对《砌体结构设计规范》中高厚比修正系数等问题的探讨  

Discussion on the Correction Coefficient of Height-to-thickness Ratio in the Code for Design of Masonry Structures

作　　者：汪冬生 WANG Dongsheng(Nanjing Nanda Engineering Testing Co.,Ltd,Nanjing Jiangsu 210002 China)

机构地区：[1]南京南大工程检测有限公司,江苏南京210002

出　　处：《江苏建筑》2024年第3期45-48,58,共5页Jiangsu Construction

摘　　要：文章指出了《砌体结构设计规范》(GB 50003—2011)中关于带门窗洞口砌体墙允许高厚比的修正系数μ2的计算精度不足,并根据弹性稳定理论,提出了两端铰接变截面柱临界荷载Pcr的正确表达式,通过理论计算和有限元模拟对其给予了证明,此外,还推导了门窗洞口最不利布置时的μ2表达式。在此基础上,提出了比《砌体结构设计规范》(GB 50003—2011)更合理的有洞口墙体的允许高厚比修正系数μ2计算公式,同时对μ2的相关应用细则提出了修正建议。以修正后的两端铰接柱临界荷载Pcr为基础,提出了规范中变截面柱下段计算长度H0的更合理形式,为便于工程应用,最后对规范中有吊车房屋变截面柱计算长度的应用条款提出了修改建议。This paper indicates that the calculation accuracy of the correction coefficientμ2 for the allowable height-thickness ratio of masonry walls with doors and windows in the Code for Design of Masonry Structures(GB 50003—2011)is insufficient.According to the elastic stability theory,the correct expression of critical load Pcr of hinged variable cross-section columns at both ends is put forward,which is proved by theoretical calculation and finite element simulation.In addition,theμ2 expression of the most unfavorable arrangement of doors and windows is derived.On this basis,a more reasonable formula for calculating the allowable height-to-thickness ratio correction coefficientμ2 of perforated walls is put forward,which is more reasonable than the Code for Design of Masonry Structures(GB 50003—2011).At the same time,suggestions for amending the relevant application rules ofμ2 are put forward.Based on the revised critical load Pcr of hinged columns at both ends,a more reasonable form of calculated length H0 of variable cross-section columns in the code is put forward.In order to facilitate engineering application,suggestions are put forward to modify the application provisions of variable cross-section columns of crane buildings in the code.

关 键 词：有洞口砌体墙 两端铰接变截面柱 临界荷载 允许高厚比修正系数 计算长度 

分 类 号：TU311[建筑科学—结构工程]