Simulation On Out-of-plane Mechanical Performance Of Outer Longitudinal Wall Based On ABAQUS

With the rapid development of social economy, land shortage has become a prominent problem in our country at present. At the same time, under the guidance of local governments, an upsurge of reconstruction of old city building was set off. Government planning department, however, often required that in the reconstruction process, we must stick to the original style and features in order to protect the old buildings for the principle, and we can only change the internal function. Therefore, reinforced concrete frame structure composed of wide column and double beams, as a kind of new concept was put foward at the historic moment. The system can reasonably change small space into large one,and it can be widely used in masonry structure and concrete structure reform of the residential, hotel, hospital, etc.As the product of reinforced concrete frame structure composed of wide column and double beams, outer longitudinal wall belongs to both of the system and the old building. Outer longitudinal wall is different from masonry infilled wall as well as unreinforced masonry wall. And there are no related reports in any literatures. Thus, research on the mechanical property of outer longitudinal wall is of great significance to the evaluation of bearing capacity of such components, the perfection of design theory and the reconstruction of old buildings.Based on the finite element software ABAQUS 6.10 platform, the integrated finite element models of outer longitudinal wall were established to study on the out-of-plane mechnical performance by a series of numerical simulations from the aspects of arrangement forms of connectors, structure geometric properties and material properties of wall. And the ultimate bearing capacity, failure mode, load-displacement curve and the equivalent plastic strain (PEEQ) were carried on the comprehensive comparison and analysis. The results indicate that reducing distance of connectors and depth-thickness ratio of the wall, increasing height-width ratio and the vertical uniform load and improving the masonry compression strength can effectively improve the initial out-of-plane stiffness and bearing capacity of outer longitudinal wall. And the depth-thickness ratio, height-width ratio and masonry compression strength were the important factors of affecting the out-of-plane mechanical performance of outer longitudinal wall, while the effect of vertical uniform load is limited. Besides, when the smaller the depth-thickness ratio and the greater the height-width ratio, the effect of improving the out-of-plane bearing capacity of outer longitudinal wall by reducing the distance of connectors on columns was more obviously. However, the change of distance of connectors on beams made nearly no sense to the out-of-plane bearing capacity. In addition, on the one hand, when the height-width ratio was too large, which may lead to the increase of stiffness so as to weakening the ductility of the wall. On the other hand, if the height-width ratio is too small, then the out-of-plane bearing capacity of the wall will be insufficient. Therefore, in practical engineering, comprehensive factors should be considered to control the depth-thickness ratio and height-width ratio of outer longitudinal wall within a certain limits. Finally, based on the finite element calculation results, the suggested calculation formula of out-of-plane bearing capacity of outer longitudinal wall, which was under the action of uniformly distributed load, was fitted out. And the formula whose rationality has been verified can provide reference for the evaluation of bearing capacity in the practical engineering.