Qing Lin Tao

Analysis of Storey Damage Effect Factors of SRC Frame-RC Core Tube Hybrid Structure under Cyclic Loading

Based on the general finite-element software ABAQUS, the FE model of 30-story SRC frame-RC core tube hybrid structure is built up. The maximum story drift angle of the structure under cyclic loading can effectively characterize the changes in storey damage. With the new achievements on damage effect factors, the relation between storey damage and component damage of various types and influence of the main design parameters on the storey damage law are analyzed. It is found that storey damage degree is more serious with the increase of stiffness character value and shear wall depth-thickness ratio, but the effects of both of them are gradually weakened and the change range of it is really small. Research will provide theoretical support on the building of hybrid structure damage model under earthquake excitation.

Fuzzy AHP GA-Based Optimization Design of SRC Beam

Genetic algorithms (GA) are very effective at finding optimal solutions to a variety of problems. This innovative technique performs especially well when solving complicated real-world problems. Therefore, this paper aims to use the fuzzy analytical hierarchy process (AHP) GA approach to optimize SRC beam. In the process of optimization, the matlab toolbox with GA is used. To increase the performance of the genetic-based approach for optimization problems, the design constraints related to member stress, bending moment etc are described by using fuzzy set theory. Finally, a example for beam optimization is presented. The example shows that the approach is flexible enough to deal with optimization of SRC beam.

Study on the Floor Damage Model of Hybrid Structure under Seismic Excitation

Structural destroy is a development process that damage is accumulated gradually under earthquake, and the partial destruction leads to the overall damage, even structural collapse finally. Based on the damage model of beam, column and shear wall, the damage is studied from the component level, the most important design parameters which include bending strength ratios of beam to column, xial compression ratio and stiffness characteristic value are researched. Then the finite element numerical analysis software ABAQUS is used to analyze the influence of various component damage on seismic performance of floor. Finally, this paper adopts Weighting Coefficient Method to establish a reasonable model for the floor damage evaluation .It proves that the model can reflect the relationship between component damage and floor damage.

A Multiaxial Damage Statistic Constitutive Model for Concrete

In order to apply the uniaxial damage evolution equation that established with the variable of strain to the multiaxial damage quantitative analysis, this paper bases on the Hsieh-Tang-Chen four-parameter failure criterion and adopts the way of making the triaxial equivalent strain combining with the uniaxial damage evolution equation to analyze and deduce the uniaxial damage evolution equation of SRHSHPC, and which is expanded to multiaxial condition as well. A function considered triaxial stress state and a related correction value are suggested, then, improving the damage evolution equation from triaxial to multiaxial form, finally proposing the multiaxial damage statistic constitutive equation for concrete, taking numerical simulation with the complete decoupling method and the result shows that the model is effective.

Hierarchical Genetic Algorithm for Soil-Nail Bracing

Hierarchical genetic algorithm (HGA) are widely used in most engineering, this paper aims to propose an optimization model of soil-nail bracing by application the hierarchical genetic algorithm. In the process of optimization, soil nailing cost is setted as the objective function and the internal overall stability of the soil nailing is setted as primary controlling factor. Finally, an example is cited to verify the optimization model. By comparison the traditional genetic algorithm with the HGA, it is concluded that HGA optimization model of soil-nail bracing gets better economic effect.

Shear Calculation of the Interface in SRHSHPC Beam

Experiment study and theoretical analysis show that when the interfacial bond property cannot guarantee the cooperative work of structural steel with concrete, SRHSHPC (steel reinforced high-strength and high-performance concrete) beam will generate in splitting failure of bending, resulting in SRHSHPC beam flexural capacity does not work. According to the experiments, and adopting existed theory and domestic as well as foreign codes for composite beam, the failure modes, and shear calculation of SRHSHPC beam are analyzed in this paper.

Shear Capacity Analysis of SRHSC Frame Joints

Based on the tests of 5 steel reinforced high strength concrete (SRHSC) frame interior joint specimens, this paper discusses the mechanism of load transference in the joints. Shear effect of each part of the joints including concrete, steel web, band, flange frame and stirrup is analyzed. And then, the shear capacity equation of SRHSC frame joints is presented. Comparing the calculation results with the test results, it is indicated that the shear capacity equation proposed can correctly evaluate the ultimate shear strength for SRHSC joints.

Study on the Damage Law of SRC Frame-RC Core Wall Hybrid Structure Storey Affected by Component Damage

Based on the general finite element software ABAQUS, the FE model of 30-story SRC frame-RC core wall hybrid structure is established and the simulation analysis is conducted to the evolution of storey damage under cyclic loading, then the law of storey damage evolution affected by component damage is revealed. The analysis results show that the storey damage evolution is affected more by the damage of SRC column and RC shear wall than by the SRC beams, when the single component has similar damage; and also is affected greatly by the damage of RC shear wall, when the two different types of components have similar damage. Based on the results of numerical simulation, the mathematical relations between the component damage and the storey damage are established, which would provide theoretical support to the hybrid structure damage model under earthquake excitation.

Seismic Behavior of Reinforced Concrete Frame Columns with Different Volumetric Percentage of Stirrups

Based on the experiments of a reinforced concrete frame column, 5 new members with different volumetric percentage of stirrups which are applied with constant axial load and horizontal low-frequency cyclic load are analyzed with ABAQUS. This paper aims to study the relationship between volume-stirrup ratio and seismic behavior of reinforced concrete column. By analyzing skeleton curve and hysteretic curve of members, the results show that, if stirrups are reasonably arranged and the volume-stirrup ratio is larger enough, the good ductility, carrying capacity, energy dissipation capacity, and seismic behavior still be obtained with high axial compression ratio.

Multi-Objective Optimization Design of Hybrid Structure

The primary goal of failure modes-based optimization design which is to study the performance of structure without shocking absorption device is to transform the non-ideal failure modes of structure into the ideal failure modes, and then a small probability of the structure damage can be obtained. Although the study of this field is significant, no paper has so far attempted to study. Taking the cost of the structure into consideration, this paper aims at the failure modes-based optimization design. Therefore, an optimal approach based on failure modes with the ability to limit the cost is proposed. The procedure to obtain the failure modes-based optimization includes two phases, the concrete optimization and the shaped steel optimization. At last a reinforced concrete frame-shear wall structure is cited to verify the method developed. It is concluded that the method can supply an effective way to reduce both the damage and the cost of steel reinforced concrete framework-core tube structure.