, span and slope is studied with a single variable. The internal forces at the pier bottom of the skew bridge are extracted from the model, and the variation trend of the seismic internal forces along with the change of the parameters is obtained by drawing and analyzing the data. At the same time, the single span model is used to study the relationship between the stress of skew bridge under earthquake and the combination of three parameters of pier height, span and slope. It is concluded that the order of the sensitive parameters for the seismic internal force of the bridge is pier height, oblique angle, span. (5) the basic model of the two-span skew bridge is established, and the single variable is used to study the force, pier height and span of the skew bridge under the action of seismic force. Based on the relationship of slope parameter variables, the internal forces of piers bottom of skew bridge are extracted from the model, and the variation trend of seismic internal forces of the bridge with the variation of parameters is obtained by drawing and analyzing the data. The variation trend of internal force in parameter analysis and the seismic internal force of high pier and short pier of power generation bridge can be concluded that the high pier skew bridge is more sensitive to seismic response than the general skew bridge.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U442.55
本文编号：2310153
[Abstract]:The skew bridge with high piers is a common bridge type on mountain highway. However, the superstructure of the skew bridge with high piers has its own particularity of force, because the superstructure of the skew bridge with high piers and the high piers of the substructure have their own characteristics. Combined with two particularities, the seismic response is more complex than that of the general skew bridge. However, the seismic regulation of high pier skew bridge is blank in the seismic theory and code of the existing high pier skew bridge. The main work of this paper is to study the earthquake resistance of the skew bridge of power generation bridge. The main work is as follows: (1) taking the power generation bridge as an engineering example, the highest pier of the bridge is selected. The finite element software Midas-civil is used to establish the three-dimensional finite element model of the oblique bridge of power generation bridge, and the response spectrum of the bridge is analyzed. The results show that under the action of E1 earthquake and E2 earthquake, The internal force and support displacement of the power generation bridge meet the requirements. (2) the time-history analysis of the power generation bridge is carried out, and the different seismic intensity in the response spectrum analysis is converted to the EI wave with different peak values. The seismic response of the bridge under the action of EI wave with different seismic intensity is studied. It is concluded that the internal force and displacement of the power generation bridge can meet the seismic requirements under the action of the El Centro wave under the design frequency and rare earthquake intensity. (3) the elastic-plastic analysis of the power generation bridge is carried out. The elastoplastic fiber model of Midas-civil is used to analyze the aseismic elastoplastic behavior of the pier of the power generation bridge. Under the seismic design of E1 earthquake and E2 earthquake, the concrete and reinforcement at the bottom section of the pier of the power generation bridge can meet the seismic requirements. When the seismic intensity is 0.30g El Centro wave, there will be cracks in the bottom section of the four piers, and the steel bar will yield partly. The yield state of short pier is more obvious. (4) the basic model of single-span skew bridge is established, and the relationship between the stress of skew bridge under seismic force and the parameter variables of pier height, span and slope is studied with a single variable. The internal forces at the pier bottom of the skew bridge are extracted from the model, and the variation trend of the seismic internal forces along with the change of the parameters is obtained by drawing and analyzing the data. At the same time, the single span model is used to study the relationship between the stress of skew bridge under earthquake and the combination of three parameters of pier height, span and slope. It is concluded that the order of the sensitive parameters for the seismic internal force of the bridge is pier height, oblique angle, span. (5) the basic model of the two-span skew bridge is established, and the single variable is used to study the force, pier height and span of the skew bridge under the action of seismic force. Based on the relationship of slope parameter variables, the internal forces of piers bottom of skew bridge are extracted from the model, and the variation trend of seismic internal forces of the bridge with the variation of parameters is obtained by drawing and analyzing the data. The variation trend of internal force in parameter analysis and the seismic internal force of high pier and short pier of power generation bridge can be concluded that the high pier skew bridge is more sensitive to seismic response than the general skew bridge.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U442.55
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