基于未確知測度理論懸澆連續(xù)—剛構(gòu)橋梁施工期的風(fēng)險評估
發(fā)布時間：2019-03-08 08:51
【摘要】：隨著中國公路、鐵路快速發(fā)展,城市化水平持續(xù)提高,交通客貨運輸需求呈持續(xù)增長態(tài)勢,對既有橋梁運營的結(jié)構(gòu)安全提出了挑戰(zhàn),也對新建橋梁的建設(shè)提出了更高的要求。受氣候、地形、環(huán)境等各方面因素影響,公路橋梁建設(shè)的技術(shù)難度各有差別,且限于當(dāng)前技術(shù)水平,工程上對施工安全影響因素和未知突發(fā)情況的認(rèn)識不夠全面,造成了施工風(fēng)險因素的不確定性,使得橋梁施工安全狀況難以把握。因此論文綜合考慮影響施工安全的不確定因素,系統(tǒng)分析了在建橋梁的施工風(fēng)險狀況,針對性的提出了相應(yīng)的風(fēng)險應(yīng)對措施,主要成果如下：1、論文以二廣高速湖南境內(nèi)某特大橋為工程依托,在對多種風(fēng)險評價方法進行綜合研究和分析的基礎(chǔ)上,引入了未確知測度理論對橋梁施工進行了風(fēng)險評估,建立了懸臂澆筑連續(xù)-剛0構(gòu)橋梁的施工風(fēng)險評價系統(tǒng)。2、結(jié)合橋梁施工過程中存在的實際風(fēng)險,對各風(fēng)險因素進行了定性分析,明確了風(fēng)險因素的層級結(jié)構(gòu),確定了其評價指標(biāo)的取值標(biāo)準(zhǔn),建立了風(fēng)險因素指標(biāo)體系,并依此構(gòu)建了各評價指標(biāo)的單指標(biāo)未確知測度函數(shù)。3、利用熵權(quán)法計算了專家評分值,確定了單指標(biāo)未確知測度的權(quán)重,得到了多指標(biāo)未確知綜合測度向量。4、通過模糊評價分析法的置信度準(zhǔn)則,對綜合測度向量進行識別排序,確定了其風(fēng)險等級,提出了相應(yīng)的風(fēng)險應(yīng)對措施。
[Abstract]:With the rapid development of China's highways and railways, the continuous improvement of urbanization level and the continuous growth of passenger and freight transport demand, it challenges the structural safety of existing bridges and puts forward higher requirements for the construction of new bridges. Affected by climate, topography, environment and other factors, the technical difficulty of highway and bridge construction is different, and is limited to the current technical level, and the engineering understanding of the factors affecting construction safety and unknown emergencies is not comprehensive enough. The uncertainty of construction risk factors makes the safety of bridge construction difficult to grasp. Therefore, considering the uncertain factors that affect the construction safety, the paper systematically analyzes the construction risk situation of the bridge under construction, and puts forward the corresponding risk countermeasures. The main results are as follows: 1, On the basis of comprehensive research and analysis of various risk assessment methods, the paper introduces the theory of unascertained measure to assess the risk of bridge construction, based on the project of a large bridge in Erguang Expressway, Hunan Province, based on the comprehensive research and analysis of a variety of risk assessment methods. The construction risk evaluation system of cantilever continuous-rigid 0-frame bridge is established. 2. Combined with the actual risk existing in the construction process of the bridge, the qualitative analysis of the risk factors is carried out, and the hierarchy structure of the risk factors is defined. The standard of evaluation index is determined, the index system of risk factors is established, and the unascertained measure function of single index for each evaluation index is constructed. 3, the evaluation value of experts is calculated by entropy method, and the evaluation value of experts is calculated by entropy method, and the evaluation value of experts is calculated by entropy method. The weight of single index unascertained measure is determined, and the multi-index unascertained synthesis measure vector is obtained. 4. Through the confidence criterion of fuzzy evaluation analysis method, the synthetic measure vector is identified and sorted, and its risk grade is determined. The corresponding risk countermeasures are put forward.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445
，
本文編號：2436640
[Abstract]:With the rapid development of China's highways and railways, the continuous improvement of urbanization level and the continuous growth of passenger and freight transport demand, it challenges the structural safety of existing bridges and puts forward higher requirements for the construction of new bridges. Affected by climate, topography, environment and other factors, the technical difficulty of highway and bridge construction is different, and is limited to the current technical level, and the engineering understanding of the factors affecting construction safety and unknown emergencies is not comprehensive enough. The uncertainty of construction risk factors makes the safety of bridge construction difficult to grasp. Therefore, considering the uncertain factors that affect the construction safety, the paper systematically analyzes the construction risk situation of the bridge under construction, and puts forward the corresponding risk countermeasures. The main results are as follows: 1, On the basis of comprehensive research and analysis of various risk assessment methods, the paper introduces the theory of unascertained measure to assess the risk of bridge construction, based on the project of a large bridge in Erguang Expressway, Hunan Province, based on the comprehensive research and analysis of a variety of risk assessment methods. The construction risk evaluation system of cantilever continuous-rigid 0-frame bridge is established. 2. Combined with the actual risk existing in the construction process of the bridge, the qualitative analysis of the risk factors is carried out, and the hierarchy structure of the risk factors is defined. The standard of evaluation index is determined, the index system of risk factors is established, and the unascertained measure function of single index for each evaluation index is constructed. 3, the evaluation value of experts is calculated by entropy method, and the evaluation value of experts is calculated by entropy method, and the evaluation value of experts is calculated by entropy method. The weight of single index unascertained measure is determined, and the multi-index unascertained synthesis measure vector is obtained. 4. Through the confidence criterion of fuzzy evaluation analysis method, the synthetic measure vector is identified and sorted, and its risk grade is determined. The corresponding risk countermeasures are put forward.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445
，
本文編號：2436640
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