A novel titanosilicate zeolite was synthesized by a sequential treatment of ERB-1 with deboronation and atom-planting method to develop an epoxide catalyst. The Fourier transform infrared (FTIR) and the diffuse reflectance infrared Fourier transform (DRIFT) characteristic results reveal that the silanol hydroxyl nests generated by deboronation process are further consumed by the dehydrochlorination of TiCl4 during the atom-planting treatment. At the same time, the titanium species are incorporated into the framework of MWW structure. The energy-dispersive spectroscopy (EDS), ultraviolet-visible light (UV-vis), and ultraviolet resonance Raman spectroscopy (UVRRS) characterization results reveal that the amount and coordination states of the incorporated Ti species can be controlled by the atom-planting treatment time and temperature. The catalytic performance of the new titanosilicates in the epoxidation of 1-hexene with H2O2 and of cyclohexene with tert-butyl hydroperoxide is compared for the efficiency of Ti species in the hydrophilic and hydrophobic system. The catalytic results show the framework tetrahedral coordinated titanium species are more efficient for epoxidation than extra-framework octahedral Ti species.

The application of connection joints between a cross-shaped concrete filled steel tubular column and a steel beam can improve the seismic performance, which also provides an effective way for saving building space. In this paper, models and flexural capacity of the connection joint with and without side plates were designed and evaluated, respectively. A refined mechanical analysis model of a joint subjected to low-cycle reciprocating loading was established using the finite element software ABAQUS. The failure characteristics of the joints with and without side plates were compared. The influence of axial compression ratio, side plate height, and side plate thickness on the flexural capacity of joints with side plates was studied. Moreover, the failure mode and force transfer mechanisms of these joints were analyzed. Based on the results of the finite element analysis (FEA), the ultimate tensile capacity of the steel tube column flange to the steel beam was calculated according to the yield line theory; the tension transmitted by the side plate was simplified for calculation via the static equilibrium method. Subsequently, the formula for calculating the flexural capacity of the joint with side plates is established. The results show that the ultimate bearing capacity of the joint was increased by 41.5% due to side plates effect, which decreased with an increasing axial compression ratio. Moreover, the ultimate bearing capacity of the joints increase slightly with an increase of height and thickness of the side plate, and the maximum increase was only 6.2%. In addition, the calculated results obtained by the proposed formula of ultimate flexural capacity are consistent with the results of the FEA.

To study fire after the mechanical performance of steel girder node special-shaped concrete-filled steel tube column, based on standard ISO - 834 litres of cooling curve, the node temperature field model was established based on finite element software ABAQUS, the compute nodes in the overall uniform temperature field under fire as a result, the reasonable choice of fire after the steel and concrete constitutive model, the temperature field results into the node stress model, considering the factors that influence the whole effect of fire loading in low cycle, the nodes of the finite element model, and contrast analysis of the temperature after the fire of the node and hysteretic performance and ultimate bearing capacity. The results show that the failure modes of special-shaped CFST column-steel beam joints at room temperature and after fire are the same, and the ultimate bearing capacity of the joints after fire decreases significantly by 14.88% compared with that at room temperature.