施工时间参数对混合体系竖向变形差的影响

Influence of Construction Time Parameters on the Vertical Differential Shortening of Hybrid Structures

利用考虑时间因子的有限元方法研究了钢框架-钢筋混凝土核心筒混合体系的竖向变形差问题.分析表明,施工方案中的时间参数可以确定结构计算中需要考虑的混凝土收缩徐变的数量和参与作用的时间,从而使混凝土收缩徐变对体系竖向变形差以及各构件内力分配的影响发生明显变化.适当增大结构混凝土部分相对于钢结构部分提前施工的层数是减小混凝土收缩徐变效应的较好方法.

By using the finite element method with consideration of time factor,the vertical differential shortening and member internal forces of steel frame-reinforced concrete corewall structures were analyzed.The studies show that the amount and the involvement time of concrete shrinkage and creep are determined by the time parameters in construction scheme,which change the effect of concrete shrinkage and creep obviously.To reduce the effect of shrinkage and creep,it is a good method to appropriately increase the number of floors of concrete corewall before the steel frame is constructed.