Study On Selection Of Mountainous Structure Embedded End And Related Problems

Mountain building structures have non-peripheral restraint basements,and whether the roof of the basement can be used as the embedded end of the superstructure is worth studying.In this paper,with Open Sees finite element analysis software,a three-dimensional model of pile-soil-structure is established for comparison with the Satwe non-soil embedded model.Mainly considering the slope,the number of layers of the upper frame,different soil conditions,different surrounding soil conditions and other influencing factors,comparative analysis of the structural displacement angle,lateral stiffness ratio,torsion angle,floor shear,overturning bending moment,and Design suggestions are given for setting the basement ceiling as the embedded end.The main conclusions of this paper through analysis and research are as follows:(1)After considering the soil-structure interaction,the natural vibration period of the Open Sees model with four perimeter constraints is significantly longer than that of the non-soil embedded model,and the value also becomes larger.(2)The number of layers of the upper frame of the basement frame structure of the non-peripheral constraint of the mountain structure has no obvious influence on the judgment of the embedded end.(3)Different slopes have obvious effects on structural deformation and internal force,and the smaller the slope(that is,the larger the contact area between the slope and the retaining wall),the closer the displacement angle,stiffness ratio,torsion angle,and floor shear and bending moment of the structure are to the four sides.In the case of soil,it is more advantageous to set the ceiling of the basement as an embedded end.When the soil is plain-filled,the basement roof can be set as an embedded end when three sides are covered with surrounding soil and two sides are covered with surrounding soil.(4)Different soil types have obvious effects on structural deformation and internal forces.The greater the elastic modulus of the soil,the closer the displacement angle,stiffness ratio,torsion angle,and floor shear bending moment of the structure will be to the surrounding soil on all sides.It is more advantageous to set the embedded end.When the slope is diagonally diagonal,in the case of three-sided surrounding soil,when the soil elastic modulus is greater than or equal to 23 MPa,the basement roof can be set as the embedded end;in the case of two-sided surrounding soil,the soil elastic modulus is greater than or equal to 60 Mpa,The ceiling of the basement can be set as an embedded end.(5)In the case of single-sided soil,it is not suitable to set the basement roof as an embedded end under various working conditions.(6)When the slope is diagonally diagonal,the shorter the shear wall on one side of the slope foot,the larger the error value of each parameter is when the three-sided surrounding soil,the two-sided surrounding soil and the four-sided surrounding soil are compared.It shows that the longer the length of the shear wall on one side of the slope toe is,the more advantageous it is for the basement roof to be set as an embedded end.(7)Recommendations for setting the basement ceiling as an embedded end for non-peripheral restrained basement structures in mountainous buildings: The entire basement should have a closed external wall connected to the basement ceiling;the basement ceiling,walls,and columns should meet the corresponding structural requirements;the side without soil constraints should be added The lateral stiffness of the basement structure in this direction.