基于塑性损伤的盾构隧道FRP-Key接头抗剪性能及布置方式合理性研究
发布时间：2018-09-16 20:49
【摘要】：为完善FRP-Key接头的设计思路并推广该接头在实际工程中的应用,利用混凝土材料的塑性损伤本构,建立了能够反映管片损伤情况和开裂过程的数值模型。基于已有试验数据,建立FRP-Key接头的实体精细化模型,以充分考虑接头与榫槽之间接触的不连续性。通过与试验结果的对比验证了所建模型的合理性和可行性。设计了7种不同的对称布置方式,以研究其对FRPKey接头抗剪性能的影响情况。重点分析了不同布置方式中管片-接头结构在剪力作用下的宏观破坏形式,探讨了布置方式对FRP-Key接头极限承载力的影响,初步判断并提出了一定轴力条件下不同破坏形式对应的接头布置范围及最佳布置方式应满足的条件,最后综合工程实际情况给出了FRP-Key接头的应用建议。数值分析结果表明:随着布置方式的变化,榫槽侧管片出现3种不同的破坏形式,其中与理论分析情况相符的布置方式应满足条件:3.125cd25.625c。不同布置方式对应的极限承载力存在区别,当FRP-Key接头靠近管片边缘布置时,与理论计算结果相差最大,差值为10.52%,FRP-Key接头的最佳布置范围应满足条件:3.125cd24.375c。管片-接头结构达到极限承载力时,对应的接头侧管片的竖向位移在1.6~1.7mm之间。研究结果可作为进一步探讨FRP-Key接头力学性能的参考。
[Abstract]:In order to perfect the design idea of FRP-Key joint and extend its application in practical engineering, a numerical model which can reflect the damage and cracking process of segment is established by using the plastic damage constitutive constitution of concrete material. Based on the existing experimental data, a solid refinement model of FRP-Key joints is established to fully consider the discontinuity of the contact between the joints and the tenon grooves. The rationality and feasibility of the model are verified by comparing with the experimental results. Seven different types of symmetrical arrangement were designed to study the effect on shear resistance of FRPKey joints. In this paper, the macroscopic failure modes of segment-joint structure under shear force are analyzed, and the influence of layout mode on ultimate bearing capacity of FRP-Key joint is discussed. The joint layout range corresponding to different failure forms and the conditions to be satisfied by the optimal arrangement mode under certain axial force conditions are preliminarily judged and put forward. Finally, the application suggestions of FRP-Key joint are given in the light of the actual engineering conditions. The results of numerical analysis show that with the change of arrangement mode, there are three different failure modes in the mortise and groove side segments, and the arrangement mode in accordance with the theoretical analysis should meet the condition of: 3.125cd25.625c. The ultimate bearing capacity of different layout modes is different. When the FRP-Key joint is arranged near the edge of the segment, it is the biggest difference with the theoretical calculation result, and the difference is 10.52% FRP-Key joint. The optimum layout range of the FRP-Key joint should meet the condition of: 3.125 cd24.375 c. When the ultimate bearing capacity of the segment-joint structure is reached, the vertical displacement of the joint side segment is between 1.6~1.7mm. The results can be used as a reference for further study of mechanical properties of FRP-Key joints.
【作者单位】： 天津大学建筑工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：国家重点研发计划项目(02016YFC0802403) 国家自然科学基金项目(51778412,51578371,51378342)
【分类号】：U455.43
，
本文编号：2244743
[Abstract]:In order to perfect the design idea of FRP-Key joint and extend its application in practical engineering, a numerical model which can reflect the damage and cracking process of segment is established by using the plastic damage constitutive constitution of concrete material. Based on the existing experimental data, a solid refinement model of FRP-Key joints is established to fully consider the discontinuity of the contact between the joints and the tenon grooves. The rationality and feasibility of the model are verified by comparing with the experimental results. Seven different types of symmetrical arrangement were designed to study the effect on shear resistance of FRPKey joints. In this paper, the macroscopic failure modes of segment-joint structure under shear force are analyzed, and the influence of layout mode on ultimate bearing capacity of FRP-Key joint is discussed. The joint layout range corresponding to different failure forms and the conditions to be satisfied by the optimal arrangement mode under certain axial force conditions are preliminarily judged and put forward. Finally, the application suggestions of FRP-Key joint are given in the light of the actual engineering conditions. The results of numerical analysis show that with the change of arrangement mode, there are three different failure modes in the mortise and groove side segments, and the arrangement mode in accordance with the theoretical analysis should meet the condition of: 3.125cd25.625c. The ultimate bearing capacity of different layout modes is different. When the FRP-Key joint is arranged near the edge of the segment, it is the biggest difference with the theoretical calculation result, and the difference is 10.52% FRP-Key joint. The optimum layout range of the FRP-Key joint should meet the condition of: 3.125 cd24.375 c. When the ultimate bearing capacity of the segment-joint structure is reached, the vertical displacement of the joint side segment is between 1.6~1.7mm. The results can be used as a reference for further study of mechanical properties of FRP-Key joints.
【作者单位】： 天津大学建筑工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：国家重点研发计划项目(02016YFC0802403) 国家自然科学基金项目(51778412,51578371,51378342)
【分类号】：U455.43
，
本文编号：2244743
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