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The objective of the rehabilitation is to upgrade the shear strength of these joints and reduce the potential for bond-slip of the bottom bars of the beam.
Longitudinal bars of the beam and the column are modelled using discrete truss element.
Flexural cracks were concentrated at the south interface of the beam and the column stub that caused fractures in the lower bars of the beam.
The specimens were exposed to monotonic downward vertical displacement at the middle column stub until fractures occurred in the lower and upper bars of the beam.
Subsequently, at a drift level of 5%, several thin vertical and horizontal cracks appeared in the joint panel zone; in addition, flexural cracks appeared at the widened beam column interface, which was attributed to the slippage of the bottom reinforcing bars of the beam.
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Fourteen ordinary strain gauges were attached to the longitudinal and transverse reinforcing bars of the beams and columns around the joint panel zones to measure the steel strains developed during different loading stages.
Moreover, the drift ductility of the retrofitted specimens did not considerably differ from that of J-0. Figure 18 shows the strain profiles for longitudinal re-bars of the beams obtained from the test results.
One of the lower bars of the south beam next to the middle joint fractured at a displacement of 276 mm, corresponding to a load of 53 kN.
Nevertheless, as shown in Table 2, the load percentages of the flexural cracking and the yielding of longitudinal bars of the three beam specimens are about 11 13 and 57 60%, respectively, which means that the combined effects of bending, shear and torsion on these two characteristic factors seems similar.
Due to the inherent characteristics of the four-bar linkage of the beam pumping units, although the torque balance reaches the industry standards, it still has many disadvantages, such as poor balance effect, bigger fluctuation of gearbox torque, existence of negative torque, lower work efficiency, bigger consumption of energy, phenomenon of "a big horse pulls a small carriage".
Substituting the value of ( v_{u} ), the geometric dimensions and the properties of steel bars of the frame beams on the A-axis into Eq. (1), the progressive collapse resistance of frame beams (( P_{text{ub}} )) can be calculated 41.5 kN.
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