نتایج جستجو برای: stiffness deterioration
تعداد نتایج: 75555 فیلتر نتایج به سال:
To date, the spring stiffness of resilience pads was mostly evaluated based on conventional (site measurement and laboratory tests) methods. Most studies in past analyzed effects deterioration track damage. examine pads, evaluations were conducted tests using site measurements samples collected from site, or loading special equipment. such as TSS. However, no methodology proposed to prove theor...
To investigate the shear capacity and failure mechanism of RC beams after fire exposure, fourteen full-scale without stirrups were tested at ambient temperature exposure. Three parameters, including loading ratio, span-to-depth ratio longitudinal reinforcement considered in static load tests. The deterioration bearing diagonal section exposure was experimentally, numerically theoretically revea...
In order to investigate the stress characteristics of ballastless track under high latitude, and multi-source multi-field extreme temperature conditions. Based on finite element theory elastic foundation beam–plate principle, a model considering limit convex abutment, gel resin, interlayer bonding is established. The mechanical slab–CAM layer state, mortar separation, freeze–thaw degradation fo...
Cold-formed steel (CFS) shear walls with concrete-filled rectangular steel tube (CFRST) columns as end studs can upgrade the performance of mid-rise CFS structures, such as the vertical bearing capacity, anti-overturning ability, shear strength, and fire resistance properties, thereby enhancing the safety of structures. A theoretical hysteretic model is established according to a previous exper...
This paper aims to provide an experimental support on seismic performance evaluation of the steel braced truss-RC (reinforced concrete) column hybrid structure, which could be applied as the air-cooled supporting structural system in large-capacity thermal power plants located in strong earthquake prone regions. A series of pseudo-dynamic tests (PDTs) and quasi-static tests (QSTs) were performe...
The effect of unilateral hindlimb immobilization and subsequent free remobilization on mechanical properties of femur was examined in young adult rats. Right hindlimb of 17 weeks old male rats was immobilized for 2 weeks. Rats were sacrificed either directly after immobilization (E0) or after 4 weeks of free remobilization (E4). Mechanical properties in three-point bending as well as dry mass (...
Focusing on soil liquefaction, the seismic records during the Niigata-ken earthquake in 1964, the southern Hyogo prefecture earthquake in 1995 and the 2011 off the Pacific coast of Tohoku earthquake are analyzed by the non-stationary Fourier spectra. The shift of dominant frequency in the seismic record of Kawagishi-cho during the Niigata-ken earthquake is evaluated based on the time-variant pr...
BACKGROUND Endovascular aortic repair (EVAR) is performed in patients with thoracic or abdominal aortic aneurysm because it is less invasive than conventional open repair. However, the effects of EVAR on vascular and cardiac function remain to be clarified. METHODS AND RESULTS We studied the effects of EVAR on several outcome variables in 40 consecutive patients undergoing EVAR for abdominal ...
This paper focuses on understanding and assessing the effect of hysteretic behavior (i.e., bilinear, peakoriented and pinching) in the evaluation of peak deformation demands and their distribution over the height for regular frame structures over a wide range of stories (from 3 to 18) and fundamental periods (from 0.3 s. to 3.6 s.). The ground motions used are those with frequency content chara...
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