在役钢筋混凝土渡槽时变模糊可靠度分析
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摘要
为了更合理地评价渡槽结构在使用过程中安全性能随时间变化的情况,基于在役钢筋混凝土渡槽结构,考虑时间因素,并考虑混凝土碳化引起结构耐久性下降因素的随机性与模糊性,以渡槽结构混凝土碳化深度为基本控制参数,利用一次二阶矩法,建立了混凝土碳化深度随时间变化的时变模糊可靠度模型,运用MATLAB编制相应的程序,针对工程实例进行计算分析。计算结果表明:考虑时间因素,可以较好地反映渡槽结构随时间变化的动态可靠性指标,便于更加准确地掌握渡槽的检修时间;在以时间为因素的基础上,考虑变量的随机性与模糊性所得到的解比经典可靠度解偏小,这与实际工程相符,更加接近于工程真实情况,可为工程设计和后期维修提供更多的参考信息。
In order to evaluate the time-dependent safety performance of aqueduct structure during operation more reasonably, a time-dependent fuzzy reliability model for the time-varying concrete carbonation depth is established with the first-order second-moment method by taking the concrete carbonation depth of aqueduct as the basic control parameter under the considerations of the time factor and both the randomness and the fuzziness of the factor of the structure durability decrease caused by the concrete carbonation on the basis of the structure of in-service reinforced concrete aqueduct, and then the relevant calculation and analysis on engineering case are carried out with the corresponding program made with MATLAB. The calculation result shows that the time-dependent dynamic reliability index of the aqueduct structure can be better reflected under the consideration of time factor, which is convenient for more correctly grasping the maintenance time.On the basis of considering the time factor, the solution obtained by considering the randomness and fuzziness of variable is a little bit less than the classical reliability solution, which is consistent with that from the actual project and more close to the real engineering situation, thus can provide more referential information for the engineering design and the late maintenance.
In order to evaluate the time-dependent safety performance of aqueduct structure during operation more reasonably, a time-dependent fuzzy reliability model for the time-varying concrete carbonation depth is established with the first-order second-moment method by taking the concrete carbonation depth of aqueduct as the basic control parameter under the considerations of the time factor and both the randomness and the fuzziness of the factor of the structure durability decrease caused by the concrete carbonation on the basis of the structure of in-service reinforced concrete aqueduct, and then the relevant calculation and analysis on engineering case are carried out with the corresponding program made with MATLAB. The calculation result shows that the time-dependent dynamic reliability index of the aqueduct structure can be better reflected under the consideration of time factor, which is convenient for more correctly grasping the maintenance time.On the basis of considering the time factor, the solution obtained by considering the randomness and fuzziness of variable is a little bit less than the classical reliability solution, which is consistent with that from the actual project and more close to the real engineering situation, thus can provide more referential information for the engineering design and the late maintenance.
引文
[1] 张俊芝, 李桂青. 服役结构时变可靠度的近似计算[C]// 全国工程结构可靠性学术会议. 2002.
[2] 潘洪科, 边亚东, 杨林德. 钢筋混凝土结构基于耐久性劣化度的可靠性分析[J]. 建筑结构学报, 2011, 32(1):105- 109.
[3] 张璐, 施养杭. 钢筋锈蚀后混凝土耐久性的模糊可靠度分析[J]. 华侨大学学报(自然版), 2007, 28(1):71- 74.
[4] 冯云芬, 贡金鑫, 杨国平, 等. 钢筋锈蚀率的概率模型及时变可靠度分析[J]. 水利水运工程学报, 2014(1):24- 32.
[5] 耿欧, 袁迎曙, 蒋建华, 等. 混凝土中钢筋锈蚀速率的时变模型[J]. 东南大学学报(自然科学版), 2010, 40(6):1293- 1297.
[6] 郑怡, 刘明, 沈小俊, 等. 既有钢筋混凝土梁时变可靠度计算模型[J]. 交通运输工程学报, 2009(2):45- 49.
[7] SUAREZ F J, BRAVO R. Historical and probabilistic structural analysis of the Royal ditch aqueduct in the Alhambra(Granada)[J]. Journal of Cultural Heritage, 2014, 15(5):499- 510.
[8] 解伟, 陈爱玖, 李树山, 等. 涵洞式渡槽可靠度分析[J]. 灌溉排水学报, 2006(4):90- 92.
[9] 王盛,吴剑国,张爱晖.渡槽结构系统可靠度分析[J].中国农村水利水电,2005(2):72- 74.
[10] HUANG P, YAO W, PENG H, et al. Seismic Response Analysis of Horizontal in Nilka Ditch Aqueduct[C]// International Conference on System Science, 2010.
[11] 赵国藩. 结构可靠度理论[M]. 北京:中国建筑工业出版社, 2000.
[12] 杨纶标, 高英仪, 凌卫新. 模糊数学原理及应用:第5版[M]. 广州: 华南理工大学出版社, 2011.
[13] 牛荻涛, 石玉钗, 雷怡生. 混凝土碳化的概率模型及碳化可靠性分析[J]. 西安建筑科技大学学报(自然科学版), 1995(3):252- 256.
[14] 潘洪科. 基于碳化作用的地下工程结构的耐久性与可靠度[D]. 上海:同济大学, 2005.
[2] 潘洪科, 边亚东, 杨林德. 钢筋混凝土结构基于耐久性劣化度的可靠性分析[J]. 建筑结构学报, 2011, 32(1):105- 109.
[3] 张璐, 施养杭. 钢筋锈蚀后混凝土耐久性的模糊可靠度分析[J]. 华侨大学学报(自然版), 2007, 28(1):71- 74.
[4] 冯云芬, 贡金鑫, 杨国平, 等. 钢筋锈蚀率的概率模型及时变可靠度分析[J]. 水利水运工程学报, 2014(1):24- 32.
[5] 耿欧, 袁迎曙, 蒋建华, 等. 混凝土中钢筋锈蚀速率的时变模型[J]. 东南大学学报(自然科学版), 2010, 40(6):1293- 1297.
[6] 郑怡, 刘明, 沈小俊, 等. 既有钢筋混凝土梁时变可靠度计算模型[J]. 交通运输工程学报, 2009(2):45- 49.
[7] SUAREZ F J, BRAVO R. Historical and probabilistic structural analysis of the Royal ditch aqueduct in the Alhambra(Granada)[J]. Journal of Cultural Heritage, 2014, 15(5):499- 510.
[8] 解伟, 陈爱玖, 李树山, 等. 涵洞式渡槽可靠度分析[J]. 灌溉排水学报, 2006(4):90- 92.
[9] 王盛,吴剑国,张爱晖.渡槽结构系统可靠度分析[J].中国农村水利水电,2005(2):72- 74.
[10] HUANG P, YAO W, PENG H, et al. Seismic Response Analysis of Horizontal in Nilka Ditch Aqueduct[C]// International Conference on System Science, 2010.
[11] 赵国藩. 结构可靠度理论[M]. 北京:中国建筑工业出版社, 2000.
[12] 杨纶标, 高英仪, 凌卫新. 模糊数学原理及应用:第5版[M]. 广州: 华南理工大学出版社, 2011.
[13] 牛荻涛, 石玉钗, 雷怡生. 混凝土碳化的概率模型及碳化可靠性分析[J]. 西安建筑科技大学学报(自然科学版), 1995(3):252- 256.
[14] 潘洪科. 基于碳化作用的地下工程结构的耐久性与可靠度[D]. 上海:同济大学, 2005.