标准火灾下胶合木梁柱螺栓节点的承载力设计方法  

Design method for the fire resistance of glulam bolted connections under standard fire exposure

作　　者：罗晶 何敏娟[2] 李征[2] 郑修知 Luo Jing;He Minjuan;Li Zheng;Zheng Xiuzhi(School of Civil Engineering,Shanghai Normal University,Shanghai 201400,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]上海师范大学建筑工程学院,上海201400 [2]同济大学土木工程学院,上海200092

出　　处：《东南大学学报（自然科学版）》2024年第6期1472-1480,共9页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52308268);上海市青年科技英才扬帆计划资助项目(23YF1430900);上海市浦江人才计划资助项目(23PJ1414100)。

摘　　要：为了研究木结构螺栓节点抗火性能设计方法,开展了胶合木结构梁柱钢填板螺栓节点的标准火灾试验,获得了节点在恒载下的耐火时间.基于梁柱螺栓节点抗火试验数据和近30年国内外不同类型的销轴类连接节点抗火试验数据建立了数据库,利用该数据库研究了持荷比与耐火时间关系公式,并用试验结果对公式的准确性进行对比分析.针对试验节点,提出了弯剪耦合下胶合木梁柱螺栓节点计算方法.研究表明,在已知持荷比下计算所得的节点理论耐火时间与试验结果较接近,且本试验节点的耐火时间理论值小于试验值,最大误差为-11.34%.这说明理论值偏保守,可为木结构节点抗火设计留有一定安全余量.To explore fire resistance design methods for bolted connections in timber structures,standard fire tests were conducted on glulam bolted beam-column connections with inserted-in steel plates,and the fire resistance time of the connections under constant load was obtained.A database was developed using fire test data from beam-column bolted connections,as well as fire test data from various dowel-type connections gathered over the past 30 years worldwide.Based on this database,some formulas relating load ratio to fire resistance time were derived,and their accuracy was validated by comparing the theoretical results with experimental data.Additionally,a method for calculating the fire resistance of glulam beam-column bolted connections under combined bending and shear was proposed.The findings indicate that,for a given load ratio,the calculated theoretical fire resistance time closely aligns with the experimental results.The theoretical values are slightly lower than the experimental results,with a maximum error of-11.34%.The conservative nature of the theoretical results provides a safety margin for the fire resistance design of timber connections.

关 键 词：木结构 梁柱节点 抗火承载力 计算方法 

分 类 号：TU366.2[建筑科学—结构工程]