structural crossing meaning in English

结构跨越

Under the condition of unchanged topology configuration of the truss , the extremum existence of the natural frequency is demonstrated . it will orientate the optimization of structural cross - sections and the topology optimum with frequency constraints toward a further search measure . 4
证明了在保持结构拓扑基本不变的情况下，桁架结构优化频率的极值存在，为具有频率约束的结构的横截面积优化以及进一步的拓扑优化提供了优化指向； 4
The results show that the difference of the properties between the two tv towers is great , and the influences of the structural high order modes as well as the structural cross spectral density on the internal force are obviously , so that this effects on structural internal force must be taken into account comprehensively in the aseismic design of tall tv tower
结果表明，洛阳电视塔与东方明珠电视塔的内力演变谱密度特性具有很大的差别，结构的高阶振型及结构的互谱密度对结构的内力具有较大的影响，因此结构的抗震设计应综合考虑这些因素对结构内力的影响效应。