大跨度鋼管樁橋梁地震反應(yīng)分析
發(fā)布時(shí)間：2018-07-15 17:36
【摘要】：隨著社會(huì)經(jīng)濟(jì)的發(fā)展,我國各類橋梁數(shù)量激增。然而,我國所處的地理位置決定了我國地震災(zāi)情頻繁且嚴(yán)重,近年來多次破壞性地震給災(zāi)區(qū)造成了極大的人員傷亡和經(jīng)濟(jì)損失,因此對(duì)各類橋梁的抗震性能及加固方法進(jìn)行深入研究,將對(duì)橋梁安全性的提高大有裨益�；谏鲜霰尘�,本文主要做了以下工作:介紹了橋梁結(jié)構(gòu)地震反應(yīng)分析的相關(guān)理論和分析方法,以及樁周地基土等效彈簧剛度的求解理論、樁體的非線性、樁-土相互作用彈簧的非線性等。介紹了建立有限元模型及求解相關(guān)參數(shù)的方法,得到加載實(shí)測(cè)地震波后各鋼管樁彎矩、曲率的地震反應(yīng)值及分布規(guī)律。根據(jù)大橋的模態(tài)圖及樁的彎矩、曲率校核情況,對(duì)支座類型和樁長、樁徑及壁厚等進(jìn)行調(diào)整,得到了較為合理的抗震設(shè)計(jì)方案。通過分析,可得以下結(jié)論:對(duì)于完全埋置于土中的樁來說,其在側(cè)向地震力作用下的彎矩最大值出現(xiàn)在樁頂位置,在設(shè)計(jì)和施工時(shí)要保證樁頂與承臺(tái)之間連接的可靠性;對(duì)于半埋于土中的樁來說,其彎矩最大值出現(xiàn)在樁的中部,靠近空氣與土、水與土的交界面,在設(shè)計(jì)和施工時(shí)要注意交界面處樁的防腐蝕、防沖擊等問題,避免對(duì)該處的承載力造成削弱。調(diào)整樁的尺寸條件時(shí),要綜合考慮抗震性能和豎向承載力等因素,避免影響其正常使用狀態(tài)的承載能力。樁的強(qiáng)度、剛度都較高時(shí),可保證其在地震作用下不被破壞,但易造成材料的浪費(fèi),且不能發(fā)揮鋼材塑性變形耗能的性質(zhì),因此若有過多的樁在地震作用下未進(jìn)入塑性狀態(tài),應(yīng)考慮適當(dāng)降低樁的強(qiáng)度和剛度。對(duì)于同一根樁,根據(jù)受力情況在不同深度使用不同的樁壁厚度是可行的,能夠保證樁在地震作用下的彎矩和曲率都不超限,且能節(jié)省鋼材的使用量。結(jié)論有利于增進(jìn)工程人員對(duì)鋼管樁地震響應(yīng)特性的了解,也能對(duì)鋼管樁橋梁的抗震設(shè)計(jì)及震后加固起到一定的指導(dǎo)作用。
[Abstract]:With the development of social economy, the number of all kinds of bridges in our country is increasing rapidly. However, the geographical location of our country determines the frequent and serious earthquake disaster situation in our country. In recent years, many destructive earthquakes have caused great casualties and economic losses to the disaster areas. Therefore, it will be helpful to improve the safety of bridges by studying the seismic performance and strengthening methods of all kinds of bridges. Based on the above background, the main work of this paper is as follows: the related theory and analysis method of seismic response analysis of bridge structure, the solution theory of equivalent spring stiffness of soil around pile, the nonlinearity of pile body are introduced. The nonlinearity of pile-soil interaction spring. The finite element model and the method of solving the related parameters are introduced. The seismic response value and distribution law of the bending moment and curvature of each steel pipe pile after loading the seismic wave are obtained. According to the modal diagram of the bridge and the moment and curvature of the pile, the support type, pile length, pile diameter and wall thickness are adjusted, and a more reasonable seismic design scheme is obtained. Through analysis, the following conclusions can be drawn: for the pile completely buried in soil, the maximum bending moment under lateral seismic force appears at the top of the pile, and the reliability of the connection between the pile top and the cap should be guaranteed in the design and construction; For the partially buried pile, the maximum bending moment appears in the middle of the pile, close to the interface between air and soil, water and soil. In the design and construction, attention should be paid to the anti-corrosion and anti-impact problems of the pile at the interface. Avoid weakening the bearing capacity. When adjusting the size condition of pile, the seismic performance and vertical bearing capacity should be considered comprehensively to avoid affecting the bearing capacity of the pile in its normal service state. When the strength and stiffness of pile are high, it can be guaranteed not to be destroyed under earthquake, but it is easy to cause waste of materials, and it can not exert the properties of energy dissipation of steel plastic deformation, so if there are too many piles not in plastic state under earthquake action, Consideration should be given to reducing the strength and stiffness of the pile. For the same pile, it is feasible to use different thickness of pile wall at different depth according to the stress condition, which can ensure that the bending moment and curvature of pile under seismic action are not over the limit, and can save the use of steel. Conclusion it is helpful to improve the understanding of the seismic response characteristics of steel pipe piles, and it can also play a guiding role in seismic design and post-earthquake reinforcement of steel pipe pile bridges.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55
[Abstract]:With the development of social economy, the number of all kinds of bridges in our country is increasing rapidly. However, the geographical location of our country determines the frequent and serious earthquake disaster situation in our country. In recent years, many destructive earthquakes have caused great casualties and economic losses to the disaster areas. Therefore, it will be helpful to improve the safety of bridges by studying the seismic performance and strengthening methods of all kinds of bridges. Based on the above background, the main work of this paper is as follows: the related theory and analysis method of seismic response analysis of bridge structure, the solution theory of equivalent spring stiffness of soil around pile, the nonlinearity of pile body are introduced. The nonlinearity of pile-soil interaction spring. The finite element model and the method of solving the related parameters are introduced. The seismic response value and distribution law of the bending moment and curvature of each steel pipe pile after loading the seismic wave are obtained. According to the modal diagram of the bridge and the moment and curvature of the pile, the support type, pile length, pile diameter and wall thickness are adjusted, and a more reasonable seismic design scheme is obtained. Through analysis, the following conclusions can be drawn: for the pile completely buried in soil, the maximum bending moment under lateral seismic force appears at the top of the pile, and the reliability of the connection between the pile top and the cap should be guaranteed in the design and construction; For the partially buried pile, the maximum bending moment appears in the middle of the pile, close to the interface between air and soil, water and soil. In the design and construction, attention should be paid to the anti-corrosion and anti-impact problems of the pile at the interface. Avoid weakening the bearing capacity. When adjusting the size condition of pile, the seismic performance and vertical bearing capacity should be considered comprehensively to avoid affecting the bearing capacity of the pile in its normal service state. When the strength and stiffness of pile are high, it can be guaranteed not to be destroyed under earthquake, but it is easy to cause waste of materials, and it can not exert the properties of energy dissipation of steel plastic deformation, so if there are too many piles not in plastic state under earthquake action, Consideration should be given to reducing the strength and stiffness of the pile. For the same pile, it is feasible to use different thickness of pile wall at different depth according to the stress condition, which can ensure that the bending moment and curvature of pile under seismic action are not over the limit, and can save the use of steel. Conclusion it is helpful to improve the understanding of the seismic response characteristics of steel pipe piles, and it can also play a guiding role in seismic design and post-earthquake reinforcement of steel pipe pile bridges.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55
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1 王廣軍;層狀土地震反應(yīng)分析中的輸入波[J];巖土工程學(xué)報(bào);1984年03期
2 王志良;沈智剛;李相崧;黃賓;;用計(jì)算機(jī)聯(lián)機(jī)實(shí)驗(yàn)系統(tǒng)進(jìn)行土層地震反應(yīng)分析[J];世界地震工程;1986年04期
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