不同接触并存的管片接头力学分析

大型管片接头接缝面趋于复杂化，使得接头受力和变形也将有复杂反应。采用能模拟接头复杂特性的管片接头力学模型，对管片接头在同一接缝面上并存的2种不同接触情况进行力学分析。研究表明： 1）当外侧缝隙量适当增大时，能延缓管片接头混凝土压溃，提高接头破坏弯矩的水平，并促使破坏形式从混凝土压溃的脆性破坏向螺栓屈服的塑性破坏变化，对结构设计有利； 2）当接缝面中部夹填适当厚度的局部承压衬垫时，弯矩与转角关系曲线趋于直线形，抗弯刚度水平没有明显下降，接缝张开量也没有增大，接缝面中部区域承压始终较充分，对防水有利； 3）当同一接缝面上的2种接触的尺寸或材料选取不当时，会引起接头性能明显下降，需谨慎设计。

Mechanical Analysis of Segmental Joints with Different Contacts

As the contact surface of large segmental joints to be more complex, the stress and deformation of joints under load will also have more complex results. By using mechanical model of segmental joints which can simulate complex joint characteristics, mechanical analysis of segmental joints with two different contacts on a same joint surface is carried out, and valuable conclusions are drawn. The study results show that: (1) When the gap on side of the joint surface of segmental joints increases appropriately, the collapse of joint concrete can be delayed, the joint failure bending moment level can be increased, and the change of failure form from brittle failure of concrete crushing to plastic failure of bolt yielding can be promoted, which is beneficial to structural design. (2) When the local pressure bearing liner with appropriate thickness is filled in the middle of the joint surface, the relationship curve between bending moment and rotation angle tends to be linear, the bending rigidity level does not decrease significantly, the opening of the joint does not increase, and the pressure in the middle of the joint surface is always sufficient, which is beneficial to waterproofing. (3) Improper selection of contact size and material on a same joint surface will lead to a significant decline in joint performance, so it should be designed carefully.