地震次生火災作用下RC框架破壞機理分析
發(fā)布時間：2018-10-15 10:11
【摘要】：地震后次生火災己經(jīng)成為震后建筑物面臨的主要威脅與災害。地震和火災的發(fā)生均為小概率事件,然而一旦發(fā)生地震,次生火災卻是發(fā)生概率最高的次生災害之一。震后次生火災造成的人員傷亡和財產(chǎn)損失有時遠遠超過地震本身造成的損失。目前國內(nèi)外學者對建筑結構的抗震性能和抗火性能已經(jīng)進行了廣泛研究,但對于地震和火災聯(lián)合作用下的結構反應研究還很少�；炷量蚣芙Y構作為現(xiàn)代工程建設應用中最廣泛的建筑結構之一,很有必要對其地震火災聯(lián)合作用下的結構性能展開研究。由于鋼筋和混凝土的熱力學性能存在較大差異,震后結構發(fā)生變形,在次生火災作用下結構內(nèi)力重分布復雜,加之沒有成熟的分析方法,RC框架震后抗火性能的研究還處于起步階段。本文基于大量的有限元模型分析,對地震火災聯(lián)合作用下RC框架的內(nèi)力重分布情況和耐火性能進行了深入研究,主要研究內(nèi)容如下:(1)本文基于ABAQUS有限元軟件平臺,建立了地震火災聯(lián)合作用下的RC框架模型。與兩個試驗得到的升溫曲線和側向力-位移曲線進行了對比,驗證了所建模型的合理性和適用性。(2)利用本文建立的地震火災聯(lián)合作用模型和與之形成對比的僅火災作用的模型,研究了局部起火情況下,框架不同受火位置對內(nèi)力重分布的影響,包括柱單面受火、三面受火、四面受火,和梁頂面受火、底部受火,以及梁柱同時受火等多種局部起火情況。研究了RC框架地震和火災聯(lián)合作用下的內(nèi)力重分布情況,并與火災單獨作用下的情況進行對比。(3)利用本文建立的地震火災聯(lián)合作用模型,深入分析了在恒溫受火方式下,不同溫度和受火時間對混凝土構件承載力退化和內(nèi)力重分布情況的影響,并與火災單獨作用模型的情況進行對比。此外,還對不同地震程度下軸壓比對RC框架耐火極限的影響進行了探討。
[Abstract]:Post-earthquake secondary fire has become the main threat and disaster to buildings after earthquake. The occurrence of earthquake and fire are both small probability events, but once earthquake occurs, secondary fire is one of the most likely secondary disasters. The casualties and property losses caused by post-earthquake fire sometimes far outweigh the damage caused by the earthquake itself. At present, scholars at home and abroad have carried out extensive research on the seismic performance and fire resistance of building structures, but there is little research on the structural response under the combined action of earthquake and fire. As one of the most widely used building structures in modern engineering construction, it is necessary to study the structural performance of concrete frame structure under the combined action of earthquake and fire. Due to the great difference between the thermodynamic properties of steel bar and concrete, the structure is deformed after the earthquake, and the redistribution of the internal force of the structure under the action of secondary fire is complicated. In addition, without mature analysis methods, the research on the fire resistance of RC frame after earthquake is still in its infancy. Based on a large number of finite element model analysis, the internal force redistribution and fire resistance of RC frame under the combined action of earthquake and fire are deeply studied in this paper. The main contents are as follows: (1) this paper is based on the ABAQUS finite element software platform. The RC frame model under the combined action of earthquake and fire is established. Compared with the heating curves and lateral force-displacement curves obtained from the two experiments, the rationality and applicability of the proposed model are verified. (2) by using the earthquake fire combined action model established in this paper and the only fire action model compared with the model, In the case of local fire, the influence of different fire position of frame on the redistribution of internal force is studied, including fire on one side of column, fire on three sides, fire on four sides, fire on top of beam, fire at bottom, and fire by Liang Zhu at the same time. The redistribution of internal force under the combined action of earthquake and fire in RC frame is studied and compared with that in the case of fire alone. (3) by using the combined action model of earthquake and fire established in this paper, a deep analysis is made on the fire mode under constant temperature. The effects of different temperature and fire time on the degradation and redistribution of internal force of concrete members are compared with the model of fire alone. In addition, the influence of axial compression ratio on the fire resistance of RC frame is also discussed.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375.4;TU312.3
本文編號：2272211
[Abstract]:Post-earthquake secondary fire has become the main threat and disaster to buildings after earthquake. The occurrence of earthquake and fire are both small probability events, but once earthquake occurs, secondary fire is one of the most likely secondary disasters. The casualties and property losses caused by post-earthquake fire sometimes far outweigh the damage caused by the earthquake itself. At present, scholars at home and abroad have carried out extensive research on the seismic performance and fire resistance of building structures, but there is little research on the structural response under the combined action of earthquake and fire. As one of the most widely used building structures in modern engineering construction, it is necessary to study the structural performance of concrete frame structure under the combined action of earthquake and fire. Due to the great difference between the thermodynamic properties of steel bar and concrete, the structure is deformed after the earthquake, and the redistribution of the internal force of the structure under the action of secondary fire is complicated. In addition, without mature analysis methods, the research on the fire resistance of RC frame after earthquake is still in its infancy. Based on a large number of finite element model analysis, the internal force redistribution and fire resistance of RC frame under the combined action of earthquake and fire are deeply studied in this paper. The main contents are as follows: (1) this paper is based on the ABAQUS finite element software platform. The RC frame model under the combined action of earthquake and fire is established. Compared with the heating curves and lateral force-displacement curves obtained from the two experiments, the rationality and applicability of the proposed model are verified. (2) by using the earthquake fire combined action model established in this paper and the only fire action model compared with the model, In the case of local fire, the influence of different fire position of frame on the redistribution of internal force is studied, including fire on one side of column, fire on three sides, fire on four sides, fire on top of beam, fire at bottom, and fire by Liang Zhu at the same time. The redistribution of internal force under the combined action of earthquake and fire in RC frame is studied and compared with that in the case of fire alone. (3) by using the combined action model of earthquake and fire established in this paper, a deep analysis is made on the fire mode under constant temperature. The effects of different temperature and fire time on the degradation and redistribution of internal force of concrete members are compared with the model of fire alone. In addition, the influence of axial compression ratio on the fire resistance of RC frame is also discussed.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375.4;TU312.3
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