Abstract
This paper predicts the tension strength of Concrete-filled Branch Plate-to-Rectangular Hollow (CBPRH) joint by conducting experimental and theoretical analysis. A total of 46 X-joints with different geometric parameters were investigated, in which 4 specimens were tested under ultimate tension and 42 specimens were numerically analyzed. The joint’s strength, failure mode and load-displacement curve were obtained. Perfobond Leister Rib (PBR) was welded in part of the specimens to investigate its effect on joint’s tensile performance. It is shown that the ultimate strength of transverse CBPRH joint benefit from grouting of chord and installation of PBR. The ultimate strength of CBPRH joint with PBR is larger than the counterpart without PBR. Tension strength equations were proposed for both CBPRH joints with and without PBR by nonlinear regression. The chord axial stress reduction factor was discussed and a modified equation originated from hollow joint was recommended for CBPRH joint. Connection efficiency was presented and compared among branch plate-to-rectangular hollow (BPRH) joint, CBPRH joint and CBPRH joint with PBR.
Highlights
Branch Plate-to-Rectangular Hollow (BPRH) joint has been widely implemented in various structures
Among the parameters of Concrete-filled Branch Plate-to-Rectangular Hollow (CBPRH) joint with Perfobond Leister rib (PBR), at given β, τ is more sensitive than b1/t1 as shown in Fig. 15(a), at given b1/t1, β is more sensitive than τ as shown in Fig. 15(b). (a) β=0.6 (b) b1/t1=15 Figure 15: Connection efficiency of CBPRH joint with PBR In general, connection efficiency comparison indicates that grouted concrete and PBR are quite effective in improving the strength of BPRH joint
Ultimate test of longitudinal CBPRH joint with PBR was carried out, which has been used to validate against FE modeling for transverse CBPRH joint
Summary
Branch Plate-to-Rectangular Hollow (BPRH) joint has been widely implemented in various structures. Welding Perfobond Leister rib (PBR) in chord face in Tab. 1 and concretefilling have been found to be the significant alternatives to improve tension strength for RHS by the authors [14,15]. When it comes to BPRH joint, PBR’s effect may be similar as to the RHS joint. In order to investigate the effects of concrete-filling and PBR reinforcement of transverse CBPRH joint, firstly, a review of transverse BPRH tension strength was made. Experiment on concrete-filled RHS X joint (CRHS) with PBR has indicated that the failure mode presents. Tension strength of the transverse CBPRH joint has not been reported in the earlier published studies
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