本文關鍵詞： 氣云爆炸 動力響應 損傷評估 超壓沖量曲線　出處：《南京理工大學》2016年碩士論文　論文類型：學位論文

【摘要】：隨著石油化工業(yè)的發(fā)展,生產(chǎn)規(guī)模的擴大,氣云爆炸事故多發(fā),不僅威脅人們的生命財產(chǎn)安全,也會禍及周圍建筑結(jié)構(gòu),造成結(jié)構(gòu)破壞甚至整體倒塌。目前關于氣云爆炸的研究進展較慢,急需展開關于氣云爆炸下結(jié)構(gòu)破壞效應的深入研究。本文在氣云爆炸下理想彈性體動力響應的理論分析的基礎上,采用數(shù)值模擬方法,研究分析了鋼筋屈服強度、鋼筋間距、氣云半徑因素對氣云爆炸下抗爆墻的動力響應的影響規(guī)律；選用超壓沖量破壞準則,以支座轉(zhuǎn)角作為損傷評估指標,計算出氣云爆炸下抗爆墻的損傷等級評估超壓沖量P-I曲線,并分析了鋼筋屈服強度、鋼筋間距和抗爆墻的墻厚因素對損傷等級評估超壓沖量P-I曲線的影響；根據(jù)超壓沖量P-I曲線擬合出損傷等級評估公式。研究的主要結(jié)論：(1)抗爆墻裂縫主要集中在迎爆面四周和背爆面中部這些受拉部位,在裂縫周圍的混凝土和鋼筋出現(xiàn)應力重分布現(xiàn)象。氣云爆炸沖擊波作用結(jié)束前,在迎爆面中部和背爆面四周的受壓區(qū)域顯現(xiàn)少量裂縫。(2)鋼筋屈服強度對抗爆性能的提高微乎其微,提高幅度最大的為0.89%。相較之下減小鋼筋間距可適當減弱抗爆墻的動力響應,減弱幅度為2.80%-10.54%不等,而氣云半徑對鋼筋混凝土抗爆墻的動力響應影響最為顯著,影響幅度最小可達到51.19%。(3)增加墻厚使P-I曲線向右上方移動,墻厚對損傷程度的影響最為顯著,同等超壓值下沖量增幅最小為31.728%,最大的增幅為225.104%。鋼筋間距對損傷程度的影響較大,同等超壓值下沖量增幅在4.5%-9.5%左右,鋼筋屈服強度對對損傷程度的影響最弱,同等超壓值下沖量增幅在2%左右,最小增幅為0.45%,接近于O。
[Abstract]:With the development of petrochemical industry, the expansion of production scale, gas cloud explosion accidents, not only threaten the safety of people's lives and property, but also damage the surrounding building structure. At present, the research progress of gas cloud explosion is slow. In this paper, based on the theoretical analysis of the dynamic response of the ideal elastic body under the gas cloud explosion, the numerical simulation method is adopted. The influence of the yield strength of steel bar, steel bar spacing and the radius of gas cloud on the dynamic response of anti-explosion wall under gas cloud explosion is studied and analyzed. According to the criterion of overpressure impulse failure and the angle of bearing as the damage evaluation index, the P-I curve of damage grade evaluation of anti-explosion wall under the explosion of gas cloud is calculated, and the yield strength of steel bar is analyzed. The influence of the steel bar spacing and the wall thickness of the anti-explosion wall on the P-I curve of the damage grade evaluation of the overpressure impulse; According to the P-I curve of overpressure impulse, the damage grade evaluation formula is fitted. The main conclusion of the study is that the crack of anti-explosion wall is mainly concentrated around the face of the explosion and the middle of the back surface. Stress redistribution occurs in the concrete and steel bar around the crack. In the middle of the face and around the back blasting surface, a small amount of cracks. 2) the yield strength of steel bar is improved very little. The maximum increase range is 0.89.The dynamic response of the anti-explosion wall can be weakened by decreasing the steel bar spacing, which ranges from 2.80% to 10.54%. The influence of the radius of gas cloud on the dynamic response of reinforced concrete anti-explosion wall is the most significant, and the minimum influence range can reach 51.19 and increase the thickness of the wall to make the P-I curve move to the upper right. The effect of wall thickness on damage degree is the most significant, the minimum increase of impulse is 31.728 under the same overpressure, and the biggest increase is 225.104. The distance between steel bars has a great influence on the damage degree. The increase of impulse is about 4.5% -9.5% under the same overpressure value. The yield strength of steel bar has the weakest effect on the damage degree. The impulse increase is about 2% under the same overpressure value and the minimum increase is 0.45%. Close to O.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TU311.3

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