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Wu B.,South China University of Technology | Xu Z.,South China University of Technology | Xu Z.,Shenzhen General Institute of Architectural Design and Research | Ma Z.J.,University of Tennessee at Knoxville | And 3 more authors.
Structural Engineering and Mechanics | Year: 2011

In the past decades, recycling use of demolished concrete was almost limited to the types of recycled coarse aggregate with a size of about 5-40 mm and recycled fine aggregate with a size of about 0-5 mm for concrete structures, and reuse of demolished concrete lumps (DCLs) with a size much larger than that of recycled aggregate, e.g., 50-300 mm, has been limited to roadbed, backfilling materials, or discarded to landfills. Treatment processes of DCLs are much simpler than those of recycled aggregate, leading to less cost and more energy-saving. In the future, the amount of demolished concrete is estimated to be much higher, so reuse of DCLs for concrete structures will become necessary. The objectives of this paper are to document the process of making reinforced concrete beams with DCLs, and to discuss the flexural and shear behaviors of those reinforced DCL beams through an experimental program, which includes three beams filled with DCLs and one conventional beam for investigating the flexural strengths and deformations, and 12 beams filled with DCLs and two conventional beams for investigating the shear strengths and deformations. The authors hope that the proposed concept offers another sustainable solution to the concrete industry.


Wei W.,Hunan University | Yang L.,Shenzhen General Institute of Architectural Design and Research | Lin M.,Hunan University
Applied Mechanics and Materials | Year: 2011

By demonstrating the economical efficiency and environmental friendliness of containers, this paper expatiates the development trend of China's container buildings at the current stage. Researches and analysis have been conducted during the practice of container hostel virtual design by introducing the design essence of Unité d'Habitation de Marseille. This paper also proposes the low-carbon design strategy in container buildings and states the experimental analysis of wind environment in the container hostels. © (2011) Trans Tech Publications, Switzerland.


Wu B.,South China University of Technology | Liu C.,South China University of Technology | Liu Q.,Shenzhen General Institute of Architectural Design and Research
Key Engineering Materials | Year: 2012

Double thin skin hybrid walls filled with demolished concrete lumps (DCLs) are composed of two steel plate "skin" connected by rib plates, with the space between them filled with new concrete and demolished concrete lumps. In order to investigate the seismic behavior of double thin skin hybrid walls filled with DCLs, quasi-static tests of seven specimens were conducted. The parameters considered in the tests are: replacement ratio of DCLs, thickness of steel plate, axial load ratio, rib plate spacing and height-width ratio. Test results show that the seismic performances of double thin skin hybrid walls filled with DCLs are similar to the walls without DCLs, and the double thin skin hybrid walls filled with DCLs also exhibit acceptable ductility and energy dissipation ability. © (2012) Trans Tech Publications.


Wu B.,South China University of Technology | Zhao X.,South China University of Technology | Zhang J.,South China University of Technology | Liu Q.,Shenzhen General Institute of Architectural Design and Research
Key Engineering Materials | Year: 2012

This paper presents a most recent experimental work for evaluating the seismic behaviors of square thin-walled steel tubular columns filled with demolished concrete lumps (DCLs). Fifteen specimens with 300 × 300 mm square section, including 10 columns filled with DCLs and 5 reference columns without DCLs, were tested under combined axial compression and lateral cyclic loading. The parameters considered in the tests are: replacement ratio of DCLs, thickness of steel tube, and axial load ratio. Research findings indicate that the seismic performances of square thin-walled steel tubular columns filled with DCLs are similar to the benchmark columns without DCLs, and the square thin-walled steel tubular columns filled with DCLs also exhibit acceptable ductilities and energy dissipation abilities. © (2012) Trans Tech Publications.


Wu B.,South China University of Technology | Liu W.,South China University of Technology | Liu Q.,Shenzhen General Institute of Architectural Design and Research | Xu Z.,South China University of Technology
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2010

In order to investigate the axial compressive behavior of recycled-concrete-segment/lump filled steel tubular (RCS/LFST) stub columns, based on the tests of 17 specimens, the 7d and 28d axial mechanical properties of RCS/LFST stub columns and concrete filled steel tubular (CFST) stub columns are studied, and a comparison is conducted for stiffness, strength and ductility of the two kinds of stub columns. According to the domestic and foreign design codes for CFST structures, the axial load bearing capacities of the specimens are calculated and compared with the test results. Then a suitable formula is chosen to determine the axial ultimate strength of RCS/LFST stub columns. Test and simulation results show that: (a) although 30% ~ 35% of the concrete used in the RCS/LFST specimens is demolished concrete, the axial mechanical properties of these specimens are almost the same as those of the CFST specimens; and (b) the axial load bearing capacities of the RCS/LFST specimens calculated according to the domestic standard JCJ 01-89 are in good agreement with the test results.


Wu B.,South China University of Technology | Liu C.,South China University of Technology | Zhao X.,South China University of Technology | Liu Q.,Shenzhen General Institute of Architectural Design and Research
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2011

Quasi-static tests of seven double thin skin hybrid walls filled with demolished concrete lumps (DCLs) were conducted, the influences of various parameters (i. e., mix ratio of demolished concrete, thickness of steel plate, axial load ratio, rib plate spacing, height-width ratio) on the seismic behavior of specimens were investigated. Based on the concept of combined strength of new and old concrete, lateral load carrying capacities of the specimens were calculated approximately, and compared with those of reinforced concrete walls with similar total steel weight. Test results show that: (a) the influences of the mix ratio of demolished concrete within a range of 0~33% on the initial lateral stiffness, lateral load carrying capacity, destructive drift ratio, energy dissipation capacity, and shape of hysteretic curves of the specimens are limited; (b) the axial load ratio of a double thin skin hybrid wall filled with DCLs should be less than 0.35; (c) even the ratio of wall thickness to steel plate thickness is 120, the hysteretic behavior and deformation capacity of a double thin skin hybrid wall filled with DCLs are still well. Its ultimate drift ratio can meet the requirement of the Chinese seismic design code; (d) the energy dissipation capacity of a double thin skin hybrid wall filled with DCLs is similar to or a little larger than that of a reinforced concrete wall; and (e) in the case where the sectional area and total steel weight are close, the lateral load bearing capacity of a double thin skin hybrid wall filled with DCLs is similar to that of a reinforced concrete wall.


Wu B.,South China University of Technology | Liu W.,South China University of Technology | Liu W.,Shenzhen General Institute of Architectural Design and Research | Liu Q.,Shenzhen General Institute of Architectural Design and Research | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

Twenty thin-walled steel stub columns filled with demolished concrete segment/lump(DCS/L) or cast-in-situ concrete(CC) were tested under axial loading. The influence of such factors as type of demolished concrete(DC), mix ratio of DC, and strength difference between CC and DC, on measured load-deformation curves of the specimens were investigated. According to domestic and foreign formulas for concrete filled steel tubular column, the axial load bearing capacities of the specimens were calculated and compared with the test results. A comparison was conducted between the axial load bearing capacities of the specimens and those of reinforced concrete stub columns whose sectional dimensions and steel ratios were the same as those of the specimens. Test results show that: a) the axial load bearing capacity of the column filled with DCS is larger than that of the column filled with DCL when their mix ratios of DC are similar. b) the mix ratio of DC within the range of 25%-35% has little effect on the axial load bearing capacity of the column filled with DCL. c) the mix ratio of DC within the range of 35%-50% has little effect on the axial load bearing capacity of the column filled with DCS. d) within the ranges of mix ratio mentioned above, the axial load bearing capacities of the columns filled with DCS/L are close to those of the columns filled with CC when the strength difference between CC and DC is less than 15MPa.


Wu B.,South China University of Technology | Xu Z.,South China University of Technology | Xu Z.,Shenzhen General Institute of Architectural Design and Research | Liu Q.,Shenzhen General Institute of Architectural Design and Research | And 2 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2010

Tests were conducted for the shear behavior of 27 thin-wall steel tubular columns filled with demolished concrete segments/lumps (DCS/L) or cast-in-situ concrete (CC). The influences of such parameters as the type of demolished concrete (DC), the mix ratio of DC, and the axial load ratio and aspect ratio on measured load-deformation curves and ultimate shear strengths of the specimens were investigated. According to existing formulas for concrete-filled steel tubular columns, the shear strengths of the specimens were calculated and compared with the test results. Based on the test data, a formula was proposed for the shear strengths of thin-wall steel tubular columns filled with DCS/L. Test results show that: (a) with an increase of the mix ratio of DC, the ultimate shear strength of the thin-walled steel tubular column filled with DCS/L decreases gradually; (b) the ultimate shear strength of the thin-walled steel tubular column filled with DCS is larger than that of the column filled with DCL; and (c) for the thin-wall steel tubular columns filled with DCS/L, the shear strengths calculated using the formulas proposed for the ordinary steel tubular columns filled with concrete are in general less than those measured in the tests.


Wang Q.W.,Shenzhen General Institute of Architectural Design and Research | Zhou B.,Shenzhen General Institute of Architectural Design and Research | Niu D.S.,Shenzhen General Institute of Architectural Design and Research
Advanced Materials Research | Year: 2012

Shenzhen Stock Exchange (SSE) plaza, being constructed in Shenzhen of China, is a complex high-rise building with a raised podium above ground level. The podium extends outwards from the tower structure at a maximum cantilever span of 36 meters. The lifted podium is a new concept conceived by architects but a big challenge confronting structural engineers. In this paper, the structural systems, including tower lateral resisting system, podium supporting system, floor system and foundation, are introduced. In order to evaluate the structural performance under the action of three earthquake levels specified by Chinese code, three models using MIDAS, ETABS and ABAQUS have been built; the results from the three software presented. It has been shown that the performance targets of all three design earthquake levels can be attained.


Zheng W.-G.,Shenzhen General Institute of Architectural Design and Research | Xie Y.-C.,Shenzhen General Institute of Architectural Design and Research | Xue X.-B.,Shenzhen General Institute of Architectural Design and Research
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

Aiming at the case that there have been no efficient and mature pile foundations and corresponding construction methods for karst areas with poor and complex geological conditions for long time, the state-of-the-art of pile foundations applied in karst areas is summarized, and the selection of piles is discussed. A number of recommendations are proposed based on the practical engineering experience from the design and installation of the pile foundations in Aidi Garden Phase II and Shenglong Garden Phase II in Longgang of Shenzhen. Particularly, Aidi Garden Phase II, constructed in deep karst area, exploits the aging effect of clay for supporting precast piles. It adopts the prestressed concrete pipes as friction piles, which do not touch the karst and thus eliminate its adverse impact. On the other hand, Shenglong Garden Phase II is constructed in shallow karst area, where the prestressed concrete pipes are employed as end-bearing pile groups to form piled raft, dispersing the risk of unfavorable geology.

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