填充墙对钢框架体系受力影响分析

Effects of Filling Walls on Mechanical Behaviors of Steel Frame Structure

目的研究不同材料填充墙以及填充墙厚度和填充率对高层钢结构自振周期的影响,找出较合理的高层钢结构填充墙布置方式.方法以实际工程为背景,利用Midas-Gen有限元分析软件建立带有砌体填充墙的高层钢结构住宅整楼模型,模拟在实际的受力过程中,砌体填充墙与钢框架之间的共同作用,考虑各类砌体填充墙对钢框架的抗侧力贡献.结果得到了不同材料填充墙的高层钢结构的自振周期,厚度为100 mm填充墙框架与纯框架周期比平均值为0.52,厚度为200 mm填充墙框架与纯框架周期比平均值为0.47;找到了影响填充墙高层钢框架结构刚度的影响因素,并通过数值分析得到相关影响规律.结论对于高层钢框架结构通过合理的填充墙布置可以有效增加结构的侧移刚度,在满足变形要求的前提下提高高层钢结构房屋的舒适度.

To find a more reasonable arrangement of filled walls in high-rise steel structure, effects of filled walls with different materials and thickness on the natural vibrating periods of structure were studied. Based on an actual project, a high-rise steel structure model with filled walls, in which contributions of the masonry infill walls to the lateral resistance of the steel frame were taken into account, was established by using the FE software Midas-Gen to simulate the interaction behavior between the filled walls and steel frame by actually loading. The natural vibrating periods of structure with different filled walls were calculated and the effecting factors on the stiffness of filled steel frame structure and the regular pattern were also analyzed. It is found that the average ratio of vibrating periods for frames with infilled walls by thickness 100cm to pure frames is 0. 52, while for the thickness of 200 mm, the ratio is 0. 47. It is indicated that for high-rise steel framestructure, the lateral stiffness and the comfort degree can be effectively increased through a rational arrangement of filled walls.