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RISS 인기검색어
- 검색키워드
- 저자 : Nadim Wehbe (검색결과 4 건)
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Nadim Wehbe,Chad Stripling 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.3
This paper examines the flexural behavior of prestressed Self-Consolidating Concrete (SCC) bridge I-girders when subjected to monotonic and cyclic loading. Three full-scale prestressed bridge girders were constructed with limestone aggregate concrete and tested until failure. One of the girders was made with Conventional Concrete (CC) and served as a control specimen, while the other two girders were made with SCC. The girders were fitted with composite CC thickening over the top flange to represent composite bridge decks. The control girder and one of the SCC girders were subjected to monotonically increasing load until failure. The remaining SCC girder was subjected to a sequence of cyclic loads with increasing load amplitudes until failure. The results show that prestressed SCC and CC bridge girders exhibit similar flexural stiffness and strength and that the current code methods for determining transfer length, effective prestress, flexural strength, and flexural stiffness can be used for prestressed SCC girders.
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Wehbe, Nadim,Bahmani, Pouria,Wehbe, Alexander Korea Concrete Institute 2013 International Journal of Concrete Structures and M Vol.7 No.1
The use of light-gauge steel framing in low-rise commercial and industrial building construction has experienced a significant increase in recent years. In such construction, the wall framing is an assembly of cold-formed steel (CFS) studs held between top and bottom CFS tracks. Current construction methods utilize heavy hot-rolled steel sections, such as steel angles or hollow structural section tubes, to transfer the load from the end seats of the floor joist and/or from the load-bearing wall studs of the stories above to the supporting load-bearing wall below. The use of hot rolled steel elements results in significant increase in construction cost and time. Such heavy steel elements would be unnecessary if the concrete slab thickening on top of the CFS wall can be made to act compositely with the CFS track. Composite action can be achieved by attaching stand-off screws to the track and encapsulating the screw shank in the deck concrete. A series of experimental studies were performed on full-scale test specimens representing concrete/CFS flexural elements under gravity loads. The studies were designed to investigate the structural performance of concrete/CFS simple beams and concrete/CFS continuous headers. The results indicate that concrete/CFS composite flexural elements are feasible and their structural behavior can be modeled with reasonable accuracy.
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Behavior of Concrete/Cold Formed Steel Composite Beams
Nadim Wehbe,Pouria Bahmani,Alexander Wehbe 한국콘크리트학회 2013 International Journal of Concrete Structures and M Vol.7 No.1
The use of light-gauge steel framing in low-rise commercial and industrial building construction has experienced a significant increase in recent years. In such construction, the wall framing is an assembly of cold-formed steel (CFS) studs held between top and bottom CFS tracks. Current construction methods utilize heavy hot-rolled steel sections, such as steel angles or hollow structural section tubes, to transfer the load from the end seats of the floor joist and/or from the load-bearing wall studs of the stories above to the supporting load-bearing wall below. The use of hot rolled steel elements results in significant increase in construction cost and time. Such heavy steel elements would be unnecessary if the concrete slab thickening on top of the CFS wall can be made to act compositely with the CFS track. Composite action can be achieved by attaching stand-off screws to the track and encapsulating the screw shank in the deck concrete. A series of experimental studies were performed on full-scale test specimens representing concrete/CFS flexural elements under gravity loads. The studies were designed to investigate the structural performance of concrete/CFS simple beams and concrete/CFS continuous headers. The results indicate that concrete/CFS composite flexural elements are feasible and their structural behavior can be modeled with reasonable accuracy.
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Field distribution factors and dynamic load allowance for simply supported double-tee girder bridges
Brian Kidd,Sandip Rimal,Junwon Seo,Mostafa Tazarv,Nadim Wehbe 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.1
This paper discusses the field testing of two single-span double-tee girder (DTG) bridges in South Dakota to determine live load distribution factors (LLDFs) and the dynamic load allowance (IM). One bridge had seven girders and another had eight girders. The longitudinal girder-to-girder joints of both bridges were deteriorated in a way that water could penetrate and the joint steel members were corroded. A truck traveled across each of the two bridges at five transverse paths. The paths were tested twice with a crawl speed load test and twice with a dynamic load. The LLDFs and IM were determined using strain data measured during the field tests. These results were compared with those determined according to the AASHTO Standard and the AASHTO LRFD specifications. Nearly all the measured LLDFs were below the AASHTO LRFD design LLDFs, with the exception of two instances: 1) An exterior DTG on the seven-girder bridge and 2) An interior DTG on the eight-girder bridge. The LLDFs specified in the AASHTO Standard were conservative compared with the measured LLDFs. It was also found that both AASHTO LRFD and AASHTO Standard specifications were conservative when estimating IM, compared to the field test results for both bridges.
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