Improving double-layer space trusses collapse behavior by strengthening compression layer and weakening tension layer members

Rashidyan, Saman; Sheidaii, Mohammad Reza

doi:10.1177/1369433217693631

Cited by 9 publications

(18 citation statements)

References 9 publications

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“…Due to the recent failures of progressive collapse in DLST structures, several researchers are working on ways to improve the performance of the space truss behaviour by achieving a much smoother and ductile response of the structure. The results by [6] show that the method of strengthening the compression layer members along with weakening the tension layer members is an effective method for retrofitting the DLST behaviour against progressive collapse. [7] highlighted that material and geometric nonlinearities are important factors to be considered in the collapse behaviour of space truss structures.…”

Section: Novel Soft Membermentioning

confidence: 99%

Novel soft members in double-layer space trusses

2019

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Progressive collapse of space structures has received much attention in recent years due to the recent failure of a double-layer space truss (DLST) stadium in Terengganu, Malaysia which collapse twice in Year 2009 and 2013. There is a considerable interest in understanding the collapse behaviour of space structures and possibility of improving its collapse behaviour. This phenomenon was demonstrated by earlier researchers, such as Collins (1981) and Parke (1988) which investigated the collapse behaviour both theoretically and experimentally. In their study a carefully designed DLST structure may possess reserve of strength in excess of their elastic capacity. Although DLST have a high degree of statically degree of statically indeterminacy, not all of them are robust, as it has been found a loss of one critical member could trigger the collapse of the entire structure. Usually the collapse of the DLST is influenced by the ductility behaviour of the compression members. The aim of this study was to investigate the use of novel soft member to reduce the catastrophic progressive collapse behaviour of DLSTs. A novel soft member was constructed to measure its behaviour under tensile and compressive loads. The term novel soft member used in this study is referred to a combination of three circular tubes which is made into one component and is used to support compressive load. It was found that using a blend of three circular tubes significantly increase the ductility behaviour of the member. These test illustrates that while the inner and outer tube experience compressive forces, the middle tube will continue to increase linearly. This indicates that there is a possibility of improving the collapse behaviour of DLST by incorporating the novel soft member.

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Section: Novel Soft Membermentioning

confidence: 99%

Novel soft members in double-layer space trusses

2019

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“…The vertical eccentricity E2 is proportional to the angle ϕ, being equivalent to the correction distance d. Figure 8 shows that the measurement of d2 is equal to 5t1 of the pipe wall thickness (flange) Several other collapses in 3D trusses have been observed in the world. However, the ranges of space truss structures have been reevaluated and some have been strengthened in recent years [61][62][63][64][65][66][67][68][69][70], thanks to increasingly robust computer systems and commercial Finite Element Method (FEM) programs and complex nonlinear analyses [10,30,56,[71][72][73][74][75][76][77][78][79][80][81][82].…”

Section: Correction Of Eccentricity In Typical Connectionsmentioning

confidence: 99%

Experimental Analysis of Space Trusses Using Spacers of Concrete with Steel Fiber and Sisal Fiber

Silva

Bezerra

et al. 2020

Materials

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Space trusses are structural systems, generally made of tubes, used worldwide because of their advantages in covering long-span roofs. In addition to having a low cost, the truss weight is relatively reduced. The load capacity of these structures depends also on the strength of their node connection. Connections made with the superposition of flattened tube ends trespassed by one bolt are, generally, known as typical nodes. They are inexpensive but present eccentricities that reduce significantly the strength of such space trusses. To increase the truss load capacity, this research presents the results of an experimental program to reduce the eccentricities of the typical nodes. This reduction is done with a new type of spacer made of encapsulated concrete with steel fiber or sisal fiber. The experimental tests showed that the trusses with typical nodes collapsed under reduced load by local failure due to high distortions at the nodes. The trusses with encapsulated concrete spacer showed good results, with an increase in collapse load of 36% and failure by buckling bars.

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“…This delays the failure of the compression members and consequently a good level of ductility will be provided [4]. A comprehensive study regarding this method is conducted by Rashidyan and Sheidaii [10].They used this method on five DLST models with various conditions. They showed that 30%-40% overdesign of all top and under design of bottom members results in satisfactory ductility level and load bearing capacity in their investigated models.…”

Section: Introductionmentioning

confidence: 99%

“…Second, DLSTs with overall collapse behavior having different member imperfection and FLD activation level are analyzed to examine the effect of such factors on the effectiveness of using FLDs. In the end, the results of this study were also compared to another retrofitting method called the method of over designing the members of compression layer and under designing the members of tension layer to improve the collapse behavior of flat DLSTs suggested by Rashidyan and Sheidaii [10]. Since the DLST models used in both studies are the same, the comparison of the results can help obtaining more insight regarding the effectiveness of installing FLDs on DLSTs.…”

Section: Introductionmentioning

confidence: 99%

Retrofitting Collapse Behavior of Double Layer Space Trusses Against Progressive Collapse by Force Limiting Devices

2022

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Previous collapses of Double Layer Space Trusses (DLSTs) show that they are vulnerable to progressive collapse phenomenon. Under certain circumstances, a local failure can propagate throughout the structure and lead to occurring a brittle failure in the structure. Therefore, it is crucial to identify and exploit proper retrofitting methods against progressive collapse in DLSTs. In the current study, the method of utilizing Force Limiting Devices (FLDs) to improve the collapse behavior against progressive collapse have been investigated for flat DLSTs with overall collapse and dynamic snap-through. The results show that introducing FLDs to the critical members of the top layer of a flat DLST with dynamic snap-through failure mode and a member imperfection of 0.005L provides 18.2 to 23.86% load bearing increase and ductility between 1.55 to 1.67. The results also show that when the DLSTs is made of members with geometric imperfections between 0.001 L and 0.004 L, the FLDs can convert the overall collapse of the DLSTs to a ductile collapse. For this member imperfection range, the obtained data show that the method can increase the load bearing capacity of the models from 18.35to 26.8% and provide ductility between 1.56 to 1.76. The provided ductility in models with smaller member imperfection is slightly greater than those provided in models with larger member imperfection. In the current study the activation level of FLDs are selected between 85 to 95 percent and the effect of FLD activation level is also investigated. In addition, the results showed that placing FLDs on critical members could provide a ductility significantly greater than the ductility provided by another method of retrofitting DLSTs called the method of over designing the members of compression layer and under designing the members of tension layer.

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Improving double-layer space trusses collapse behavior by strengthening compression layer and weakening tension layer members

Cited by 9 publications

References 9 publications

Novel soft members in double-layer space trusses

Novel soft members in double-layer space trusses

Experimental Analysis of Space Trusses Using Spacers of Concrete with Steel Fiber and Sisal Fiber

Retrofitting Collapse Behavior of Double Layer Space Trusses Against Progressive Collapse by Force Limiting Devices

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