可循环使用全装配式钢-混凝土组合梁的破坏机理和设计理论研究

Composite beams consisting of steel beam and steel reinforced concrete slabs are popular gravity load carrying members. With the recent development of industrialized construction technology, the composite beams with the cast-in-place concrete slabs progressively fail to meet the need of future market.Although the researchers in the related field have developed new types of composite beams to minimize the work at construction site, the existing types of composite beams either encounter significant technical challenges for installation at the construction site or fail to effectively eliminate the member defects. Moreover, the existing types of composite beams can not be repaired or re-used after deconstruction. This research intends to develop an innovative type of composite beam through theoretical derivations, numerical simulations and experimental investigations. Components in the new composite beam can be fully manufactured through a standard process in shop and they can be assembled at a construction site without the need of special equipment and in a timely manner. This research team will develop a scientific method to capture behavior of the composite beam, identify the critical parameters for performance control,and establish an analysis model for the beam taking into account the influence of slip along the interface between the steel beam and the reinforced concrete slab. The research team will also derive a framework for design of the composite beam and experimentally verify the reparability and reusability of the composite beam. The expected research outcomes will provide a base and generate the critical experimental data necessary to promote the use of the new composite beam in future practice.

钢-混凝土组合梁是一种常见的承受竖向荷载的构件。随着装配式建筑成为行业发展的新方向，传统基于现浇工艺的钢-混凝土组合梁已经无法满足未来市场的需要。虽然近年来科研人员发展了几种装配式钢-混凝土组合梁，但是这些方案在实际使用中都存在难以克服的技术难题或者无法有效保证产品质量；另外，现有方案无法实现组合梁的局部替换和循环利用。本项目将结合理论分析、数值仿真和结构试验等手段，研发一种适合标准化设计、工厂化生产、现场安装设备简单、施工速度快、施工过程易管理的全装配式组合梁。本项目将建立对新型组合梁的性能分析和评价方法；阐明该体系在组合程度方面的性态控制准则；构建考虑钢梁与预制楼板交界面滑移影响的组合梁分析模型；完善和改进新型组合梁设计理论；验证和评估新型组合梁可重复使用性和局部楼板可更换性。预期成果可以为我国推广全装配式组合梁体系提供必要的科学依据和试验基础。

钢-混凝土组合梁是一种常见的承受竖向荷载的构件。随着装配式建筑成为行业发展的新方向，传统基于现浇工艺的钢-混凝土组合梁已经无法满足未来市场的需要。虽然近年来科研人员发展了几种装配式钢-混凝土组合梁，但是这些方案在实际使用中都存在难以克服的技术难题或者无法有效保证产品质量；另外，现有方案无法实现组合梁的局部替换和循环利用。项目结合理论分析、数值仿真和结构试验等手段，研发了一种适合标准化设计、工厂化生产、 现场安装设备简单、施工速度快、施工过程易管理的全装配式组合梁。项目主要开展了以下研究：连接紧固件的选型优化、加工方法和安装工艺；全装配式组合梁受力机理、抗弯性能和设计方法；全装配式组合梁的楼板可更换性和可重复使用性；部分包覆钢-混凝土组合蜂窝梁的抗弯性能研究。试验与理论分析结果表明：TJ型紧固件和钢导槽都表现出较好的工作性能，钢梁与预制楼板之间通过摩擦传力，预制楼板及钢导槽均无破坏，可重复使用；钢梁与预制楼板表现为部分组合作用，提出的抗剪连接件承载力计算公式、紧固件预紧力计算公式和组合梁的抗弯刚度、承载力计算公式均与试验结果吻合较好，可以用于指导工程设计。将研究成果成功应用于低多层建筑示范工程，具有施工速度快、连接方便、便于拆卸、综合成本低的优点，实现了可循环使用的目标；另外，研究成果因具有可循环的优势，大幅减少资源浪费，降低人工费，节能减碳，符合国家绿色高质量发展战略。