In this paper, a prerequisite for “Reuse System” is that building materials finish the design of the reuse part before production. This use is temporary space, indoor exhibitions, the store in commercial facilities. The characteristic of existing reuse systems are “lightness”, “rapidity” and “simplicity”, but existing reuse systems is not combined “The kind of the use material is minimized” with “The use material is convert to a wide variety of structural shape”.
To solve this problem, I propose Crescent System. Crescent System is the structure that Crescent Parts were connected by the arms. The joint of Crescent System combines “Mobile joint with the arms” and “Unbonding joint with Crescent Parts”. Crescent Part is Aluminum extrusions, this basic shape is crescent-shape that was made in Major arc and Minor arc. This change of basic shape affects the small dimensions of Crescent System. I made the miniature. As a result of this, a wide variety of shape was able to formed by the arms and Crescent Parts only. This Crescent System was stable by the installation of the strings. This stable structure is String Crescent Structure (SCS). I did an experiment and analysis to study structure behavior of SCS. As a result of this study, the knowledges were shown below.
*Shear transfer mechanism between Crescent Parts:
(Non-
separating) The tensions of the strings does not occur, and the bearing stress occur.
(After
separating) The tensions of two strings reduce the separating between two Crescent Parts, and bearing stress increase.
*Bearing moment transfer mechanism between Crescent Parts:
(Non-slackness) Compression force occurs to one string, and tension force to the other string. Bearing stress between two Crescent Parts is small.
(After slackness) Slackness occurs to one string, and tension force of the other string increase. Bearing stress between two Crescent Parts increase too.
*The change of Crescent part-shape influences compared rigidity, compression stress of the string and Crescent Part.
*The selection of the hollow structure for Crescent Part influences the rigidity of SCS.
*A mechanical role of arms contact to the bolts is only the reduction of deformation.
*A mechanical role of the prestress of the strings is prevention of deformation by slide, stabilization of structural behavior and the increment of the rigidity and the load for the slackness of the strings.
The direct joining between Crescent Parts is "Unbonding joint" to permit siding and separating. As a result, I expected that SCS shows the structure behavior different from the elastic continuum, and put the case that the experimental value is different from the analysis value. However, the experimental value accorded with the analysis value in “Load-displacement” and “Load-tension of the string”.
The challenges for the future are as follows. When SCS is applied into a an arched form, the two material axes of Crescent Parts are not aligned in a straight line. This geometric problem may influence rigid reduction, the increase of the stress. To prepare for this, I examine the appropriate value of the rigid ratio of each material for Crescent Part. The change of the prestress installation process influences the position and the size of friction and the contact in "Unbonding joint". This phenomenon may make the prestress control difficult. To prepare for this, It is necessary to study the prestress installation process and joint detail of the string. These problem solution is the condition of the utility improvement of Crescent System.
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