钢筋砼宽柱双梁框架结构体系应用于旧房托换改造中的设计理论研究

Reconstruction of old city building has become a hot issue in our country. Reinforced concrete frame structure composed of wide column and double beams is a perfect approach to rebuild masonry structure into large space one. This project will study a ductility design method to promote the practical application based on the characteristics of this new type of structure..1. A kind of connector with simple details and convenient construction will be designed by studying assuring measures of superimposed uniformity for new beams and old slab. .2. A design method of composite component of double beams clipping wall will be established according to the experimental study on the contribution of masonry in this component to the bearing capacity of normal section and inclined section of beams..3. A ultimate loading capacity calculation method of corners-hole slab will be build by principle of virtual work based on the experimental study..4. Seismic performance of double beam-wide column joints under horizontal low cyclic loading will be studied, and a design method will be proposed..5. Design method of frame structure of wide column and double beams will be build based on the above design method of structure components. .6. Cooperative working mode of outer longitudinal wall and frame beam-column will be build and reasonable design method of connector will be arrived at utilizing the continuity hypothesis.

旧城改造是我国各地政府普遍关注的热点问题，钢筋混凝土宽柱双梁框架结构体系是解决砌体结构托换改造成大空间的优选方案，本项目将针对该体系的特点，研究其延性设计方法，促进该体系的推广应用。.1.通过研究新梁旧板叠合的整体性保证措施，利用混凝土浇筑孔洞，设计一种构造简单，施工方便的传剪器；.2.根据试验研究双梁夹墙中砌体对构件正截面和斜截面承载力的贡献，建立双梁夹墙组合构件的设计计算方法；.3.通过试验研究四角开孔板的合理塑性铰线，利用虚功原理建立其极限承载力计算方法；.4.通过低周往复试验，研究宽柱双梁框架节点的抗震性能，建立其设计计算方法；.5.基于上述各构件承载力的计算方法，建立宽柱双梁框架结构体系的设计方法；.6.采用连续化假设，建立外贴纵墙与框架梁柱协同工作模式，得到连接件的合理设计方法。

钢筋混凝土宽柱双梁框架结构体系是解决砌体结构托换改形成大空间结构的优选方案，本项目针对该体系的特点，从多个方面开展钢筋混凝土宽柱双梁框架结构体系托换改造的设计理论的研究，以促进该体系在旧房改造中的推广应用。本项目首先开展了单托换梁和双托换梁构件的受弯和受剪力学性能研究，考虑了砌体对组合构件的受力性能及承载力的贡献，考察了组合构件的破坏形态，建立了组合构件正截面和斜截面承载能力的计算方法；然后对钢筋混凝土宽柱双梁框架节点的抗震性能进行试验研究，提出了地震作用下宽柱双梁框架结构节点的延性设计方法和相关抗震构造措施；其次，本项目开展了缺角混凝土板的试验研究及受力全过程非线性数值分析，建立了缺角混凝土板的极限承载力计算方法；再次，本项目对新梁旧板叠合构造开展了受弯和受剪性能研究，重点考察了新梁旧板间传剪器对受力性能的影响，建立了新梁旧板受弯和受剪承载力计算方法；最后，本项目对外贴墙体与框架梁柱的连接设计及抗倒塌性能进行分析，提出相应的设计方法。