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The results showed that, all the 4 widened beam flange joints of the column reached the request of seismic moment-resisting of the steel frame connection, while the brittle fracture of the weld root of the ordinary specimen limited the plastic properties of beam-column joint.
In the simulation process, because the affection of the welding residual stress on the point’s final failure pattern and mechanical properties were little [4], in order to highlight the inflection of the structure of widened joints on performance of joints, the weld defects and welding residual stress effect of the joints were ignored in the analysis.
The main reasons were that the ordinary joint failure occurred in the weld section of the beam and column flange connection so that the affection of the weld construction quality, weld defect and welding residual stress and other factors were relatively big, which caused the deviation from the test values.
The parent material of the flange there was located in the heat affected zone and the performance of the material was reduced, so as to tear along the direction of the flange section in the width
(4)With respect to ordinary points, in the process of loading, the maximum Mises stress was always on the weld area of the beam column, so, plus the inevitable unfavorable factors of welding quality defects etc. brittle failure of the weld seam near the end of the column easily happened

On the other hand, the change of the support condition (i.e. the aging of the supporting structure and structural sealants or loosening of the adapting pieces) strongly affects the reliability, capacity of resistance to wind load and earthquake function, airproof and waterproof properties of the glass curtain wall.
It can be seen that the dynamic properties of the glass specimen changes after the bolts is slacked, it is obvious that the natural frequencies decrease as the bolts is slacked.
The exposed frame supported curtain wall glass in mechanical analysis is usually treated as a rectangle plate fixed by elastic clamp at four edges [8-10], the structural stiffness of an elastic clamped rectangle glass should be between the simply supported plate and the clamped rectangle plate.
In fact, the expected natural frequency and stiffness for a curtain wall glass depend on many factors, determining the expected natural frequency of the curtain wall glass and their variation with time are important for estimating the reliability of glass curtains or window glasses.
As an example, in the experimentation above, the mechanical parameters of the glass specimen are: E = 72 GPa, = 0.22, m = 10kg/m2, and the lower limits natural frequency of the glass specimen can be determined by Eq.(1): =1375.3(rad/s) (Hz) The value of 219Hz is the evaluating criterion for risk analysis of this glass, from Fig.4 it can be seen that the corresponding clamping force is 0.53, in other words, when the bolts are slacked 47%, the glass may carry a fall off risk.

Many researchers [2-4] have related the formation of secondary phases with the final mechanical properties for Al containing Mg alloys.
The extent of microsegregration directly affects the mechanical properties of the final products and requires post solidification processes like annealing and homogenization before the alloys can be put to commercial application.
Microsegregation Model The model accounts for the important kinetic factors such as solute (Al) back diffusion in Mg (hcp) phase, secondary dendrite arm coarsening, dendrite tip undercooling and eutectic undercooling.

Another widely used mode updating methods are sensentivity-based approaches, seeking to find correction factors for each individual finite element or for each design parameter relating to each finite element.
The sensitivity-based approach has an advantage of identifying parameters that can directly affect the dynamic characteristics of the structure.
Because the difference between measured and analytically predicted modal properties is utilized in a sensitivity-based approach, measured and predicted modes must be pairing and scaling correctly [8].
Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review, Los Alamos National Laboratory Rep.
B., A summary review of damage identification methods that examine changes in dynamic properties, Shock and Vibration Digest, 30 (1998), 91-105

The structural change of loess is mainly affected by water ratio.
According to Code for Measurement Method of Dynamic Properties of Subsoil (GB/T50269-97)[10], the equivalent damaging number of vibration replaces cycling times under real dynamic loading.
Quantitative analysis of stress relaxation phenomenon of Lishi loess were done by using factor of stress relaxation(I=(σmax-σmin)/σmax).Cycle loading experiments under different confining pressures and dynamic stresses were finished, and dynamic stress time history and value of stress relaxation factors are shown respectively in figure 1 and table 3.
Seismic damage assessment and seismic subsidence of loess with Different properties.
[10] GB/T50269-97, Code for Measurement Method of Dynamic Properties of Subsoil[S].in Chinese

Table 1 presents the mechanical properties of Inconel 718.
Mechanical properties of Inconel 718.
Modulus of elasticity (GPa) Density (kg/m3) Poisson ratio 212.93 8190 0.284 Since piezoelectric properties are not directly compatible with ANSYS®, the necessary conversions must be applied [22].
Material properties of PIC255 [23].
The adhesive layer is known to affect EMI results.

Soil aggregates have certain mechanical resilience, water stability and biological stability.
The quantity and stability of soil aggregates was affected by environmental change and production activities[2,3].
Soil erodibility was determined by the joint action of various soil properties[5], in which soil structure was considered to be the most important and direct property [6].
Orchard soils have the same properties with the soils of food crops.
Table 1 Composition of aggregates in orchard soils (dry-sieving method) The formation and change process of the aggregates is the consequence of various complex factors.

Fiber reinforced plastics, due to their good mechanical properties and simultaneously low density, are very attractive for many uses.
The low density of the materials and the tailored mechanical properties by fiber orientation allows weight savings up to 60% compared with steel and 25% compared with aluminium.
In particular the high energy involved in the production of components as well as the FRPs affects the eco-balance negatively.
Few research projects in the area of the Pultrusion of natural fibre-reinforced plastics use on the one hand often a petrochemical matrix or only partially bio-based matrix and on the other hand the products mostly have a bad fiber-matrix adhesion with unsatisfying mechanical properties.
· Consistent strength: Regenerated fibers possess a consistent strength without quality variations, so that the component weight and the safety factor can be reduced

The ageing conditions and therefore the mechanical properties of the components can be predicted more accurately by the simultaneous combination of hardness and conductivity values.
For example, the quench factor analysis model has been applied successfully to the prediction of post-quench physical properties in aged Al alloys [1].
Rosen et al [3] used electrical conductivity to study the changes in the mechanical properties during the age hardening process in AA 2024 and evaluated quantitatively the extent of removal of the minor constituents Cu and Mg from the solid solution.
Brasche et al [5] and Koch and Kolijn [6] also studied the properties, such as strength, fracture toughness and stress corrosion cracking, non-destructively.
Aluminium: Properties and Physical Metallurgy, 1st ed.

It has been well recognized that the physical and mechanical properties are strongly affected by atomic defects such as vacancies and antisite atoms.
Major topics on the mechanical properties of B2 FeAl alloys are a drastic change in microhardness with the vacancy concentration [1] and an anomalous increase in yield stress with rising temperature [2].
Internal friction technique is one of the best ways to reveal the defect properties.
In addition to the temperature dependence of internal friction, the study of the amplitude-dependent internal friction is the most promising way to investigate the mechanical properties in the microplastic range [11].
George, Thermal vacancies and high-temperature mechanical properties of FeAl, Phys.