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CN-121997675-A - Double-index-based bolt spacing and arrangement optimization design method

CN121997675ACN 121997675 ACN121997675 ACN 121997675ACN-121997675-A

Abstract

The invention relates to the field of structural design of assembled concrete shear walls, and particularly discloses a prefabricated wallboard bolt spacing and arrangement optimization design method based on double indexes and a computer implementation method thereof. The method first inputs engineering information and target performance index. And then, calling a response surface or regression model which is established in advance based on experiments and finite element parameter analysis, carrying out bolt arrangement optimization on sections with different heights and vertical and horizontal seam partitions by taking the minimum total number of bolts of each prefabricated wallboard as an objective function, obtaining a bottom-up encryption-decryption configuration scheme, and outputting a plurality of sets of recommended schemes according to economical or ductile preference. The invention can be realized as a structural design software module or a building design system, and can explicitly balance the steel material consumption and the lateral movement control of the structure on the premise of meeting the earthquake resistance, thereby improving the accuracy, rationality and automation level of the bolt connection design of the prefabricated shear wall.

Inventors

  • HUANG YUAN
  • LIU ZUQIN

Assignees

  • 湖南大学

Dates

Publication Date
20260508
Application Date
20260316

Claims (8)

  1. 1. A prefabricated wallboard bolt spacing and arrangement optimization design method based on double indexes is characterized by comprising the following steps of 1) obtaining engineering input parameters including earthquake fortification intensity, floor number, layer height, structural length-width ratio, typical wall limb height-width ratio, axial pressure ratio range, design concrete strength, dense rib arrangement parameters and prefabricated wallboard types, and 2) obtaining target performance indexes including bearing capacity reduction ratio lower limit Upper limit of the interlayer displacement angle 3) Calling a pre-established performance response surface or regression model, wherein the response surface represents the number of bolts Spacing of bolts Ratio of reduction of bearing capacity Maximum interlayer displacement angle The relation between the two comprises at least: , , wherein, Is the height-width ratio of the wall limbs, For the number of floors to be used, In order to achieve the axial-pressure ratio, For the height of the structure, For structural aspect ratio, 4) for each prefabricated wall panel, establishing a total number of bolts The minimum is an optimization model of an objective function, and under constraint conditions And 5) outputting bolt arrangement densities of all the prefabricated wallboards in different height intervals and bolt configuration schemes of vertical joints and horizontal joints respectively according to the optimization result.
  2. 2. The method of claim 1, wherein the method for establishing the performance response surface or regression model in step 3 comprises 1) selecting the number of bolts, the distance, the height-width ratio of the wall, the shaft-to-pressure ratio, the existence of vertical joints, the reinforcement ratio and the like as independent variables based on the full-scale test or the reduced-scale test result and the finite element parameter analysis result, fitting by taking the bearing capacity reduction ratio and the hysteresis energy consumption index as the dependent variables, 2) constructing by adopting a polynomial regression, radial basis function, neural network or multi-element response surface method 3) Selecting the floor number, the layer height, the fortification intensity, the prefabrication rate, the connection rigidity and the like as independent variables based on the time course analysis result of the multi-layer assembled shear wall structure, and fitting by taking the maximum layer displacement angle as the dependent variable 4) Carrying out regional modeling on the response surface according to structural characteristics such as whether vertical joints are arranged on the wall limbs, whether horizontal post-cast strips are arranged or not, and the like.
  3. 3. The method according to claim 1 or 2, wherein the optimization solution in step 4 is at least one of 1) discretizing the bolt spacing within the rule-allowed interval, enumerating a combination of the number of bolts meeting the construction requirement at each candidate spacing, and rapidly calculating the corresponding by calling the response surface And (3) with Screening solution sets meeting constraint conditions, selecting the combination with the minimum total number of bolts from the solution sets, 2) optimizing the solution sets in a continuous design variable space by adopting a gradient method, a sequence quadratic programming or a heuristic intelligent algorithm, 3) introducing a comprehensive objective function taking steel consumption and ductility indexes as weights on the premise of meeting the constraint of bearing capacity and side-shifting performance, and performing multi-objective optimization to form the pareto solution sets.
  4. 4. The method according to any one of claims 1-3, wherein each prefabricated wallboard is divided into a plurality of arrangement sections along the height direction, the arrangement sections at least comprise a plurality of layers of encryption areas at the bottom, a transition area at the middle and a reduction area at the upper part, and the step 4 is characterized in that bolt spacing and quantity variables are respectively arranged at the section level, and the bolt arrangement of each section is jointly optimized under the additional constraint of ensuring the integral deformation coordination.
  5. 5. The method according to any one of claims 1 to 4, wherein the output result in step 5 at least includes 1) a recommendation for saving steel, characterized in that 、 The method comprises the following steps of (1) on the premise of minimum total bolts, 2) on the premise of improving ductility and energy consumption, the recommended scheme is characterized in that ductility coefficients or hysteresis energy consumption indexes are maximized under the condition of regulating the upper limit of steel consumption, and 3) on the premise of standard checking, the recommended scheme is characterized in that bolt distribution is optimized moderately on the basis of not lower than standard recommended configuration.
  6. 6. A computer device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, wherein the processor implements the prefabricated wall panel bolt spacing and arrangement optimization design method of any one of claims 1-5 when executing the computer program.
  7. 7. A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the prefabricated wall panel bolt spacing and arrangement optimization design method of any one of claims 1-5.
  8. 8. The building structure design system is characterized by comprising a structure modeling module, a response surface calling module, an optimization solving module and a result output module, wherein the structure modeling module is used for building an assembled shear wall structure model according to engineering input parameters and identifying each prefabricated wall plate unit, the response surface calling module is used for searching a bearing capacity reduction ratio and interlayer displacement angle response surface or regression model corresponding to the type and design parameters of the prefabricated wall plates from a preset database, the optimization solving module is used for carrying out optimization solving on the number and the distance of bolts of each prefabricated wall plate under the condition of target performance indexes and standard constraint conditions set by users, and the result output module is used for generating a design result file comprising a bolt layout diagram, a construction parameter table and a recommended scheme set of each prefabricated wall plate.

Description

Double-index-based bolt spacing and arrangement optimization design method Technical Field The invention relates to the field of earthquake-resistant design of assembled concrete structures, in particular to an optimization design method for the bolt spacing and arrangement of prefabricated shear wall plates based on double indexes of bearing capacity reduction ratio and structural side-shifting performance, and a corresponding computer program, computer equipment and a building structure design system. Background The assembled shear wall structure has been widely used in houses and public buildings due to the high industrialization degree, high construction speed and easy quality control. The prefabricated shear wall boards are commonly connected through grouting sleeves, slurry anchor lap joints or high-strength bolts (plates) and the like to realize stress transmission and integral cooperation. The prefabricated wallboard structure adopting the dry connection modes such as the high-strength bolts, the end plates, the connecting angle steel and the like has the advantages of being replaceable, repairable and high in assembly precision, and is more and more paid attention to. In the prior art, a great deal of experimental study and numerical analysis work are carried out on the anti-seismic performance of the connecting node of the assembled shear wall, and the anti-seismic performance of the connecting node relates to factors such as a connecting form, a reinforcement structure, a bolt strength grade, a vertical joint and a horizontal joint structure. The influence of parameters such as bolt spacing, number and the like on the stress performance of the combined shear wall or the steel plate wall is also researched, and the conclusion that the denser the bolts, the higher the bearing capacity and rigidity, the certain change trend of ductility and the like are given on a test layer or a finite element layer. However, these studies have focused on the evaluation of the mechanical behavior of individual test pieces or local connection structures, and have not resulted in engineering-oriented systematic methods and software tools that can be used directly for bolt placement optimization. From the aspect of standardization and standard, the current national and local standards mostly adopt empirical rules for the design of the prefabricated wallboard connecting bolts, such as providing the maximum and minimum values of bolt spacing and side margin, and the requirements of constructing encryption area range and minimum number, and part of the rules propose a simplified design method adopting an equivalent integral wall, so that prefabricated wallboard components and connection thereof are more approximate to actual stress, but still stay mainly on the aspect of construction limit values and integral reduction coefficients, and a quantitative design-optimization flow taking bearing capacity reduction ratio and structural interlayer displacement angle as core indexes is not established. In the aspect of patents, various designs and construction methods of assembled shear wall connection structures are disclosed, such as a design method for a replaceable steel connection structure, an assembled shear wall building structure based on BIM, a construction method and the like. The technical scheme generally focuses on the construction form, the assembly flow and the information integration of the connecting nodes, the number and the spacing of bolts are calculated according to standard experience or construction requirements, and the relation of the bearing capacity reduction ratio, the number of bolts and the spacing of bolts obtained by test and finite element analysis and the relation system of the interlayer displacement angle, the floor number and the fortification intensity are not integrated into a bolt arrangement design method. Specifically, the prior art has at least the following disadvantages: the bolt arrangement lacks performance-oriented quantitative optimization-in engineering practice, designers typically choose the pitch and number of tie bolts empirically or analogically within the specification allowed, or by a limited number of manual trial-and-error adjustment schemes. With the improvement of the prefabrication rate and the diversification of the connection form, the empirical selection method is difficult to compromise the bearing capacity reduction, the ductility and the overall interlayer displacement control of the structure, and local overservice or potential weak links are easy to occur. The existing research reveals the influence rule of bolt parameters on the prefabricated wallboard bearing capacity reduction ratio, and indicates that the phenomena of 'marginal effect reduction', 'optimal interval', and the like exist, but the existing research is not combined with the time course analysis result of the multi-layer assembly type wallboard structure, and the requirements of bearing capacit