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Aluminum conductor composite core has many technical advantages such as high tensile strength, light weight, low sag, large current carrying capacity. In order to study the influence of the broken of aluminum conductor composite core on the transmission tower, tower-line model was built by using the finite element software ANSYS/LS-DYNA, and the deformation of joints and stress of bar were analyzed. The impact load and the impact coefficient of the representative bars of the transmission tower are calculated. The results show that the impact acting on the tower is the most serious in the place of the conductor suspension point, the connection of upper and lower crank arms, the tower neck.

To study the bond–slip behavior between reinforcing bars and reactive powder concrete (RPC), eccentric pull‐out tests of 20 groups of bonding specimens were conducted, and the variables in the test specimens included RPC strength, cover thickness, bond length, and reinforcing bar diameter. The effects of various parameters on the bond stress and peak slip were analyzed. A formula for calculating the average bond stress and between the reinforcing bar and RPC were established, and the bond–slip relationship between reinforcing bar and RPC was determined. The results indicated that the bond length had the most significant effect on the bond performance, followed by the strength of concrete, cover thickness, and reinforcing bar diameter. When the bond length increased from 3d to 4d, the average bond stress decreases by 13.2% to 23.7%. When reinforcing bar diameter increased from 16 to 20 and 25 mm, the average bond stress increased by 6.58% and 15.9%, respectively. The average bond stress increased with increase of the cover thickness. When the RPC strength increased from 105.2 to 124.8 MPa, the average bond stress increased by 7.0% to 13.2%. [ABSTRACT FROM AUTHOR]

By applying static load tests and the finite element analysis method, this study assesses the load-bearing performance and load transfer mechanism of squeezed branch piles. This study also compiles data and discusses findings about the distribution of field displacement, the development of a plastic zone in the soil, and the influence of branch quantity and horizontal load on the vertical bearing capacity. The results show that the axial force of the squeezed branch pile changes obviously at the site of the squeezed branch. Additionally, this study identifies the sequenced effects of frictional resistance; the displacement patterns of the soil around the pile, particularly below the branch and pile tip; the minimum center distance between piles in a group, which should be greater than 1.5 times the branch diameter; and the location of plastic strain in the soil below the branches and pile tip. The data reveal that the vertical bearing capacity of squeezed branch pile is 16 to 30% higher than that of normal pile under the same conditions; furthermore, the vertical bearing capacity of squeezed branch pile increases as the number of branches and horizontal load increase. Considering geological engineering conditions and loading requirements, it is advisable to identify an optimum branch quantity for the specific bearing stratum; in this case, the optimum branch quantity was 1 to 3. [ABSTRACT FROM AUTHOR]

To explore the seismic performance of reactive powder concrete (RPC) column, the quasi-static test of 18 RPC columns are carried out. The factors affecting the column failure patterns, hysteretic characteristics, skeleton curves, rigidity, bearing capacity and ductility were analyzed in this paper, which included axial compression ratio, longitudinal reinforcement ratio, stirrup ratio and steel fiber volume content. The results show that, the bearing capacity of reinforced RPC columns increases, but the ductility decreases with the increase of axial compression ratio. The bearing capacity and displacement ductility coefficient of reinforced RPC columns significantly increases with the increase of longitudinal reinforcement. The stirrup ratio has large influence on the hysteretic behavior of reinforced RPC columns and the skeleton curve flattens out as load exceeds the peak point. The steel fiber volume content has large influence on fracture process of RPC columns, with the increase of steel fiber content, and the ductility of reinforced RPC columns can be improved to a certain extent. [ABSTRACT FROM AUTHOR]