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首页> 外文会议>Structural Stability Research Council 2002 Annual Stability Conference; Apr 24-27, 2002; Seattle, Washington >SANDWICH PLATE SYSTEM RISERS FOR STADIA
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SANDWICH PLATE SYSTEM RISERS FOR STADIA

机译：三明治板系统的崛起

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In the static tests, the prototype displayed considerably more strength than required as exemplified by the linearly elastic behaviour to slightly above the factored load level. No buckling of the thin steel faceplates, which are supported laterally by the elastomer, occurred. There is reserve strength beyond this that could be considerable, but was not determined in the field tests where testing procedures were limited. Further inelastic finite element analyses are planned. The mid-span deflection at the full specified load level of 4.8 kPa or 100 psf was a meagre 1/700 of the span as compared with a deflection limit of 1/300 commonly specified for building floors. The observed dynamic performance was very good as compared to that expected of all-steel or pre-stressed concrete alternatives. The natural frequency of the risers with a. span of 40 feet on stiff supports, decreases with increasing load from a value of 6 Hz or more when unloaded to approximately 5 Hz at the likely live load of 1.7 kPa and just over 3 Hz at the full specified load level of 4.8 kPa. The damping ratio was established at about 2% of critical for the bare stands and about 14% when fully occupied. The damping ratio for the bare stands compares favourably with that of about 1% for steel or prestressed concrete structures of like span. The soft mass of spectators increases the damping ratio considerably.
机译：在静态测试中，原型显示出的强度大大超出了所需的强度，如线性弹性行为所示，该强度略高于分解的载荷水平。没有发生由弹性体侧向支撑的薄钢板面板的屈曲。超出此范围的储备力量可能相当可观，但在测试程序受到限制的现场测试中并未确定。计划进行进一步的非弹性有限元分析。在满载的指定负载水平4.8 kPa或100 psf时，跨度的中值偏斜为跨度的1/700，而建筑物地板的挠度极限通常为1/300。与预期的全钢或预应力混凝土替代品相比，其动态性能非常好。冒口的固有频率为a。刚性支撑件上40英尺的跨度随着载荷的增加而减小，从卸载时的6 Hz或更高的值减小到可能的1.7 kPa的活载时的大约5 Hz，而在4.8 kPa的整个规定载荷水平时刚超过3 Hz。裸机的阻尼比约为临界的2％，完全被占用时的阻尼比约为14％。裸机架的阻尼比与类似跨度的钢或预应力混凝土结构的阻尼比相比约为1％。旁观者的柔软感大大提高了阻尼比。

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