natural period造句

• Natural period of soil site
  动力机器基础地基固有周期
• The stiffness of the former is less than the latter , and the natural periods of the former is longer than the latter
  前者模型的刚度较后者柔，其周期较后者长。且楼板模型的选取对结构的扭转影响较大。
• The modification coefficient of the natural period will directly effect the reaction of the reinforced concrete frames under the earthquake , so
  周期修正系数的取值将直接影响地震作用下钢筋混凝土框架的反应。
• ( 3 ) furthermore , the stiffness effect induced by the infill walls makes the natural period of the frames decrease , which makes the earthquake forces put on the structures increase
  3 .另外,填充墙刚度效应的存在使得结构自振周期减小,从而使作用于整个建筑上的水平地震作用增大。
• I turns out to be that the position and degree of damage can not be well detected only by eigenfrequency , while only can detect if the damage has appeared . however , severe damage can be diagnosed if the modal shape and natural period are used
  利用以上指标对试验构件的损伤进行识别与定位,研究结果表明,仅凭获取的固有频率不能准确判断结构构件的损伤状态及损伤位置,只能初步判断结构中是否出现损伤。
• When the axial loads on piles are not considered , contrast with the considered one , the first and the second natural periods are mainly effected , from which conclusions can be drawn that the axial loads affection is obvious to the construction system considering relaigh damp
  通过计算分析发现，考虑轴力的桩基础阻抗主要影响前两个周期，当采用relaigh阻尼的结构体系计算时考虑桩基础轴力明显影响交错析架体系的动力特性。
• 5 ) the method to calculate the natural periods of staggered truss with sshsti with raft - pile foundation is decided , and the natural periods of staggered truss with column foot fixed and sshsti with raft - pile foundation are calculated and investigated
  5 )明确了计算地基及桩筏基础共同作用时固有周期的计算方法，计高层钢结构交错析架体系一与地基基础共同作用研究算研究了交错析架体系柱脚固定时和地基及桩筏基础共同作用时体系的各个固有周期。
• By calculating large quantity of examples , this text studies earthquake resistant behavior of tapered portal frame with pined bases and analyzes its natural frequency , natural period of vibration and vibration mode . by comparing interior forces of pillar top , beam end and span midpoint in two conditions that seismic action effect participates combination of forces and not when portal frame is n ' t changed , ensure conditions that combination of seismic action effect has controlling f unction during tapered portal frame design , and tapered portal frame demands anti - earthquake design
  本文通过大量算例分析，研究柱脚铰接楔形变截面门式刚架的抗震性能，并对其自振频率、振型进行了分析；通过比较地震作用效应参与荷载组合与不参与荷载组合两种情况下，梁柱截面尺寸不变时，柱上端、梁端、跨中截面处的内力大小，确定在什么情况下地震作用效应组合起控制作用，变截面门式刚架需要进行抗震设计。
• To reproduce the narrow - band response , based on the thought of kanamori etc . , the damping ratio and natural period are modified . through this adjustment , the narrow - band response can be reproduced , but for some natural periods the adjustive damping ratio has become negative . the negative damping is strange and can not be explained by the equation of motion for sdof system
  为了生成窄频带反应，本文根据kanamori等人的方法调整了计算时的阻尼比及自振周期，调整后的单边差分方法能在共振区域生成很好的窄频带反应，但是对一些周期点的阻尼比调整成为了负值，这从系统的动力平衡方程是难以解释的。
• Thirdly , subspace iterative method is adopted in the paper , and natural periods and modes of preceding fifteen steps of zhongshan no . one bridge are solved , dynamic characteristics of this kind of structural system are obtained , inherent link between dynamic characteristics and structural rigidity is discussed deep , the viewpoint is provided that dynamic characteristics of a structure are considered as important basis whether structural scheme is rational ; in addition , the author brings out some own views and opinions about calculational methods of prestress value of different sorts of tie rods , simulation of local rigidity region , foundation of a local finite element model of a node
  另外，提出在施工阶段中某些构件的应力有可能比成桥状态的应力还大，需防止在施工状态中构件因强度不足而破坏；再次，采用于空间迭代法，求解了拱式组合体系桥梁的自振周期和振型，得出该种结构体系的动力特性，深入探讨了动力特性和结构刚度之间的内在联系，提出了把结构的动力特性作为判断结构方案是否合理的重要依据。此外，本文还就系杆预应力值的确定方法、局部刚度区域的模拟、节点局部有限元分析提出了作者的见解和看法，对解决类似问题得出了一些有参考意义的结论。
• Based on extensive investigation of construction technique history of chinese ancient buildings , the structure method , structure developing history and seismic behavior of chinese ancient timber structure buildings are analyzed in several respects of the structural system and form . through a series of experiments on constituent parts of chinese ancient timber building structure , including the tests on the corbels and brackets called dougong subjected to low cyclic reversed loadings , the tests on the wooden frame using the tenon - mortise joints as connections of column and beam subjected to low cyclic reversed loadings , the tests on vibration isolation effect of friction and slippage between column footing and their socle base , and a series of shaking table tests on a chinese ancient timber structure palace building mode under artificial earthquake at serving conditions , destroyed conditions and reinforced conditions , many valuable results of structures such as moment - curvature hysteretic loops of dougong structure and tenon - mortise joints under low cyckc reversed loadings , the static function , the seismic performance , energy dissipation , vibration reduction , energy - loss mechanism , nechanicalmode and failure mode were studied . aplenty of valuable parameters of the structure system were obtained , such as the natural period of structure , vibration modes , damping ratio , factor of vibration isolation , oscillate amplitude of ineitial accebration , velocity and displacement , magnitude of slippage , and the mechanism of structure failure and collapse etc . based on these research , the complete analysis of ancient timber structure under earthquake were carried out in which including mechanism analysis method , calculating mode , strength analysis of members and joints , strengthening methods for serving damaged ancient timber structure buildings were also taken into account
  依照宋代《营造法式》建造了抬梁式殿堂木结构构件及结构模型，对中国古代木结构中的典型构造如：柱脚在础石顶面平搁简支、柱架榫卯连接、柱高不越间之广、侧脚、生起、斗拱等的构造机理及结构功能进行了量化分析和实验研究： (一)通过木柱石础静摩擦试验，测定了柱脚与石础古镜面间的摩擦系数及摩擦力随上部结构荷载变化的规律； (二)通过单柱承载力试验，测定了古建筑中木柱的受力变形特征、破坏模式、及模型材料的变形模量、极限承载力、极限变形等参量； (三)通过柱架低周反复荷载试验，测定了柱架的抗侧移刚度、柱架恢复力特性及滞回曲线、榫卯张角刚度及其变化规律、柱架及榫卯的极限承载力和极限变形、及榫卯减振参数； (四)通过斗?低周反复荷载试验和受压试验，测定了古建筑木构件与木构件间摩擦系数，斗?抗侧移刚度，斗?恢复力特性及滞回曲线，斗?抗压极限承载力及受力变形规律； (五)通过抬梁式殿堂间架模型振动台试验，测定了殿堂木构架结构自振周期，地震反应振形、阻尼特性及阻尼比；按结构分层特点对柱脚、柱头和斗?层上的屋盖的地震反应采用多点同步测量，对柱根滑移、榫卯变形、斗?的变形、复位、耗能减振参数等进行了定量分析。
• The natural periods of formal six modes were advanced researched , the floor panel is assumed to be elastic , contrast with the results , first time it ' s found that the third natural period has a small affection considering sshsti . when the axial loads on piles are considered , the other periods in the formal six modes have relative percent variation from 30 % to 60 % , and the relative percent changes small considering different ground
  对比分析发现，体系前六阶振型中，考虑楼板弹性假定的地基基础与结构共同作用对第三振型固有周期基本不存在影响，当地基中的群桩考虑轴力时，其它固有周期增大在30 %至60 %之间，且不同地基之间的差异变化较小。