预制预应力综合管廊受力性能试验研究  

Experimental study of mechanical properties of PPMT

作　　者：胡翔[1] 薛伟辰[1] 

机构地区：[1]同济大学,上海200092

出　　处：《土木工程学报》2010年第5期29-37,共9页China Civil Engineering Journal

基　　金：国家"十一五"科技支撑计划重点课题(2006BAJ16B07)

摘　　要：以2010年上海世博会园区综合管廊工程为背景,通过接头和整体结构足尺模型的单调静力试验,对采用预应力筋连接的预制预应力综合管廊的受力性能进行了较为系统的研究。接头试验研究结果表明:采用预应力筋连接的预制预应力综合管廊接头的受力过程分为消压、屈服和极限破坏三个阶段;破坏形态为预应力筋首先屈服,随后受压区混凝土压碎;破坏机制为桁架机制;接头抗弯承载力为设计弯矩的2.1倍,抗弯刚度随外荷载的增大而减小;接头试件的位移延性系数达到2.8,接头拼缝的转角延性系数达到3.1。整体结构试验研究结果表明:在四侧壁等值对称荷载作用下,采用预应力筋连接的预制预应力综合管廊整体结构的受力过程可分为开裂、屈服和极限破坏三个阶段;破坏形态为接头与整浇侧壁端部截面屈服,结构形成塑性机构,达到承载能力极限状态;破坏机制为弹簧铰闭合框架机制;整体结构试件的极限承载力为设计荷载的3.2倍;整浇侧壁和含拼缝侧壁的位移延性系数分别达到3.87和2.91。本文研究成果为2010年上海世博会园区综合管廊建设以及预制预应力综合管廊的推广应用提供了技术依据。With the construction of a municipal tunnel in the 2010 Shanghai Expo area as the background,monotonic static tests were conducted using full-scale models of joint and structure to investigate the mechanical properties of the precast prestressed municipal tunnel（PPMT） with prestressed tendon joints.Test results of PPMT joint showed that the joint specimen underwent pressure elimination,yielding and ultimate damage.It failed in truss model mechanism,and the failure pattern was characterized by yielding of the prestressed tendon first and then crushing of the concrete in compression zone.The flexural capacity of the joint specimen was about 2.1 times the design bending moment.With increasing loads,the bending stiffness of the joint decreased simultaneously.The displacement and rotation ductility coefficients of the joint speciemen reached about 2.8 and 3.1,respectively.Test results of the PPMT structure showed that the structure specimen underwent elastic,yielding and ultimate damage.Failure pattern of the structure specimen was characterized by yielding of the joints and the end sections of the continuously cast side walls.Plastic mechanism was formed and the structure reached ultimate load-carrying capacity.The structure specimen failed in close frame model mechanism,with elastic hinges forming in the joints.The ultimate load-carrying capacity of the PPMT structure specimen was about 3.2 times the design load,while the displacement ductility coefficients of the continual and precast side walls reached about 3.87 and 2.91,respectively.

关 键 词：预制预应力综合管廊 预应力筋连接 足尺模型 接头 整体结构 单调静力试验 破坏形态 承载力 

分 类 号：TU990.3[建筑科学—市政工程] TU378