Elastic-plastic Seismic Response Analysis On Concrete Hollow Block Masonry Structures

As a new kind of masonry material, concrete hollow block has been widely used recent years because of land reservation and energy saving. And concrete hollow block tends to be used in middle height and high-rise buildings. On the basis of model test on shaking table and numerical simulation, this paper illustrates the feasibility of middle height and high-rise hollow concrete block masonry structures in seismic region. Main contents of this thesis are summarized as follows:1. Earthquake simulation test: Seismic behavior such as amplification, predominant frequency changes etc. are obtained.2. Elastic numerical simulation: In analytical model, masonry walls are simulated with shell elements, tie beams, structural columns and core columns with frame elements. Equivalent density is used as the density of the block, and the floor slabs are assumed rigid in plane. The result of numerical simulation demonstrates the low modes of analytical model coincided with experiment results; it is feasible that masonry is considered as uniform material.3. Elastic-plastic numerical simulation. Nllink elements consist of axis spring, shear spring and flexure spring are introduced to the tie beams and the walls located in the lower four floors of elastic FE model. The result of time history analysis demonstrates that the elastic-plastic FE model can simulate the earthquake response of the model structures well when they are subjected to minor earthquake or moderate earthquake. A conclusion can be drawn that the FE model and the parameters are reasonable and convincible.