Method for determining allowable value of member length error and verification method for cable-strut pretension structure

Abstract

The invention discloses a method for determining the allowable value of a rod length error and a method for verifying a cable-rod pretension structure. A method for determining the allowable value oflength error comprises the follow steps: (1) determining a search space of the allowable value of length error; (2) Iterative calculation of the allowable value of the length error of the searching structural members. The method for verifying the cable-strut pretension structure comprises the following steps: A, classifying the struts according to the topological relationship and the geometrical characteristics; B, determining the allowable value of the corresponding length error of the structural bar; C. checking calculation: judging whether the structure meets the requirements of the normalservice limit state of the maximum deflection. The method for determining the allowable value of the rod length error provided by the invention can reduce the requirement for the allowable value of the rod length error in a reasonable range, thereby greatly reducing the requirement for machining accuracy and the manufacturing cost. The pretension verification method of the cable rod provided by the invention can effectively determine the reliability degree of the cable rod pretension and ensure the structural safety.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and more specifically relates to a method for determining the allowable value of the length error of a rod and a verification method for a cable-strut pretension structure. Background technique [0002] The cable-strut pretension structure is a kind of space flexible pretension structure system composed of cables and compression rods. Since this system makes full use of the advantages of high strength of cables and controllability of pretension, the structure has light weight, The characteristics of large span and good economic performance are the research hotspots and future development directions of spatial large-span structures at home and abroad at this stage. The overall stiffness of the system is formed with the completion of the stretching process. Before the stretching forming, the system is in a relaxed state, and the stiffness is zero. It needs to pass a suitable stretching sc...

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method for determining the allowable value of the length error of a member and a method for verifying the cable-strut pretension structure. Different length error sensitivity characteristics, based on the reliability theory, determine the error allowable value corresponding to different rods of different cable-strut pretension structure types, and carry out the cable-strut pretension structure verification within the error allowable value range, so as to avoid unnecessary Accurate requirements to reduce industrial costs, thereby solving the technical problems that the existing cable pretension structure adopts the same accuracy requirements for all rods and cables, resulting in high industrial costs and serious waste

Images