Guangzhou CRUPE Systems Building Materials Co.

Guangzhou, China

Guangzhou CRUPE Systems Building Materials Co.

Guangzhou, China
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Liu B.,Xi'an University of Architecture and Technology | Hao J.,Xi'an University of Architecture and Technology | Zhong W.,Xi'an University of Architecture and Technology | Wang Y.,Xi'an University of Architecture and Technology | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

Cold-formed thin-wall steel framing wall with sprayed thermal insulation material, in which polystyrene boards are placed in region of the cold-formed thin-wall steel frame and sprayed light thermal insulation materials is used outside the frame of the wall, is presented in this paper. Through tests of one cold-formed thin-wall steel frame and two cold-formed thin-wall steel framing walls with sprayed thermal insulation material under low reversed cyclic loading, the failure process and pattern were observed. The mechanical behavior such as hysteretic loops, skeleton curves, load carrying capacity, lateral stiffness and ductility were analyzed. The experimental data of specimens presented in this paper and cold-formed thin-wall steel framing walls with sheathing on both sides were compared. The results indicate that cold-formed thin-wall steel frames can not be used as lateral force-resisting members individually due to the weak stiffness of connections and low load carrying capacity. As a result of spraying light thermal insulation material continuously, the integrity of walls with sprayed thermal insulation material is improved. Compared with walls with sheathing on both sides, walls with sprayed thermal insulation material, which improve the load carrying capacity and lateral stiffness greatly, have good seismic behavior.


Hao J.,Xi'an University of Architecture and Technology | Liu B.,Xi'an University of Architecture and Technology | Shao D.,Xi'an University of Architecture and Technology | Li K.,Xi'an University of Architecture and Technology | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

Through tests of one cold-formed thin-walled steel strap-braced frame and two cold-formed thin-walled steel strap-braced framing walls with sprayed lightweight mortar under low reversed cyclic loading, the failure modes and mechanical performance of specimens in loading process were observed. The mechanical characteristics such as hysteretic loops, skeleton curves, ductility, lateral stiffness, stiffness degradation, strength degradation and strain variation of steel members were analyzed. A comparison was made on the difference of the shear capacity between walls with X-shaped steel strap bracings and walls with diagonal bracings. The results indicate that the cold-formed thin-walled X-shaped steel strap-braced frame, in which only tensile steel straps could provide the lateral resistance, exhibits the global flexural-torsional buckling and local buckling of studs. Owing to the interaction between steel frames and lightweight mortar outside the frame of the wall, the bearing capacity and lateral stiffness of composite walls increase significantly and the ductility is improved as well. The out-of-plane deformation of compressive steel straps is restrained by lightweight mortar outside the frames. The final failure modes of walls are local buckling at the bottom of side studs and the slip between the steel frames and lightweight mortar on both sides. Besides, the unit yielding load of walls with X-shaped steel strap bracings is increased by 15%~20% than those with diagonal bracings. ©, 2014, Science Press. All right reserved.


Hao J.,Xi'an University of Technology | Wang Y.,Xi'an University of Technology | Liu B.,Xi'an University of Technology | Li K.,Xi'an University of Technology | Zhao Q.,Guangzhou CRUPE Systems Building Materials Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2014

The cold-formed thin-wall steel framing wall with sprayed lightweight mortar is a new type of characteristic of wall that a frame made of cold-formed thin-wall steels that is filled with expanded polystyrene sheets (EPSs) in the lattices and spray lightweight mortar onto the gaps between the frame and EPSs and surfaces of the wall. Three studs in the cold-formed thin-wall frames were tested and analyzed in this paper to study the bearing capacity and failure patterns under axial force of this new structure. Compared with the test results on the wall studs with double wallboards, it shows that the new type of studs have better bearing capacity and good wholeness. Compared with the calculated values that use the effective section method, it shows the effective section method is conservative. The failure mechanism of the cold-formed thin-wall steel framing wall studs is the buckling at the top of the studs. It is also tested on the bond slip property between the galvanized steel plates and lightweight mortar, showing that the average bond strength is 0.266 MPa. The parameters of depth of steel plate in the mortar and the thickness of mortar have little effect on the average bond strength. ©, 2014, Science Press. All right reserved.


Liu B.,Xi'an University of Architecture and Technology | Hao J.,Xi'an University of Architecture and Technology | Li K.,Xi'an University of Architecture and Technology | Wang Y.,Xi'an University of Architecture and Technology | Zhao Q.,Guangzhou CRUPE Systems Building Materials Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

Through tests of four full scale specimens of cold-formed thin-wall steel framing walls with sprayed lightweight mortar, the influence of the type of cold-formed thin-wall steel frames and axial compression ratio of studs on the shear resistance of walls were investigated. The failure process and pattern of specimens are observed. The mechanical behavior, such as bearing capacity, lateral stiffness, ductility, stiffness degradation and strength degradation are studied. The design values of cold-formed thin-wall steel framing walls with sprayed lightweight mortar are initially discussed. The results indicate that the main failure modes of walls are local compressive buckling at the bottom of side studs and the slips between the steel frames and lightweight mortar on both sides. The lateral stiffness is little affected by diagonal braces, while the shear capacity of the wall increases if the joints are strengthened. Meanwhile, with the increase of axial compression ratio of studs, the lateral stiffness could be improved, but the bearing capacity and ductility are reduced slightly. Based on the principle of equivalent safety coefficient and experimental data, the design values of cold-formed thin-walled steel framing walls with sprayed lightweight mortar are suggested initially under frequently occurred horizontal earthquake actions. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.

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