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A Performance Estimation Method for Exsiting Concrete Components Based on Measured Prestress Values
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摘要: 为了提出既有预应力混凝土构件考虑有效预应力分布的性能评定方法,揭示有效预应力抽样检测值与预应力混凝土结构性能分析特征参数的映射关系,验证预应力混凝土结构有效预应力基于高斯混合统一概率模型的总体分布规律。在实测有效预应力值样本数据的基础上,基于统一概率模型采用特征加权法和最大期望算法(EM)等概率统计方法,提取有效预应力分布典型特征,并引入95%保证率条件下的承载力特征值对结构服役性能进行定量计算,提出了一种基于实测样本数据的既有预应力混凝土构件性能推定方法。以某无黏结预应力混凝土结构为工程实例,使用设计复核法与特征值法分别评价结构服役性能。研究表明,与现行评价方法相比,特征值法能较好地拟合实际情况,且能够有效地保证结构的安全性和可靠性,可为既有预应力混凝土结构的性能评价和加固设计提供参考依据。Abstract: In order to put forward a performance evaluation method for existing prestressed concrete members considering the distribution of effective prestress, reveal the mapping relationship between the sampling test values of effective prestress and the characteristic parameters of the performance analysis of prestressed concrete structures, and verify the overall distribution law of effective prestress of prestressed concrete structures based on Gaussian mixture unified probability model, based on the sample data of the measured effective prestress values, the typical characteristics of the effective prestress distribution are extracted by the probabilistic and statistical methods such as feature weighting method and maximum expectation algorithm (EM) based on the unified probability model, and the characteristic value of the bearing capacity under the condition of 95% guarantee rate was introduced for quantitative calculation of the service performance of the structure. A method for predicting the performance of existing prestressed concrete members based on measured sample data was proposed. Taking an unbonded prestressed concrete structure as an engineering example, design review method and eigenvalue method were used to evaluate the service performance of the structure respectively. The results showed that compared with the existing evaluation methods, the eigenvalue method could better fit the actual situation and effectively ensure the safety and reliability of the structure, so as to provide a reference for the performance evaluation and reinforcement design of the existing prestressed concrete structures.
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[1] BONOPERA M,CHANG K, LEE Z. State-of-the-art review on determining prestress losses in prestressed concrete girders[J]. Applied Sciences, 2020, 10(20),7257. [2] 戎芹, 王旭, 侯晓萌,等.预应力混凝土结构钢绞线有效应力测量与评估方法[J]. 建筑结构学报,2020, 41(8):176-182. [3] 施秀山,杨海洋,杨文彬.基于预应力损失对主梁挠度的影响分析[J].中国水运(下半月),2022,22(5):129-131. [4] 赵绪满,张世辉,帅一丁.预应力损失对大跨度混凝土连续梁挠度的影响研究[J].铁道标准设计,2011(增刊1):80-82. [5] 中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB 50010—2010[S]. 北京:中国建筑工业出版社,2015. [6] 中华人民共和国交通运输部.公路钢筋混凝土及预应力混凝土桥涵设计规范:JTG 3362—2018[S].北京:人民交通出版社,2018. [7] 赵煜,贺拴海,李春风,等.在役预应力混凝土箱梁开裂后承载力评估[J].同济大学学报(自然科学版),2010,38(9):1271-1275. [8] 胡少伟,喻江,陆俊,等.大跨度预应力混凝土空心面板服役性态安全评价[J].水利水电技术,2018,49(6):148-155. [9] 程寿山,李兴庆,于刚勤,等.预应力连续梁桥预应力损失预测及测试方法研究[J].公路交通科技,2006(增刊1):71-73. [10] 李瑞鸽,张耀庭,邹冰川.基于正交异性材料的预应力梁频率的试验研究[J].工程力学,2008(2):116-121. [11] 刘永淼. 环孔法测试混凝土工作应力试验研究[D].杭州:浙江大学,2006. [12] 刘志勇.有损伤预应力混凝土T梁静载试验和有效预应力检测方法[D].石家庄:石家庄铁道大学,2014. [13] 许庆,曾滨,徐晓达,等.基于高斯混合模型的混凝土结构预应力分布特征及估计方法[J].建筑结构学报,2022,43(10):60-67. [14] 王甲春,杨明松,吴鸿枫,等.基于概率分析的普通混凝土抗压强度等级评定[J].厦门理工学院学报,2021,29(1):61-67. [15] 王浩,牟宗龙,易恩兵,等.基于正态分布置信区间分析法求岩石单轴抗压强度[J].煤炭科学技术,2013,41(4):13-15. [16] BRIAN L M, YARIV E. An EM algorithm for continuous-time bivariate Markov chains[J]. Computational Statistics & Data Analysis, 2013, 57: 504-517. [17] 傅旭东,赵善锐.用蒙特卡洛(Monte-Carlo)方法计算岩土工程的可靠度指标[J].西南交通大学学报,1996(2):164-168. [18] 王景梅,肖芳,陈家俊,等.基于贝叶斯理论和蒙特卡洛模拟的桩基可靠度分析[J].地下空间与工程学报,2017,13(增刊1):85-90. [19] 中华人民共和国住房和城乡建设部. 建筑结构检测技术标准:GB/T 50344—2019[S]. 北京:中国建筑工业出版社,2019. [20] 中华人民共和国建设部.无粘结预应力混凝土结构技术规程:JGJ 92—2004 [S]. 北京:中国建筑工业出版社,2005. [21] 扎卡里(Mahamadou Djibo Zakari). 预应力混凝土结构承载能力计算的等效荷载法[D].南京:东南大学,2021. -
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