钢箱-混凝土组合梁的扭转特性分析

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。

TORSIONAL BEHAVIOR ANALYSIS FOR STEEL-BOX CONCRETE BEAM

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.