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| 1 | Mesoscopic investigation on seismic performance of corroded reinforced concrete columns显示文摘In addition to the normal service loadings,engineering structures may be subjected to occasional loadings such as earthquakes,which may cause severe destruction.When the steel rebar is corroded,the damage could be more serious.To investigate the seismic performance of corroded RC columns,a three-dimensional mesoscale finite element model was established.In this approach,concrete was considered as a three-phase composite composed of aggregate,mortar matrix and interfacial transition zone(ITZ).The nonlinear spring were used to describe the bond slip between steel and concrete.The degradation of the material properties of the steel rebar and cover concrete as well as the bonding performance due to corrosion were taken into account.The rationality of the developed numerical analysis model was verified by the good agreement between the numerical results and the available experimental observation.On this basis,the effect of corrosion level,axial force ratio and shear-span ratio on the seismic performance of corroded RC columns,including lateral bearing capacity,ductility,and energy consumption,were explored and discussed.The simulation results indicate that the mesoscopic method can consider the heterogeneity of concrete,to more realistically and reasonably reflect the destruction process of structures. | Jin Liu Li Yanxi Zhang Renbo Du Xiuli | 2022 | Earthquake Engineering and Engineering Vibration2022，21，4： | 0 |
| 2 | 锈蚀钢筋混凝土框架结构的抗震韧性评估显示文摘随着时间的增长,暴露于环境中的钢筋混凝土结构会不断地发生混凝土劣化和钢筋锈蚀,一旦发生地震等灾害,将会给结构带来较大损伤。采用基于纤维梁单元的时变锈蚀损伤模型,综合考虑了钢筋混凝土的大部分潜在锈蚀损伤模式,包括钢筋截面损失和钢筋压缩屈曲效应的劣化、保护层混凝土和核心混凝土的退化、以及应变渗透效应劣化。在此基础上,对锈蚀钢筋混凝土框架结构的抗震韧性进行了评估。建立了该框架在未锈蚀状态和3种不同锈蚀程度下的OpenSees有限元模型,采用非线性静力分析,考虑腐蚀情况下结构的震前系统功能损失。并通过非线性时程分析获得地震易损性曲线,计算震后由钢筋混凝土结构损坏和相关停工时间引起的直接和间接损失。考虑了线性、三角和负指数等3种恢复函数,并根据结构的损坏程度确定了震后修复时间,计算了结构在不同地震强度和锈蚀程度下的抗震韧性。结果表明,地震强度小于0.2 g时,抗震韧性基本保持不变,地震强度超过0.2 g时,结构抗震韧性曲线随着地震强度增加呈现明显的下降趋势,当地震强度达到0.8 g时,15%锈蚀率的结构抗震韧性降低到0.51;锈蚀率低于10%时,结构抗震韧性随着锈蚀程度增大而减小,但当锈蚀程度大于10%后,结构随着锈蚀率的增加,抗震韧性曲线基本保持重合。 | 邓鹏 周锦鹏 黄频 | 2023 | 地震工程与工程振动2023，43，3： | 0 |
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