[1]李俊华,刘明哲,萧 寒.火灾后型钢混凝土梁剩余承载力数值模拟分析[J].西安建筑科技大学学报:自然科学版,2013,45(04):470-478.[doi:10.15986/j.1006-7930.2013.04.003]
　LI Jun-hua,LIU Ming- zhe,XIAO Han.Numerical simulating analysis for residual load bearing capacity of steel reinforced concrete beams after exposure to fire[J].J.Xi’an Univ. of Arch. & Tech.:Natural Science Edition,2013,45(04):470-478.[doi:10.15986/j.1006-7930.2013.04.003]
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火灾后型钢混凝土梁剩余承载力数值模拟分析()
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西安建筑科技大学学报:自然科学版[ISSN:1006-7930/CN:61-1295/TU]

卷:
45
期数:
2013年04期
页码:
470-478
栏目:
出版日期:
2013-08-31

文章信息/Info

Title:
Numerical simulating analysis for residual load bearing capacity of steel reinforced concrete beams after exposure to fire
文章编号:
1006-7930(2013)04-0470-09
作者:
李俊华; 刘明哲; 萧 寒
(宁波大学建筑工程与环境学院,浙江 宁波 315211)
Author(s):
LI Jun-hua ; LIU Ming- zhe;  XIAO Han
(School of Civil Engineering and Environment, Ningbo University, Ningbo 315211, China)
关键词:
火灾后; 型钢混凝土梁; 温度场; 剩余承载力; 数值模拟
Keywords:
post-fire;  steel reinforced concrete beams;  temperature field;  residual load bearing capacity;  numerical simulation
分类号:
TU 398.9
DOI:
10.15986/j.1006-7930.2013.04.003
文献标志码:
A
摘要:
利用ANSYS程序对火灾后型钢混凝土梁的截面温度场及剩余承载力进行了模拟分析,数值分析结果得到了试验验证.考虑混凝土强度、剪跨比、含钢率、受火时间等参数,利用ANSYS程序对ISO834标准火灾作用后型钢混凝土梁剩余承载力进行了进一步计算.计算结果表明,经历ISO834标准火灾作用后,型钢混凝土梁的极限承载力显著降低,在参数范围内,承载力降低幅度在8.1%~30.5%之间变化.定义火灾作用后型钢混凝土梁剩余承载力与常温下型钢混凝土梁极限承载力的比值k为火灾后型钢混凝土梁剩余承载力影响系数.数值模拟分析结果表明剪跨比、截面含钢率、受火时间对k值的影响较大.在数值计算结果基础上,通过回归分析的方法得到了火灾后型钢混凝土梁剩余承载力影响系数k的简化计算公式,公式计算结果与数值模拟分析结果符合较好.
Abstract:
Numerical simulating analysis on the sectional temperature field and residual load bearing capacity of steel reinforced concrete beams after exposure to fire is carried out by using element analysis software ANSYS. The simulating results prove to be correct by test results. Then, the influence of such parameters, as concrete strength, shear span ratio, steel ratio and temperature elevating time on residual load bearing capacity of steel reinforced concrete beams after exposure to ISO834standard fire is studied by using ANSYS. Numerical simulating results show that the ultimate strength of steel reinforced concrete beams after exposure to ISO834standard fire decrease remarkably as compared with that at normal room temperature. The decreasing degree ranged between 8.1% and 30.5%in the parameters designed in this paper. The ratio of residual strength after exposure to fire to ultimate strength at normal room temperature of steel reinforced concrete beams is defined as residual load bearing capacity influence coefficient k. Results from numerical simulation show that shear span ratio, steel ratio, and temperature elevating time all have remarkable influence on k. The simplified calculating formula for k is put forward by regression method on the basis of numerical simulation results, and the calculating results from formula are shown to be in agreement with the results from numerical simulation

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备注/Memo

备注/Memo:
收稿日期:2013-- 修改稿日期:2013--
基金项目:国家自然科学基金项目(51178226);宁波市自然科学基金项目(2010A610079);宁波大学近海冲击与安全工程省重中之重学科项目(zj1017)
作者简介:李俊华(1977-),男,湖南安仁人,教授,博士,主要从事钢与混凝土组合结构及结构抗火方面研究.
更新日期/Last Update: 2015-10-05