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Jiao A.,Chongqing University | Jiao A.,China Construction Seventh Engineering Division Co. | Zhang P.,China Construction Seventh Engineering Division Co. | Li Y.,China Construction Seventh Engineering Division Co. | Zhi X.,Harbin Institute of Technology
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

In order to study the seismic behavior of pre-cast reinforced concrete(RC) shear walls with annular closed reinforcements, quasi-static tests of 15 shear wall specimens were carried out. Influence of styles of connection, arrangements of reinforcement and axial compression ratios on bearing capacity, hysteretic characteristics and failure mechanism were studied. According to the diameter of vertical reinforcements and strength grade of concrete, the specimens were divided into three groups. Each group included two cast-in-situ RC wall specimens and three pre-cast wall specimens. The test results indicate that the failure mode of pre-cast wall specimens is the same as that of cast-in-situ wall specimens, i.e., compression-bending mode. The ultimate drift ratios of the pre-cast wall specimens with annular closed reinforcements are 1/82~1/50, and the ultimate lateral bearing capacity, energy-dissipation and ductility performance of them are similar to that of cast-in-situ RC wall specimens. Research shows that pre-cast reinforced concrete shear walls with annular closed reinforcements have good seismic performance and they can be used for prefabricated shear wall structures. ©, 2015, Science Press. All right reserved. Source

Li Z.,Chongqing University | Xu S.,Chongqing University | Liu H.,Chongqing University | Jiao A.,Chongqing University | Jiao A.,China Construction Seventh Engineering Division Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2016

By combining the advantages of precast buildings with the advantages of concrete filled steel tubular (CFST) column-reinforced concrete (RC) beam braced frames, a new type of precast CFST column-RC beam braced frame structure with welded and bolted steel connections is proposed. In a series of shake table tests with a variety of earthquake intensities, a 1:3 scale 6-story model was excited for investigating the structural dynamic response, failure pattern, global seismic performance, structural failure path and reliability of connection joints of this type of structure. The study shows that: (1) This type of structure exhibits "strong CFST column-weak RC beam" and "strong connection-weak member" failure mechanisms; (2) Damages generally occur at the interface between the reinforced concrete beam segment and the I-section steel girder segment with a considerable distance to the core area of the beam-column joint, so that the integrity of the core area of beam-column joint can be ensured; (3) Due to the failure of braces under strong earthquake action, a few floors can be transformed into weak stories, leading to the amplification of the structural dynamic response. © 2016, Editorial Office of China Civil Engineering Journal. All right reserved. Source

Ding W.-X.,Luoyang Institute of Science and Technology | Chen J.-P.,Institute of Longmen Grottoes | Xu T.,China Construction Seventh Engineering Division Co. | Chen H.-J.,Luoyang Institute of Science and Technology | Wang H.-Y.,Luoyang Institute of Science and Technology
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

To explore the chemical erosion phenomena, the chemical compositions of the spring water, seeping water and rainwater in Longmen Grottoes area are analyzed; and chemical solutions with different compositions are artificially made, which are in turn used to study the mechanical properties and the chemical solubility of Longmen Grottoes limestone under influences of different chemical solutions. The strength damage characteristics of the limestone are obtained based on the mechanical experiments with respect to different solutions and different erosion durations. A time-dependent corrosion equation of uniaxial compressive strength for limestone is developed under different chemical solutions. Based on the chemical kinetic tests on limestone under the effects of the different chemical solutions and for different erosion durations, the solubility of limestone eroded by different chemical solutions is addressed. The chemical dynamic erosion equations of limestone are developed. The analysis indicates that the strength of limestone decreases due to the dissolution of chemical solutions under chemical erosion. The salt effect and the common ion effect significantly influence the dissolution rate and strength of limestone. The salt effect can raise the dissolution rate, while the common ion effect can reduce the dissolution rate. When the composition and concentration of the solution are the same, the stronger the acidity, the larger the dissolution rate is. The dissolution rate of limestone increases with the increase of salt concentration when the composition and the pH value of the solution are the same. ©, 2015, Academia Sinica. All right reserved. Source

Jiao A.,Chongqing University | Jiao A.,China Construction Seventh Engineering Division Co. | Li Z.,Chongqing University | Liu H.,Chongqing University | Mao J.,Chongqing University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

A new analytical model as well as computational method to calculate rotational deformation of K-type joints consideration semi-rigid connections in UHV transmission tower is presented based on full-scale tests of K-type joint. This method can make a good performance in calculating and analyzing the different component related to rotational deformation, including the shear deformation of the main angle-steel, the shear deformation of bolt and the deformation of bolt. It is considered that the connection rotation is mainly induced by the deformation of the main angle in shear, bolts in shear, hole wall in bearing and it provides the moment-shear rotation curve and moment-rotation curve. The three parameter power function model of Kishi-Chen is suitable for this kind of joint moment rotation calculation, resulting in shape coefficient of approximately between 1.5~2.2. The proposed model quantifies effects on initial rotational stiffness of limb width and thickness, bolt diameter and joint plate thickness, but cannot consider the two limbs boundary interaction of angel-steel. Source

Jiao A.-L.,Chongqing University | Jiao A.-L.,China Construction Seventh Engineering Division Co. | Li Z.-L.,Chongqing University | Liu H.-J.,Chongqing University
Applied Mechanics and Materials | Year: 2014

Both experimental research and theoretical analysis of ultimate strength for steel tubular tower joint are developed. The experimental data comprise four different specifications of steel tube, that is, without ribbed plate, with 1/4 annular ribbed plate, with 1/2 annular ribbed plate and with annular ribbed plate. This paper considers that the ultimate strength of steel tubular joint depend on the following four parameters, that is, the ratio of length of joint plate to outer diameter of steel tube B/D, outer diameter D, axial force and ratio of length of annular plate to outer diameter of steel tube R/D as well as the ratio of thickness of annular plate to thickness of steel tube. Furthermore, a recommended formula of the ultimate strength of steel tubular joint is derived by the potential energy principle and the principle of virtual work in elasticity and plasticity based on the failure modes of experimental specimens. It is demonstrated that the applicability of the recommended formula is better. © (2014) Trans Tech Publications, Switzerland. Source

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