Key Laboratory of Structural Engineering and Earthquake Resistance

Fengcheng, China

Key Laboratory of Structural Engineering and Earthquake Resistance

Fengcheng, China

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Xing G.,Chang'an University | He Z.,Chang'an University | Niu D.,Key Laboratory of Structural Engineering and Earthquake Resistance | Wu T.,Chang'an University | And 2 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2014

According to the study on failure characteristics of reinforced concrete beam-column-slab exterior joints, a modified softened strut-and-tie model, which can be used to calculate the shear strength of frame joint with orthogonal beams, is put forward by taking the influence of the reinforcement in cast-in-place floor on the depth of the diagonal strut and making a modification on the effective width of the frame joints. Furthermore, the shear behavior of existing tested 11 reinforced concrete beam-column-slab exterior joints at home and abroad was analyzed by using the suggested model. The results indicate that the modified softened strut and tie model can more precisely predict the joint shear strength than that of softened strut-and-tie model for the "equal strong" joint specimens, but the joint shear strength predicted by the current code suggested method is larger than the test value, which may result in the joint core failure; For the "strong" joint specimens, the results also indicate that the failure mode of reinforced concrete beam-column-slab exterior joints predicted by modified softened strut and tie model is quite nearly with that of the test, and the joint shear strength predicted by the modified softened strut and tie model is more reasonable than that of the code method, which can make sure of the safety of reinforced concrete frame structure.


Wu T.,Chang'an University | Wu T.,Key Laboratory of Structural Engineering and Earthquake Resistance | Liu X.,Chang'an University | Xing G.-H.,Chang'an University
Gongcheng Lixue/Engineering Mechanics | Year: 2013

The concrete code for the column shear-capacity design of a structure is gained through simi-empirical and semi theoretical. However, due to the limited test data and its own characteristics of a concrete structure, standardize formula cannot cover all the columns of shear calculations. Thusly, the thought of dynamic information updates based on Bayesian approach was introduced. A Bayesian prior model is proposed based on the epistemic information from the empirical formula. Two types of the information, the epistemic information and the experimental information, are synthesized by the Bayesian approach and inferred to update the prior model. And the probabilistic models for shear capacities of reinforced concrete column are constructed and unknown model parameters are estimated. Then modify the models and construct the new ones. Though the values of the prior model, posterior model and experiments are calculated and compared, the advantages of updating Bayesian dynamic information can be seen. The approach inherits the completeness of the prior model and the accuracy of number of experimental data information. Thus it can more accurately predict and verify the shear strength of concrete columns.


Wu T.,Chang'an University | Wu T.,Key Laboratory of Structural Engineering and Earthquake Resistance | Liu X.,Chang'an University | Li D.-Y.,Chang'an University | And 2 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2015

The current codes for calculating the shear capacity of internal reinforced concrete frame joints are simi-empirical and semi-theoretical. Due to limited test data and the discretized characteristics of concrete structures, the design equations recommended in the code is lack of a clear theoretical framework. Thusly, the concept of dynamic information updates based on the Bayesian approach was introduced. 101 groups of experimental test results of internal frame joints were collected from experience at home and abroad. A multivariate linear probabilistic shear strength model for reinforced concrete internal joints was established using the Bayesian estimation method. Subsequently, the model was simplified using the stepwise procedure to remove parameter insignificant explanatory terms. The developed probabilistic model is compared with experimental results and design equations proposed by ACI 352R-02. It indicated that the proposed model inherits the completeness of prior models and the accuracy of experimental data information, and therefore is recommended for the shear strength calculation of the interior joints of reinforced concrete frames. ©, 2015, Tsinghua University. All right reserved.

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