砖混结构大开洞改造中型钢砌体组合梁的研究与应用

Evaluation and Strengthening of Steel and Masonry Composite Beam Based on Underpinning Technique for Large Door Opening at the Ground Floor in Masonry Structure

摘要: 既有砖混砌体结构房屋，由于使用功能的改变，通常进行开大门(窗)洞改造。对部分承重墙体进行拆除，导致了原结构荷载传递路线发生变化，使得局部砖墙承重体系转化为梁托砌体墙的底部框架砌体结构。型钢–砌体组合梁托换法以其具有刚度大、整体性好、施工便捷等优点在梁托墙承重结构加固改造中推荐优先选用。鉴于目前型钢–砌体组合梁精细化分析研究尚少，本文结合工程实例，采用有限单元法深入研究了型钢托换组合梁的力学应力和应变特性，探究了型钢组合梁托换法应用在砖混房屋大空间改造中的设计和施工技术要点。

Abstract: A lot of old masonry structures, for functional change such as large door opening at the ground floor, need to be remoulded and strengthened. For most of the bearing wall removed at the ground floor, which caused the load transfer route changed, the load-bearing structure of ma-sonry structure was transformed to masonry structure with bottom story frame. The under-pinned technology of steel and masonry composite beam can be recommended for stiffness, en-tirety, and construction used in the reinforced structure of beam-supported wall. At present, for the detailed research is rare in the point of steel and masonry composite beam, mechanical property of the beam was studied deeply with finite element method and project example. Based on the research, Finite Element Method was used to study the mechanical property of stress and strain for the steel and masonry composite beam, and the difficulties of the underpinned tech-nology were explored for design and construction.