针对管幕预筑板系结构因受力机理不明确、设计理论不完善而导致实际结构设计过于保守、不能充分发挥材料性能的工程问题，本项目通过在结构内设置栓钉及对焊钢筋提出一种新管幕预筑板系地下结构，结合试验和理论分析开展地下大跨类矩形断面新管幕预筑板系结构构件受弯及受剪性能研究，提出结构设计方法。主要研究内容包括，完成新管幕预筑板系结构受弯构件两点加载试验，建立考虑界面滑移的荷载-变形全过程曲线，提出抗弯承载力简化计算式，得出等效弯曲刚度；完成设置对焊钢筋的构件的受剪试验，建立可以考虑钢材对核心混凝土约束作用的受剪分析模型，提出抗剪承载力简化计算式，建议对焊钢筋最小配筋率；建立新管幕预筑板系结构有限元模型，分析结构各部分的受力特点，提出地下大跨类矩形断面新管幕预筑板系结构设计方法。研究成果有助于揭示地下大跨管幕预筑板系结构受弯及受剪机理，完善结构设计计算理论，加快管幕预筑法在我国的推广和应用。

Considering the fact that the safety of pipe-roof pre-construction plate structures is too conservative and the materials in structures are not fully activated due to the inexplicit stress mechanism and imperfect design theory, new pipe-roof pre-construction (NPP) plate structures are proposed in this project. In the proposed NPP plate structures, studs and bi-steels are set on steel plates to make the steel plates and concrete as a whole to bear the loads together. The flexure and shear performance of members in large-span NPP plate structures with quasi-rectangular cross-sections, as well as the design theory, are investigated based on experimental study and theoretical analysis in this project. The static experiment for NPP flexural members is performed. The load-deformation process curve considering interface slip is predicted, and the simplified calculation formula for flexural bearing capacity is proposed. A design formula for the equivalent rigidity of NPP flexural members under vertical loads is also developed. The shear experiment for members of NPP plate structures with bi-steels as tensile reinforcement is performed. The shear analysis model, which can consider the restriction effects of steel plates and bi-steels on core concrete, is developed, and the simplified calculation formula of the shear bearing capacity is proposed. The minimum reinforcement ratios of bi-steels are suggested. The finite element model of NPP plate structures is established to analyze the stress of each part in the structures. Based on the above research results, the design method of large-span NPP plate structures with quasi-rectangular cross-sections is proposed. Research results in this project have contributed significantly to deepening the understanding of flexure and shear mechanism of NPP plate structures, perfecting the structure design calculation theory, and accelerating the popularization and application of NPP plate structures in China.