China Overseas Property Group Co.

Chongqing, China

China Overseas Property Group Co.

Chongqing, China

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Jia M.,Harbin Institute of Technology | Sun L.,China Overseas Property Group Co. | Guo L.,Harbin Institute of Technology | Lv D.,Harbin Institute of Technology
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

The quasi-static test of one large-scale two-story and one-bay buckling-restrained braced composite frame (BRBCF) including concrete-filled steel tubular columns and steel beams was conducted. The structure can undergo many fully-reversed cycles without degradation of stiffness and bearing capacity, and exhibits great ductility, stiffness and retention capacities. The test frame can sustain story drifts of nearly 2% with large BRB maximum ductility demands. According to strain data analysis of key points of the structure, the formation and development of the plastic deformation of the structural system were explored. Under horizontal loading, the BRBs are the first components that yielded and dissipated energy, and played the role of protecting the main structure. The failure mode of the structure follows the order of BRBs-beams-columns. Due to frame action on BRBs, besides axial force, BRBs in the frame are also influenced by moment, which lead to buckling of non-yielding segments, significant decreases of bearing capacity and stiffness of the BRBs, and BRBs fail at last. According to the damage characteristics of the frame, design suggestions for improving the stiffness of unrestrained non-yielding segment and enlarging the length of restrained non-yielding segment were put forward.


Jia M.,Harbin Institute of Technology | Lu D.,Harbin Institute of Technology | Sun L.,China Overseas Property Group Co. | Zhang S.,Harbin Institute of Technology
Advances in Structural Engineering | Year: 2014

The hysteretic behavior of four buckling-restrained braces (BRBs) with H cross section unrestrained segment was tested under cyclic load. The transformation of the unrestrained segment's section from crisscross shape to H shape can improve the moment-resistance capacity of unrestrained segment significantly and avoid buckling instability of unrestrained segment effectively due to evident stiffness enhancement. BRBs were designed according to Chinese codes, the load-carrying elements of BRBs were fabricated with Chinese Q235 steel. In the process of experiment, BRBs did not buckle, BRBs could undergo fully-reversed axial yielding cycles without loss of stiffness and strength, the ductility and energy absorption capacity of BRBs are large enough to withstand major earthquake. The resilience model can be simplified to a symmetrical bilinear resilience model. The ratio of width to thickness of inner core has a little influence on the mechanical behavior and energy-dissipation capacity of BRBs. A suggestion for design improvement of BRBs was proposed according to the failure modes of BRBs.


Sun L.,Harbin Institute of Technology | Sun L.,China Overseas Property Group Co. | Jia M.-M.,Harbin Institute of Technology | Zhang S.-M.,Harbin Institute of Technology | Lu D.-G.,Harbin Institute of Technology
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2011

Based on the pseudo-static test of two-storey and single-span concrete-filled steel tube (CFST) frame with welded buckling-restrained braces (BRBs), it was researched that the mechanical behavior and seismic performance of CFST frame with BRBs under cyclic low-cycle load in the aspects as: destroy character, loading capacity, hysteretic curves, ductility, energy dissipation, degradation of strength and stiffness; The principle of working together of the structure and the plastic developing theory of the structural components under horizontal load was researched. When BRBs are applied into CFST frame, the lateral stiffness, ultimate strength and energy dissipation ability of the structure will be improved. The structure can undergo many fully-reversed cycles without loss of stiffness and strength, and the ductility of the structure is good. Under horizontal load, the failure mechanism of the structure fellows as: BRBs-beams-columns, BRBs yield firstly, and the failure of the mail frame in the earlier stages has been avoided, welded joints aren't destroyed during the test. So the mechanical behavior and seismic performance of CFST frame with welded BRBs are excellent, which is an efficient seismic structural system.


Jiang H.,Tongji University | Mao J.,China Overseas Property Group Co. | Liu X.,Tongji University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

The constructional details of infilling walls have significant effects on the seismic performance of RC frames. In this study, seven full-scale, one-bay and one-story RC frame specimens, including one bare frame without infilling walls and six infilled frames, where five infilling masonry walls were with flexible connections and one with rigid connection, were tested under low-cycle reversed loads. For the specimens with flexible connections, the variable parameters were the type and amount of constructional column, the existence of tie steel bars in the columns, and the amount of vertical slit set in the infilling wall. Based on the test results, the damage behavior, the force-displacement hysteretic curves and skeleton curves, displacement ductility, stiffness degradation, and energy-dissipation capacity of the specimens were analyzed. The following conclusions can be drawn: the seismic performance of the masonry wall infilled RC frame with flexible connections is between that of the bare frame and the masonry wall infilled RC frame with rigid connections; for the infilled frame with flexible connections, the constructional details of the infilling wall have insignificant effects on the seismic performance of the RC frame.

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