Vehicle-assisted bridge damage identification has great application potential，but it is still difficult to extract damage-sensitive features from multi-source monitoring data and accurately evaluate the bridge damage status. To solve this problem，an Attention-LSTM-based Feature Fusion Model （ALFF-Net） is proposed. The model improves the perception ability of Bi-LSTM cells for multi-scale feature information in time series data through a preset data reconstruction layer. Furthermore，by employing attention mechanism and feature fusion strategy，the model reduces the prediction difficulty of downstream branches of deep neural networks and further improves the modeling ability for the important dependency relationships in the sequence data. A monitoring dataset under different road roughness and vehicle speeds is generated through a vehicle-bridge interaction system simulation，and the bridge damage identification performance of the ALFF-Net model is comprehensively tested. The results show that the ALFF-Net model improves the damage identification accuracy by up to 19.30% compared to the classical LSTM network while significantly reducing computational costs，and the identification errors under different road roughness levels are less than 3%. Moreover，by comparing the identification accuracy of the ALFF-Net model under different data-driven schemes，the robustness of the bridge damage detection results with synergistic multi-source monitoring data is verified.

Based on the dynamic response caused by moving vehicles，a recurrence quantification analysis-based structural damage detection method is proposed. The acceleration response is split into several segments using a moving window. The recurrence plots are constructed to analyze and present the characteristics of each segmented response signal. The recurrence quantification analysis is used to quantify the damages and construct the damage feature. The damage features of each relative position are assembled as a vector for the location of the structural damage. The proposed method is validated by numerical simulation with the single-damage and multi-damages. The influence of damage location，vehicle speed，noise and other factors are discussed to illustrate the robustness of the proposed method. Results show that the method is a potential way for structural damage detection under operational condition.

Based on the measured acceleration response under Typhoon Kompasu，the modal parameters of the 356 m Shenzhen Meteorological Gradient Tower （SMGT） are identified. The Non-dominated Sorting Genetic Algorithm Ⅱ（NSGA-Ⅱ），which is a fast and elitist genetic algorithm，is applied to update the finite element （FE） model of SMGT. The results show that the vibration modes of SMGT are very dense，and the involvement of cable vibration modes is obvious. The fundamental frequencies of SMGT in X and Y directions are 0.614 Hz and 0.603 Hz，respectively，and the damping ratio of the first 3 order bending modes are about 1%~2%. The tower density and cable elastic modulus have a significant effect on the modal frequency and mode shape of SMGT，the lineic mass of high-rise cable and tower elastic modulus also have a certain influence，while the cable tension has a relatively low influence on the modes of SMGT. The wind-induced response of the updating FE model is higher than that of initial model，and closer to the actual measurement，which verifies the accuracy of the updating FE model.

In recent years，inflatable membrane structures with rectangular planes have been widely used in large-span coal bunkers and other facilities. However，the wind-induced vibration coefficients for these structures are not provided in design standards. In this paper，the wind loads on inflatable membrane structures with rectangular planes for typical rise-span ratios are obtained through wind tunnel tests. The wind-induced responses are calculated via a nonlinear dynamic time-history analysis method. The influences of different parameters such as wind velocity，wind direction，span，rise-span ratio，and internal pressure on the deformations and extreme responses are investigated. The results show that the mean structural deformation is characterized as concave on the windward and leeward regions and convex on the top and side regions. The spatial distributions of extreme responses are significantly influenced by the structural parameters and wind directions. Additionally，the wind-induced responses are positively correlated with the spans and rise-span ratios. The structural wind resistant performance can be strengthened by enhancing internal pressure to some extent. The internal pressure is recommended between 400 and 500 Pa. The wind-induced vibration coefficients of displacement and stress are provided for engineering reference.

The vibration of high-rise tower structure requires active control. However，the problem of direct displacement observation and high-efficient low-dimension control strategy under single point needs to be solved. In this paper，a set of real-time continuous observation method of displacement from the inside of the tower is established by using modern video metrics technology，which provides the most direct displacement observer for the active control of the high tower. It avoids the tedious calculation process of building an acceleration observer，and then combining with the assumed external load to calculate the displacement after filtering. By using the equilibrium system space transformation and the equilibrium truncation method，a low-dimension controller is established with AMD at the top of the tower，which can effectively preserve the main dynamic characteristics of the structure. Taking a 700-meter-high tower under construction as an example，the active control simulation analysis under wind-induced vibration and earthquake is carried out. The results show that the control effect of the low-dimension controller with a few displacement states as feedback is basically the same as that of the full-dimension controller based on full state feedback，which can be used as an active control strategy for high tower structures.

The long-span continuous beam bridge with parallel twin steel box decks is common in engineering practice，but the complex vortex shedding and interaction of parallel twin steel box girders may cause significant vortex-induced vibration （VIV），affecting the fatigue performance of the structure，driving comfort，and possibly causing social panic. This paper takes parallel twin box girders as the research background，and a large-scale segment model vibration and pressure measurement wind tunnel test is carried out. The evolution characteristics of the distributed aerodynamic force in the entire vertical bending vortex vibration process （before the vortex vibration，the ascending zone，the amplitude extreme point，the descending zone，and the end of the vortex vibration） under different spacings are compared，and effective aerodynamic measures to control the vortex vibration of the parallel twin box girders are proposed. The study shows that the vortex-induced vibration lock-in regime of the parallel twin steel box girders is long，the amplitude is large，+3° is the most unfavorable angle of attack （AOA） and the frequency multiplication effect of the vortex excitation force is related to the amplitude and the spacing between the box girders. When the spacing makes the inter-slot vortex fully developed，it significantly increases the pulsation of the aerodynamic force distributed near the slot. In the case of small spacing and low wind speed，the distributed aerodynamic force on the lee side of the upstream and downstream girders enhances the vortex-induced vibration. At large or small spacing with high wind speed，the distributed aerodynamic force on the upper surface near the slot and the position of the inclined web of the downstream girder plays a major role in enhancing the vortex-induced force，which is the inducement of the large amplitude of vortex-induced vibration of the parallel twin box girders. A comprehensive aerodynamic control measure of setting the apron between the slots and setting the wind fairing at both ends is proposed，which can cut off the propagation path of the vortex between the slots and reduce the contribution of the distributed aerodynamic force at the bridge deck. The measure can effectively reduce the vertical bending vortex-induced vibration of the parallel twin steel box girders.

Aiming at the problem that the existing analysis methods for the floating offshore wind turbine （FOWT） cannot efficiently predict the random dynamic response when considering the nonlinear coupling model，a fast calculation method of the random response of the FOWT nonlinear system under coupled wave excitation based on the statistical linearization algorithm is proposed，and its application in the vibration control of FOWT is studied. Taking the Spar FOWT as the object，a nonlinear model under the wave coupling excitation of 4-DOF is established based on the Lagrange equation，and the accuracy of the model is verified. On the basis of the established nonlinear model，a random vibration analysis method for this Spar FOWT based on statistical linearization algorithm is proposed，and the method is verified in many aspects. The results show that the method can improve the calculation efficiency by 4~5 orders of magnitude and has sufficient accuracy. The method is applied to the vibration control of the FOWT. The optimization of the control parameters and performance analysis of the FOWT under the control of TMD are efficiently realized，and the optimal control parameters of TMD are obtained. It is found that the vibration control effect of TMD on the FOWT tends to decrease gradually with an increase of the sea state level. In general，the proposed method has high accuracy，high efficiency and generality in different sea conditions，and also provides an efficient analysis method for the design optimization，fatigue analysis，reliability analysis and other research based on statistical characteristics of FOWT.

To explore the dynamic behavior mechanism between vibrating wheels and compacted pavement during subgrade vibration compaction. To provide theoretical support for continuous compaction monitoring technology and intelligent compaction of pavement. Based on the consideration of the mass of the vibrating soil，a 3-degree-of-freedom vibratory roller-soil coupling dynamic model is established. The nonlinear dynamic response characteristics of the vibratory roller vibration wheel in the compaction process are studied by analyzing the time-frequency domain plot of the vibrating wheel，Poincaré Map，Largest Lyapunov Exponent，and the dynamic contact force of the wheel-soil. The numerical simulation results show that with an increase of subgrade compaction，the motion of the vibrating wheel evolves from a single cycle to a multi-cycle motion，and finally enters a chaotic state. In the process of evolution，the vibration wheel acceleration frequency domain characteristics from the initial single fundamental frequency to the fundamental frequency accompanied by an integral frequency harmonic transition. In the end，the fundamental frequency and 1/2 times the subharmonic are the main parts. After entering the chaotic state，reducing the excitation force and increasing the excitation frequency can make the chaotic state degenerate to approximately a single cycle motion. Among them，the response characteristics of reducing the excitation force are weak 1/3×，2/3× and high harmonics in the frequency domain response. Among the response characteristics of increasing the excitation frequency，the single cycle of the compaction movement of the vibrating wheel is more obvious.

A theoretical model for statics and dynamics of bistable asymmetric cross-ply composite laminated square plates is established. Three equilibrium states are determined by curing analysis in statics. Meanwhile the super-critical pitchfork bifurcation with temperature difference as the control parameter is explicated in the process of curing. Two stable states and one unstable state are demonstrated by stability analysis. The potential energy curve with two potential wells is depicted，which can contribute to studying dynamic snap-through. Moreover，the dynamic bifurcation for the equilibrium points is induced by introducing damping in dynamics. The influence of the base excitation frequency on the dynamics is discussed by numerical simulation. When the excitation frequency is located in a certain range，the large-amplitude dynamic snap-through and nonlinear vibrations with two potential wells can occur. The dynamics behaviors of the bistable system are overwhelmingly dominated by periodic vibration，quasi-periodic vibration and chaotic vibration. The certain frequency range，where the large-amplitude dynamic snap-through and nonlinear vibrations with two potential wells can occur，can be defined as a certain frequency broadband which proofs bistable asymmetric cross-ply composite laminated square plates to be applicable to bistable energy harvesters.

The existing rectangular piezoelectric cantilever beam has the shortcomings of high intrinsic frequency and low output performance. In this paper，a piezoelectric energy harvester based on the enhanced negative Poisson’s ratio structure is designed by combining a negative Poisson’s ratio structure and X-shaped ribs in an elastic substrate. The dynamics model of the energy harvester is established by using the finite element method for the piezoelectric coupling analysis and parametric analysis. The prototypes are fabricated to verify the design. The results show that the energy harvester based on enhanced negative Poisson’s ratio structure has a low first-order resonant frequency，high output voltage and power，and the addition of X-rib increases the stiffness and nonlinearity of the structure. Compared with the conventional negative Poisson’s ratio structure，the introduction of X-rib not only improves the fatigue performance of the structure，but also broadens the bandwidth by 67.87%. The energy harvester based on enhanced negative Poisson’s ratio structure is important for solving the power supply problem of wireless sensors and portable electronic mobile devices in the future.

Vibration energy harvesting technology is expected to solve the problem of self-powered wireless sensor nodes. By introducing nonlinear magnetic force，a magnetic coupling array piezoelectric energy harvester （MA-PEH） is designed in this paper. The nonlinear magnetic force model is established based on magnetic dipole method. The restoring force model of composite beam is obtained by finite element method. According to Newton’s second law and Kirchhoff’s law，the dynamic model of the system is established. The influence of excitation amplitude and excitation frequency on dynamic response is analyzed by simulation and verified by experiment. The results show that under the action of nonlinear magnetic force，the system appears chaos and periodic motion between wells near the resonant frequency，which can help to broaden the working frequency band of the energy harvester. As the excitation frequency changes，each composite beam always maintains the same motion state. When the system is in a periodic motion state between wells，only one type of beam is in a high-energy output state. When the excitation frequency is near the resonant frequency of the two beams，increasing the excitation amplitude will lead to the boosting of the output of one type of beam，while the output of the other type of beam will be suppressed. The research provides theoretical guidance for the design of array piezoelectric energy harvesters and new research ideas for improving the output performance of piezoelectric energy harvesters.

Structural response of quay crane should be paid more attention to with the growth of worldwide logistics demand. This paper analyzes the response mechanism of the metallic structure of the quay crane induced by trolley traveling. On-site test is conducted. The time domain of crane girder acceleration signal shows that the main influence of the trolley travelling on crane structure is the high-frequency impact as it passes through the hinge point. The spectrum shows the main frequency of structure vertical vibration and impact vibration. Based on Euler-Bernoulli beam theory，a numerical model of quay crane single beam structure is established. The influence of different working conditions on the dynamic response of the beam structure and effect of the centrifugal acceleration term in the dynamic equation on logistics equipment such as quay cranes is analyzed. A refined model of the whole structure including the critical parts of the structure，such as the hinge points，the rail girder and other structural geometric features is established. The trolley is simulated with simplified mass points，and the interaction between the trolley and the girder is realized by the contact between the mass and the shell elements in the dynamic analysis of the quay crane structure. The eccentric force of the rail girder is considered，and the acceleration response of the girder hinge point is calculated，which is basically consistent with the measured signal results. After calculation and analysis，the frequency spectrum of the measured acceleration signal and the calculated signal spectrum at the girder hinge point of the quay crane show that the main influence of the trolley traveling on the quay crane structure is the high-frequency impact. The influence of the impact on the surrounding structure cannot be ignored. At the same time，the displacement results of 10 measuring points on the girder of the quay crane model and the trolley show that when the trolley runs at a constant rated speed with the rated load，the front end of the girder of the quay crane produces a vertical quasi-static displacement. The displacement spectrum indicates that the trolley is mainly affected by the vertical direction forced vibration.

An underwater acoustic structure with metal perforated plate inserted into the traditional anechoic coating is proposed to improve the pressure resistance and sound absorption performance of the structure. The deformation of the acoustic structure under different hydrostatic pressure is studied by the static method. By establishing the acoustic finite element equation under the action of hydrostatic pressure，the sound absorption effect of the acoustic structure under different hydrostatic pressure is analyzed. Compared with the traditional anechoic coating，under the hydrostatic pressure of 0 to 6 MPa，the acoustic structure achieves better broadband sound absorption in the mid-to-high frequency range. In addition，the effects of the thickness，material and porosity of the metal perforated plate on the sound absorption performance of the acoustic structure are discussed. The research shows that the underwater anechoic coating with metal perforated plate is an effective design to improve the pressure resistance and sound absorption performance of underwater acoustic structure.

To investigate the vibration and acoustic properties of the baffled functional gradient plates with general boundary conditions under turbulent excitation，a vibro-acoustic coupling model of the functional gradient plate under turbulent boundary layer wall pressure fluctuation is developed by the energy method based on the turbulent pressure fluctuation cross-spectral density，Chebyshev spectral method，Rayleigh integral and the continuity condition of the fluid-structure coupling surface. The accuracy of the algorithm is verified by the agreement with the analytical solution and experimental results. The effects of the general boundary condition and the gradient index of the FGM plate are studied. It can be noted that when the stiffness of the boundary spring is in a certain range，the peak frequencies of the flow-induced acceleration level and sound pressure level increase with the rise of the spring stiffness. When the stiffness of the boundary spring is large，low vibration and radiated sound exist at low frequency，while the radiated sound pressure is high at high frequency. As the gradient index increases，the peak frequency increases gradually，but the peak responses of the acceleration level and sound pressure level decrease.

A damage identification method of laminated rubber bearing based on its natural frequency is proposed in this paper. Through the periodic structural characteristics of laminated rubber bearings and the characteristic waveguide nano method of the periodic structure，the relationship between the natural frequency and the change of overall shear modulus of the basic periodic unit is deduced，and the sensitivity identification equations of the rate of natural frequency change to unit damage is established. The identification equation set is solved by the constrained optimization method. The damage identification of the laminated rubber isolation bearing based on the change of natural frequency is therefore realized. The example of the calculation model considers the influence of the upper structure on the rubber bearing at the bottom layer，which makes the calculation model more in line with practical engineering. The effectiveness and accuracy of the damage identification method proposed in this paper is verified by the three-dimensional finite element numerical siulation analysis.

Self-centering brace has greater stiffness and bearing capacity after being activated. The brace connection，beam and column are subjected to more complex forces and higher risk of damage. A novel frictional prefabricated connection node in self-centering braced steel frame is proposed to control ultimate axial force of the self-centering brace by frictional slipping. It provides additional energy dissipation for the whole structure. Configuration，assembly and working principles of the connection nodes are described. By numerical simulation，its seismic performance is studied. The effects of design parameters of the connection node on performance are analyzed. The results show that the hysteretic response of the self-centering braced steel frame with the novel connection node is fuller. The energy dissipation capacity of the overall structure is increased by 20.81%. The actual limiting effect of the connection node on total shear force reaches 17.56%，effectively regarding the plastic development of connection node region. By changing the friction coefficient of the friction plate and the preload force of the high-strength bolts of the connection node，the slipping displacement and force can be adjusted.

To solve the problem of friction pendulum system without pull-out resistance under external load excitation，based on electromagnetic principles and semi-active control ideas，an electromagnetic chuck friction pendulum composite isolation system （ECFPS） based on electromagnetic force combined with traditional friction pendulum is proposed. The structural characteristics and energy dissipation mechanism of the composite isolation system are introduced，and theoretical formulas for electromagnetic suction force，equivalent stiffness，period，and equivalent damping ratio of ECFPS are derived based on electromagnetic principles. The ECFPS model is established. A 1∶3 scaled ECFPS specimen is designed and fabricated to investigate the hysteresis performance under different input currents，vertical loads，and displacement amplitudes. The effects of different currents on the anti uplift performance are investigated. The experimental results show that the theoretical values are in good agreement with the experimental values，which verifies the correctness of the theoretical formula derivation. The changes in equivalent stiffness and unit cycle energy consumption are significant，with the maximum variation amplitude of 19.81% and 28.16%，respectively. As the current of the electromagnetic suction cup increases，the anti pull performance of the ECFPS system improves，achieving the vertical resisting pull function of the system.

Seismic vulnerability analysis is one of the most effective tools to evaluate seismic performance of pile-supported wharf （PSW） structures，which can quantify the probability of structural damage under given ground motion parameters. For a typical PSW in this study，the degradation of steel and concrete materials caused by chloride ion induced erosion is explored. Based on the open-source numerical computational platform OpenSees，a two-dimensional finite element model of PSW is created. In this model，the cross-section characteristics of pile considering corrosion effect are adopted in splash zone. The influence of chloride ion induced corrosion on seismic performance of PSW structure is discussed. Pushover analysis method is used to determine the seismic demand bound limit of each damage state of PSW. By inputting 80 ground motions to wharf models with different corrosion years，the logarithm regression analysis for the ratios of the capacity and demand are adopted to develop the time-dependent seismic fragility curves. The results show that： Chloride ion induced corrosion leads to the decrease of deck displacement and pile top bending moment，and the slight increase of pile top curvature； During the whole service life of PSW，seismic vulnerability of wharf structure in different damage states increases with an increase of service time.