On the other hand, M5 Tree provided the most inaccurate strength and strain estimates. (9) [PERSON]; et al. Soil-Structure-Equipment Interaction and Influence Factors in an Underground Electrical Substation under Seismic Loads [PERSON] _et al._ (2010). This paper proposes a seismic response analysis method for underground electrical substations considering the soil-structure-equipment interactions, which is performed by changing the earthquake input motions, soil characteristics, electrical equipment type and structure depths. The numerical results indicate that: (a) as a boundary condition of soil-structure, the coupling boundary is feasible in the seismic response of an underground substation; (b) the seismic response of an underground substation is sensitive to burial depth and elastic modulus; (c) the oblique incidence of input motion has a slight influence on the horizontal seismic response, but has a significant impact on the vertical seismic response; and (d) the bottom of the side wall is the seismic weak part of an underground substation, so it is necessary to increase the stiffness of this area. (10) [PERSON]; et al. Base Pounding Model and Response Analysis of Base-Isolated Structures under Earthquake Excitation [PERSON] _et al._ (2010). To study the base bounding effects of the base-isolated structure under earthquake excitations, this paper proposes a base bounding theoretical model with a linear spring-gap element. The numerical analysis conducted through this model suggests that: (a) the model offers much flexibility in analyzing base bounding effects; (b) there is a most unfavorable clearance width between adjacent structures; and (c) the structural response increases with bounding and consequently, it is necessary to consider base bounding in the seismic design of base-isolated structures. (11) [PERSON]; et al. Application of the Hybrid Simulation Method for the Full-Scale Precast Reinforced Concrete Shear Wall Structure [PERSON] _et al._ (2011). This paper proposes a new nonlinear seismic performance analysis method for the full-scale precast reinforced concrete shear wall structure based on hybrid simulation (HS). To be more specific, an equivalent force control (EFC) method with an implicit integration algorithm is employed to deal with the numerical integration of the equation of motion (EOM) and the control of the loading device. The accuracy and feasibility of the EFC-based HS method is verified experimentally through the substructure hybrid simulation tests of the pre-cast reinforced concrete shear-wall structure model. Because of the arrangement of the test model, an elastic non-linear numerical model is used to simulate the numerical substructure. The experimental results of the descending stage can be conveniently obtained from the EFC-based HS method. **Industrial application phase. ** Finally, based on both the theoretical and experimental academic research, the practical designs or optimum methods that are a valuable reference for actual engineering applications can be obtained. In this special issue, one paper proposes a design method for seismically isolated reinforced concrete frame-core tube tall building, while another paper puts forward an optimum method of tuned mass dampers for the pedestrian bridge, both of which are of great industrial interests. The papers in this category and corresponding comments are listed below:  
(12) [PERSON]; et al. Research on the Rational Yield Ratio of Isolation System and Its Application to the Design of Seismically Isolated Reinforced Concrete Frame-Core Tube Tall Buildings [PERSON] _et al._ (2010). This paper proposes a high-efficiency design method based on the rational yield ratio of the isolation system and applies it to the design of the seismically isolated reinforced concrete (RC) frame-core tube tall buildings. The main contributions of this paper are as follows.