钢筋混凝土斜支撑框架结构优化设计

发布时间：2018-10-10 20:32

【摘要】：钢筋混凝土斜支撑框架结构体系是在框架结构中布置一定数量的混凝土斜支撑。该结构体系由于增加了斜支撑，提高了框架的侧移刚度，同时斜支撑布置位置比较灵活，在使用功能上优于框架—剪力墙结构体系。另外，，混凝土斜支撑具有浇筑的整体性以及可以单向布置等特点，在某些方面也优于钢结构斜支撑。课题利用PKPM系列结构设计软件建立模型，针对同一平面形式，建立框架结构、框架—剪力墙结构和钢筋混凝土斜支撑框架结构模型。具体取一栋地上11层及地下1层的4×5跨结构。该结构质量、刚度分布皆均匀、规则，地下1层至3层层高4.8m，其余各层3.3m，设防烈度为8度，设计基本地震加速度0.2g，Ⅱ类场地。通过这几种结构在地震作用下的弯矩、剪力、弹性层间位移角、顶点位移来判断各种结构形式的合理性，再比较其含钢量的大小。通过结构的内力和含钢量的综合对比，进行优化设计。对于高层结构，内力的对比表明，框架—剪力墙结构在X、Y两个方向上的剪力墙的布置，容易导致两个方向上的刚度差异较大；增大斜支撑截面，结构的刚度明显增大。其中，混凝土双向斜支撑的效果比单向斜支撑的效果显著，适用于高烈度地震区和层高较大的结构；含钢量的对比表明，钢筋混凝土斜支撑框架结构较为经济。另建立一栋地震设防烈度为8度，设计基本地震加速度为0.2g的5层小学建筑，通过对比框架—剪力墙结构和钢筋混凝土双向斜支撑框架结构的计算结果表明，前者的刚度比后者的大很多；而后者的含钢量比前者略小。
[Abstract]:Reinforced concrete oblique braced frame structure system is a certain number of concrete slant braces arranged in the frame structure. Because of the increase of oblique bracing, the lateral stiffness of the frame is improved, and the position of the inclined bracing is flexible, which is superior to the frame-shear wall structure system in using function. In addition, the concrete oblique braces have the characteristics of the integrity of pouring and can be arranged in one direction, which is superior to the steel structure in some aspects. The model of frame structure, frame-shear wall structure and reinforced concrete slanting braced frame structure are established by using PKPM series structural design software, and the frame structure, frame-shear wall structure and reinforced concrete oblique braced frame structure model are established for the same plane form. A 4 脳 5 span structure of 11 stories above ground and 1 underground floor is taken. The mass and stiffness distribution of the structure is uniform, regular, the height of the first to third layers is 4.8 m, the other layers are 3.3 m, the fortification intensity is 8 degrees, the basic seismic acceleration is 0.2 g, and the second type site is designed. According to the bending moment, shear force, elastic interstory displacement angle and vertex displacement of these structures under earthquake action, the rationality of various structural forms is judged, and the amount of steel in the structures is compared. Through the comprehensive comparison of the internal force and the steel content of the structure, the optimum design is carried out. For high-rise structure, the comparison of internal forces shows that the arrangement of shear wall in the two directions of frame and shear wall easily leads to the difference of stiffness in two directions, and the stiffness of the structure increases obviously when the cross-section of inclined bracing is increased. The effect of concrete bidirectional oblique bracing is better than that of unidirectional oblique bracing, which is suitable for structures with high seismic intensity and high story height, and the comparison of steel content shows that reinforced concrete oblique braced frame structures are more economical. In addition, a five-story primary school building with an earthquake fortification intensity of 8 degrees and a basic seismic acceleration of 0.2 g is established. The calculation results of the frame-shear wall structure and the reinforced concrete bidirectional oblique braced frame structure show that, The stiffness of the former is much greater than that of the latter, and the steel content of the latter is slightly smaller than the former.
【学位授予单位】：河北联合大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.4

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