土木工程学报  2017, Vol. 50 Issue (11): 45-56    
  结构工程 本期目录 | 过刊浏览 | 高级检索 |
基于无损检测的梁柱式木框架受火后剩余承载力研究
张晋1  廖家男1  许清风 张鸣3
1. 东南大学混凝土及预应力混凝土结构教育部重点实验室, 江苏南京 210096;
2. 上海市建筑科学研究院上海市工程结构安全重点实验室, 上海 200032;
3. 中国能源建设集团安徽省电力设计院有限公司, 安徽合肥 230601
Research on residual bearing capacity of post-beam timber frame after exposure to fire using non-destructive testing
Zhang Jin1  Liao Jianan Xu Qingfeng Zhang Ming3
1. Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China; 
2. Shanghai Key Laboratory of New Technology Research on Engineering Structure, SRIBS, Shanghai 200032, China; 
3. Anhui Electric Power Design Institute, China Energy Engineering Group Co., Ltd., Hefei 230601, China
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摘要 为利用无损检测评估木框架受火后剩余承载力,进行了两榀梁柱式木框架受火试验、阻抗仪无损检测试验以及火灾后剩余承载力试验研究,了解不同受火时间下木框架炭化速度、破坏形态和剩余承载力的变化规律,并采用ABAQUS软件对受火后木框架进行数值模拟分析,验证其极限承载力及破坏规律。研究结果表明:受火后木框架构件梁柱炭化速度相差不大,其炭化速度随受火时间的增大而减小;受火后木材材性参数与阻抗值存在一定的线性回归关系;考虑小试件强度转化为构件强度的影响因素后,受火后木框架构件材性参数亦可通过阻抗值获得;受火后木框架极限承载力明显降低,最终为梁跨中底部拉裂破坏;结合无损检测手段获得的受火后木框架构件材性参数,进行有限元模拟的结果与试验吻合,因此采用无损检测对受火后木框架剩余承载力评估是可行的。
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张晋 廖家男 许清风 张鸣
关键词 火灾试验 炭化速度 无损检测 剩余承载力    
Abstract:In order to evaluate the residual bearing capacity of post-beam timber frame after exposure to fire by using non-destructive tests (NDT), the fire resistance tests, the multi-point resistograph tests and residual bearing capacity tests of two post-beam timber frames were carried out to study the variation rules of charring rate, failure modes, and the residual bearing capacity under different time of fire exposure. The finite element software, ABAQUS, is used to analyze the bearing capacity and failure modes of post-and-beam frame, based on the wood properties by NDT. The results show that the charring rates of the wood beam is similar to that of the wood column and the charring rate decreases with the increase of exposure time to fire. There is a certain linear regression relationship between the drill resistance values and the wood properties after exposure to fire. Considering the differences between small timber specimens and realistic wood members, the performance parameter of the wood members after fire can be obtained by the drill resistance value. The ultimate bearing capacity of the post-beam timber frame after fire is obviously reduced and finally the results of the finite element simulation are in good agreement with the experimental results. So it is feasible to use the non-destructive testing to evaluate the residual bearing capacity of post-beam timber frame after fire.
Key wordsfire resistance test    charring rate    non-destructive testing    residual bearing capacity
    
引用本文:   
张晋 廖家男 许清风 张鸣 . 基于无损检测的梁柱式木框架受火后剩余承载力研究[J]. 土木工程学报, 2017, 50(11): 45-56.
Zhang Jin Liao Jianan Xu Qingfeng Zhang Ming . Research on residual bearing capacity of post-beam timber frame after exposure to fire using non-destructive testing. 土木工程学报, 2017, 50(11): 45-56.
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