Mechanical Behavior Study Of Double Coupling Beam With High-strength Steel And High-strength Concrete

The key to enhance the ductility of coupling beam is To maximize the double shear wall structure seismic ability. Double coupling beam which is a single beam deco mposed into two can solve the problems of small- span-to-depth-ratio coupling beam over reinforced, and opening hole for equipments, it also can be used to meet the requirements of performance design. Shear wall of high-strength steel and high-strength concrete is are well studiedy in our country, but the double coup ling beam with high-strength steel and high-strength concrete is short of study.In this paper, the SATWE are used to analysis single coupling beam and double coupling beam effects on the overall structure.Then,the ANSYS software are used for mechanical behavior study of double coupling beam with HRB500 bars and high-strength concrete using entity modeling method for finite element numerical simulation analysis. Considering the concrete strength grade, ratio of longitudinal reinforcement, stirrup rate, span depth ratio, slit height and position of slot on the mechanical properties of the structure. Finite element model is established for 17 specimens, the thorough analysis of the ductility of the structure under the monotonic horizontal loading, the bearing capacity and cyclic loads of hysteretic curve and skeleton curve, stiffness degradation performance.Conclusion was obtained through calculation analysis:Double coupling beam increase the ductility of the whole structure comparing to single coupling beam,the internal force and stiffness are reduced accordingly.concrete strength, longitudinal reinforcement ratio, span-to-depth-ratio and slit height significant impact on the configuration of the double coupling beam with HRB500 bars and high-strength concrete: concrete strength grade should not be too high or too low, Suggestions about the strength of the concrete is generally choose C60 and C70; longitudinal reinforcement ratio should not be too high or too low, it is recommended that the ratio should be in the range of 1.79%- 2.26%; different than coupling beam slits forming double coupling beam designed to consider ductility, bearing capacity and energy performance are different, the actual project should be reasonably configured according to the actual situation; the influence of stirrup ratio for component capacity is not as big as a member of the effects of the above factors, but the form of stirrups has a great impact on bearing capacity and energy performance, it is recommended stirrups should be unifor m arranged in the seismic design of structure; reasonable structure of slotted height has an important influence on the ductility and energy dissipation of performance, the opening slit and slitting height in the actual project how much it is undesirable, suggest to take 100 mm;upper or lower slotted member's hysteretic performance than slotted middle member, the bearing capacity of relative also, so it could be slotted a down position according to the actual situation in the design.