scholarly journals Experimental and Theoretical Study on Bearing Capacity of Conical Shell Foundations Composed of Reactive Powder Concrete

2015 ◽  
pp. 411-426 ◽  
Author(s):  
Mohammed Y. Fattah
Keyword(s):  
Bearing Capacity ◽  
Conical Shell ◽  
Theoretical Study ◽  
Reactive Powder Concrete ◽  
Reactive Powder ◽  
Shell Foundations

Influence of Axial Compression Ratio on Seismic Behavior of Reactive Powder Concrete (RPC) Beam-Column Joints

2014 ◽  
Vol 597 ◽  
pp. 312-315 ◽  
Author(s):  
Yan Zhong Ju ◽  
Chun Yu Li ◽  
De Hong Wang
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Compression Ratio ◽  
Seismic Behavior ◽  
Ultimate Bearing Capacity ◽  
Reactive Powder Concrete ◽  
Element Analysis ◽  
Axial Compression Ratio ◽  
Reactive Powder ◽  
Axial Compressive Ratio

To explore the influence of axial compressive ratio on seismic behavior of reactive powder concrete(RPC) beam-column joints,this paper carry out RPC beam-column joints nonlinear finite element analysis,using software ABAQUS.The effect of different axial compression ratio on the ductility,energy dissipation capacity and bearing capacity are studied,based on hysteretic curves and skeleton curves of the components.The results show that,with the increase of axial compression ratio,skeleton curves of the components tend to be steep when the vertical load of beam ends exceed the peak point.The ultimate bearing capacity of the components are improved with the increasing of axial compression ratio which is less then 0.6,while the ultimate bearing capacity show a opposite trend when the axial compressive ratio exceed 0.6.

Ultimate bearing capacity of conical shell foundations

2014 ◽  
Vol 52 (3) ◽  
pp. 507-523
Author(s):  
J.E. Colmenares ◽  
So-Ra Kang ◽  
Young-Jin Shin ◽  
Jong-Ho Shin
Keyword(s):  
Bearing Capacity ◽  
Conical Shell ◽  
Ultimate Bearing Capacity ◽  
Shell Foundations

Behavior of CFRP-confined reactive powder concrete-filled steel tubes under axial compression

2020 ◽  
pp. 136943322097478
Author(s):  
Song Li ◽  
Chu-Jie Jiao
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Local Buckling ◽  
Steel Tube ◽  
Experimental Results ◽  
Reactive Powder Concrete ◽  
Test Results ◽  
Steel Tubes ◽  
Reactive Powder ◽  
Concrete Filled Steel Tubes

Reactive powder concrete-filled steel tubes (RPCFSTs) have become an important research target in recent years. In engineering applications, RPCFSTs can provide superior vertical components for high-rise and tower buildings, thereby enabling developers to provide more floor space. However, this type of composite structure is prone to inelastic outward local buckling. The use of carbon fiber reinforced polymer (CFRP) wrapping to suppress such local buckling has shown great potential in limited test results. This paper presents experimental results concerning the axial compression of CFRP-confined reactive powder concrete-filled circular steel tubes (CF-RPCFSTs). We included 18 specimens in our experimental investigation, varying the number of CFRP layers, steel tube thickness, and RPC strength. According to our test results, CF-RPCFSTs exhibit compression shear failure and drum-shaped failure. The CFRP wrap can effectively enhance bearing capacity and postpone local buckling of the steel tube. In addition, three-layer CFRP-confined RPC-filled thin-wall steel tubes are suitable for engineering. We also propose a model to calculate the bearing capacity of CF-RPCFSTs. Compared to the existing model of CFRP-confined concrete-filled steel tubes, the results obtained using the proposed model are in good agreement with our experimental results.

scholarly journals Comparative Study on the Axial Compression and Bearing Capacity of Reactive Powder Concrete-Filled Circular Steel Tube

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Mingyang Chen ◽  
Xiaomeng Hou
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Limit Equilibrium ◽  
Steel Tube ◽  
Ultimate Bearing Capacity ◽  
Reactive Powder Concrete ◽  
Fiber Volume ◽  
Loading Mode ◽  
Circular Steel Tube ◽  
Reactive Powder

Reactive powder concrete (RPC) was confined by the circular steel tube to obtain the required ductility. The axial compression test results of 139 columns from different scholars were collated and compared to study the axial compression and bearing capacity of a reactive powder concrete-filled circular steel tube, of which the confining coefficient is 0.057–2.312 and the RPC strength is 76.6–178.2 MPa. Load-displacement curves have been categorized into four stages: (1) elastic; (2) elastic-plastic; (3) descending; and (4) strengthening. The failure mode can be divided into three types according to the different confining coefficients as (1) wall buckling; (2) diagonal shear; and (3) drum-shaped. The confining coefficient, core RPC strength, steel fiber volume, steel tube D/t ratio, and loading mode on the ultimate bearing capacity were analyzed. The results showed the confining coefficient to be the main factor affecting ultimate bearing capacity. The equation for determining ultimate bearing capacity was established based on the limit equilibrium theory, with the lateral confining coefficient of RPC (k) determined to be 2.86, less than that of normal concrete at 4.1. Based on the experimental analysis results and China’s “Design and Construction Code for Concrete-Filled Steel Tube Structure” (CECS 28-2012), the design proposal for an RPC-filled steel tube was recommended.

Ultimate Bearing Capacity of Steel-Reactive Powder Concrete Composite Beams

2014 ◽  
Vol 900 ◽  
pp. 473-482 ◽  
Author(s):  
Li Zhong Han ◽  
Jin Quan Zhang ◽  
Jian Guo Nie
Keyword(s):  
Bearing Capacity ◽  
Concrete Slab ◽  
Composite Beams ◽  
Ultimate Bearing Capacity ◽  
Reactive Powder Concrete ◽  
Width Ratio ◽  
Critical Crack ◽  
Negative Moment ◽  
Reactive Powder ◽  
Tension Strength

Concrete slab in the negative moment area of continuous steel-concrete composite beams is prone to crack due to the low tension strength of common concrete, which could result in the decreasing of the strength and durability. To solve this problem, a method of replacing the concrete slab with reactive powder concrete (RPC) slab which is of super high strength, durability, toughness and volume stabilization is presented. According to the constitutive relation and the high tension strength of RPC, the normal section failure mode is defined as the critical crack state, and the calculation formula of ultimate bearing capacity is deduced. Finally, some parameters that influence the ultimate bearing capacity are analyzed, such as the height ratio of RPC slab to whole beam, width ratio of RPC slab to steel beam, and the ratio of reinforcement of RPC slab. Compared with the steel-concrete composite beams, it is indicated that in the precondition of RPC slab unallowable crack in negative moment area, the ultimate bearing capacity of steel-RPC composite beams can still be increased, and the crack resistance, stiffness and durability can all be enhanced greatly.

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