本文選題：高樁碼頭　切入點：材料衰減　出處：《天津大學》2014年碩士論文　論文類型：學位論文

【摘要】：高樁碼頭是一種可以很好的適用于各種復雜地基情況的碼頭結構形式,因而被廣泛的運用于港口工程領域。但高樁碼頭也存在這嚴重的耐久性問題,很多碼頭在設計使用期內就會發(fā)生嚴重的耐久性損傷,導致結構的承載力無法滿足要求或者結構的變形過大嚴重的影響了碼頭的正常使用。目前,對于鋼筋混凝土結構材料和構件層次的研究已經(jīng)比較成熟,但對于結構整體的耐久性研究還沒有一個比較簡單使用的評定方法。比較準確的結構整體耐久性分析方法大多基于比較復雜的概率論以及比較嚴格繁瑣的數(shù)學推到,難以被一般的結構設計人員所掌握;比較簡單的結構整體耐久性分析方法大多依靠專家的主觀意志,偏差較大,不能很好的反映結構實際的耐久性損傷情況。因此,本文基于當前比較成熟的鋼筋混凝土材料層次的耐久性研究成果,從結構承載力安全性和結構變形使用性的角度提出比較可靠實用的高樁碼頭結構整體的耐久性評定方法。建立高樁碼頭三維有限元模型,以材料的離散性劃分時間點,計算得出碼頭結構構件在各離散時間點的內力響應;對于單一的離散時間點,從結構構件的安全性和使用性角度,計算出碼頭各主要受力構件的安全性時不變耐久性評定指標和使用性時不變耐久性評定指標;隨后,根據(jù)各離散點的各耐久性評定指標,先繪出各構件的安全性和使用性的時變耐久性評定曲線,再通過構件的各類評定曲線匯總繪出總體構件的安全性和使用性時變耐久性評定曲線的最小包絡曲線,即為結構整體的安全性和使用性時變耐久性評定曲線。最后,將結構整體的安全性和使用性時變耐久性評定曲線做匯總,作出兩條曲線的最小包絡曲線即為高樁碼頭結構整體的耐久性評定曲線,根據(jù)此曲線以及相應的耐久性失效準則得出結構相應的使用年限。
[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.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U656.113

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