摘要
多方案模拟4个大跨度预应力次梁楼盖试件的边梁协调扭转试验，分析比较各方案的开裂荷载、极限荷栽以及边梁的协调扭矩、单位长度扭转角、边梁扭转刚度等结果，得出的主要结论有：在整个受力过程中，边梁协调扭矩总体呈增长趋势，并不因边梁开裂而明显下降；美国ACI318—05规范的开裂扭矩值偏小，与边梁极限扭矩相差较大；对于开裂后的大跨度预应力次梁楼盖边梁扭转刚度折减系数，无整浇板时可取0．05～0．10，带整浇板时可取0．10～O．40。
Multiform simulations of 4 specimens＇ compatibility torsion experiments of a spandrel beam in a long-span prestressed concredt （P. C. ） secondary beams floor system are introduced. The results of different simulation methods, such as crack loading, ultimate loading, the torque, twist and torsional stiffness of spandrel beams, are compared and analyzed. The main conclusions are as follows： The compatibility torque of a spandrel beam continuously increases with the load in all the process; The torque does not decrease obviously after cracking; The cracking torque value given by the American Concrete Institute （ACI） Code 318-05 is much smaller than the ultimate torque; The reduction parameter of the torsion stiffness in a spandrel beam after cracking equals 0.05-0.10 for a long-span P. C. secondary beams floor system without monolithic slabs, and 0.10-0.40 with monolithic slabs.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第1期55-60,66,共7页
Journal of Chongqing University
基金
留学回国人员科研启动基金(教外司留[2007]1108)
关键词
边梁
协调扭转
大跨度预应力次梁楼盖
spandrel beam
compatibility torsion
long-span prestressed concrete secondary beams floor system
