(Pdf) comprehensive safety assessment for cfst tied arch bridge subjected to explosion gas what i smoke

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In order to obtain reasonable anti-blast design and risk assessment of urban municipal bridges in a densely populated city, dynamic response and damage process analysis method for urban bridges subjected to blast load is proposed in this paper. By analyzing the explosion risk sources of urban bridges, the explosion source types and blast load conditions likely to be encountered by urban bridges are determined. Then, the finite element models of bridge, dynamite and air are established in ANSYS/LS-DYNA software. The dynamite model and the air model are defined by the JWL (Jones-Wilkins-Lee) state equation and us electricity hertz linear polynomial state equation, respectively. The ALE (arbitrary Lagrange-Euler) algorithm is used to simulate the propagation of shock wave actuated by explosion. The effects of position and quantity of dynamite on the response of displacement and the Von-Mises stress distribution in the key parts of the bridge are investigated, and then the damage process and failure modes of the bridge are analyzed. Based on the Tuler-Butcher gas 87 89 93 cumulative damage rule, the damage accumulation curves under different explosion distances and TNT equivalence blast loadings of specified elements are obtained. In the end, taking a large-span steel truss arch bridge as an illustrative example, the calculation process of the proposed method in this paper is described. The results of this paper can be used as the foundation for anti-blast design and risk assessment of bridge.

This study u gas cedar hill mo introduces a method to obtain accurate results regarding bridge seismic cost and reduce structural seismic losses. A three-span reinforced concrete (RC) continuous bridges model consistent with the reality was established, and seismic vulnerability of the RC bridge was calculated via incremental dynamic analysis combined with local earthquake disaster data. Direct losses from … [Show full abstract] earthquakes are calculated based on local earthquake damage condition, specific maintenance reinforcement methods, and analysis of seismic vulnerability. The indirect economic losses caused by inspection and maintenance are calculated based on local traffic volume. To reduce the effects of bridge aging and deterioration, this paper examines periodic inspection of bridges after earthquakes. By calculating the life cycle cost of structure under different inspection frequencies, the optimal time interval was determined. The results presented for this study can serve as references for the calculation of structural seismic loss and thereby provide the basis for strategies of reducing seismic loss. View full-text

Many of the arch bridges built on the railway network are several decades old and were origin electricity login designed according to the loading prevailed in the 9gag instagram standards of practice. Most of these bridges are in good state even today and can be upgraded to meet the present demand and for continued usage. In the present paper, an upgradation strategy is formulated for an existing old masonry arch bridge to accommodate … [Show full abstract] the demand for conversion of meter gauge to the broad gage track, and for improvement in structural performance, as well. A three-dimensional numerical finite element modeling and analyses were performed to evaluate the response parameters and to assess the efficacy of upgradation strategy for accommodating the gauge conversion on an existing masonry arch bridge system. Experimental investigations have been carried out on a typical masonry arch bridge to validate the numerical model. The upgradation of the modified arch-slab bridge system is carried out by introducing reinforced concrete relieving slab over the soil fill. To avoid any tension between the fill and the arch masonry (both barrel and spandrel), special contact elements with friction co-efficient is incorporated in the finite element model no electricity jokes. From the numerical simulation studies on the modified arch-slab system for the masonry arch bridge, it is found that the proposed upgradation scheme is efficient to meet the need for broad gauge conversion. Read more