【摘要】：自從第一座拱橋誕生于羅馬時(shí)代的英國(guó)以來,隨著新材料新技術(shù)的快速發(fā)展,在現(xiàn)今交通網(wǎng)絡(luò)中,拱橋已占相當(dāng)大的比例,尤其鋼筋混凝土拱橋。這些橋梁經(jīng)過多年的工作,加上不良環(huán)境的侵蝕、自然因素的影響、材料性質(zhì)變化等原因,許多在役橋梁產(chǎn)生了不同程度的損壞。統(tǒng)計(jì)表明,鋼筋銹蝕已成為鋼筋混凝土(RC)拱橋損傷的主要原因之一。同時(shí),由銹蝕引起的開裂損傷也已成為銹蝕構(gòu)件剩余承載能力評(píng)估的關(guān)鍵。由于既有拱橋在混凝土開裂、鋼筋銹蝕等方面有著很大的不確定性,因此,對(duì)RC拱肋靜力特性的準(zhǔn)確評(píng)定仍具有很大的挑戰(zhàn)性。本文對(duì)國(guó)內(nèi)外銹脹損傷RC拱橋的研究情況進(jìn)行了總結(jié)。銹蝕RC結(jié)構(gòu)的靜力特性研究目前多圍繞RC梁開展,由于拱結(jié)構(gòu)的特殊性,對(duì)銹脹損傷作用下RC拱肋的靜力特性研究非常少�；诖朔N情況,本文運(yùn)用加速銹蝕法制作了3片銹脹損傷程度不同的圓弧拱肋構(gòu)件及1片未銹蝕構(gòu)件作對(duì)比試驗(yàn)。通過加載破壞試驗(yàn),研究了不同銹脹損傷下RC拱肋的受力特性、裂縫形成及擴(kuò)展、破壞形態(tài)及影響承載力退化的主要因素,對(duì)加載后的銹脹損傷RC構(gòu)件的裂縫發(fā)展情況做了進(jìn)一步探討,并分析了不同銹脹損傷下RC拱肋關(guān)鍵截面處的荷載—撓度、荷載—應(yīng)變關(guān)系,并對(duì)構(gòu)件的失效模式及承載力的變化規(guī)律進(jìn)行了對(duì)比。最后,本文以偏心受壓構(gòu)件的受力狀態(tài)為依據(jù),立足于現(xiàn)有計(jì)算理論,提出了銹脹損傷RC拱肋構(gòu)件承載能力的計(jì)算方法并建立了計(jì)算模型,對(duì)比本試驗(yàn)中的數(shù)據(jù)結(jié)果并做相應(yīng)分析研究。在對(duì)構(gòu)件進(jìn)行靜力特性研究時(shí),通常采用試驗(yàn)研究和理論分析相結(jié)合的方法。本文對(duì)銹脹損傷RC拱肋所做工作豐富了銹蝕構(gòu)件耐久性理論研究,為在役RC拱橋的維修加固提供了科學(xué)依據(jù)。
[Abstract]:Since the first arch bridge was born in England in Rome, with the rapid development of new materials and new technology, arch bridge has occupied a large proportion in the transportation network nowadays, especially reinforced concrete arch bridge. After many years of work, many bridges in service have been damaged to varying degrees due to the erosion of the bad environment, the influence of natural factors, the change of material properties, and so on. Statistics show that the corrosion of steel bar has become one of the main causes of damage of reinforced concrete (RC) arch bridge. At the same time, cracking damage caused by corrosion has become the key to evaluate the residual bearing capacity of corroded members. Due to the uncertainty of concrete cracking and steel corrosion of existing arch bridges, it is still a challenge to accurately evaluate the static characteristics of RC arch ribs. This paper summarizes the research situation of RC arch bridge damaged by rust expansion at home and abroad. The research on the static characteristics of corroded RC structures is mostly carried out around RC beams at present. Due to the particularity of arch structures, there is little research on the static characteristics of RC arch ribs under the action of rust expansion damage. Based on this situation, three arc-arch rib members with different damage degree of rust expansion and one non-corroded member are made by accelerated corrosion method. In this paper, the stress characteristics, crack formation and propagation, failure form and main factors affecting bearing capacity degradation of RC arch rib under different rust expansion damage are studied by loading failure test. The crack development of RC members with corrosion damage after loading is further discussed, and the load-deflection, load-strain relationship at key sections of RC arch rib under different corrosion damage is analyzed. The failure mode and bearing capacity of members are compared. Finally, on the basis of the stress state of eccentric compression members and based on the existing calculation theory, this paper puts forward the calculation method of the bearing capacity of RC arch ribbed members damaged by rust expansion and establishes the calculation model. Compare the data of this experiment and do the corresponding analysis. In the study of static characteristics of components, the method of combining experimental research with theoretical analysis is usually adopted. The work done in this paper enriches the theoretical study on the durability of corroded RC arch rib and provides a scientific basis for the maintenance and reinforcement of RC arch bridge in service.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U448.22

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本文編號(hào)：2153517