scholarly journals Strain Rate Effect on the Progressive Collapse Analysis of RC Frame Structure under Earthquake

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Wenming Wang
Keyword(s):  
Strain Rate ◽  
Progressive Collapse ◽  
Strain Rate Effect ◽  
Frame Structure ◽  
Rc Frame ◽  
Strain Rate Effects ◽  
Rc Frame Structure ◽  
Rate Effects ◽  
Collapse Analysis ◽  
Progressive Collapse Analysis

The strain rate effect can influence the seismic responses of reinforced concrete (RC) structures because the constitutive relationship of concrete and rebar is rate-dependent. This paper carries out progressive collapse analysis to research the influence of strain rate effects on collapse-resistant capacity, collapse mode, and collapse path of the RC frame structure. A progressive collapse simulation program for the reinforced concrete (RC) structure with a static and dynamic constitutive relationship is coded individually using the user subroutine VUMAT and then implemented in the advanced finite element program ABAQUS. The good agreement between experimental and simulation results proves that the coded subroutine is reliable. With the coded subroutine, by conducting progressive collapse analyses of a four-story RC frame structure under earthquake, the effect of strain rate on the response is investigated. The numerical results demonstrate that the collapse-resistant capacity of the structure is underestimated when the strain rate effect is neglected. It is shown that strain rate effects influence the collapse mode and collapse path of the structure. Therefore, strain rate effects should be considered in the progressive collapse analysis of the RC frame structure.

Key Components for RC Frame Structure during Progressive Collapse

2013 ◽  
Vol 470 ◽  
pp. 1097-1100
Author(s):  
Bing Bing Tu ◽  
Dong Zhao
Keyword(s):  
Sensitivity Analysis ◽  
Progressive Collapse ◽  
Frame Structure ◽  
Rc Frame ◽  
Structure Damage ◽  
Rc Frame Structure ◽  
Alternate Path Method

To illustrate the changes of important components during progressive collapse, this paper sums up the judgment method for important components. Based on the alternate path method and the concept of sensitivity analysis, we determine the key component of a RC frame structure. Then the changes of important components during progressive collapse are given. The results show that the location of key components changing with the structure damage in the process of progressive collapse.

A computationally efficient numerical model for progressive collapse analysis of reinforced concrete structures

2019 ◽  
Vol 10 (3) ◽  
pp. 330-358 ◽  
Author(s):  
Zhong-Xian Li ◽  
Bo Zhong ◽  
Yanchao Shi ◽  
Yang Ding ◽  
Yifei Hao
Keyword(s):  
Reinforced Concrete ◽  
Numerical Model ◽  
Progressive Collapse ◽  
Concrete Structures ◽  
Frame Structure ◽  
Reinforced Concrete Structures ◽  
Proposed Model ◽  
Structural Resistance ◽  
Collapse Analysis ◽  
Progressive Collapse Analysis

Although marked advancements have been achieved to improve the computer power, progressive collapse analysis of large-scale reinforced concrete structures is still time-consuming or even impractical. In this study, a numerical model is proposed for efficient progressive collapse analysis of reinforced concrete structures. Recent advancements that can accurately and efficiently model the mechanical behavior of structural components are incorporated in the numerical model of reinforced concrete structure. The beams/columns, joint regions, and slabs are modeled by enhanced fiber beam element, macrojoint model, and layered shell element, respectively. In this way, the shear failure of beams/columns, failure of joints, and resistance contribution from floor slab can be taken into account for progressive collapse analysis of reinforced concrete structures. A six-story reinforced concrete frame structure is modeled using the approach proposed in this study. The progressive collapse of the structure is analyzed under column removal and direct blast loading scenarios. For comparison purpose, other popularly used finite element models are also adopted to carry out numerical simulations. The proposed model is proven to yield accurate simulation results with the least cost of time among all models. Based on the proposed model, parametric simulations are performed to investigate effective measures to improve the structural resistance to progressive collapse. It is found that increasing longitudinal reinforcement ratio in beams and columns can increase the catenary action capacity, but hardly increases the compressive arch action capacity. Moreover, the steel mesh reinforcement at top layer of slabs plays a significant role in resisting progressive collapse of reinforced concrete structures, which should be considered in design to resist progressive collapse.

Evaluation of Dynamic Collapse Behavior of Steel Moment Frames Damaged by Blast

2011 ◽  
Vol 82 ◽  
pp. 404-409
Author(s):  
Kyung Koo Lee ◽  
Lan Chung ◽  
Sang Hyun Lee ◽  
Tae Won Park ◽  
Jieun Rho
Keyword(s):  
Progressive Collapse ◽  
Mitigation Strategies ◽  
Analysis Method ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Strain Rate Effects ◽  
Collapse Analysis ◽  
Alternate Path Method ◽  
Collapse Behavior ◽  
Progressive Collapse Analysis

Blast effects on structures and blast mitigation strategies have been vigorously studied in the world. The alternate path method, or common progressive collapse analysis method, of structures assumes the threat-independent removal of vertical load-carrying elements. However, in reality, a blast-induced column-missing event will produce the damage on adjacent structural elements and the rapid dynamic response of the structures. In this study, the strain rate effects on the dynamic collapse behavior of steel moment frames are investigated by performing the blast-induced sequential progressive collapse analysis. Then, the improvement of the progressive collapse analysis method is discussed based on the numerical results.

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