Cold-formed steel structures are steel structure products constructed from sheets or coils using cold rolling, press brake or bending brake method. These structures are extensively employed in building construction in...Cold-formed steel structures are steel structure products constructed from sheets or coils using cold rolling, press brake or bending brake method. These structures are extensively employed in building construction industry due to their light mass, ductility by economic cold forming operations, favorable strength-to-mass ratio and other factors. The utilization of cold formed steel sections with concrete as composite can hugely reduce the construction cost. However, the use of cold formed steel members in composite concrete beams has been very limited. A comprehensive review of developments in composite beam with cold formed steel sections was introduced. It was revealed that employing cold-formed steel channel section to replace reinforcement bars in conventional reinforced concrete beam results in a significant cost reduction without reducing strength capacity. The use of composite beam consisting of cold-formed steel open or close box and filled concrete could also reduce construction cost. Lighter composite girder for bridges with cold-formed steel of U section was introduced. Moreover, types of shear connectors to provide composite action between cold-formed steel beam and concrete slab were presented. However, further studies to investigate the effects of metal decking on the behavior of composite beam with cold-formed steel section and introduction of ductile shear connectors were recommended.展开更多
为解决反复开挖道路铺设多种管线造成交通拥堵且耗费大量建设成本的难题,提出侧壁出筋叠合板式拼装综合管廊,该管廊具有吊装方便、现场支模少、节点连接可靠、整体性和防水性好等优点。基于ABAQUS大型商用软件,建立水平荷载作用下侧壁...为解决反复开挖道路铺设多种管线造成交通拥堵且耗费大量建设成本的难题,提出侧壁出筋叠合板式拼装综合管廊,该管廊具有吊装方便、现场支模少、节点连接可靠、整体性和防水性好等优点。基于ABAQUS大型商用软件,建立水平荷载作用下侧壁出筋叠合板式拼装综合管廊有限元分析模型。为验证该模型的合理性,开展侧壁出筋叠合板式拼装综合管廊中节点试验,试验结果与有限元分析结果吻合良好。在此基础上,进一步开展叠合板式拼装综合管廊双舱整体结构足尺模型的有限元参数分析,分析参数包括腋角高度和轴压比。分析结果表明:1)双舱整体结构的破坏形态均为弯曲破坏。2)所有试件的峰值承载力在200.5~298.6 k N,层间位移角在1/43~1/27。3)相比于无腋角试件,当腋角高度分别为150 mm和250 mm时,有腋试件的峰值承载力分别提高24.4%和39.7%,峰值侧移分别增加49.3%和60.1%;当轴压比从0增加到0.05、0.10时,有腋试件的峰值承载力分别提升10.3%、19.7%,但峰值侧移分别降低5.2%、18.6%。总体上,侧壁出筋叠合板式拼装综合管廊双舱整体结构具有较大的承载力和较好的变形能力。展开更多
文摘Cold-formed steel structures are steel structure products constructed from sheets or coils using cold rolling, press brake or bending brake method. These structures are extensively employed in building construction industry due to their light mass, ductility by economic cold forming operations, favorable strength-to-mass ratio and other factors. The utilization of cold formed steel sections with concrete as composite can hugely reduce the construction cost. However, the use of cold formed steel members in composite concrete beams has been very limited. A comprehensive review of developments in composite beam with cold formed steel sections was introduced. It was revealed that employing cold-formed steel channel section to replace reinforcement bars in conventional reinforced concrete beam results in a significant cost reduction without reducing strength capacity. The use of composite beam consisting of cold-formed steel open or close box and filled concrete could also reduce construction cost. Lighter composite girder for bridges with cold-formed steel of U section was introduced. Moreover, types of shear connectors to provide composite action between cold-formed steel beam and concrete slab were presented. However, further studies to investigate the effects of metal decking on the behavior of composite beam with cold-formed steel section and introduction of ductile shear connectors were recommended.
文摘为解决反复开挖道路铺设多种管线造成交通拥堵且耗费大量建设成本的难题,提出侧壁出筋叠合板式拼装综合管廊,该管廊具有吊装方便、现场支模少、节点连接可靠、整体性和防水性好等优点。基于ABAQUS大型商用软件,建立水平荷载作用下侧壁出筋叠合板式拼装综合管廊有限元分析模型。为验证该模型的合理性,开展侧壁出筋叠合板式拼装综合管廊中节点试验,试验结果与有限元分析结果吻合良好。在此基础上,进一步开展叠合板式拼装综合管廊双舱整体结构足尺模型的有限元参数分析,分析参数包括腋角高度和轴压比。分析结果表明:1)双舱整体结构的破坏形态均为弯曲破坏。2)所有试件的峰值承载力在200.5~298.6 k N,层间位移角在1/43~1/27。3)相比于无腋角试件,当腋角高度分别为150 mm和250 mm时,有腋试件的峰值承载力分别提高24.4%和39.7%,峰值侧移分别增加49.3%和60.1%;当轴压比从0增加到0.05、0.10时,有腋试件的峰值承载力分别提升10.3%、19.7%,但峰值侧移分别降低5.2%、18.6%。总体上,侧壁出筋叠合板式拼装综合管廊双舱整体结构具有较大的承载力和较好的变形能力。
