高强混凝土管片接头偏心受压破坏形态的研究  

Investigations for Fracture Patterns of Concrete Segmental Joints under Eccentric Compression Loadings

作　　者：李守巨[1] 于贺 杜洪泽 LI Shouju;YU He;DU Hongze(State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Liaoning Dalian 116024, China;School of Architecture & Civil Engineering, Shenyang University of Technology, Liaoning Shenyang 110870, China)

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024 [2]沈阳工业大学建筑与土木工程学院,辽宁沈阳110870

出　　处：《安徽理工大学学报（自然科学版）》2020年第3期27-32,共6页Journal of Anhui University of Science and Technology:Natural Science

基　　金：国家重点基础研究发展计划“973”项目(2015CB057804)。

摘　　要：为了研究高强混凝土管片接头偏心受压破坏形态,设计了C60、C70和C80混凝土管片接头在轴力和弯矩共同作用下破坏过程的实验方案。研究了在不同轴压条件下,混凝土管片弯矩随挠度的变化特性。混凝土管片的破坏形态表现为,在弯矩和轴力共同作用下,管片接头受压区边缘的混凝土首先达到极限压应变,受压区的混凝土被逐渐压碎,并且会出现1~3条近似垂直管片接头于接触面的主裂缝。实验研究结果表明,管片接头的极限弯矩随轴力的增加而增加,与轴力1000kN时管片接头极限弯矩相对比,轴力2000kN时C60、C70和C80混凝土的管片接头极限弯矩分别提高了29.29%、84.10%和53.34%~78.54%。In order to investigate the fracture patterns of concrete segmental joints under the eccentric compression loadings,the experimental schemes of fracture process of concrete members were designed for C60,C70 and C80 concrete segmental joints.The characteristics of bending moment variation with the deflections of concrete segmental joint under different axial forces were investigated.The experiment results validate that under the eccentric compression loadings,the concrete on the edge of the segmental joint's compressive zone firstly reaches ultimate compression strain of concrete,and then,other concrete on compressive zone are gradually crushed;1 to 3 major fractures occurred in the contact surface approximately vertical to the segmental joint.The ultimate bending moment of concrete segmental joints increased with increasing axial force.Compared to the ultimate bending moment with 1000kN axial force,the ultimate bending moments of segment joints of C60,C70,and C80 concrete with 2000kN axial force increased by 29.29%,84.10%,and 53.34%~78.54%,respectively.

关 键 词：管片接头 破坏形态 极限弯矩 轴力 连接螺栓 

分 类 号：U455[建筑科学—桥梁与隧道工程]