作　　者： ; ; ; ;

机构地区： 广州大学

出　　处： 《土木工程学报》 2008年第12期21-27,共7页

摘　　要： 结合深梁的"拉杆-拱"传力机理,提出新型内置钢构架型钢混凝土深梁,将钢构架的各部分杆件分别用于传力机构中的拉杆和压杆中,并对一榀普通钢筋混凝土转换深梁、三榀内置钢构架型钢混凝土转换深梁模型进行试验研究,分析这种新型转换深梁在竖向集中荷载作用下的力学性能和破坏形态,研究深梁在受力过程中的钢筋和钢构架的应变变化特点、传力机理。试验表明内置钢构架型钢混凝土深梁具有承载力高、刚度大、延性好等优点。相同参数条件下,内置钢构架型钢混凝土深梁承载力比普通钢筋混凝土深梁提高30%～40%,抗剪承载力提高幅度尤为显著,刚度提高30%～50%。内置钢构架型钢混凝土转换深梁充分利用了深梁的拉杆拱传力机理,设置钢构架实现以最短、最直接的传力路线和传力方式传递上部荷载。偏于安全估算,钢构架能承担20%深梁总荷载。 Based on the strut-and-tie force transfer mechanism of deep beams, a new type of steel truss reinforced concrete （STRC） deep beam was developed, in which the members of steel truss were arranged as struts and tie bars. Experiments were conducted for one reinforced concrete transfer deep beam and three STRC transfer deep beams to study the process of force bearing and failure characteristics of the newly developed transfer beam under vertical concentrated loads. Strain in the reinforcing bars and the steel truss and the force-transfer mechanism of the deep beams were analyzed. Experimental results showed that the STRC transfer deep beams have high bearing capacity, large rigidity, and good ductility. Under identical conditions, compared with the reinforced concrete deep beam, the bearing capacity of the STRC deep beam can be enhanced by about 30% to 40%, and more significantly, the shear capacity and the rigidity can be improved by about 30% to 50%. The strut-and-tie force transfer mechanism of deep beams was fully used in the STRC transfer deep beam, and by arranging the steel trusses, the shortest and most direct force transfer path was achieved to transfer loads. The steel truss can undertake about 20% of total loads for estimation on the safe side.

关 键 词： 内置钢构架 型钢混凝土 转换深梁 传力机理 力学性能

领　　域： [建筑科学]