Discontinuous perfobond rib shear (PBL) connectors can be applied to fabricated steel-concrete composite beams. In this paper, six push-out specimens were designed explore the performance of PBL under static and repeated loads. Four used for test. The remaining two fatigue load test mainly considers influence concrete at steel plate end post-cast strip on bearing capacity, initial stiffness load-slip curve discontinuous connectors. On basis results, calculating formulas capacity considering...

Voids inside reinforced concrete, which affect structural safety, are identified from ground penetrating radar (GPR) images using a completely automatic method based on the support vector machine (SVM) algorithm. The entire process can be characterized into four steps: (1) original SVM model is built by training synthetic GPR data generated finite difference time domain simulation and after preprocessing, segmentation feature extraction. (2) classification accuracy of different kernel...

Adjacent tunnel construction and environmental disturbances can lead to longitudinal deformation in pipe-jacking tunnels. The of the is closely related occurrence joint dislocation, opening, other defects. In view difficulty obtaining 3D curves, a method proposed obtain curves based on large number point cloud data with high spatial resolution dimensions. Combined mechanism defects occurrence, theoretical basis for assessment proposed. Taking one pipe jacking as an example, settlement curve...

The maintenance of in-service shield tunnel lining has become a critical issue in recent decades due to the rapid development metro system China. external load is one most important factors influencing deformation and performance tunnels. It hard evaluate since it influenced by complex factors. And arbitrary-distributed not considered existing theories. A novel back-analysis approach for evaluating using was proposed based on Betti’s theorem. theoretical rationality method analyzed, workflow...

Security issues of text watermarking are greatly different from those other multimedia watermarking, in terms its specific requirements and characteristics watermarking. The security theory is proposed this paper, the following topics discussed: (i) classification application watermarking; (ii) analysis attacks; (iii) model countermeasures. Other open further challenges related to also addressed.

Modal parameters are of great significance in civil engineering because they can characterize the properties structures and be used for vibration control structural health monitoring. Subway tunnels long linear truss combined with mutual coupling surrounding soil. Therefore, operational modal analysis a tunnel is complicate, as identification shield time–frequency domain, these hot topics. Using Shanghai metro line No.12 project case study, we carried out response monitoring subway during...

Abstract Dou-gong is important component of ancient timber buildings in China, Japan, and South Korea, etc. It has decoration load transferring functions. Due to its complex structure, difficult be fully analyzed large-scale structured. Therefore, it necessary establish a reliable simplified calculation model. In this study, some traditional Chinese built the Song Yuan dynasties (960–1368 AD) are investigated, characteristics typical model obtained. Experimental study refined finite-element...

In this paper, the dynamic response of underground rectangular fluid tank resting on an elastic foundation and subjected to arbitrary loads is developed in form analytical solution. The responses investigated are deflection, bending moment, shear force tank. assumed be a frame composed horizontal vertical beams foundation. mechanical resistance modeled using spring elements that account for soil due compressive strains soil. as inviscid irrotational, influence free-surface wave ignored. An...

In this work, the pyrolysis and piloted ignition behavior of thermally thick paulownia wood brick for different orientations has been experimentally investigated, by using conical heater. Three typical were adopted, that is, upward, downward, vertical cases with incident heat flux ranging from 12 to 39 kW/m 2 . A numerical approach was used test effect convection radiation blockage on pyrolysis. The time observed be strongly dependent orientation. detail, shortest turns downward orientation,...

Hypergraph offers a framework to depict the multilateral relationships in real-world complex data. Predicting higher-order relationships, i.e hyperedge, becomes fundamental problem for full understanding of complicated interactions. The development graph neural network (GNN) has greatly advanced analysis ordinary graphs with pair-wise relations. However, these methods could not be easily extended case hypergraph. In this paper, we generalize challenges GNN representing data principle, which...

An analytical solution is derived for dynamic response of a modified Timoshenko beam with an infinite length resting on visco-Pasternak foundation subjected to arbitrary excitations. The model employed further consider the rotary inertia caused by shear deformation beam, which usually neglected traditional model. By using Fourier and Laplace transforms, governing equations motion are transformed from partial differential forms into algebraic in domain. then converted time domain applying...

The Great Wall is one of the most famous cultural heritages in world. defensive forts constitute important parts Wall. However, many them have been severely damaged through centuries, and their status requires a scientific evaluation. Taking part Yanqing district with 101 as an example, on-site investigations were carried out main architectural forms, well damage characteristics, detected. Based on form analysis, hierarchical quantitative evaluation system structural safety for hollow was...

Train‐induced vibration is increasingly attracting people’s concern nowadays. In the coastal areas, many metro tunnels are built in soft deposits, so train‐induced effect more serious. Nevertheless, existing research studies mainly focus on dynamic responses tunnel or ground surface while characteristics seldom studied. this paper, a comprehensive field measurement was performed by installing accelerometers and soil layers to capture response of track‐tunnel‐ground system. Elastoplastic...

To validate the feasibility of classical fire scaling laws under low pressure, three typical liquid fuels with different sooting levels, i. e. ethanol, n-heptane and jet-A, were employed in this paper to perform a sequence pool fires high altitude city, Lhasa, Tibet, China (3650 m, 64.3 kPa). Mass loss, axial temperature profile radiative heat flux recorded each test. From assessment experimental data, it can be concluded that dimensionless burning intensity m?? /D correlated against Grashof...