摘要
为正确掌握承受较大协调扭矩作用的预应力楼盖约束构件在各阶段的受力性能,对各种典型分析方法的适用性进行了比较,建议采用在弹性扭转刚度的基础上根据不同阶段的受力特点对其刚度进行相应折减的变刚度分析方法。通过对一个边梁协调扭转开裂工程实例的全过程模拟分析,对该边梁各阶段的受力性能进行了评价,并结合试验结果探讨了扭转刚度折减系数的取值。结果表明:该分析方法能较好地反映该边梁的实际开裂状况,合理地描述各阶段的受力性能,揭示了预应力次扭矩的作用特点,为类似结构的分析和设计提供了参考。
In order to master accurately the performance of the structural components in each loading stage which are subjected to great compatibility torsion in the prestressed roof, the applicabilities of several typical analysis methods are compared to each other. An analytical method based on variational stiffness is proposed which discounts the component＇s elastic torsion stiffness based on the performance in different loading case. By the simulation and analysis of the whole process of a project in which the side beam cracked due to the compatibility torsion, the performance of the side beam in each loading cases was evaluated, and the discount modulus of the torsion stiffness was discussed based on the test results. Results show that this analytical method reflects the actual cracked condition and the performance of the side beam in each loading cases better. It reveales how the prestressing secondary torque works and provides references to the analysis and design of similar structures.
出处
《工程力学》
EI
CSCD
北大核心
2006年第8期25-30,35,共7页
Engineering Mechanics
基金
国家自然科学基金资助项目(59338130)
关键词
结构工程
预应力
变刚度
边梁
次扭矩
协调扭转
structural engineering
prestress
variational stiffness
side beam
secondary torque
compatibility torsion
