方钢约束混凝土拱架套管节点抗弯性能研究  

Study on bending properties of casing joint of square confined concrete arch support

作　　者：李为腾[1] 王琦[2] 李术才[2] 杨宁[1] 王新[2] 邵行 

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《中国矿业大学学报》2015年第6期1072-1083,共12页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51304125);山东省自然科学基金项目(BS2015NJ003);山东科技大学人才引进科研启动基金项目(2015RCJJ063)

摘　　要：为掌握方钢约束混凝土拱架套管节点的力学特性,分析了套管节点抗弯力学行为模式,进行了套管节点铰-刚临界转角的计算与讨论,提出了铰-刚模式判据.进行了套管节点纯弯曲数值试验,得到了套管节点典型4阶段M-Δφ全过程曲线,揭示了曲线OA阶段产生的原因及对构件抗弯性能的影响规律,掌握了套管节点的典型抗弯行为模式及基本力学性能参数;明确了原始曲率及其他参数(混凝土强度fcu,k、套管长度l、套管壁厚t、间隙δ等)对构件极限弯矩Mue、临界曲率增量Δφ0、等效抗弯刚度(Ki,Ks)等力学参数的影响规律.在此基础上指出了新型拱架套管节点参数的设计思路.In order to obtain the mechanic characteristics of casing joint on the square steel tube confined concrete supporting arch,the bending behavior pattern of casing joint was analyzed.The critical hinge-rigid switch angle was calculated and discussed,and based on which the criterion of casing joint hinge-rigid pattern was proposed.A numerical test of casing joint pure bending was carried out.The typical 4-step overall process curve of confined concrete casing joint was obtained,and the cause of OAstage of the curve and its influence on bending bearing capacity was analyzed.Also the mechanical behavior pattern and mechanical properties were obtained.At the same time the characteristics of original curvature and other different parameters（concrete strength fcu,k、length l、thickness t、gapδ,etc）on different mechanical parameters such as ultimate bending moment Mue,critical curvature increment and equivalent bending rigidity（Ki,Ks）were discussed,and the parameter design idea of casing joint on the square confined concrete（SQCC）arch was proposed.

关 键 词：方钢 约束混凝土拱架 套管节点 纯弯曲 力学特性 

分 类 号：TD353[矿业工程—矿井建设]