摘要
钢箱—混凝土组合梁兼有实心和箱形截面杆件的特点,扭转时主要表现为纯扭转形式。通过分析其纯扭转应力函数的特点,提出了采用差分法、箱形截面简化法计算其纯扭转刚度。与纯扭转试验结果进行比较分析表明,差分数值方法计算结果与试验分析结果接近。此外数值计算分析表明,若混凝土所占面积不大,则忽略混凝土简化为箱形截面计算扭转刚度也能满足工程精度要求,且偏于安全。
It is complex to analyze the torsional behavior of steel-box concrete beam because its complex section with the properties of both solid and hollow members. Two different methods for the investigation of the torsional behavior of the beam are thusly suggested by analyzing the characteristics of the pure torsion stress function. The two methods are respectively difference method and simplified method, simplifying the member as a box beam with two cells. The torsion stiffness and shear stress calculated by the difference method are close to their corresponding test results. Besides, numerical analysis shows that if the area occupied by the concrete on the cross-section is less enough, the stiffness calculated by ignoring the concrete can also satisfy the engineering requirement.
出处
《工程力学》
EI
CSCD
北大核心
2007年第5期125-131,共7页
Engineering Mechanics
基金
国家自然科学基金资助(50478099)
关键词
钢箱-混凝土组合梁
纯扭转应力函数
扭转刚度
差分法
简化方法
steel-box concrete beam
stress function of pure torsion
torsion stiffness
difference method
simplified method
