Study On The Arrangement And Effect Factors Of Reasonable Quantity Of Shear Walls In Tall Shear Wall Structures

In actual projects, the arrangement of walls and selection of sections are usually completedby the experience of designers, and the design often tends to be on the conservative side inconsideration of the security and design cycle, this leads the bearing capacity of shear wallsused inadequately. Therefore, it is significant to investigate the arrangement method andreasonable quantity of shear walls in tall shear wall structures.At present, the study of arrangement method and reasonable quantity of shear walls aremainly based on the theory of structure optimization, the proposed methods are exceedinglycomplex and hard to be used in actual projects. Calculation and analysis are conducted on twoengineering examples used SATWE and Midas Gen in this paper, and the reasonablearrangement methods and the factors influenced quantity of shear walls are investigated.Themain contents and results are as followed:Based on an actual project example, Comparative analysis of structural dynamiccharacteristics, deformation and the consumption of concrete through changing the arrangementof shear walls is conducted with SATWE. The results indicate that the reversing stiffness can beimproved through enlarging the thickness of surrounding shear walls and the height ofsurrounding beams. From scheme1to scheme2, the structural cycle ratio reduces by2.62%, thefirst reversing cycle reduces by3.75%, the interlayer displacement ratio of X direction reducesby0.9%, and Y direction reduces by1.64%. At the same time, the rigidity and distribution ofstructures can be more reasonable through weakening the inner shear wall, then making thestructure more safe and economic. From scheme1to scheme3, the structural cycle ratio reducesby5.13%, the first reversing cycle reduces by0.62%,the interlayer displacement ration of Xdirection reduces by3.45%, Y direction reduces by3.28%, and the consumption of concretereduces275.72m3.This method can supply reference to similar engineering designs.According to an actual project example, first,using the arrangement methods of the wallmentioned in the last part to optimize the project.Then,as the arrangement methods of the wall remain unchanged,apply Midas Gen to bulid the model and calculate,changing the punchingrate, thickness and concrete strength of shear walls, analysing the changes of structural vibrationperiod, the maximum interlayer displacement angle, seismic shear, the stiffness-weightratio,shear-weight ratio and steel consumption quantitatively. And investigating the impact ofthe three factors on the reasonable quantity of shear walls.The results indicate that:while theopen hole rate increases respectively by47.8%、102.6%、138.3%,the variation of structuralvibration period and the maximum interlayer displacement angle is more than that of theseismic shear.While the thickness of the wall increases respectively by10%、25%、40%, thevariation of structural vibration period and the maximum interlayer displacement angle is lessthan that of the seismic shear and both of them have relatively large impact on the lateralstiffness of the structure. It is not that the higher of the open hole rate,the less of the steelconsumption.The steel consumption is increasing with the thickness of the wall, but theamplification of them is not consistent.The concrete strength grade has relatively weak impacton the lateral stiffness of the structure and steel consumption.We can apply relevant methodsand theories to optimize the design in similar projects.