火灾下四面受火钢筋混凝土柱极限承载力的简化计算

目前,对钢筋混凝土结构构件的高温承载力确定一般都根据截面尺寸和钢筋保护层厚度等因素查询相关表格计算或进行有限元分析,不便于工程设计人员使用。本文给出了一种计算四面受火钢筋混凝土柱极限承载力的简化计算方法,该方法参考国外最新研究成果,不必对截面的温度场进行分析,也不要查询相关计算表格,直接在计算公式中考虑影响因素对材料性能的折减,计算方法和过程与常温下相似。将计算结果和39根柱的实验结论进行比较的结果表明,该方法计算精度较高且偏于安全。通过一个计算实例展示其应用。该方法计算过程简单,并和规范相结合,能够满足工程设计人员使用要求。

Simplified Calculation of Ultimate Bearing Capacity of Four-Face Heated Reinforced Concrete Columns in Fire

Currently,the determination of the fire resistance of concrete columns is essentially based on table containing the dimensions of the cross section and values of the concrete cover or finite element analysis method,which unsatisfies the engineers for a quick and efficient design.A simplified method for calculating the ultimate load bearing capacity of four-face heated reinforced concrete columns is presented in this paper,which referenced foreign latest information.With this method,we need neither to analysis the temperature filed of the section advanced nor to query any table,and just consider the influence parameter in the design formulas directly.The accuracy of the method is verified through a set of experimental test results comprising 39 columns.The method yields reasonably accurate predictions for the fire resistance of RC columns.In addition,the paper includes an example to illustrate the use of the formula.This method can be used by engineers for its simplicity,practicality and yet associated with the current code.