闭口型压型钢板-混凝土组合楼板耐火设计实用方法  

Practical Design Method for the Fire Resistance of Closed Profiled Steel Sheeting Composite Slab

作　　者：黄永强 徐婷 

机构地区：[1]华东建筑设计研究总院,上海200002

出　　处：《建筑钢结构进展》2017年第3期74-80,共7页Progress in Steel Building Structures

摘　　要：根据《组合楼板设计与施工规范》(CECS 273:2010)简化了闭口型组合楼板混凝土内部温度分布,编制了闭口型压型钢板-混凝土组合楼板耐火承载力有限元计算程序。基于程序计算结果进行了大量数据分析,基于混凝土受弯构件的承载力理论,回归得到了耐火极限分别为1.5h和2.0h的闭口型压型钢板组合楼板耐火承载力简化公式。运用简化公式进行了算例分析,比较了温度场分布、边界及是否考虑压型钢板作用对正弯矩区配筋量的影响,供设计人员参考使用。由于被混凝土包裹的压型钢板温度场分布研究尚不充分,故分别给出了考虑和不考虑压型钢板作用这两种情况下的正弯矩承载力简化公式。Based on the requirements of Code for composite slabs design and construction（CECS273：2010）,FEM theory,and simplified concrete thermal distribution,spreadsheet calculations for fire resistance of closed profiled steel sheetingconcrete composite slabs is proposed in this paper.On the basis of flexural strength of concrete bending member,data analysis on spreadsheets utilizing linear regression is performed to set up simplified formulae respectively for 1.5-hour and 2-hour fire resistance of closed profiled steel sheeting composite slabs.Through the case studies using the simplified formula,the effect at the bottom reinforcement of steel sheeting composite slabs to thermal distribution,support restraint and inner profiled steel sheets is analyzed.The calculating results can be applied directly by designers.For the lack of reliable study on thermal distribution of steel sheeting enclosed by concrete,two independent formulas on the positive flexural strength are derived with and without considering the effect of steel sheeting covered by concrete.

关 键 词：组合楼板 闭口型压型钢板 温度场 耐火承载力 有限元 实用方法 

分 类 号：TU352.5[建筑科学—结构工程] TU375.2