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Xu Y.,Harbin Institute of Technology | Wang P.,RBS Architecture Engineer Design Associates
Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering | Year: 2012

A simplified calculation method on the basis of Newmark β is used to solve the nonlinear problem during the car crashing wave-beam semi-rigid barrier process. Time-history analysis is carried out by the simplified models with and without considering rotational in-plane degree-of-freedom. Compared with the LS-DYNA finite element simulation, it shows that the simplified calculation method can provide accurate time-domain analysis for the collision process by considering two translational and one rotational in-plane degree-of-freedom. The simplified calculation method helps the barrier designer to understand the collision process more clearly and make the barrier design more reasonable. Source

Hu H.-S.,Huaqiao University | Nie J.-G.,Tsinghua University | Fan J.-S.,Tsinghua University | Tao M.-X.,Tsinghua University | And 2 more authors.
Journal of Constructional Steel Research | Year: 2016

Concrete-filled steel tube-enhanced steel plate-reinforced concrete (CFST-SPRC) shear walls have been proposed for use in super high-rise buildings. This paper presents an experimental study of CFST-SPRC shear walls that aims to evaluate their seismic behavior. Three CFST-SPRC shear wall specimens with varying steel plate thicknesses and concrete strengths were tested under constant axial force and reversed cyclic loading. All of the specimens experienced a progression of failure from web concrete cracking, to local buckling of the steel tube plates, to fracturing of the vertical welds at the corners. One specimen exhibited brittle failure at the end of testing due to the sudden crushing of web concrete. Stable and full hysteretic behavior was developed by the shear wall specimens, indicating a capability for stable energy dissipation. The ultimate drift ratios were around 1.7% for all of the specimens. The flexural and shear deformations of the shear walls, and the base rotation caused by local deformations in the foundation beam, all provided a negligible contribution to the total lateral displacement. The proportions of the flexural displacement, shear displacement and rotational displacement to the total displacement were around 0.6, 0.2 and 0.2, respectively, for all specimens throughout the loading process. Simplified design methods were proposed for evaluating the load-carrying capacities of CFST-SPRC shear walls. The proposed method provided reasonable but conservative estimations for the test shear wall specimens. © 2015 Elsevier Ltd. All rights reserved. Source

Li S.,RBS Architecture Engineer Design Associates | Nie J.,Tsinghua University | Liu F.,RBS Architecture Engineer Design Associates | Hu H.,Tsinghua University | And 3 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

The core tube of a super high-rise building is used to study the aseismic behavior of a new developed high-strength concrete filled double-steel-plate composite shear wall. Eight 1:7 scaled models and three 1:12 scaled models were tested under cyclic loading. The test parameters were steel content ratios, concrete strength, proportion of steel plates of boundary columns, wall body and shear span. The specimens exhibited high deformation capacities under high axial compressive forces. The average value of the ultimate drift ratios for all the specimens was 1/64. Local buckling of the steel plates was not evident for most specimens, except the specimens with 3 mm steel plate. The horizontal welds between the surface steel plates and the end plates were fractured in the six specimens, which decreased the actual deformation capacities of the specimens. The proposed strength calculation method can give a good and conservative prediction. The anchorage method of the composite shear wall, the connecting configuration between the surface steel plates and the infill concrete are also discussed, and some design recommendations are given. Source

Nie J.,Tsinghua University | Hu H.,Tsinghua University | Li S.,RBS Architecture Engineer Design Associates | Liu F.,RBS Architecture Engineer Design Associates | And 4 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

This paper presents experimental study on the seismic behavior of steel plate reinforced high-strength concrete composite shear walls with square concrete filled steel tube concealed columns. Three specimens with shear-span ratio of 2.0 and designed axial compression ratio of 0.5 were tested under cyclic loading. The variable parameters were concrete strength and steel ratio. The results indicate that the failure patterns of the tested walls includ fracture of the vertical weld between adjacent steel plates, crushing of the concrete in the concealed columns, local buckling of the outside steel plates. The exposed concrete in the middle of the tested walls don't crack seriously. All the three tested walls exhibite good hysteretic behavior and high energy dissipation capacity. The equivalent viscous damping coefficient at the ultimate state is about 0.22 for all the specimens. The average values of the yield drift angle, ultimate drift angle and ductility factor for the three tested walls are 1/214, 1/58 and 3.77, respectively. The ratio of the top displacement due to flexure deformation and shear deformation kept nearly constant during the whole loading process, and the top displacement due to shear deformation is about 20% of the total top displacement. Source

Nie J.-G.,Tsinghua University | Hu H.-S.,Tsinghua University | Fan J.-S.,Tsinghua University | Tao M.-X.,Tsinghua University | And 2 more authors.
Journal of Constructional Steel Research | Year: 2013

In order to improve the ductility of the core wall in super high-rise buildings subjected to high axial compressive force and seismic effect, a new detailed concrete filled double-steel-plate (CFDSP) composite wall using high-strength concrete is proposed. This CFDSP composite wall is composed of concrete filled steel tubular columns at the two boundaries and concrete filled double-steel-plate wall body which is divided into several compartments by vertical stiffeners transversely connected by distributed batten plates. In order to intensively investigate the structural mechanism of this new type of CFDSP composite walls, twelve specimens are tested under large axial compressive force and reversed cyclic lateral load. No evident buckling of surface steel plates can be observed due to reasonable width-to-thickness ratios of steel plates and properly arranged batten plates, so that the surface steel plates and infill high-strength concrete can work compatibly in the whole loading process. All the specimens exhibited good energy dissipation ability and deformation capacity with full hysteretic curves and large ultimate drift ratios, thereby indicating that high-strength concrete can be used in seismic-resistant structures when the proposed new detailed walls are adopted. Based on the test results, the stiffness and strength degradations are analyzed, and the deformation characteristics of all the specimens are discussed in detail. Finally, a strength prediction approach based on the section analysis method is presented, and some detailing requirements for routine design practice are recommended. © 2013 Elsevier Ltd. All rights reserved. Source

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