Researches On Structures With Chained Small-Sized Hollow Concrete Block Masonry For Multistory Large-Bay Residence

Multistory large-bay residence is a type of building which will widely developed. Whether masonry structures can be used in multistory large-bay residence is a problem widely regarded in engineering. So multistory large-bay residence compose of chained small-sized hollow concrete block masonry (CCBM) walls and concrete two-way slabs are presented. Based on the previous research, the influence of the constructional column sections and the amount of longitudinal steel content on the seismic behavior of the walls are further studied as well as the application of the two-way hollow slab supported on masonry.CCBM is a new type of masonry, it is a patent of professor LanZongjian which inserting T-shaped bolts (which shape like the letter T) in the holes to cluch the above and the under layers tensely, T-shaped bolts can increase the shear capability of block masonry so as to increase the seismic capability of the whole masonry structure. Previous researches by our reseach group indicate that the seismic capability of CCBM wall is better than that of common small-sized hollow concrete block masonry (CBM) walls, the seismic behavior of the CCBM walls with constructional columns is superior to that of the CCBM walls with the core columns under the same conditions, The vertical loads have influence on the seismic behavior of the CCBM walls.Based on previous experiments done by our research group (3 specimens of walls with 2 core columns, 4 specimens of walls with 2 constructional columns), there are 2 specimens of the CCBM walls with constructional columns and 1 specimen of the common CBM wall under cyclic loads were tested for further research about the seismic behavior, the process and the form of the CCBM walls ruin are studied,as well as the influence of the constructional column sections and the amount of longitudinal steel content on the seismic behavior of the walls.Experiments show that the cracking load and the shear strength of the CCBM walls are larger than those of the CBM walls. Compared with the CBM walls, the CCBM walls have greater shear strength, better ductility, larger deformation and superior enegy dissipation capability.Besides, the constructional column sections and the amount of longitudinal steel content have obvious influence on the seismic behavior of the CCBM walls.Based on the above researches, the influence factors and mechanical behavior of the CCBM walls'shear capability under the horizontal and the vertical loads are analyzed, the formula of shear capability of the CCBM walls is presented. Cast-in-situ RC two-way hollow slab is a new kind of floor structure with circular holes which were made of hollow pipes putting in it. It has almost the same strength as common slabs with less weight.Based on the study of concrete two-way hollow slabs supported on beam-column systems by our research group, the behavior of the concrete two-way hollow slabs supported on masonry is studied. Working behavior of hollow slabs supported on masonry is better than that of the slabs supported on column-beam system. Compared with the sime height of solid slabs, RC two-way hollow slab has almost the same bearing capability and its deflection can easily meet the code. It shows that the working behavior of two-way hollow slabs like that of solid slabs, it can be trated as solid slabs.Besides, minimum ratio of height to span of the two-way hollow slabs under common situations which meet the code is studied, which can be a reference to the height design of two-way hollow slabs. It shows that the height of two-way hollow slabs little than 200 mm can meet the code.