摘要
该文以经典的库仑破坏、主拉应力破坏和主压应力破坏理论为基础,引入模糊数学中模糊理论,首次提出将砌体在剪压复合作用下的剪摩、剪压和斜压三类破坏划分为两个破坏区,即剪摩-剪压破坏区和剪压-斜压破坏区。运用权函数将对应于不同破坏形态的经典破坏理论有机地结合起来,推导出相应的砌体在剪压复合作用下的抗剪强度公式,并加以简化。经对比表明,计算曲线与试验结果吻合良好。同时,针对现行《砌体结构设计规范》和《建筑抗震设计规范》中关于砌体抗剪强度设计值计算上存在的一些问题,提出了基于上述破坏区理论的砌体静力与抗震抗剪强度设计值公式。计算结果表明,该公式不仅简单,偏于安全,且较现行规范公式有较大的改进,能直接应用于高层砌体结构设计。
Based on the classic Coluomb friction law, the maximum tensile stress criterion, the maximum compressive stress criterion and the fuzzy theory of fuzzy mathematics, the paper puts forward for the first time that the three kinds of masonry failure models called shear-friction, shear-compression and diagonal compression models under the shear-compression loading, which can be divided into two failure regions, namely the shear-friction and shear-compression failure region as well as the shear-compression and diagonal compression failure region. By adopting the weight function to combine the classic failure theory with the corresponding failure model, the paper presents the formula of the shear strength of masonry and simplifies it. The results of contrast indicate that the calculated curves are in good agreement with experimental results. Meanwhile, in the view point of some questions existing in ＇Code for design of masonry structures＇ and ＇Code for seismic design of building structures＇, the paper puts forward the design formulae of the static and seismic shear strength of masonry based on failure region theory. The computed results indicate that the formulae are not only simple and Safe, but also improve the formulae of current design codes and can be used to design tall masonry structures.
出处
《工程力学》
EI
CSCD
北大核心
2008年第4期158-164,共7页
Engineering Mechanics
基金
国家自然科学基金项目(50608031)
关键词
砌体
抗剪强度
剪压复合作用
模糊理论
权函数
masonry
shear strength
shear-compression loading
fuzzy theory
weight function
