模块化装配式低层冷弯薄壁型钢墙板结构体系及抗震性能

There are some disadvantage in Low-rise cold-formed thin-walled steel residential system, such as weak efficiency of self-tapping screw, low degree of industrialization poor vibration comfort, high investment and so on, so it is difficult to be applied widely. Self-piercing rivet,with fast and reliable thin plate fixed technology, is used in mechanical field. Besides, Self-piercing rivet has large connection stiffness, shear and tensile strength. In order to improve the performance of connections between cold-formed thin-walled steel parts, Self-piercing rivet will be used to replace the traditional connection of self tapping screw in this project. Light weight, high strength materials are filled into the keel frame to improve the performance of resisting shear, maintenance, hermal insulation, sound insulation and rust prevention. In order to reduce the vibration, lightweight concrete is filled between the steel truss and profiled steel sheet to form the Modular composite floor slab. light steel pipe and bolts which have enough ability of connectivity and convenient modular prefabrication are used to horizontal and vertical connections between wall and floor to form a new type of higher industrialization degree low-rise wall-slab structure prefabricated modularly with cold-formed thin-walled steel. According to relevant results at home and abroad, the mechanical properties, failure modes and mechanism of self-piercing rivet and Module connection; the seismic performance of modular wall; the vibration performance of modular floor; the seismic performance of whole structure and so on will be studied in the structure system, and finally, the corresponding design theory and method will be proposed.

低层冷弯薄壁型钢住宅体系存在自攻螺钉连接效率和工业化程度低、振动舒适度差、造价高等问题，难以大量推广应用。锁铆连接是机械领域中快捷和可靠的薄板连接技术，具有较高的连接刚度、抗剪和抗拉强度。有鉴于此，拟采用锁铆连接代替自攻螺钉连接，以提升冷弯薄壁型钢构件（包括龙骨和桁架）间的连接性能；通过在龙骨墙架中填充轻质高强材料，形成具有良好抗剪、维护、保温、隔音和防锈能力的模块化墙体；通过在桁架与压型钢板间填充轻质混凝土，形成具有较好振动性能的模块化组合楼板；采用具有足够连接能力和方便模块化装配的轻钢管和螺栓进行墙板、楼板的水平和竖向连接，形成工业化程度较高的新型模块化装配式低层冷弯薄壁型钢墙板结构体系。本项目将充分借鉴国内外有关成果，研究和明晰该结构体系中锁铆连接、模块连接的力学性能、失效模式和机理、墙体模块的抗震性能、楼板模块的振动性能、整体结构的抗震性能等科学问题，提出相应的设计理论和方法。

低层冷弯薄壁型钢住宅体系存在自攻螺钉连接效率和工业化程度低、振动舒适度差、造价高等问题，难以大量推广应用。锁铆连接具有力学性能好、连接效率和自动化程度高、便于工厂生产等优点，在汽车与机械领域中已有广泛的研究和应用。有鉴于此，本项目充分借鉴国内外有关成果，将锁铆连接应用于冷弯薄壁型钢组合墙、板构件中，研究新型模块化装配式低层冷弯薄壁型钢墙板结构体系，明晰该结构体系中锁铆连接、模块连接的力学性能、失效模式和机理、墙体模块的抗震性能、楼板模块的振动性能、整体结构的抗震性能等科学问题，提出相应的设计理论和方法。研究结果表明：基板厚度比显著影响锁铆抗拉连接破坏模式，铆钉长度显著影响锁铆连接抗拉性能。提出了基于传染病传播动力学SIR模型的锁铆连接单轴受剪本构模型、不同破坏模式下的锁铆连接抗剪承载力设计计算方法、以及考虑群钉折减效应的多颗锁铆连接抗剪承载力设计计算方法。相比自攻螺钉连接，组合墙采用锁铆连接，其抗拉性能和抗剪承载力、刚度及延性均存在明显优势，但变形能力相对较低；组合墙的抗剪承载力、刚度及能量耗散随开洞率的增加而降低，开洞较小时，洞口两侧采用双立柱及双排铆钉的构造措施加强后可忽略开洞对墙体承载力、刚度、能量耗散的折减效应；开洞能有效提高SPRCFS组合墙的延性，但开洞率过大会导致延性降低。提出了修正的有效条模型以计算组合墙的抗剪承载力。高度、跨度、间距值、弦杆厚度以及铆钉数量对锁铆桁架梁的抗弯刚度和极限承载力影响较大，斜腹杆布置形式对桁架梁的延性及变形影响显著。可采用增加混凝土厚度、跨高比及加强桁架梁节点的形式来提高SPRCFST-C组合楼板模块的抗弯性能。提出了预测组合楼板极限抗弯承载力的方法。给出了3种常见尺寸SPRCFST-C组合楼板模块各构造参数合理组合的容许值。混合连接组合墙和自攻螺钉连接组合墙对结构的抗震性能的提高具有显著作用，延时保护支撑可有效提高冷弯薄壁钢整体结构的抗震性能。