钢筋模板一体化剪力墙受弯性能试验研究

为提高装配式建筑施工速度，减少施工工序，提出了一种装配式建筑结构体系——钢筋模板一体化剪力墙结构体系，其两侧采用20mm厚高性能纤维砂浆板作为模板，钢筋骨架配置于中部空腔内，具有自重轻、易于运输、安装等特点。通过对4个剪力墙开展拟静力试验，研究了剪力墙的受力性能和连接界面的性能。研究结果表明：一体化剪力墙的受弯承载力、刚度和延性与钢筋混凝土剪力墙基本相当，能够满足“等同现浇”的设计要求；模板与混凝土整体性良好，剪力墙屈服时模板与混凝土保持整体，破坏(加载点位移角θ>1/60)时模板未发生剥离，模板与后浇混凝土保持共同受力；连接件间距为400mm、预制模板内侧自然成型的一体化剪力墙的模板构造满足受力要求。模板拉毛处理和连接件的加密具有延缓结合面开裂的作用，对剪力墙的承载力、刚度、延性等基本无影响。

Experimental study on flexural performance of integration of reinforcement and formwork shear walls

In order to increase the construction speed of prefabricated buildings and reduce construction process, a novel prefabricated building structure system was proposed, which was the integration of reinforcement and formwork shear wall system. The 20 mm high-performance fiber mortar slab is used as the formwork on two sides, and the reinforcement cage is placed between the formworks, which has many advantages such as lighter weight and easier to transport and install. Pseudo-static tests on four shear wall specimens were carried out to study the flexural performance of the wall and the properties of the concrete-formwork connection interface. The study shows that the bearing capacity, stiffness and ductility of the integration of reinforcement and formwork shear walls are equivalent to those of the cast-in-place reinforced concrete shear walls, and therefore satisfy the design requirement of ‘equivalent cast-in-place’. The integrity of the mortar slab and the post-cast concrete is favorable. When specimens yield, the formwork and concrete work together. When the specimens are damaged (drift ratio at loading point θ>1/60), the formwork and concrete keep working together and no peeling is found. The formwork configuration of integration of reinforcement and formwork shear wall with 400 mm spacing between connectors and natural state inside the formwork could meet the mechanical performance requirements. The internal surface of the formwork which is treated with a brushed surface or reduced the spacing between connectors could delay the crack of the connection surface, whilst having basically no effect on the bearing capacity, stiffness and ductility of the specimens.