Study On Compressive Behavior Of Cross Bore Block Masonry Under Different Masonry Methods

Our research group proposed a new concrete hollow block—cross bore chain concrete hollow block aimed at solving the problems existed in the ordinary vertical bore block, such as the little hollow rate, wall cracking, bad heat protection, constructing and embedding line pipe difficultly. Top board, bottom board, up rib, down rib and jamb wall constitute the hollow block, which has many advantages, such as leakage prevention, anti-cracking, heat-preserving, light weight, anti-seismic, land-saving, environment-protecting and so on.. It has two different masonry methods —dry method and wet method.In recent years, our research group has accomplished studies of the bore block masonry’s compressive behavior, shear behavior, anti-seismic behavior and local compressive behavior. However, these studies are all based on onefold masonry method without considering the effect of different masonry methods on the block masonry’s mechanical behavior. The compressive behavior of the block masonry under different masonry methods was studied by experimental research and finite element analysis in this paper. The main research contents are as follows:(1)Experiments on compressive behavior of six group masonry specimens were carried out to analyse the differences between their failure characteristics and ultimate bearing capacities and study the effect of two different masonry methods on compressive behavior of the block masonry of different types. The results show that the dry masonry losses its bearing capacity after cracks appearing and developing in the corner of the cross bore, while the wet masonry is crushed without cracks appearing. The wet masonry’s compressive strength is much higher than that of the dry masonry. The effect of different masonry methods on the masonry of smaller size is more obvious.(2)The block masonry’s finite element models under different masonry methods are built in analytical software ABAQUS. Based on the simulation of the masonry specimens’ s pressed process, stress distribution nephogram, plastic strain distribution nephogram and ultimate bearing capacity are analysed. Moreover the masonry’s failure mechanism is discussed, combining the experiments’ process and results. The influence of jamb wall’s thickness and block’s thickness on the compressive behavior of the wet model is researched, too.