Systems of ODEs arising from transient structural dynamics generally exhibit high-frequency/low-frequency and linear/nonlinear behaviours of subsets of state variables. This paper resorts to the use of different time integrators with different time steps for subsystems, to tailor each method and its time step to the solution behaviour of the corresponding subsystem. Anovel partitioned integration method with the acceleration continuity is proposed whose velocity continuity is also ensured by means of the mass projection strategy. Both its stability and accuracy properties are examined through numerical analysis on Single-DoF split mass system.

Dynamic simulations of structures to determine their seismic performance is an essential part of civil engineering research. Time integrators of increasing sophistication has been elaborated over the last few decades to achieve higher order accuracy, unconditional stability, computational efficiency and high-frequency dissipation. This paper tries to extend 1-stage Rosenbrock-based integrator to an integrator of second-order accuracy without losing computational efficiency and unconditional stability. Initially, 1-stage Rosenbrock integrator is introduced and its order of accuracy is studied theoretically. According to accuracy analysis, a force term at the end of current step is considered, resulting a novel integrator of second-order accuracy. Moreover, the stability of the proposed method is studied by means of the energy method. To investigate its performance for nonlinear structures, numerical simulations are conducted on a shear-type structure including a pendulum.

With the development of curtain wall in super high-rise buildings which promoting the application of embedded part. In this paper, the experimental research on the tensile, shear properties of a kind of channel type embedded part which has been disposed through a hot extrusion forming new technology. The mechanical properties, deformation and damage form of embedded parts were investigated.Experimental results indicate that it has good mechanical properties and favorable deformation performance under tensile and shear loads in normal work. Under effect of tension, the circular anchor nail was pulled-off from channel and the bottom junction between square anchor nail and channel was tore were the main failure forms. Otherwise, when under the effect of shear, the bolts were sheared fracture. The results of experiment could provide experimental basis for channel embedded part with wide application in engineering.

Combined with powerful mathematical capability of MATLAB and the excellent interfacial design function of GUIDE, a lifting optimization decision system for multiple-lifts-single-crane is proposed which is feasible in electrical equipment lifting tasks. Based on existing approaches, a novel algorithm is proposed for selecting appropriate cranes and determining their corresponding optimum locations, resulting a lifting optimization system. This system can minimize the number of crane locations on the premise of avoiding potential spatial conflicts. To investigate its performance, a case example is conducted. It is demonstrated that the utility of this system for multiple-lifts-single-crane lifting tasks which also allow users have a deeper intuitive judgment to the lifting process.

Generally, a substation involves a great many components, i.e., electrical equipment and precast elements, of large dimension and weight. Its lift planning has a major impact on construction sequence, scheduling, budgeting and safety. An optimization method for the scenario of single-cane-multiple-lifts is presented, mainly considering the objective to minimize the number of crane relocations. The method starts with identifying possible location zones by means of the constrained work envelope strategy and the grid traversal algorithm. Later, it adopts the multiple-target integer programming method to minimize the number of location zones that can lift all components, and then to maximize the total number of components that the available zones can lift including duplication. For each optimized zones, it checks the optimal location by means of the traversal algorithm, considering the minimum of the sum of the weighted load factors for all components. To avoid spatial interference, an automatic simulation is done by means of which any missing interference can be checked manually. Lastly, a case study is done to demonstrate the validity and practicality performance of the method.