【摘要】：近年來,世界范圍內(nèi)的恐怖爆炸襲擊頻繁發(fā)生,且隨著全球化進(jìn)程的加快和經(jīng)濟(jì)的持續(xù)發(fā)展,由于電器老化、煤氣泄漏、易燃易爆物存放不當(dāng)和工業(yè)生產(chǎn)問題而引發(fā)的意外爆炸事故不斷增多。爆炸發(fā)生的過程很短,轉(zhuǎn)瞬即逝,一旦發(fā)生就沒有時間采取措施控制它,它所產(chǎn)生的強(qiáng)烈的爆炸沖擊波作用到爆源附近的建筑物上,不僅會引起建筑物的破壞和損傷,甚至?xí)斐山ㄖ锬酬P(guān)鍵構(gòu)件的失效而喪失承載力,最終導(dǎo)致結(jié)構(gòu)發(fā)生局部或整體的連續(xù)性倒塌,給人類的生命和財(cái)產(chǎn)帶來不可估算的損失,因此加強(qiáng)這一領(lǐng)域的研究顯得尤為重要。承重柱作為組成結(jié)構(gòu)的關(guān)鍵構(gòu)件之一,對于其在爆炸荷載作用下的性能研究十分必要。鋼骨-鋼管混凝土柱(circular steel tube composite columns filled with steel reinforced concrete)作為一種新型的結(jié)構(gòu)形式,現(xiàn)對其在準(zhǔn)靜態(tài)荷載作用下的力學(xué)性能已有一定的模擬研究與試驗(yàn)分析,但對其在爆炸荷載作用下的性能研究較少,故本文以ABAQUS軟件數(shù)值模擬為基礎(chǔ),對爆炸荷載作用下鋼骨—鋼管混凝土柱的動力響應(yīng)進(jìn)行了模擬分析,本文的主要工作如下：(1)對目前國內(nèi)外關(guān)于結(jié)構(gòu)物防爆抗爆研究的現(xiàn)狀進(jìn)行了總結(jié)歸納,對本文所研究的鋼骨—鋼管混凝土結(jié)構(gòu)進(jìn)行了簡要介紹,并對爆炸沖擊荷載的基本特性進(jìn)行了分析研究,針對爆炸沖擊波的各個參數(shù),研究了炸藥量及爆炸距離、爆炸沖擊波的超壓峰值壓力與持續(xù)時間的關(guān)系,確定了適合于建筑物表面爆炸沖擊荷載作用時的爆炸波超壓模型,并將該模型應(yīng)用于ABAQUS動力有限元分析中。(2)為了準(zhǔn)確反映爆炸沖擊荷載作用下結(jié)構(gòu)的動力特性以及破壞機(jī)理,本文模擬時,混凝土采用考慮了損傷及應(yīng)變率效應(yīng)的混凝土損傷塑性模型(即Concrete damaged plasticity),鋼材采用經(jīng)典金屬塑性模型(即Classic metal plasticity),該模型均能很好的模擬混凝土和鋼筋材料在爆炸沖擊荷載作用下的動力響應(yīng)。(3)本文以ABAQUS軟件為基礎(chǔ)對鋼骨—鋼管混凝土柱進(jìn)行數(shù)值模擬,簡要介紹了ABAQUS軟件的功能特點(diǎn),并確定了本文模擬時的計(jì)算模型。(4)運(yùn)用參數(shù)化分析的方法研究了折合距離、CFRP、箍筋、長細(xì)比、軸壓比和端部約束對鋼骨—鋼管混凝土柱抗爆性能的影響,研究表明增大折合距離、使用CFRP加固、加密箍筋間距、減小長細(xì)比、增大軸壓比、采用合理的端部約束條件均能在一定程度上降低鋼骨—鋼管混凝土柱的動力響應(yīng),進(jìn)而提高柱體的抗爆性能。
[Abstract]:In recent years, terrorist bombings have occurred frequently around the world, and with the acceleration of globalization and the sustained development of the economy, gas leakage has occurred due to the aging of electrical appliances. Accidents caused by improper storage of flammable and explosive materials and industrial production problems are increasing. The process of explosion is very short and fleeting. Once it occurs, there is no time to take measures to control it. Its strong blast wave acts on the buildings near the explosion source, which will not only cause damage and damage to the buildings. It may even lead to the failure of a key component of a building and the loss of its bearing capacity, resulting in the local or overall continuous collapse of the structure, resulting in an incalculable loss of human life and property. Therefore, it is particularly important to strengthen the research in this field. As one of the key components of the structure, it is necessary to study the behavior of load-bearing columns under explosive loading. As a new type of structure, the mechanical properties of steel-reinforced concrete filled steel tubular column (circular steel tube composite columns filled with steel reinforced concrete) under quasi-static load have been simulated and tested. However, there is little research on its performance under explosive load. Therefore, based on the numerical simulation of ABAQUS software, the dynamic response of concrete-filled steel tubular column under explosive load is simulated and analyzed in this paper. The main work of this paper is as follows: (1) the current situation of research on explosion and anti-explosion of structures at home and abroad is summarized, and the steel steel-tubular concrete structures studied in this paper are briefly introduced. The basic characteristics of blast shock load are analyzed and studied. According to the parameters of explosion shock wave, the relationship between explosive quantity and explosion distance, the peak pressure of explosion shock wave and the duration of explosion shock wave is studied. The explosion wave overpressure model suitable for the blast impact load on the building surface is determined and applied to the ABAQUS dynamic finite element analysis. (2) in order to accurately reflect the dynamic characteristics and failure mechanism of the structure under the explosive impact load, In this paper, Concrete using damage and strain rate effect of concrete damage plastic model (that is, Concrete damaged plasticity), steel using the classic metal plastic model (i.e. Classic metal plasticity),) this model can well simulate the impact of concrete and reinforced materials in the explosion Dynamic response under impact load. (3) numerical simulation of steel-reinforced concrete filled steel tube column is carried out based on ABAQUS software. The functional characteristics of ABAQUS software are briefly introduced, and the calculation model of this paper is determined. (4) the reduced distance, stirrups, slenderness ratio are studied by using parametric analysis method. The effect of axial compression ratio and end restraint on the anti-explosion performance of steel steel-reinforced concrete filled steel tube column is studied. The results show that increasing the folding distance, using CFRP reinforcement, infilling stirrups spacing, reducing the aspect ratio and increasing the axial compression ratio, Reasonable end restraint conditions can reduce the dynamic response of steel-filled steel tubular columns to a certain extent and then improve the anti-explosion performance of columns.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU398.9;TU311.3

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