Theory And Performance Experimental Study On High Performance Mortar Of Damped Layers Of Damped Infill Wall

Infilled frame structure is widely used in all types of building structural system. Research shows that, although infill wall is the non-load-bearing member in seismic design, its own seismic performance and the impact on capacity, stiffness and deformation properties of the main structure cannot be ignored. It is not always safe to ignore the impact of infill wall. Infill walls of the frame structures showed severe damage in earthquake. Seismic safety of non-structural components attracts more attention among scholars. This thesis carries on innovation based on damping infilled frame in materials and configurations modes of damping layer. Finally a new high damping infilled Frame is invented. The main contents are:(1) This thesis designs a damping layer unit using high damping mortar. By mixing acrylic emulsion(A) and styrene-butadiene emulsion(B), we research on the preparation and quasi-static test of high damping layer of cement mortar. And the hysteretic behavior, deformation capacity and stiffness characteristics of damping layer’s specimen with high performance mortar were also studied comparatively. The results indicate that high-performance damping layer of damped infill wall plays a good role in energy dissipation and horizontal shear deformation capacity. With the increase of polymer content in high-performance mortar damping layer, the deformation capacity and damping capacity of mortar layer will be enhanced. The hysteresis curve of the specimen is plumper, which means energy dissipation is excellent. However, the strength of the damping layer is weakened. Therefore, using high-performance mortar as damping layer in the damped infill wall is a new rational approach.(2) On the basis of experimental study on high damping mortar, this thesis designs one-story, one-bay frame with high damping infill wall and improves the construction of damping layer using the vertical offset zigzag form. Experimental research is carried on under low cyclic loading. The results reveal that: zigzag form of damping layer can increase the deformation of frame, while the high damping mortar layer is better connected with masonry units. The hysteresis curve of frame with high damping infill wall is more full and has more energy dissipation under the external load.(3) This thesis used ABAQUS software to build a finite element model of frame with high damping infill wall for finite element simulation and parameter analysis. The results show that: the numerical simulation values of the load-displacement curve and skeleton curve are consistent with the experimental research; with increasing the thickness of the damping layer, the bearing capacity and ductility of frame with high damping infill wall are improved and hysteretic curves gradually plump, but the improvement ability is limited; with an increase of axial compression ratio, the bearing capacity of shear wall components increases significantly, but the ductility decreases rapidly.