近斷層豎向地震動(dòng)的特征及對(duì)連續(xù)梁橋的影響研究
發(fā)布時(shí)間：2019-04-12 12:06
【摘要】：近斷層地震豎向與水平向加速度峰值比通常是取為1/2-2/3。而近年來的研究發(fā)現(xiàn),這一比值和震級(jí)、震中距、周期等因素的關(guān)系非常密切,豎向與水平向加速度譜比值的曲線在短周期段的峰值隨斷層距的減小而增大,很多近斷層地震動(dòng)記錄的豎向與水平向加速度峰值比超過2/3。部分豎向峰值加速度竟然超過了水平向峰值加速度,因此這一比值取值明顯偏小。在鐵路橋梁的抗震設(shè)計(jì)中,小于9度地震豎向地震動(dòng)的影響一般是不考慮的,但隨著對(duì)強(qiáng)震中結(jié)構(gòu)破壞現(xiàn)象的調(diào)查和研究,以及越來越多的地震記錄顯示,特別是近斷層區(qū)域及震中區(qū)域,豎向地震動(dòng)的作用相當(dāng)顯著,造成了許多結(jié)構(gòu)的破壞。因此,研究豎向地震動(dòng)的規(guī)律特點(diǎn)及對(duì)連續(xù)梁橋的影響顯得尤為重要。論文以四座跨徑不同的鐵路連續(xù)梁橋?yàn)檠芯繉?duì)象,建立四組有限元模型,研究豎向地震動(dòng)對(duì)橋梁結(jié)構(gòu)的影響,研究內(nèi)容主要包括以下內(nèi)容：(1).通過對(duì)大量地震動(dòng)數(shù)據(jù)的處理,具體闡述了近斷層豎向地震動(dòng)加速度峰值比和PGV/PG4與震級(jí)、斷層距、斷層類型和剪切波速的關(guān)系。(2).通過有限元軟件MIDAS建立四組連續(xù)梁模型,輸入不同峰值的豎向加速度,研究豎向地震動(dòng)作用下連續(xù)梁橋上部結(jié)構(gòu)的反應(yīng)；通過輸入同等峰值的豎向加速度,研究豎向地震動(dòng)對(duì)不同跨徑連續(xù)梁橋的影響及規(guī)律。(3).研究了豎向地震動(dòng)對(duì)不同高度橋墩的影響及規(guī)律特點(diǎn),分析了不同高度橋墩在豎向地震動(dòng)作用下可能發(fā)生的破壞形式。
[Abstract]:The peak ratio of vertical to horizontal acceleration of near fault earthquakes is usually taken as 1 ~ 2 ~ 2 ~ 2 ~ 3. In recent years, it has been found that this ratio is closely related to magnitude, epicenter distance, period and other factors, and the peak value of the ratio of vertical to horizontal acceleration spectrum increases with the decrease of fault distance in the short period. The ratio of vertical to horizontal peak acceleration of many near-fault ground motion records is more than 2. 3. Part of the vertical peak acceleration actually exceeds the horizontal peak acceleration, so the value of this ratio is obviously smaller than that of the horizontal peak acceleration. In the seismic design of railway bridges, the influence of vertical ground motion of earthquake less than 9 degrees is generally not considered. However, with the investigation and research of structural failure phenomenon in strong earthquakes, and more seismic records show that, Especially in the near fault area and epicenter area, the vertical ground motion is very significant, which results in the destruction of many structures. Therefore, it is very important to study the characteristics of vertical ground motion and its influence on continuous beam bridges. In this paper, four groups of finite element models are established to study the influence of vertical seismic ground motion on the structure of four continuous railway girder bridges with different spans. The main contents of the study are as follows: (1) the main contents of this paper are as follows: (1) the main contents of this paper are as follows: (1). By processing a large number of ground motion data, the relationship between the peak acceleration ratio of vertical ground motion near fault and PGV/PG4 and magnitude, fault distance, fault type and shear wave velocity is described in detail. (2) the relationship between the acceleration peak ratio and earthquake magnitude, fault distance, fault type and shear wave velocity is discussed in detail. Four groups of continuous beam models were established by finite element software MIDAS, and the vertical acceleration with different peak values was inputted to study the response of the superstructure of continuous beam bridge under vertical ground motion. The influence of vertical seismic ground motion on continuous beam bridges with different spans is studied by inputting the vertical acceleration of the same peak value. (3). In this paper, the influence of vertical seismic ground motion on different height piers and its regularity are studied, and the possible failure forms of bridge piers with different heights under vertical ground motion are analyzed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U448.215;U442.55
本文編號(hào)：2456998
[Abstract]:The peak ratio of vertical to horizontal acceleration of near fault earthquakes is usually taken as 1 ~ 2 ~ 2 ~ 2 ~ 3. In recent years, it has been found that this ratio is closely related to magnitude, epicenter distance, period and other factors, and the peak value of the ratio of vertical to horizontal acceleration spectrum increases with the decrease of fault distance in the short period. The ratio of vertical to horizontal peak acceleration of many near-fault ground motion records is more than 2. 3. Part of the vertical peak acceleration actually exceeds the horizontal peak acceleration, so the value of this ratio is obviously smaller than that of the horizontal peak acceleration. In the seismic design of railway bridges, the influence of vertical ground motion of earthquake less than 9 degrees is generally not considered. However, with the investigation and research of structural failure phenomenon in strong earthquakes, and more seismic records show that, Especially in the near fault area and epicenter area, the vertical ground motion is very significant, which results in the destruction of many structures. Therefore, it is very important to study the characteristics of vertical ground motion and its influence on continuous beam bridges. In this paper, four groups of finite element models are established to study the influence of vertical seismic ground motion on the structure of four continuous railway girder bridges with different spans. The main contents of the study are as follows: (1) the main contents of this paper are as follows: (1) the main contents of this paper are as follows: (1). By processing a large number of ground motion data, the relationship between the peak acceleration ratio of vertical ground motion near fault and PGV/PG4 and magnitude, fault distance, fault type and shear wave velocity is described in detail. (2) the relationship between the acceleration peak ratio and earthquake magnitude, fault distance, fault type and shear wave velocity is discussed in detail. Four groups of continuous beam models were established by finite element software MIDAS, and the vertical acceleration with different peak values was inputted to study the response of the superstructure of continuous beam bridge under vertical ground motion. The influence of vertical seismic ground motion on continuous beam bridges with different spans is studied by inputting the vertical acceleration of the same peak value. (3). In this paper, the influence of vertical seismic ground motion on different height piers and its regularity are studied, and the possible failure forms of bridge piers with different heights under vertical ground motion are analyzed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U448.215;U442.55
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