【摘要】：橋梁作為交通樞紐性工程,其在公路、鐵路工程中占據(jù)關(guān)鍵的地位。隨著鋼筋混凝土橋梁地興建,它在運(yùn)營(yíng)過(guò)程中受材料性能、受力荷載、環(huán)境因素的影響,其結(jié)構(gòu)承載能力隨時(shí)間發(fā)展而逐漸降低,當(dāng)降低到極限值時(shí)可能會(huì)發(fā)生橋梁坍塌事故。因此,為了確保橋梁結(jié)構(gòu)運(yùn)營(yíng)的安全,對(duì)其可靠性研究具有非常重要的意義。本文在國(guó)內(nèi)外可靠度研究的基礎(chǔ)上,介紹了橋梁結(jié)構(gòu)可靠度、使用壽命概念,分析了新建、在役RC橋梁使用壽命、剩余壽命的研究方法,并采用蒙特卡羅法進(jìn)行在役橋梁可靠度分析,主要完成了以下幾項(xiàng)工作:1.分析了在役鋼筋混凝土橋梁在環(huán)境作用下的混凝土碳化、鋼筋銹蝕等耐久性損失過(guò)程,研究了混凝土抗壓強(qiáng)度、混凝土彈性模量、鋼筋強(qiáng)度等時(shí)變抗力模型,并分析了不同規(guī)范中作用在橋梁上的車(chē)輛荷載值以及橫縱分布位置,為準(zhǔn)確分析在役鋼筋混凝土橋梁時(shí)變可靠度提供了數(shù)據(jù)支撐;2.介紹了ANSYS中的PDS分析模塊,并以鋼筋混凝土梁為實(shí)例,以ANSYS分離式模型在不同荷載下的撓度值與試驗(yàn)值相近,驗(yàn)證了ANSYS有限元模擬的準(zhǔn)確性以及ANSYS分析鋼筋混凝土梁可靠度的可行性;3.以某在役RC橋梁為工程背景,在對(duì)該橋梁進(jìn)行外觀和無(wú)損檢測(cè)的基礎(chǔ)上得出T梁鋼筋銹蝕、混凝土碳化、混凝土抗壓強(qiáng)度等基本狀態(tài),并以T梁活載、恒載、混凝土抗壓強(qiáng)度、混凝土彈性模量、鋼筋截面積、鋼筋抗拉強(qiáng)度等為隨機(jī)變量在T梁剛度和強(qiáng)度為判斷準(zhǔn)則下進(jìn)行時(shí)變可靠度分析,從而得出不同時(shí)間橋梁的可靠度,并預(yù)測(cè)出該橋的使用壽命與剩余壽命。
[Abstract]:As a transportation hub, bridge plays a key role in highway and railway engineering. With the construction of reinforced concrete bridge, the bearing capacity of reinforced concrete bridge decreases gradually with the development of time, and the bridge collapse accident may occur when it is reduced to the limit value. Therefore, in order to ensure the safety of bridge structure operation, it is of great significance to study its reliability. Based on the research of reliability at home and abroad, this paper introduces the concept of reliability and service life of bridge structure, and analyzes the research methods of service life and residual life of newly built and existing RC bridges. Monte Carlo method is used to analyze the reliability of existing bridges. The main works are as follows: 1. The durability loss processes of existing reinforced concrete bridges such as carbonation and corrosion of steel bars are analyzed. The time-varying resistance models such as compressive strength of concrete, elastic modulus of concrete and strength of steel bar are studied. The vehicle load value and the transverse and longitudinal distribution position of the bridge acting in different codes are analyzed, which provides the data support for the accurate analysis of time-varying reliability of the existing reinforced concrete bridge. 2. The PDS analysis module in ANSYS is introduced. Taking reinforced concrete beam as an example, the deflection value of ANSYS separation model under different loads is close to the experimental value. The accuracy of ANSYS finite element simulation and the feasibility of ANSYS to analyze the reliability of reinforced concrete beams are verified. 3. Taking a RC bridge in service as the engineering background, on the basis of the appearance and nondestructive testing of the bridge, the basic states of T beam steel bar corrosion, concrete carbonization and concrete compressive strength are obtained, and the T beam live load, dead load, concrete compressive strength, etc. Under the criterion of T beam stiffness and strength, the time-varying reliability analysis of concrete elastic modulus, section area and tensile strength of steel bar is carried out, and the reliability of bridges at different times is obtained. The service life and remaining life of the bridge are predicted.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U445.7;U448.34

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本文編號(hào)：2402412