束合管幕结构结合缝力学性能数值分析
吉茂杰1朱科峰1周希圣1黄小平1焦伯昌2洪剑宇2柳献2吕培林3
Numerical Analysis for Mechanical Properties of Bundled Integrate Structure Joints
JI Maojie1ZHU Kefeng1ZHOU Xisheng1HUANG Xiaoping1JIAO Bochang2HONG Jianyu2LIU Xian2LYU Peilin3
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作者信息:1.上海申通地铁集团有限公司， 201102， 上海
2.同济大学土木工程学院， 200092， 上海
3.上海市城市建设设计研究总院(集团)有限公司， 200125， 上海
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Affiliation:1.Shanghai Shentong Metro Group Co., Ltd., 201102, Shanghai, China
2.School of Civil Engineering, Tongji University, 200092, Shanghai, China
3.Shanghai Urban Construction Design & Research Institute (Group) Co., Ltd., 200125, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.017
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中图分类号/CLCN:U455.4
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栏目/Col:土建工程
摘要:
［目的］U-BIT(束合管幕结构)工法可以解决传统管幕法钢管节之间无法协同工作、支护效率差等问题。而束合管幕结构结合缝的受力性能将决定束合管幕整体结构的受力性能，因此有必要研究束合管幕结合缝的力学性能和破坏机理。［方法］提出一种梁-刚性板-弹簧有限元数值模型，并与试验数据进行对比验证；分析了束合管幕结构结合缝的全过程受力机理，以及结合缝混凝土与钢管节的黏结强度、预应力张拉力大小、预应力筋位置等因素，对束合管幕结构力学性能的影响。［结果及结论］结合缝脱开、预应力筋屈服、锁扣接触及锁扣拉坏是结合缝破坏的重要性能点；增大结合缝的黏结强度能够增加结合缝脱开弯矩，降低结合缝脱开安全系数，使其安全储备有所减小；提高预应力筋的预拉力能够有效提高结合缝脱开弯矩，但无法提高结合缝的屈服弯矩和极限弯矩，且结构极限状态延性系数较低；调整预应力筋位置，使其更靠近结合缝受拉侧，能够有效提高结合缝脱开弯矩。
Abstracts:
［Objective］The U-BIT (underground bundled integrate tunnel) method can solve the problems of steel pipe sections inability in collaborative work and poor support efficiency of the traditional pipe curtain method. The mechanical properties of U-BIT joints determine those of the overall U-BIT, so it is necessary to study the mechanical properties and failure mechanism of the U-BIT joints.［Method］A beam-rigid plate-spring finite element numerical model is proposed and compared with the experimental data for verification; the full-process stress mechanism of the U-BIT joints is analyzed, as well as the influence of factors such as the bonding strength between the joint concrete and the steel pipe section, the size of the prestressed tension force, and the position of the prestressed tendons on the mechanical properties of U-BIT joints.［Result & Conclusion］The joint separation, prestressed tendon yielding, lock contact and lock failure are important performance points in joint failure; increasing the bonding strength of the joint can increase its separation bending moment, reduce the joint separation safety factor, lowering its safety reserve to some extent. Increasing the pretension of the prestressed tendon can effectively improve the joint separation bending moment, but cannot increase the yield bending moment and ultimate bending moment of the joint, and the ductility coefficient of the structure in limit state is relatively low. Adjusting the position of the prestressed tendon to make it closer to the joint tensile side can effectively increase joint separation bending moment.
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