爆炸荷載作用下鋼管混凝土柱的動力響應(yīng)及損傷評估
發(fā)布時間：2018-12-14 07:31
【摘要】：隨著恐怖襲擊目標的轉(zhuǎn)變和天然氣爆炸事故的增多,在進行民用建筑設(shè)計時,適當考慮爆炸荷載非常必要。采用抗爆性能優(yōu)越的材料和結(jié)構(gòu)體系是最有效、最經(jīng)濟的抗爆設(shè)計途徑,因此,本文將受力合理、塑性好、耐火性能優(yōu)越的鋼管混凝土柱作為研究對象,主要從爆炸沖擊波的產(chǎn)生與傳播、材料的動態(tài)力學(xué)性能、鋼管混凝土柱在爆炸荷載作用下的動力響應(yīng)和損傷評估等幾個方面,系統(tǒng)地研究了鋼管混凝土柱的抗爆性能,主要的研究內(nèi)容和成果如下:(1)采用數(shù)值分析的方法模擬了爆炸沖擊波產(chǎn)生與傳播的整個過程,得到了網(wǎng)格尺寸對爆炸沖擊波超壓峰值的影響規(guī)律,驗證了爆炸相似律的適用性,并分析了剛性地面對爆炸沖擊波傳播的影響。研究結(jié)果為爆炸沖擊波的準確模擬提供了一定的依據(jù):爆炸超壓峰值對網(wǎng)格尺寸的敏感度隨著比例距離的增大而減小;當縮尺比例較小時,在比例距離較小的情況下,爆炸相似定律的誤差較大;爆炸沖擊波超壓峰值會因剛性地面的反射作用而顯著增大,但這種增強效應(yīng)會隨著起爆高度的增大而減弱,當起爆高度增大到一定數(shù)值時,這種增強效應(yīng)就可以被忽略。(2)采用分離式霍普金森壓桿(SHPB)試驗的數(shù)值模型分別研究了單軸應(yīng)力狀態(tài)下混凝土、鋼材、鋼管混凝土的動態(tài)力學(xué)性能和被動圍壓下混凝土的動態(tài)力學(xué)性能,并分析了HJC模型參數(shù)的敏感性。研究結(jié)果可為爆炸荷載作用下鋼管混凝土柱數(shù)值模型的建立提供一定依據(jù):混凝土、鋼材和鋼管混凝土都是應(yīng)變率敏感材料,材料強度隨著應(yīng)變率的增大都有一定程度的提高;HJC模型適用于模擬各種受力狀態(tài)下混凝土的動態(tài)力學(xué)性能;可根據(jù)HJC模型參數(shù)的敏感性來修正數(shù)值模型;鋼管與混凝土之間的粘結(jié)滑移對鋼管混凝土的動態(tài)力學(xué)性能影響不大。(3)采用等效單自由度分析方法,求解了不同截面形式的鋼管混凝土柱在爆炸荷載作用下的最大動力位移。與試驗結(jié)果比較顯示,簡化的理論分析方法能很好地求解整個動力過程的最大動力響應(yīng),而且當材料用量相同時,圓形截面鋼管混凝土柱的抗爆性能要優(yōu)于方形截面鋼管混凝土柱。(4)采用流固耦合的方法建立了鋼管混凝土柱在爆炸荷載作用下的數(shù)值模型,并根據(jù)試驗數(shù)據(jù)對模型參數(shù)進行修正,研究了鋼管混凝土柱的動力響應(yīng)和破壞模式,分析了影響其抗爆性能的因素,并基于豎向剩余承載力損傷評估準則建立了壓力-沖量曲線(P-I曲線)圖。結(jié)果表明,在爆炸荷載作用下,鋼管混凝土柱整體變形較好,且充分發(fā)揮了鋼材和混凝土兩種材料的特性,抗爆性能優(yōu)越;近場爆炸時,鋼管混凝土柱趨向于發(fā)生局部破壞,而遠場爆炸時,鋼管混凝土柱趨向于發(fā)生整體破壞,且其破壞模式與超壓峰值和沖量的大小有關(guān);軸壓比、柱高和比例距離對鋼管混凝土柱的抗爆性能具有顯著影響,材料強度等級、含鋼率、截面形式等因素也具有一定的影響;豎向剩余承載力損傷評估準則與鋼管混凝土柱的破壞模式無關(guān),可以有效反映爆炸荷載作用下鋼管混凝土柱的破壞程度。
[Abstract]:With the change of the target of terrorist attack and the increase of the explosion of natural gas, it is necessary to consider the explosion load properly in the design of civil architecture. The material and structure system with excellent anti-explosion performance is the most effective and most economical way of anti-explosion design. Therefore, the steel pipe concrete column with reasonable stress, good plasticity and excellent fire resistance is used as the research object, mainly from the generation and propagation of the blast shock wave. The dynamic mechanical property of the material, the dynamic response of the steel tube concrete column under the action of explosion load and the damage assessment have been studied systematically. The main research contents and results are as follows: (1) The numerical analysis method is used to simulate the whole process of the generation and propagation of the blast shock wave, and the influence of the grid size on the peak of the blast shock wave overpressure is obtained, the applicability of the explosion similarity law is verified, and the influence of the rigid ground on the propagation of the explosion shock wave is analyzed. The results of the study provide a basis for the accurate simulation of the blast shock wave: the sensitivity of the peak to the size of the explosion is reduced with the increase of the proportion distance, and when the scale is small, the error of the similar law of the explosion is larger. The peak of the overpressure of the blast shock wave can be obviously increased due to the reflection of the rigid ground, but the enhancement effect can be weakened with the increase of the initiation height, and the enhancement effect can be ignored when the initiation height is increased to a certain value. (2) The dynamic mechanical properties of concrete, steel, steel tube concrete under single-axis stress state and the dynamic mechanical properties of concrete under the passive confining pressure are studied by using the numerical model of the split Hopkinson pressure bar (SHPB) test, and the sensitivity of the parameters of the HJC model is also analyzed. The results of the study can provide a basis for the establishment of the numerical model of the steel tube concrete column under the action of the explosion load: the concrete, the steel and the steel pipe concrete are both strain rate sensitive materials, and the strength of the material increases with the increase of the strain rate; The HJC model is suitable for simulating the dynamic mechanical property of the concrete under various stress states; the numerical model can be modified according to the sensitivity of the parameters of the HJC model; and the influence of the bonding slip between the steel pipe and the concrete on the dynamic mechanical property of the steel pipe concrete is not large. (3) The equivalent single-degree-of-freedom analysis method is adopted to solve the maximum dynamic displacement of the steel tube concrete column in different sections under the action of explosion load. Compared with the test results, the simplified theoretical analysis method can well solve the maximum dynamic response of the whole power process, and when the material is used in the same amount, the anti-explosion property of the circular cross-section steel tube concrete column can be better than that of the square-section steel tube concrete column. and (4) the numerical model of the steel tube concrete column under the action of explosion loading is established by adopting a flow-solid coupling method, the model parameters are corrected according to the test data, the dynamic response and the failure mode of the steel tube concrete column are researched, the factors influencing the anti-explosion performance of the steel tube concrete column are analyzed, and a pressure-impulse curve (P-I curve) graph is established based on the vertical residual bearing capacity damage evaluation criterion. The results show that, under the action of explosion load, the whole deformation of the steel tube concrete column is good, and the properties of both the steel and the concrete are fully exerted, and the anti-explosion performance is superior; in the near field explosion, the steel tube concrete column tends to be partially destroyed, and the far field explosion, The steel tube concrete column tends to be destroyed as a whole, and its failure mode is related to the magnitude of the overpressure peak and the impulse; the shaft pressure ratio, the column height and the proportional distance can have a significant influence on the anti-explosion performance of the steel tube concrete column, the material strength grade, the steel-containing rate, The cross-sectional form and other factors also have a certain influence; the damage evaluation criterion of the vertical residual bearing capacity is independent of the failure mode of the steel pipe concrete column, and the damage degree of the steel pipe concrete column under the action of the explosion load can be effectively reflected.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU398.9;TU311.3
本文編號：2378194
[Abstract]:With the change of the target of terrorist attack and the increase of the explosion of natural gas, it is necessary to consider the explosion load properly in the design of civil architecture. The material and structure system with excellent anti-explosion performance is the most effective and most economical way of anti-explosion design. Therefore, the steel pipe concrete column with reasonable stress, good plasticity and excellent fire resistance is used as the research object, mainly from the generation and propagation of the blast shock wave. The dynamic mechanical property of the material, the dynamic response of the steel tube concrete column under the action of explosion load and the damage assessment have been studied systematically. The main research contents and results are as follows: (1) The numerical analysis method is used to simulate the whole process of the generation and propagation of the blast shock wave, and the influence of the grid size on the peak of the blast shock wave overpressure is obtained, the applicability of the explosion similarity law is verified, and the influence of the rigid ground on the propagation of the explosion shock wave is analyzed. The results of the study provide a basis for the accurate simulation of the blast shock wave: the sensitivity of the peak to the size of the explosion is reduced with the increase of the proportion distance, and when the scale is small, the error of the similar law of the explosion is larger. The peak of the overpressure of the blast shock wave can be obviously increased due to the reflection of the rigid ground, but the enhancement effect can be weakened with the increase of the initiation height, and the enhancement effect can be ignored when the initiation height is increased to a certain value. (2) The dynamic mechanical properties of concrete, steel, steel tube concrete under single-axis stress state and the dynamic mechanical properties of concrete under the passive confining pressure are studied by using the numerical model of the split Hopkinson pressure bar (SHPB) test, and the sensitivity of the parameters of the HJC model is also analyzed. The results of the study can provide a basis for the establishment of the numerical model of the steel tube concrete column under the action of the explosion load: the concrete, the steel and the steel pipe concrete are both strain rate sensitive materials, and the strength of the material increases with the increase of the strain rate; The HJC model is suitable for simulating the dynamic mechanical property of the concrete under various stress states; the numerical model can be modified according to the sensitivity of the parameters of the HJC model; and the influence of the bonding slip between the steel pipe and the concrete on the dynamic mechanical property of the steel pipe concrete is not large. (3) The equivalent single-degree-of-freedom analysis method is adopted to solve the maximum dynamic displacement of the steel tube concrete column in different sections under the action of explosion load. Compared with the test results, the simplified theoretical analysis method can well solve the maximum dynamic response of the whole power process, and when the material is used in the same amount, the anti-explosion property of the circular cross-section steel tube concrete column can be better than that of the square-section steel tube concrete column. and (4) the numerical model of the steel tube concrete column under the action of explosion loading is established by adopting a flow-solid coupling method, the model parameters are corrected according to the test data, the dynamic response and the failure mode of the steel tube concrete column are researched, the factors influencing the anti-explosion performance of the steel tube concrete column are analyzed, and a pressure-impulse curve (P-I curve) graph is established based on the vertical residual bearing capacity damage evaluation criterion. The results show that, under the action of explosion load, the whole deformation of the steel tube concrete column is good, and the properties of both the steel and the concrete are fully exerted, and the anti-explosion performance is superior; in the near field explosion, the steel tube concrete column tends to be partially destroyed, and the far field explosion, The steel tube concrete column tends to be destroyed as a whole, and its failure mode is related to the magnitude of the overpressure peak and the impulse; the shaft pressure ratio, the column height and the proportional distance can have a significant influence on the anti-explosion performance of the steel tube concrete column, the material strength grade, the steel-containing rate, The cross-sectional form and other factors also have a certain influence; the damage evaluation criterion of the vertical residual bearing capacity is independent of the failure mode of the steel pipe concrete column, and the damage degree of the steel pipe concrete column under the action of the explosion load can be effectively reflected.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU398.9;TU311.3
【參考文獻】
相關(guān)期刊論文 前10條
1 龔順風(fēng);朱升波;張愛暉;金偉良;;爆炸荷載的數(shù)值模擬及近爆作用鋼筋混凝土板的動力響應(yīng)[J];北京工業(yè)大學(xué)學(xué)報;2011年02期
2 楊鑫;石少卿;程鵬飛;;空氣中TNT爆炸沖擊波超壓峰值的預(yù)測及數(shù)值模擬[J];爆破;2008年01期
3 李利莎;謝清糧;鄭全平;張洪海;杜建國;;基于Lagrange、ALE和SPH算法的接觸爆炸模擬計算[J];爆破;2011年01期
4 胡昌明,賀紅亮,胡時勝;45號鋼的動態(tài)力學(xué)性能研究[J];爆炸與沖擊;2003年02期
5 劉海峰;寧建國;;沖擊荷載作用下混凝土材料的細觀本構(gòu)模型[J];爆炸與沖擊;2009年03期
6 胡時勝,王道榮,劉劍飛;混凝土材料動態(tài)力學(xué)性能的實驗研究[J];工程力學(xué);2001年05期
7 商霖,寧建國;強沖擊載荷下混凝土動態(tài)本構(gòu)關(guān)系[J];工程力學(xué);2005年02期
8 李鑫;吳桂英;賈昊凱;;擋墻對爆炸沖擊波傳播影響的數(shù)值模擬[J];工程力學(xué);2012年02期
9 何遠明;霍靜思;陳柏生;;高溫下鋼管混凝土SHPB動態(tài)力學(xué)性能試驗研究[J];工程力學(xué);2013年01期
10 雷光宇;黨發(fā)寧;陳厚群;;沖擊荷載作用下混凝土破壞強度的確定及CT驗證[J];地震工程與工程振動;2013年03期
相關(guān)博士學(xué)位論文 前2條
1 師燕超;爆炸荷載作用下鋼筋混凝土結(jié)構(gòu)的動態(tài)響應(yīng)行為與損傷破壞機理[D];天津大學(xué);2009年
2 崔瑩;爆炸荷載下復(fù)式空心鋼管混凝土柱的動態(tài)響應(yīng)及損傷評估[D];長安大學(xué);2013年
相關(guān)碩士學(xué)位論文 前2條
1 何遠明;高溫下鋼管混凝土SHPB抗沖擊性能試驗研究和理論分析[D];湖南大學(xué);2011年
2 吳賽;爆炸荷載下復(fù)式鋼管混凝土柱動力響應(yīng)研究[D];長安大學(xué);2012年
，本文編號：2378194
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