预制预应力桁架式钢骨砼框架承载性能研究

With the continuous improvement of comprehensive national power of China, the requirement for construction industrialization is more and more urgent. As a new type of structural system, precast prestressed truss steel reinforced concrete frame can promote the development of industrialization for public buildings, residences and factory buildings. This project will conduct experimental and theoretical studies on the capacity and usability of the precast prestressed truss steel reinforced concrete beams and columns, and it will explore the restraint effect of truss on concrete and prestressing action on structural assembly and crack control to improve its design theory. Based on the low cyclic loading experiments, this project will study the seismic behavior of joint assembly segment and precast prestressed truss steel reinforced concrete frame. Otherwise, it will establish reasonable configration of the joint, structural measures of encryption region and seismic design criteria of the precast prestressed truss steel reinforced concrete frame. Moreover, this project will conduct study on the structure system transformation and mechanical mechanism in the assembling process, by BIM technology and finite element analysis methods to ensure the safety in construction, and will conduct study on the connection type of wet joints, behavioral characteristics of new connection materials to provide advanced technical measures for the structural integrity.

随着我国综合国力的不断提升，建筑工业化的需求越来越迫切。预制预应力桁架式钢骨混凝土框架是一种新型的结构体系，它可促进公共建筑、住宅以及厂房等建筑建设的工业化发展。本项目将展开预制预应力桁架式钢骨混凝土梁、柱的承载性能和使用性能的试验和理论研究；探索桁架对混凝土的约束作用以及预应力对结构拼装和裂缝控制的作用，完善其设计理论；通过低周反复试验研究节点拼装段和预制预应力桁架式钢骨混凝土框架体系的抗震性能；建立合理的节点构造型式、加密区的构造措施以及预制预应力桁架式钢骨混凝土框架结构体系的抗震设计准则；借助于BIM技术和有限元分析方法，研究拼装过程中的结构体系转换及其力学行为，以保证结构施工过程中的安全可靠；研究湿接头的连接形式，新型连接材料的行为特征，提供先进的保证结构整体性的技术措施。

本项目首先开展了桁架式钢骨混凝土梁的受弯和受剪力学性能研究，考虑了桁架式钢骨对实心梁和箱梁构件的受力性能及承载力的贡献，考察了实心梁和箱梁构件的破坏形态，建立了桁架式钢骨混凝土梁正截面和斜截面承载能力的计算方法；然后对桁架式钢骨混凝土长柱正截面受压和斜截面受剪承载性能进行研究，通过角钢应变曲线、混凝土应变、构件变形等数据，考察型钢量、偏心距、剪跨比、有效预压力等对桁架式钢骨混凝土柱受压、受剪承载力的影响；其次对桁架式钢骨混凝土梁框架节点的抗震性能进行试验研究，提出了地震作用下桁架式钢骨混凝土框架结构节点的抗震设计方法和相关抗震构造措施；再次，本项目开展了桁架式钢骨混凝土门式框架的试验研究，考虑了预应力对试件抗震性能的影响，考察该框架结构的延性、耗能能力、刚度退化和变形恢复性能等抗震性能指标，建立了该类框架的荷载-位移恢复力模型，作为以后该框架结构的弹塑性分析的参考依据。