新规范型钢混凝土梁集中荷载下受剪承载力公式的可靠度  

Reliability of new code shear-capacity formula for steel reinforced concrete beams under concentrated force

作　　者：姚刚峰 YAO Gangfeng(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《四川建筑科学研究》2023年第2期26-32,共7页Sichuan Building Science

基　　金：国家自然科学基金(51578400);江苏省结构工程重点实验室开放课题(ZD2205)。

摘　　要：针对中国近年发布的《组合结构设计规范》(JGJ 138—2016)与《型钢混凝土组合结构技术规程》(JGJ 138—2001)中型钢混凝土(SRC)梁剪力计算公式的差异以及原公式数据样本的局限性,利用所收集的国内外71根受剪梁的88个有效数据,重新对中国多部规范中集中荷载下SRC梁受剪承载力公式的可靠度进行了对比分析。首先,对比了数据样本的试验值与规范计算值。结果表明:《组合结构设计规范》(JGJ 138—2016)与《型钢混凝土组合结构技术规程》(JGJ 138—2001)均比现行的《钢骨混凝土结构技术规程》(YB 9082—2006)偏安全;随着型钢和箍筋用量的增加,组合结构规范公式的安全性呈下降趋势,需要重视。其次,结合计算模式的不确定性统计信息,利用蒙特卡洛模拟方法,对240根普通SRC受剪梁进行了可靠度分析。研究发现,组合结构规范公式具有较高安全性,即使将公式按0.9进行折减,其可靠度依旧能基本满足设计需求。Considering the differences of original shear-capacity formulas for steel reinforced concrete beams between recently-issued Chinese code JGJ 138—2016 and the former code JGJ 138—2001 as well as the limitations of the test data,an in-depth comparative study was carried out on the reliabilities of codes formulas again,based on 88 valid data collected from 71 test beams.By comparing the calculated shear strength with the test results,it could be found that the Chinese code JGJ 138—2016 and JGJ 138—2001 are both safer than the Chinese code YB 9082—2006.The safety of JGJ 138—2016 formula will be reduced as the increase of the amount of section steel and stirrup.Based on the achieved statistical parameters of calculation model uncertainty,the reliability analysis of 240 SRC shear beams was carried out by Monte Carlo simulation method.The results show that the safety of JGJ 138—2016 formula is relatively higher.When the formula is multiplied by 0.9,it can still satisfy the demand of reliability basically.

关 键 词：型钢混凝土 规范 受剪承载力 可靠度 蒙特卡洛模拟 

分 类 号：TU398.9[建筑科学—结构工程]