装配式钢板-混凝土地下粮仓螺栓-焊缝节点受弯承载力分析  

Bending capacity on the bolt-weld joint in an assembled composite underground silo with steel plate and concrete

作　　者：张昊[1] 周金玲[1] 谌磊 王宏恺 ZHANG Hao;ZHOU Jinling;CHEN Lei;WANG Hongkai(School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学土木工程学院,郑州450001

出　　处：《农业工程学报》2024年第6期212-219,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：河南省科技攻关项目(242102110130);河南省教育厅自然科学项目(21A560007)。

摘　　要：装配式钢板-混凝土组合地下粮仓具有节约土地、节能减碳、绿色环保、密闭低温等优点,但是连接节点的结构形式和力学性能仍是制约其发展及推广应用的关键难题之一。为解决节点焊缝过多、施焊难度大等问题,该研究提出一种新型装配式钢板-混凝土组合地下粮仓螺栓-焊缝竖向节点,采用螺栓代替部分焊缝,减少焊缝长度、方便构件施工。依据规范要求及实际工程情况,设计了2种不同螺栓数量(单侧三螺栓连接和单侧五螺栓连接)的螺栓-焊缝竖向节点试件,利用四点弯曲试验与有限元数值分析,研究其破坏形态和受弯承载力性能。结果表明:三螺栓试件与五螺栓试件承载力的试验值分别为1998、2053 kN,两试件承载力基本相同;相较于五螺栓试件,三螺栓试件在破坏后具有更好的延性。在参数取值范围内,混凝土强度、内防水钢板厚度、外防水钢板厚度和内衬钢板厚度对峰值荷载回归得到的标准化系数(Beta)分别为0.993、-0.003、-0.012、0.056,表明增加混凝土强度可有效提高试件承载能力。研究成果可为装配式钢板-混凝土地下粮仓节点的设计提供科学参考和设计依据。An underground grain silo with assembled steel plate-concrete composite is characterized by land and energy saving,carbon reduction,green environmental protection,airtight and low temperature.The connection joint is one of the most critical parts of the assembled structure.Structural form and mechanical properties have restricted the development,popularization,and application of underground assembled composite structures.All-welded joints are currently used in underground silos,leading to the weld challenging with numerous weld seams.In this study,a type of bolt-weld vertical joint was proposed for the assembled composite underground silo with steel plate-concrete composite.The bolts were also used to replace the portion of the weld.The length of the weld was then reduced to easily position the members.Both bolts and welds were used to connect the assembled parts of concrete,internal steel plate,external waterproof steel plate,and internal waterproof steel plate.Two specimens of bolt-weld vertical joints were designed:A single-sided three-and five-bolt specimen.Two-point symmetric loading tests were carried out to determine the bending performance of steel plate-concrete composite plates.A systematic analysis was made of the failure pattern and bearing capacity of specimens.The results indicate that the single-sided three-and five-bolt specimens shared similar bearing capacities of 1998 and 2053 kN,respectively.The load-displacement curves showed that the single-sided five-bolt specimen was much more susceptible to the brittle damage,whereas,the single-sided three-bolt specimen exhibited better ductility after failure.Therefore,a three-bolt joint was recommended to design the joint in a practical project.A finite element model of assembled underground grain silo joint was then established to derive the bearing capacity.The relative error of the overall average on deflection finite element and test strain for SC-3 was 4.17%,indicating agreement with the excellent numerical and experimental one.A parameter study wa

关 键 词：地下粮仓 受弯性能 有限元分析 参数分析 螺栓-焊缝节点 

分 类 号：TU28[建筑科学—建筑设计及理论]