Study on Progressive Collapse of RC Structures
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force method for progressive collapse resistance of structures
Proc. 10th National Conference on fundamental theory
and engineering application of concrete, Aug. 2008, Dalian, 391-396.
Abstract£ºTie force (TF)
method is one of the major design methods proposed by foreign codes
to resist progressive collapse, but the related researches are still
lack in China. TF method is convenient to implement because it does
not need to calculate the response of the whole structure. However,
as too many assumptions have been set to build up this method, the empirical
factors are needed to be carefully checked to guarantee the safety of
the TF design. This paper summarized the conceptions and specifications
of TF methods in foreign codes. Then foreign TF methods were proved
to be not safety for Chinese concrete frames with nonlinear finite element
dynamic analysis. In order to explain this phenomenon, the drawbacks
in foreign TF methods were pointed out from the discussion of the fundamental
principles of TF methods. And the suggestions from these discussions
will be helpful to setup a feasible TF method in China.
Keywords: concrete frame structures£»progressive
collapse; design codes; tie force method
Design
Method to Resist Progressive Collapse for a Three-Story RC Frame
Journal of PLA University of Science and Technology,
2007, 8(6): 659-664
Abstract£ºCurrently,
the progressive collapse of the structures has become a serious threat
to the public safety. Since the collapse of the Ronan Point Tower in
United Kingdom in 1968, North America and Europe have researched on
this issue for more than 30 years and developed relevant design codes
and design guides, such as GSA 2003, DoD 2005 and EuroCode 1. However,
codes in China have not yet proposed in detail on the resistance of
progressive collapse. Hence, based on the design process proposed in
DoD2005, the capacity to resist progressive collapse of a typical Chinese
3-story reinforced concrete (RC) frame is analyzed. Then the frame is
re-designed with the Tie Force Method and the Alternate Path Method
proposed in DoD 2005 to provide examples for the progressive collapse
prevention design for Chinese frame structures. And some problems when
applying foreign code to Chinese buildings are pointed out.
Key words£ºprogressive collapse; concrete frame; simulation;
tie force method; alternate path method
Progressive
collapse of structures: introduction and comparison of standards
Proc. 6th National Conference on Safety Protection for
Engineering Structures. Luoyang, 2007. 195-200.
Abstract:
Currently, the progressive collapse of the structures has become a serious
threat to the public safety. Since the collapse of the Ronan Point Tower
in United Kingdom in 1968, north America and Europe have conducted more
than 30 years of research to this issue and developed relevant design
codes and design guides. However, codes in China have not yet provided
details on the resistance of progressive collapse. In this paper, the
corresponding design specifications for the progressive collapse prevention
in the main foreign design codes (e.g.,ACI 318-02£¬GSA 2003£¬DoD
2005¡¢EuroCode1¡¢BS8100) are summarized and compared.
Then, the major design methods to prevent progressive collapse are proposed
and suggestions are given for the Chinese codes.
Key words: progressive collapse codes design method
Simulation
for the collapse of RC frame tall buildings under earthquake disaster,
Proc. International Symposium on Computational Mechanics
(ISCM2007), Yao ZH & Yuan MW (eds.), Beijing: Tsinghua University
Press & Springer, July 30-August 1, 2007, Beijing, China, 266 &
CDROM.
Abstract: China is a country that suffers a lot from the earthquake disaster. The major reason for the human death and property losses in earthquake is the collapse of the tall buildings. Hence, correct simulation for the failure modes and accurate prediction for the collapse of the tall buildings under earthquake disaster is very useful for studying the safety of buildings and evaluating losses during earthquakes. However, a lot of simplifications must be carried out in the existing simulations to overcome the numerical problems because the grave nonlinearity exists when collapse happens. This may lead to the results away from a real phenomenon. In this study, a fiber model for reinforced concrete (RC) structures (referred as THUFIBER) is developed, which is based on the general-purpose finite element package of MSC.MARC that carries significant capacity of solving nonlinear problems. In this model, the concrete and the reinforcement inside the structural elements are modeled respectively with different fibers so that the cyclic behavior of material can be properly simulated. Pushover and dynamic time-history analysis for a RC frame tall building are carried out to illustrate the capacity of the proposed model. And dynamic time-history analysis is emphasized in this paper to discuss the collapse modes of the structure. The results show that THUFIBER can simulate the collapse and failure process of the structure under the dynamic loads such as complicated seismic loads, including the softening and fracture behaviors of structural elements, and further the program shows good convergence in the non-linear cases. So THUFIBER has a strong and promising ability for nonlinear analysis including collapse numerical simulation.
Keywords: fiber model, concrete, seismic, collapse, finite element, frame
Simulation
for the Collapse of Reinforced Concrete Frame under Blast Load with
Fiber Model
Blasting, 24(2), 2007, 1-6.
Abstract: More and more attentions have been given to the simulation of collapse of structures under blast load. In this work, the collapse of a reinforced concrete (RC) frame under blast load is simulated with the fiber model based program THUFIBER, which is developed with MSC.MARC commercial finite element (FE) software. The flexural and shear failures of RC frame designed according to Chinese building codes have been considered in THUFIBER. The numerical results show that THUFIBER can correctly simulate the collapse of RC frame structure. And several important parameters are discussed with the FE model.
Keywords: blast, collapse, fiber model, reinforced concrete, finite element
Study
on the Frame and Soil Model in Collapse Analysis
Computer Aided Engineering, 2006, 15(Sup.), 417-420.
Abstract: Based on the common finite element software of MSC.Marc, with the convenient secondary development capacity, special models for reinforced concrete (RC) frame and soil are developed, in which the RC beams and columns are simulated with the fiber model based program THUFIBER, while the soil is simulated with a modified Drucker-Prager model. The computational results show that with the outstanding nonlinear capacity and secondary development function, the superstructure and soil can be properly simulated.
Key words: MSC.Marc, reinforced concrete frame, fiber model, soil model