195 research outputs found
The Performance and Economic Evaluation for Fire and Seismic Resistant Steels
ꡬ쑰물μ λ°μν νμ¬λ ꡬ쑰λΆμ¬μ λ΄λ ₯μ μ νμν€κ³ , λ λμκ° λΆκ΄΄λ₯Ό μ λ°νκ² λλ€. μ΅κ·Όμ κ΅λ΄ νμ¬μΆμ΄μ μ΄λνν λ° μ΄κ³ μΈ΅νκ° λκ³ μλ 건μΆλ¬Ό λν₯μ 볡ν©μ μΌλ‘ κ³ λ €νλ©΄ μμΌλ‘ λμ± ν° κ·λͺ¨μ νΌν΄λ₯Ό μ λ°ν κ²μΌλ‘ νλ¨λλ€. μ΄μ κ°μ λ°°κ²½κ³Ό λλΆμ΄ μ§μ§, κ°ν, νμ€ λ±μ μ¬ν΄μ λλΉν ꡬ쑰물 μμ μ± ν보λ₯Ό μνμ¬ Hμ¬λ 355MPaκΈ λ΄νγλ΄μ§κ°μ¬λ₯Ό κ°λ°νμλ€.
λ΄νγλ΄μ§κ°μ¬λ κ³ μ¨ μμ ν볡κ°λ μ μ§μ±λ₯κ³Ό μ ν볡λΉλ₯Ό μ립μν¨ κ³ κΈ°λ₯ κ°μ¬μ΄λ€. μ΄λ¬ν κ°λ°κ°μ¬λ μΈμ₯μνμ ν΅ν΄ μ¬λ£μ μΈ μ±λ₯μ λ§μ‘±ν μμ€μ΄λ©°, ꡬ쑰λΆμ¬λ‘ μ¬μ©λλ νκ°λ₯μ λν μ€λ¬Όμ€νμ μ§νλ λ°κ° μμΌλ―λ‘ κ±΄μΆ μ£ΌμλΆμ¬λ‘μμ μ μ© νλΉμ±μ ν보μ μμ©νλ₯Ό μν λ΄νμ±λ₯ λ° κ²½μ μ± νκ°κ° νμνλ€.
μ΄ μ°κ΅¬μμλ μμΉν΄μμ λ°©λ²μ μ΄μ©νμ¬ λ΄νγλ΄μ§κ°μ λ΄νμ±λ₯μ λΆμ¬ λ¨μλ‘ νκ°νμλ€. λ΄νμ±λ₯μ νκ°νλ λ΄νμνμ ꡬννκΈ° μν΄ ABAQUSμ μ΄μλ ₯ν΄μ λͺ¨λΈμ κ°λ°νκ³ , μ΄λ₯Ό κΈ°μ‘΄μ°κ΅¬μ κ²μ¦μ ν΅ν΄ νλΉμ±μ ν보νμλ€. κ°λ°λ μ΄μλ ₯ν΄μ λͺ¨λΈμ ν΅ν΄ λ΄νγλ΄μ§κ° λ° λΉκ΅λμ κ°μ¬μΈ μΌλ° νμκ°μ μ μ©ν μ΄ 36κ°μ λͺ¨λΈμ λνμ¬ ν΄μμ μννμμΌλ©°, κ΅λ΄ λ΄νμνκ·κ²©(KS F 2257-1)μ νμ€μ§μ§λ ₯μ±λ₯ 쑰건μΌλ‘ λ΄νμ±λ₯μκ°μ μ°μ νμλ€. λν, λ΄νμ±λ₯μκ° λΉμμ λ¨λ©΄μ¨λλ₯Ό μΈ‘μ νμ¬ νκ³μ¨λλ₯Ό μ°μ νμμΌλ©°, μ΄λ₯Ό λΆμ¬μ κΈ°λ₯κ³Ό μ¬λ£μ κ΄κ³μμ΄ μΌλ₯ μ μΌλ‘ μ μ©λκ³ μλ κΈ°μ‘΄μ νκ³μ¨λ(538β)μ λΉκ΅νμλ€. μ΄μλ ₯ν΄μμΌλ‘ μ°μ λ λ΄νμ±λ₯μκ° λ° νκ³μ¨λλ₯Ό ν΅ν΄ λ΄νγλ΄μ§κ°μ λ΄νμ±λ₯μ μ λμ μΌλ‘ νκ°νμλ€.
μ°μ λ νκ³μ¨λλ₯Ό λΉμ¬νκ°μ΄μνμ λ΄νμ±λ₯ νκ°κΈ°μ€μΌλ‘ μ€μ νκ³ , νΌλ³΅μ¬λ₯Ό ν¬ν¨ν 2μ°¨μ μ΄μ λ¬ν΄μμ μννμ¬ κ°μ’
λ³ λ΄νμ±λ₯μ νκ°νμλ€. κ·Έλ¦¬κ³ λμΌν λͺ©ν λ΄νμ±λ₯μκ°μ λ§μ‘±νλ μ΅μ νΌλ³΅λκ»λ₯Ό μ°μ νμλ€.|Fire in the structure lowers the strength of the structural member and further causes collapse. Considering the recent trends in domestic fires and building trends that are becoming very large and very tall, it is expected to cause even greater damage in the future. With this background, H corporation developed fire and seismic resistant steels of 355MPa level to secure the structure stability against disaster such as earthquake, strong wind and heavy snow.
Fire and seismic resistant steels are a high performance steel that combines the ability to maintain yield strength at high temperatures with low yield ratio. These developed steels have satisfied the material performance through tensile tests, and since the actual test has not been conducted for the shaped steels used as structural members, it is necessary to evaluate the fire resistance performance and economic feasibility to secure the feasibility of application as a major member and to commercialize them.
In this study, the fire resistance performance of fire and seismic resistant steels was evaluated in member unit using the numerical method. ABAQUSβs thermal stress analysis model was developed to implement fire resistance test to evaluate fire resistance performance, and the validity of the numerical analysis was secured through the verification of the existing study. Through the developed thermal stress analysis model, a total of 36 models using fire and seismic resistant steels and general carbon steels, which are comparative steels, were analyzed, and the fire resistance performance time was calculated under the load bearing performance of the domestic fire resistance test standard (KS F 2257-1). In addition, the critical temperature was calculated by measuring the cross-sectional temperature at the time of fire resistance time and compared with the existing critical temperature(538β) which is applied uniformly regardless of the function and material of the member. The fire resistance performance of the fire and seismic resistant steels was quantitatively evaluated through the fire resistance time and limit temperature calculated by thermal stress analysis.
The calculated critical temperature was set as a criterion for evaluating the fire performance of the non-load heating test, and the fire performance of each steel type was evaluated by performing two-dimensional heat transfer analysis including fireproofing protection. And the optimum coating thickness which satisfy the same target fire resistance time.λͺ© μ°¨ β
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μ΄ λ‘ xi
μ 1μ₯ μ λ‘
1.1 μ°κ΅¬λ°°κ²½ λ° λͺ©μ 1
1.2 μ°κ΅¬λν₯ 6
1.3 μ°κ΅¬λ΄μ© λ° λ²μ 9
μ 2μ₯ νκ³μ¨λλ²
2.1 Eurocode 3 11
2.2 κ΅λ΄ λ΄νμ€κ³κΈ°μ€ 16
2.3 κ³ μ°° 20
μ 3μ₯ μμΉν΄μ λͺ¨λΈ κ°λ°
3.1 μ΄ν΄μ λ°©λ² 21
3.2 μ΄μ λ¬μ΄λ‘ 24
3.2.1 μ μμν μ΄μ λ¬λ°©μ μ 24
3.2.2 λΉμ μ κ³Όλμν μ΄μ λ¬λ°©μ μ 26
3.2.3 λλ₯ λ° λ³΅μ¬λ₯Ό κ³ λ €ν μ΄μ λ¬λ°©μ μ 27
3.2.4 Eurocode 3μ 무νΌλ³΅ λ° νΌλ³΅κ°μ¬ νλ©΄ μ¨λλ³ν 곡μ 28
3.3 ν΄μκΈ°λ² 30
3.4 κ°μ¬μ κΈ°κ³μ λ° μ΄μ νΉμ± 35
3.4.1 μΌλ° νμκ° 35
3.4.1.1 κΈ°κ³μ νΉμ± 35
3.4.1.2 μ΄μ νΉμ± 43
3.4.2 λ΄νγλ΄μ§κ° 46
3.4.2.1 κΈ°κ³μ νΉμ± 46
3.4.2.2 μ΄μ νΉμ± 48
3.4.3 λΉμ ν μλ ₯-λ³νλ₯ κ΄κ³ μ μ 49
3.5 μμΉν΄μ κΈ°λ² κ²μ¦ 52
3.5.1 μ΄μ λ¬ν΄μ κ²μ¦ 52
3.5.2 보λΆμ¬ μ΄μλ ₯ν΄μ κ²μ¦ 55
3.5.3 κΈ°λ₯λΆμ¬ μ΄μλ ₯ν΄μ κ²μ¦ 57
3.5.4 κ²μ¦κ²°κ³Ό κ³ μ°° 58
μ 4μ₯ λ΄νγλ΄μ§νκ°μ λ΄νμ±λ₯νκ°
4.1 κΈ°λ₯λΆμ¬ 60
4.1.1 μ΄κΈ°κ΅½ν(initial bow imperfection) 60
4.1.2 μ΄κΈ°κ΅½νμ κ³ λ €ν μ’κ΅΄νμ€ μ°μ 61
4.1.3 ν΄μ쑰건 65
4.1.4 ν΄μκ²°κ³Ό 66
4.2 보λΆμ¬ 77
4.2.1 ν΄μ쑰건 77
4.2.2 ν΄μκ²°κ³Ό 79
4.3 λ΄νγλ΄μ§κ°μ¬ λ° μΌλ°νμκ°μ νκ³μ¨λ 90
μ 5μ₯ λ΄νγλ΄μ§νκ°μ κ²½μ μ±νκ°
5.1 λ΄νγλ΄μ§νκ°μ κ²½μ μ±νκ° λ°©λ² 91
5.2 λ΄ννΌλ³΅μ¬ 94
5.2.1 λ΄ν λΏμΉ νΌλ³΅μ¬ κ΄λ ¨ κΈ°μ‘΄μ°κ΅¬ 94
5.2.2 λ΄ν λΏμΉ νΌλ³΅μ¬ μ μ 95
5.2.3 CAFCO 300 μ΄μ νΉμ± μ‘°μ¬ 95
5.3 νΌλ³΅μ¬λ₯Ό ν¬ν¨ν 2μ°¨μ μ΄μ λ¬ν΄μ 98
5.3.1 λμΌ νΌλ³΅λκ» μ μ©μμ λ΄νμ±λ₯μκ° νκ° 98
5.3.2 λμΌ λͺ©ν λ΄νμ±λ₯μκ°μ λν νΌλ³΅λκ» νκ° 101
5.4 μ² κ³¨ λ΄ν νΌλ³΅λΏμΉ 곡μ¬λΉ μ°μ 103
μ 6μ₯ κ²° λ‘
6.1 μ°κ΅¬κ²°λ‘ 107
6.2 ν₯νμ°κ΅¬ 108
μ°Έκ³ λ¬Έν 111Maste
The clinical effectiveness of simulation based airway management education using the Korean emergency airway registry
Introduction. Simulation training with an integrated simulator is appropriate for achieving educational goals in airway management. Thus, we designed this study to evaluate the effectiveness of a simulation based emergency airway management pro-gram (SBEAMP) in actual practice. Method. This is a retrospective sub-group analysis of the Korean Emergency Air-way Management Registry from 2006 to 2010. We categorized all hospitals into two groups. Six hospitals that actively attended SBEAMP were defined as the βparticipant groupβ, and the others as the βnon-partici-pant groupβ. The types of medicines admin-istered, the use of pre-oxygenation, and the rate of first pass success were compared. Result. The ratio of patients with no medi-cine received during intubation showed a decrease in both groups but was more rapid in the participant group (p<0.001). The ratio of intubation with sedatives alone was high in the non-participant group (P<0.001). The ratio of intubation with paralytics alone was high in the non-participant group (p<0.001). In the partici-pant group, a combination of both agents was used more frequently (P<0.001). Cases of intubation with both agents and preoxy-genation were more prevalent in the par-ticipant group (P<0.001).
Conclusion. We concluded in this study that SBEAMP had a positive influence on actual clinical outcomes in emergency air-way management.ope
Guidewire-Assisted Nasogastric Tube Insertion in Intubated Patients in an Emergency Center
Background: The purpose of this study is to identify the usefulness of guidewire-assisted nasogastric tube insertion in intubated patients with cervical spine immobilization or unstable vital signs in an emergency center. Methods: Thirty-four intubated patients in an emergency center were enrolled in the study. Patients were randomly allocated to the control group or the guidewire group. All patient necks were kept in neutral position during the procedure. In the control group, the nasogastric tube was inserted with the conventional method. A guidewire-supporting nasogastric tube was used in the guidewire group. The success rates of the first attempts and overall were recorded along with complications. Results: The first attempt success rate was 88.2% in the guidewire group compared with 35.2% in the control group (p < 0.001). The overall success rate was 94.2% in the guidewire group and 52.9% in the control group (p = 0.017). Five cases of self-limiting nasal bleeding were reported in the guidewire group, and two cases occurred in the control group. No statistical differences were identified between groups. Conclusions: Guidewire-assisted nasogastric tube insertion is a simple and useful method in intubated patients with cervical spine immobilization or unstable vital signs.ope
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