高樁碼頭結(jié)構(gòu)時變可靠度分析方法研究
發(fā)布時間：2018-10-07 20:50
【摘要】：海洋環(huán)境下混凝土碼頭面臨的耐久性問題十分嚴(yán)重。高樁碼頭是港口碼頭重要的結(jié)構(gòu)形式之一,其腐蝕破壞較為嚴(yán)重,破壞部位主要發(fā)生在處于浪濺區(qū)的縱橫、面板、樁以及樁帽,致使高樁碼頭承載能力明顯降低。隨著時間推移,銹蝕高樁碼頭的耐久性病害導(dǎo)致的結(jié)構(gòu)失效問題將越來越普遍。高樁碼頭安全狀態(tài)評估是保證港口設(shè)施正常安全運(yùn)行的必要措施。目前,規(guī)范仍采用時不變可靠度方法對碼頭構(gòu)件的安全性進(jìn)行評價,不能考慮結(jié)構(gòu)承載力的時變特性。因此,建立有效的高樁碼頭時變可靠度分析方法是十分必要的。針對以上問題,本文開展了以下研究工作:(1)第一章總結(jié)了國內(nèi)外現(xiàn)有的時變可靠度計算方法研究進(jìn)展以及所存在的問題。(2)第二章根據(jù)設(shè)計基準(zhǔn)期區(qū)段化的思想,在借鑒前人研究成果的基礎(chǔ)上,建立了考慮結(jié)構(gòu)承載力隨時間衰減的適于工程應(yīng)用、簡便易行的時變可靠度計算方法。相比于已有方法,本文建立的新方法不局限于最大可變荷載的分布類型必須是極值I型的條件;且新方法只需通過一次積分便可直接計算得出可靠概率,免去了已有方法先求等效抗力,進(jìn)而采用JC法反復(fù)迭代的復(fù)雜過程。(3)第三章研究了高樁碼頭承載力的影響因素;根據(jù)影響因素是否導(dǎo)致承載力的衰減,將這些因素分為兩個大類,即“承載力隨機(jī)性影響因素”和“承載力衰減性影響因素”,并建立各類影響因素的概率模型;根據(jù)海洋環(huán)境下鋼筋混凝土結(jié)構(gòu)耐久性破壞機(jī)理,建立了承載力衰減性影響因素概率模型。(4)第四章在高樁碼頭承載力影響因素概率模型基礎(chǔ)上,結(jié)合兩類已有的抗力隨機(jī)過程模型,建立了碼頭各類構(gòu)件的承載力退化模型;該退化模型的表達(dá)式亦適用于描述整體碼頭的承載力。根據(jù)第二章所建立的時變可靠度計算方法,計算碼頭各個構(gòu)件的時變可靠指標(biāo)。(5)第五章在高樁碼頭承載力影響因素的概率模型基礎(chǔ)上,采用大型通用有限元軟件ANSYS作為輔助分析工具,通過蒙特卡洛模擬,建立了四種荷載工況下,考慮時間因素的高樁碼頭整體承載力隨機(jī)過程模型;基于整體承載力隨機(jī)過程模型,建立了高樁碼頭結(jié)構(gòu)整體時變可靠度分析方法。(6)第六章將針對一個工程實(shí)例,采用本文建立的時變可靠度計算方法以及碼頭承載力隨機(jī)過程模型,進(jìn)行碼頭構(gòu)件以及整體碼頭的時變可靠度分析,以全面綜合地展示本文的研究內(nèi)容。
[Abstract]:The durability of concrete wharf in marine environment is very serious. High pile wharf is one of the important structural forms of port wharf, and its corrosion damage is more serious. The damage site mainly occurs in the vertical and horizontal side, face slab, pile and pile cap in the splash area, which results in the obvious reduction of the bearing capacity of the high pile wharf. With the passage of time, structural failure caused by durability disease of corroded pile wharf will become more and more common. The safety assessment of high-pile wharf is an essential measure to ensure the normal and safe operation of port facilities. At present, the method of time-invariant reliability is still used to evaluate the safety of wharf members, and the time-varying characteristics of structural bearing capacity can not be considered. Therefore, it is necessary to establish an effective time-varying reliability analysis method for high pile wharf. In order to solve the above problems, this paper has carried out the following research work: (1) the first chapter summarizes the research progress and existing problems of time-varying reliability calculation methods at home and abroad. (2) the second chapter is based on the idea of segmenting the design base period. Based on the previous research results, a simple and convenient time-varying reliability calculation method considering the attenuation of structural bearing capacity with time is established. Compared with the existing methods, the new method established in this paper is not limited to the condition that the distribution type of the maximum variable load must be the extreme I type, and the new method can directly calculate the reliable probability by only one integral. The complex process of iterative iteration with JC method is avoided. (3) in chapter 3, the influence factors of bearing capacity of high pile wharf are studied, according to whether the influence factors lead to the attenuation of bearing capacity. These factors are divided into two categories, that is, "random bearing capacity influencing factors" and "bearing capacity attenuation influencing factors", and the probability models of these factors are established, according to the durability failure mechanism of reinforced concrete structures under marine environment, The probability model of bearing capacity attenuation factors is established. (4) based on the probabilistic model of bearing capacity of high pile wharf, combined with two kinds of stochastic process models of resistance, the degradation model of bearing capacity of various components of wharf is established. The expression of the degradation model can also be used to describe the bearing capacity of the whole wharf. According to the time-varying reliability calculation method established in the second chapter, the time-varying reliability index of each member of the wharf is calculated. (5) the fifth chapter is based on the probability model of the factors affecting the bearing capacity of the high-pile wharf. By Monte Carlo simulation, the stochastic process model of the whole bearing capacity of high pile wharf under four load conditions considering time factors is established by using ANSYS, a general finite element software, as an auxiliary analysis tool. Based on the stochastic process model of overall bearing capacity, a method of global time-varying reliability analysis of high pile wharf structure is established. (6) in chapter 6, an engineering example is presented. The time-varying reliability calculation method and the random process model of wharf bearing capacity are used to analyze the time-varying reliability of wharf members and the whole wharf in order to show the research contents of this paper comprehensively and synthetically.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U656.113
[Abstract]:The durability of concrete wharf in marine environment is very serious. High pile wharf is one of the important structural forms of port wharf, and its corrosion damage is more serious. The damage site mainly occurs in the vertical and horizontal side, face slab, pile and pile cap in the splash area, which results in the obvious reduction of the bearing capacity of the high pile wharf. With the passage of time, structural failure caused by durability disease of corroded pile wharf will become more and more common. The safety assessment of high-pile wharf is an essential measure to ensure the normal and safe operation of port facilities. At present, the method of time-invariant reliability is still used to evaluate the safety of wharf members, and the time-varying characteristics of structural bearing capacity can not be considered. Therefore, it is necessary to establish an effective time-varying reliability analysis method for high pile wharf. In order to solve the above problems, this paper has carried out the following research work: (1) the first chapter summarizes the research progress and existing problems of time-varying reliability calculation methods at home and abroad. (2) the second chapter is based on the idea of segmenting the design base period. Based on the previous research results, a simple and convenient time-varying reliability calculation method considering the attenuation of structural bearing capacity with time is established. Compared with the existing methods, the new method established in this paper is not limited to the condition that the distribution type of the maximum variable load must be the extreme I type, and the new method can directly calculate the reliable probability by only one integral. The complex process of iterative iteration with JC method is avoided. (3) in chapter 3, the influence factors of bearing capacity of high pile wharf are studied, according to whether the influence factors lead to the attenuation of bearing capacity. These factors are divided into two categories, that is, "random bearing capacity influencing factors" and "bearing capacity attenuation influencing factors", and the probability models of these factors are established, according to the durability failure mechanism of reinforced concrete structures under marine environment, The probability model of bearing capacity attenuation factors is established. (4) based on the probabilistic model of bearing capacity of high pile wharf, combined with two kinds of stochastic process models of resistance, the degradation model of bearing capacity of various components of wharf is established. The expression of the degradation model can also be used to describe the bearing capacity of the whole wharf. According to the time-varying reliability calculation method established in the second chapter, the time-varying reliability index of each member of the wharf is calculated. (5) the fifth chapter is based on the probability model of the factors affecting the bearing capacity of the high-pile wharf. By Monte Carlo simulation, the stochastic process model of the whole bearing capacity of high pile wharf under four load conditions considering time factors is established by using ANSYS, a general finite element software, as an auxiliary analysis tool. Based on the stochastic process model of overall bearing capacity, a method of global time-varying reliability analysis of high pile wharf structure is established. (6) in chapter 6, an engineering example is presented. The time-varying reliability calculation method and the random process model of wharf bearing capacity are used to analyze the time-varying reliability of wharf members and the whole wharf in order to show the research contents of this paper comprehensively and synthetically.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U656.113
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