Advances in Protective Structures Research by Hong Hao, Zhong-Xian Li

By Hong Hao, Zhong-Xian Li

The foreign organization of protecting constructions (IAPS) used to be introduced on 1 October 2010 in Manchester, united kingdom through the first foreign convention of protecting constructions. the first objective of IAPS is to deliver researchers and engineers operating within the region of protecting buildings jointly, and to advertise examine and improvement paintings for larger lifestyles and constitution safety opposed to surprise and effect a lot. additional info are available at http://www.protectivestructures.org/contact.html.

Advances in protecting constructions Research is the 1st e-book in a chain of deliberate guides by way of IAPS. It includes thirteen chapters ready through energetic and admired researchers all over the world within the zone of protecting constructions. It covers the dynamic fabric version and fabric houses, structural reaction research, structural reliability research, impression rather a lot and floor surprise. The contents of the booklet mirror good the present learn achievements and perform in structural safety opposed to blast and impression a lot. They signify the complicated foreign study prestige in theoretical derivations, numerical simulations, and laboratory and box exams for constitution protections.

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1998. 2. , Wu, Y. 2011. “Numerical Analysis of Standard Laboratory Concrete Strength Tests Using Explicit Lagrangian Analytic Models,” Proceedings of the 8th International Conference on Structural Dynamics. , “Theoretical Stress-Strain Model for Confined Concrete” by. Journal of Structural Engineering, Vol. 114, No. 8, August, 1998. D. 2007. “Users manual for LS-DYNA concrete material model 159,” Report No. FHWAHRT-05-062, Federal Highway Administration. , and Bligh, R. 2006. “Evaluation of concrete material model 159,” FHWAHRT-05-063.

The model implements a radial rate enhancement on the concrete failure surface. The enhanced strength Δσ c me is represented by Δσ me Δσ mc ( p / rf ) f (12) where rf is the dynamic increase factor (DIF). Pressure cut off and softening Another point worth noting is the stress softening. The model implements a volumetric damage in conjunction with the pressure softening. This is expressed by considering a volumetric plastic strain Δλ, which is added into the damage function λ, Δλ f 3 d d (ε v − ε v , yield ) (13) where b3 is a user-defined scalar multiplier, kd is an internal scalar multiplier, ε v is the volumetric strain, ε v, yield is the volumetric strain at yield, fd is used to restrict the effect of the volumetric damage.

TXC and TXE Tests. MAT072 captures the brittle-ductile transition under high confinement properly (Fig. 13a), whereas MAT159 shows some unexpected discontinuities and MAT084 exhibits some marked instabilities. The TXE response under high confinement is not properly captured by MAT084 or MAT159. 20 For the MAT072 model, shear dilation is captured as shown in Figure 16, which is similar in nature to that measured in tests. Peak compaction is reached during the strain-hardening phase, and the concrete starts to expand afterwards, the amount being related to the model parameters.

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