The Analysis On Coupled Shear-Wall With Construction Joints By The Method Of Finite Element

At present, In the construction process of high-rise building, large formwork construction technology is extensively used, also due to other reasons, a lot of construction joints is leaved to to the structural member. But under earthquake loading, construction joints often become the weak links in the structure, thus affecting the mechanics performance and durability of the structure.At present, much work has been done in the construction phase, reinforcement adopted to the construction joint, as well as remediation measures, have had more understanding, but the theoretical research is not enough, and the research on load transfer mechanism of the construction joint is still in its initial stage, the construction joint load transfer mechanism and reasonable model, as well as research on the affection of variety of remedies and reinforcement measures, is not enogh, so,the content is the main content of this paper.According to the existing problems of the structure of high-rise building shear wall large formwork construction technology of, summrized the existing research on construction joint, analysised the force transmission mechanism of construction joint, proposed a new refined model of construction joint, studied the features of the numerical software and the application skills of it.Because there were no system knowledge on construction joint stress mechanism and mechanical properties,as well as other aspects of this theory, this paper tries to explore the construction joint stress mechanism and mechanical properties, and combined with research on the existing the interface of concrete,also research on friction, whereby the contact algorithm were selected to simulate the construction joint unit, through the numerical simulation result of coupling beam with the construction joints (and the friction coefficient is set to1.0) and without a construction joint model, for the comparative analysis of the calculation results are in good agreement;and when the construction joint contact surface were set with different friction coefficients, the internal force distribution of the beam showed a significant changes, thus confirming that the use of contact algorithm to analyze the coupling beam construction joint problems,were of reliability and accuracy,also confirmed that the units, material parameter, failure criterion, the convergence criterion and so on, all these selected,were of reliability, thereby providing a good supporting to the following study.Under the above research above, this article through numerical calculation of several beams in conventional loads, coupling beam with construction joints and coupling beam without construction joints are compared, in these aspects,such as,the stress distribution, fracture distribution and so on,the influence degree of construction joints on the mechanical properties of coupling beam,are preliminary gave. Then, through research on four coupling beams with construction joints, by changing friction coefficient of the contact surface, thus to analyze the interface of concrete with construction joints of beams on the mechanical properties of. Then, through research on beams that with construction joint,but construction joint were set at different position, inorder to get the proper position on the coupling where the construction joint should be set to. the the coupling beams are arranged in different parts of in two groups of samples, to consider the reasonable retaining position of construction joints. Finally, through two groups of samples of the coupling beams with different additional reinforcement, one with additional Diamond Bar, while the other with additional Diagonal Bars, to consider the influence on the mechanical properties of coupling beam with construction joint,which is caused by different reinforcement style, intended to get a better reinforcement of coupling beams,with construction joints.This paper focuses on research of the reasonable model of construction joint force, the application of contact algorithm in study of construction joint problem, as well as research on the effectiveness of various remedial measures to construction joints. Through the comparative analysis, it showed that:when the position of construction joint is changed, the friction coefficient is enlarged, additional reinforcement with the style of diamond was adopted, the mechanical properties of the coupling beam got a certain amount of increase.To some extent, revealed the influence degree of the construction joints to the coupling beams, and the reasonable reinforcement style, reasonable position where the construction should be seted, and the importance of the friction coefficient to the coupling beam with construction joint, which is on the surface of the construction joint, got more reasonable results about the construction joints. For the research on high-rise building of the related research, the paper has much profauding meaning,can provide certain reference.