摘要
为研究螺栓-钢填板连接的胶合木梁柱框架结构的抗连续倒塌性能,制作4组采用不同节点的平面双跨梁柱子结构,包括普通节点以及增设自攻螺丝、后期受力螺栓和钢抗拉构件等3种改进节点,并开展静力连续倒塌试验,研究子结构的破坏模式、抗力机制以及节点对其抗连续倒塌性能的影响。结果表明:普通节点的子结构的劈裂裂缝贯穿全梁,节点发生劈裂、列剪和受拉的复合破坏,而采用改进节点的子结构破坏程度均有所减轻;子结构主要通过梁的弯曲、压拱和悬链线机制抵抗荷载;采用改进节点的子结构承载力提高32%~159%,且其压拱与悬链线阶段承载力也分别最大提高45%和197%;采用改进节点均能促进子结构的压拱机制发展,而增设自攻螺丝节点的子结构的悬链线阶段变形能力更优。
To investigate the progressive collapse resistance of glulam post-and-beam frames connected with bolts and steel plates,static progressive collapse tests were conducted on four groups of 2D double-span glulam substructures with various connections.These included a conventional connection and three improved ones reinforced with self-tapping screws,supplemental bolts and hold-downs.The study focused on the failure modes,resistance mechanisms,and influence of connections on the progressive collapse resistance of substructures.The results indicate that the substructure with conventional connections presents splitting cracks along the beam,and the connections fail in a combined mode involving splitting,plug shear and tensile failure.In contrast,substructures with improved connections sustain less severe damage,as the load is mainly resisted through beam bending and thus primarily shifted to compressive arch action(CAA),and catenary action(CA).The improved connections dramatically increase the substructures'bearing capacity by 32%~159% and significantly enhance their resistance in the CAA and CA stages by up to 45%and 197%,respectively.All improved connections facilitate the development of the CAA stage in the substructures,while the substructures with self-tapping screw connections demonstrate better deformation capacity in the CA stage.
作者
赵雪冰
唐践扬
宋晓滨
ZHAO Xuebing;TANG Jianyang;SONG Xiaobin(Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education,Tongji University,Shanghai 200092,China;Department of Structural Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构学报》
北大核心
2025年第11期46-54,共9页
Journal of Building Structures
基金
国家自然科学基金项目(52178243)。
关键词
胶合木
梁柱框架结构
螺栓-钢填板连接
静力试验
倒塌抗力机制
glulam
post-and-beam frame
bolted connection with steel plate
static test
collapse resistance mechanism
