Issue 37

Z. Hongping et alii, Frattura ed Integrità Strutturale, 37 (2016) 352-359; DOI: 10.3221/IGF-ESIS.37.46 352 Analysis of time-dependent reliability of degenerated reinforced concrete structure Zhang Hongping, Zhang Lili, Xia Zhengbing College of Architecture and Civil Engineering, Jiangsu City Vocational College Nantong Campus, Nantong, Jiangsu, 226006, China zhanghpingzhp@163.com A BSTRACT . Durability deterioration of structure is a highly random process. The maintenance of degenerated structure involves the calculation of the reliability of time-dependent structure. This study introduced reinforced concrete structure resistance decrease model and related statistical parameters of uncertainty, analyzed resistance decrease rules of corroded bending element of reinforced concrete structure, and finally calculated time- dependent reliability of the corroded bending element of reinforced concrete structure, aiming to provide a specific theoretical basis for the application of time-dependent reliability theory. K EYWORDS . Durability of structure; Reinforced concrete; Degeneration. I NTRODUCTION mong multiple structures, reinforced concrete structure fully integrates the characteristics of steel reinforcement and concrete and cost little; hence it has been extensively promoted in infrastructure construction of China [1]. Scholars in civil engineering field keep searching for the application of new materials and innovation of structural system and seeking breakthrough in structural disaster-resistance analysis and design [2]. However, durability and life-cycle performance degeneration of structure is an important issue concerned by civil engineering workers. But so far, research progress in this field is not considerable, which may be correlated to the involvement of multiple subjects and large difficulty [3]. Randomness of resistance of reinforced concrete structure in the initial stage of construction and attenuation of resistance under the effect of environment is important characteristics [4]. With the development of infrastructure construction in China, deep research on the problem is urgent. Material degeneration and structural aging would happen under the effects of human-made environment or natural environment during long-term application, which can weaken carrying capacity and durability of structure. However, durability of reinforced concrete structure has been ignored for a long time [5]. An investigation [6] suggested that, more than 70 billion dollars were caused because of corrosion of various structures in America in 1975, 40% of which is caused by corrosion of steel reinforcement. Besides, Britain spends about 200 thousand pounds on ocean environment corrosion every year. Japan even spends 40 billion yen on the maintenance of house structure every year. Reinforced concrete structure is frequently used in China and structural damage caused by durability has been quite serious. Steel reinforcement corrosion has been one of major reasons for the failure of reinforced concrete structure. As civil engineering in China has entered into the stage of aging, scientific detection and evaluation on such kind of structure is in urgent need. Therefore, it is of great significance to make safety evaluation of structure through predicting structural durability. A