scholarly journals Dynamic Response of Steel Box Girder under Internal Blast Loading

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Shujian Yao ◽  
Nan Zhao ◽  
Zhigang Jiang ◽  
Duo Zhang ◽  
Fangyun Lu
Keyword(s):  
Shock Wave ◽  
Dynamic Response ◽  
Failure Modes ◽  
Numerical Study ◽  
Blast Loading ◽  
Deformation Degree ◽  
Box Girder ◽  
Steel Box Girder ◽  
Internal Shock ◽  
Internal Blast Loading

This paper aims at investigating the dynamic response of the steel box girder under internal blast loads through experiments and numerical study. Two blast experiments of steel box models under internal explosion were conducted, and then, the numerical methods are introduced and validated. The dynamic response process and propagation of the internal shock wave of a steel box girder under internal blast loading were investigated. The results show that the propagation of the internal shock wave is very complicated. A multi-impact effect is observed since the shock waves are restricted by the box. In addition, the failure modes and the influence of blast position as well as explosive mass were discussed. The holistic failure mode is observed as local failure, and there are two failure modes for the steel box girder's components, large plastic deformation and rupture. The damage features are closely related to the explosive position, and the enhanced shock wave in the corner of the girder will cause severe damage. With the increasing TNT mass, the crack diameter and the deformation degree are all increased. The longitudinal stiffeners restrict the damage to develop in the transverse direction while increase the crack diameter along the stiffener direction.

Experiment and numerical study on dynamic response of liquid cabin under internal blast loading

2019 ◽  
Vol 145 ◽  
pp. 106405 ◽  
Author(s):  
Ying Li ◽  
Lei Zhang ◽  
Dengbao Xiao ◽  
Tian Zhao ◽  
Zhipeng Du ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Numerical Study ◽  
Blast Loading ◽  
Internal Blast Loading

scholarly journals Design procedures for footbridges subjected to walking loads: comparison and remarks

2017 ◽  
Vol 12 (2) ◽  
pp. 94-105 ◽  
Author(s):  
Alberto Maria Avossa ◽  
Cristoforo Demartino ◽  
Francesco Ricciardelli
Keyword(s):  
Dynamic Response ◽  
Box Girder ◽  
Design Procedures ◽  
Comfort Levels ◽  
Steel Box Girder ◽  
Standards And Guidelines ◽  
Wide Scatter ◽  
Critical Revision ◽  
Code Provisions

This paper aims at pointing out some misconceptions concerning the evaluation of the walking-induced dynamic response of footbridges, and their impact on design procedures. First, a review of the existing Code provisions is briefly presented. In particular single-walker models and multiple-walker models are addressed; in doing so, models originally presented in different forms are made homogeneous for the purpose of comparison; their limits of applicability and advantages are pointed out. Then, the response of six steel box girder footbridges with different spans is evaluated following the provisions of existing Standards and Guidelines, and compared with allowable comfort levels. The comparison showed a wide scatter of the results, revealing some inconsistencies of the procedures, and underlining a clear need for their critical revision.

scholarly journals BDVCM about the Steel Box Girder Reliability Prediction Based on Monitoring Extreme Stresses

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yuefei Liu ◽  
Xueping Fan ◽  
Guanghong Yang ◽  
Zhipeng Shang ◽  
Xiaoxiong Zhao
Keyword(s):  
Failure Modes ◽  
Linear Models ◽  
Dynamic Monitoring ◽  
Nonlinear Dependence ◽  
Multiple Control ◽  
Box Girder ◽  
Steel Box Girder ◽  
Proposed Model ◽  
First Order Second Moment ◽  
Vine Copula

To reasonably predict the steel box girder reliability considering the dynamic dependence among the performance functions corresponding to the failure modes of the multiple monitoring points, this paper firstly adopts the dynamic monitoring extreme stresses of the multiple control points to build the Bayesian Dynamic Vine Copula Model (BDVCM) taking into account the dynamic dependence of the multiple monitoring variables through combining the vine copula technique with Bayesian Dynamic Linear Models (BDLM); secondly, with first-order second-moment method and the built BDVCM, the steel box girder reliability, taking into account dynamic dependence among the performance functions corresponding to the failure modes of the multiple monitoring points, is predicted; finally, the monitoring data from the five sections of an existing steel box girder were provided to illustrate the proposed model and approach. The analytical results illustrated that the predicted results, without considering the dynamic nonlinear dependence among the failure modes of the multiple monitoring points, are conservative.

scholarly journals Dynamic response and damage analysis of steel box wall under internal blast loading

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401882260
Author(s):  
Duo Zhang ◽  
Shujian Yao ◽  
Fangyun Lu ◽  
Jiangjie Song ◽  
Yuqing Ding
Keyword(s):  
Numerical Methods ◽  
Dynamic Response ◽  
Plate Thickness ◽  
Blast Loading ◽  
Damage Mechanism ◽  
Dimensionless Number ◽  
Damage Mode ◽  
Two Dimensional ◽  
Box Models ◽  
Internal Blast Loading

Different loading conditions, different structural dimensions, or different structural materials will lead to different damage results. In this study, blast experiment of steel box model under internal explosion was conducted and the numerical methods are validated through comparison of experimental and numerical results. Then, a series of multi-box models were built, and a large number of numerical simulations considering two kinds of steel, different plate thickness ranging from 0.005 to 0.025 m, and different TNT explosive mass ranging from 5 to 2000 kg were carried out using the validated numerical methods. Two damage modes, convex damage and concave damage, were observed. The dynamic response and damage mechanism were analyzed, and the results show that the different damage modes of the first wall will lead to different damage results of the second wall. Through dimensional analysis, a two-dimensional dimensionless number for internal blast analysis was suggested. Clear physical meanings are conveyed in the dimensionless number. After that, prediction of the damage modes was studied using the proposed dimensionless number. A damage mode map was plotted based on the two-dimensional dimensionless number, and an empirical equation for rapid prediction of damage mode of steel box wall under internal blast loading is proposed.

scholarly journals Analysis on Dynamic Response of Prestressed Concrete Slab Subjected to Blast Loading

2019 ◽  
Vol 136 ◽  
pp. 03015
Author(s):  
Chongxi Bai
Keyword(s):  
Dynamic Response ◽  
Prestressed Concrete ◽  
Failure Modes ◽  
Concrete Slab ◽  
Blast Loading ◽  
Peak Displacement ◽  
Displacement Response ◽  
Blast Resistant Design ◽  
Index Weight

The dynamic response of prestressed concrete slab under blast loading was analyzed based on LS-DYNA. The laws of influence of degree of prestress, combined reinforcement index, weight of explosives, thickness of slab on the dynamic response of prestressed concrete slab under blast loading were discussed, and the failure modes were given. The analysis results showed that the peak displacement at mid-span increased with increasing of degree of prestress and weight of explosives, and reduced with increasing of combined reinforcement index and thickness of slab. All the parameters, the influence of weight of explosives on displacement response of slab was significantly. Rationalization proposals were provided for blast resistant design of prestressed concrete slab.

Dynamic Behavior of Carbon Fiber Explosion Containment Vessels

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Qi Dong ◽  
Bayi Hu
Keyword(s):  
Carbon Fiber ◽  
Dynamic Response ◽  
Glass Fiber ◽  
Dynamic Behavior ◽  
Experimental Observation ◽  
Scale Effect ◽  
Failure Modes ◽  
Cylindrical Shells ◽  
Load Bearing ◽  
Internal Blast Loading

The dynamic behavior of carbon fiber containment vessels subjected to internal blast loading is studied. The experimental observation of dynamic response of carbon fiber cylindrical shells is presented, in which failure modes of structures are especially concerned. The load-bearing capability and scale effect of carbon fiber cylindrical shells are discussed. Carbon fiber cylindrical shells demonstrate better explosion-resistant performance than that of glass fiber cylindrical shells for the specific types of tests and shell configurations investigated. The current study may contribute to the further understanding on the design and application of carbon fiber containment vessels.

The Dynamic Response of a Steel Box-Girder Footbridge under Synchronized Human Stance Excitation

2014 ◽  
Vol 1049-1050 ◽  
pp. 383-386
Author(s):  
Ju Bing Zhang ◽  
Xian Zhang ◽  
Xiao Peng Li
Keyword(s):  
Dynamic Response ◽  
Continuous Beam ◽  
Box Girder ◽  
Vibration Signals ◽  
In Situ Test ◽  
Steel Box Girder ◽  
Code Comparison ◽  
Acceleration Data ◽  
Vibration Serviceability

In order to research into the dynamic response of a steel box-girder continuous beam footbridge excited by a synchronised human stance excitation, a in-situ test and a code comparison were conducted. Sixteen model 891-B accelerometers of vertical, horizontal and lateral directions were instrumented on the bridge and the vibration signals were aqcuired at a sampling frequency of 512 Hz. The acceleration data were transformed into frequency domain to find out the fundamental frequency of the bridge, and the frequency weighted root-mean-square acceleration data were analysed to evaluate the bridge’s vibration serviceability under synchronised human excitation. Further more, the international standard of BSI5400, Bro2004, EN1990, and ISO10137 were applied to the aquired acceleration data to compare their applicability. The results indicate that the dynamic response of the footbridge will not invite uncomfortableness of the pedestrians.

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