新型装配式钢桁架梁组合楼盖体系平面内刚性性能研究

With the rapid development of the construction industry, the assembly composite floor system has been greatly popularized and applied. The in-plane deformation performance of this floor system is different from that of the traditional integral cast-in-place floor system. The in-plane stiffness and the overall performance of this floor system have a crucial impact on the force performance of the overall structure. There is no clear stipulation on how to evaluate the in-plane rigid performance in the assembly composite floor system in our codes. For a new type of assembly steel truss girder composite floor system suitable for multi-columns bundle tubes tall steel structures system, the following researches of scientific issues and key technology are supposed to be carried out in this project: 1. bearing capacity and initial connection stiffness of assembly joints of plate-plate double-piece steel truss girder. 2. bearing capacity and initial connection stiffness of plate-column- pin assembly connection. 3. experimental study on in-plane rigidity performance along the seam direction of the new assembly steel truss girder composite floor system. 4. experimental study on in-plane rigidity performance perpendicular to the seam direction of the new assembly steel truss girder composite floor system. 5. parameter analysis and rigidity evaluation of in-plane rigid performance of new type of assembly steel truss girder composite floor system. The research results of this project will be of great significance to promote the development of assembly steel structure, provide reference for the compilation of relevant codes and provide theoretical basis and technical support for engineering application.

随着建筑工业化的迅猛发展，装配式组合楼盖体系得到了大力推广与应用，该楼盖体系的平面内受力变形性能与传统的整体现浇楼盖体系存在较大差别，其平面内刚性性能对整体结构的受力性能存在重要影响。如何评定装配式组合楼盖体系平面内刚性性能，我国规范尚无明确规定。本项目针对适用于高层密柱束筒钢结构的新型装配式钢桁架梁组合楼盖体系，拟开展以下科学问题和关键技术的研究：1.板-板双拼钢桁架梁装配连接节点的承载能力及初始连接刚度；2.板-柱销轴装配连接节点的承载能力及初始连接刚度；3.新型装配式钢桁架梁组合楼盖体系顺板缝方向平面内刚性性能的试验研究；4.新型装配式钢桁架梁组合楼盖体系垂直板缝方向平面内刚性性能的试验研究；5.新型装配式钢桁架梁组合楼盖体系平面内刚性性能的影响参数分析及刚性性能评估。本项目研究成果对推动装配式钢结构的发展具有重要意义，能够为相关规范的编制提供参考，为工程应用提供理论基础和技术支撑。

在楼盖体系中采用模块化预制装配技术，能最大程度化满足构件的工厂化生产要求，也能极大推动建筑的工业化发展。本项目提出了一种采用模块化预制组合单元的装配式钢桁架-混凝土组合楼盖，该楼盖适用于多高层密柱框筒钢结构体系，但工厂化生产的预制楼盖的运输受车辆运输尺寸限制，故跨度稍大的装配楼盖一般都是由几块楼盖单元拼装而成。在拼装的过程中产生的拼装缝影响装配楼盖平面内受力性能及刚性性能，与整体现浇楼盖存在较大差别。楼盖体系平面内（水平方向）刚性性能及整体性对结构的分析具有重要意义，平面内刚性楼盖使得结构分析的自由度大大减少，是因为其在平面内仅产生刚性位移，不产生相对变形，使得计算分析大为简化；而半刚性或柔性楼盖在整体结构分析过程中必须考虑楼盖自身平面内的变形，使结构的整体分析变得复杂。本项目开展了试验研究与有限元分析，详细探讨分析了该类型楼盖体系平面内的变形、整体性及刚性性能，以及影响该楼盖体系平面内刚性性能的相关因素。采用已有的位移比值法、整体变形偏差法、导荷性能偏差法对带密集框架柱的装配式组合楼盖平面内的刚性性能进行评估，提出了评定带密柱框架的组合楼盖的刚性性能的修正位移比值法。对灌缝组合楼盖平面内刚性性能的理论分析方法进行探讨，得到修正位移比值法的理论计算公式，其计算结果与有限元分析结果吻合良好，该计算公式能用于灌缝组合楼盖的刚性性能评估。