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既有建筑砌体抗压强度的贝叶斯推断

2021-09-13倪玉双蒋耀华杨春侠

土木建筑与环境工程 2021年6期

倪玉双 蒋耀华 杨春侠

摘 要:基于贝叶斯理论推断既有建筑砌体抗压强度,将现场原位轴压法测试的砌体抗压强度作为先验信息,同时利用块体和砂浆回弹法检测强度的推定值,按照《砌体结构设计规范》(GB 50003—2011)中的砌体抗压强度计算公式构造似然函数,联合先验信息和似然函数,推导既有建筑砌体抗压强度的后验分布,研究结果表明:通过后验分布可得到综合各种信息的既有建筑砌体抗压强度的合理推断值。且已建立的后验分布可作为下一次抗压强度贝叶斯推断的先验信息,可实现既有建筑砌体抗压强度值的动态长期观测,为砌体结构的定期维修和加固提供依据,为砌体结构的可持续发展提供基础。

关键词:既有建筑;砌体抗压强度;贝叶斯推断;先验信息;似然函数;后验分布

中图分类号:TU362 文献标志码:A 文章编号:2096-6717(2021)06-0082-06

Abstract: Based on Bayesian theory, the compressive strength of existing masonry structure was deduced.The compressive strength of masonry tested by the method of axial compression in situ was taken as a prior information. At the same time, the estimated value of strength of block and mortar detected by the rebound method was used to construct the likelihood function, according to the calculation formula of compressive strength of masonry in the "Code for Design of Masonry Structures" (GB 50003-2011).Combining the prior information and the likelihood function, the posterior distribution of compressive strength of existing building masonry was derived.The research results show that the reasonable inferred values of compressive strength of existing masonry structures containing various information can be obtained through the posterior distribution. Moreover, the established posterior distribution can be used as the prior information for subsequent compressive strength Bayesian reference, which can realize the dynamic long-term observation of compressive strength of existing masonry structure.Furthermore,it provides a basis for the regular maintenance and reinforcement of existing masonry structure, and provides a foundation for the sustainable development of existing masonry structure.

Keywords: existing structure; compressive strength of masonry; Bayesian inference; prior information;likelihood function; posterior distribution

“可持續发展”越来越成为各类工程结构发展的主题,根据《工程结构可靠性设计统一标准》(GB 50153—2008),《建筑结构可靠性设计统一标准》(GB 50068—2018)修订中增加了“使结构符合可持续发展的要求”。对于建筑结构而言,可持续发展在社会方面的内容就是要保证使用者的健康和舒适,保护建筑工程的文化价值[1]。

砌体结构是一种重要的建筑结构形式,在中国有大量的既有砌体结构,包括大量的砌体古建筑,古建筑作为凝固的艺术,承载着大量而丰富的历史信息,保护这些既有砌体结构具有重要的意义。而这些既有砌体结构在不同程度上需要定期的维修和加固,维修加固通常需要通过调查检测、结构试验获得相关强度数据来进行分析,砌体的抗压强度就是一个非常重要的强度指标。……

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