本文選題：高樁碼頭　切入點(diǎn)：材料衰減　出處：《天津大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：高樁碼頭是一種可以很好的適用于各種復(fù)雜地基情況的碼頭結(jié)構(gòu)形式,因而被廣泛的運(yùn)用于港口工程領(lǐng)域。但高樁碼頭也存在這嚴(yán)重的耐久性問(wèn)題,很多碼頭在設(shè)計(jì)使用期內(nèi)就會(huì)發(fā)生嚴(yán)重的耐久性損傷,導(dǎo)致結(jié)構(gòu)的承載力無(wú)法滿足要求或者結(jié)構(gòu)的變形過(guò)大嚴(yán)重的影響了碼頭的正常使用。目前,對(duì)于鋼筋混凝土結(jié)構(gòu)材料和構(gòu)件層次的研究已經(jīng)比較成熟,但對(duì)于結(jié)構(gòu)整體的耐久性研究還沒(méi)有一個(gè)比較簡(jiǎn)單使用的評(píng)定方法。比較準(zhǔn)確的結(jié)構(gòu)整體耐久性分析方法大多基于比較復(fù)雜的概率論以及比較嚴(yán)格繁瑣的數(shù)學(xué)推到,難以被一般的結(jié)構(gòu)設(shè)計(jì)人員所掌握;比較簡(jiǎn)單的結(jié)構(gòu)整體耐久性分析方法大多依靠專家的主觀意志,偏差較大,不能很好的反映結(jié)構(gòu)實(shí)際的耐久性損傷情況。因此,本文基于當(dāng)前比較成熟的鋼筋混凝土材料層次的耐久性研究成果,從結(jié)構(gòu)承載力安全性和結(jié)構(gòu)變形使用性的角度提出比較可靠實(shí)用的高樁碼頭結(jié)構(gòu)整體的耐久性評(píng)定方法。建立高樁碼頭三維有限元模型,以材料的離散性劃分時(shí)間點(diǎn),計(jì)算得出碼頭結(jié)構(gòu)構(gòu)件在各離散時(shí)間點(diǎn)的內(nèi)力響應(yīng);對(duì)于單一的離散時(shí)間點(diǎn),從結(jié)構(gòu)構(gòu)件的安全性和使用性角度,計(jì)算出碼頭各主要受力構(gòu)件的安全性時(shí)不變耐久性評(píng)定指標(biāo)和使用性時(shí)不變耐久性評(píng)定指標(biāo);隨后,根據(jù)各離散點(diǎn)的各耐久性評(píng)定指標(biāo),先繪出各構(gòu)件的安全性和使用性的時(shí)變耐久性評(píng)定曲線,再通過(guò)構(gòu)件的各類(lèi)評(píng)定曲線匯總繪出總體構(gòu)件的安全性和使用性時(shí)變耐久性評(píng)定曲線的最小包絡(luò)曲線,即為結(jié)構(gòu)整體的安全性和使用性時(shí)變耐久性評(píng)定曲線。最后,將結(jié)構(gòu)整體的安全性和使用性時(shí)變耐久性評(píng)定曲線做匯總,作出兩條曲線的最小包絡(luò)曲線即為高樁碼頭結(jié)構(gòu)整體的耐久性評(píng)定曲線,根據(jù)此曲線以及相應(yīng)的耐久性失效準(zhǔn)則得出結(jié)構(gòu)相應(yīng)的使用年限。
[Abstract]:High pile wharf is a kind of wharf structure which can be applied to various complex ground conditions, so it is widely used in the field of port engineering. However, there is a serious durability problem in high pile wharf. Many wharves will suffer serious durability damage during their design and use, resulting in the failure of the bearing capacity of the structure to meet the requirements or the excessive deformation of the structure, which seriously affects the normal use of the wharf. For reinforced concrete structure materials and members of the level of research has been relatively mature, However, there is not a simple evaluation method for the durability of the whole structure. The more accurate analysis methods of the overall durability of the structure are mostly based on the more complicated probability theory and the strict and complicated mathematics. It is difficult to master by the general structural designers, and the relatively simple analysis methods of the overall durability of the structure rely on the subjective will of the experts, and the deviation is large, which can not well reflect the actual durability damage of the structure. This paper is based on the current mature research results of durability of reinforced concrete material layers. From the point of view of structural bearing capacity safety and structural deformation usage, a more reliable and practical method for evaluating the durability of high pile wharf structure is put forward. A three-dimensional finite element model of high pile wharf is established, and the time points are divided according to the material discreteness. The internal force response of wharf structural members at each discrete time point is calculated, and for a single discrete time point, from the point of view of the safety and usability of the structural members, The durability evaluation index and the durability evaluation index of the main load-bearing members of the wharf are calculated. Then, according to the durability evaluation indexes of each discrete point, the durability evaluation index of the main load-bearing member of the wharf is calculated. First, the time-varying durability evaluation curves of each component are drawn, and then the minimum envelope curves of the safety and serviceability time-varying durability assessment curves of the overall members are drawn by the various evaluation curves of the components. That is, the overall safety and durability evaluation curve of the whole structure. Finally, the overall safety of the structure and the use of the time-varying durability evaluation curve are summarized. The minimum envelope curve of the two curves is the overall durability evaluation curve of the high pile wharf structure. According to this curve and the corresponding durability failure criterion, the corresponding service life of the structure is obtained.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U656.113

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