本文把带肋扁壳的肋看作为一层网壳，且连续化为下层壳，并与带肋壳的壳板即上层壳组成协同工作的拟双层壳计算模型，进而可按弹性小挠度薄壳理论分析计算带肋扁壳。文中推导建立了一般情况下带肋扁壳混合法的基本方程式。这种构造上的拟双层壳一般不存在中面，因而壳体的薄膜内力、弯矩与薄膜应变、弯曲应变是耦合的，序在一个耦合矩阵，它可充分反映肋与壳板偏心矩e的影响。对于两向正交正放与三向带肋扁亮文中作了详细的讨论。并说明了在一定条件下，基本方程式可简化为一个构造上正交异性甚至各向同性单层扁壳的基本方程式，以方便计算和工程应用。文中附有算例两则。

对大跨度桥梁、大跨空间结构、高层建筑、高耸塔桅结构等建筑物和构筑物而言，风荷载是结构抗风设计、防灾减灾分析的控制荷载之一。风与上述结构间的相互作用十分复杂，可通过风洞试验、现场实测、数值模拟等方法获取详细可靠的风荷载数据。本文简要介绍了大气边界层风特性与风荷载作用特点，回顾了结构风工程中风洞试验与现场实测的基本情况，讨论了风荷载时程的各种数值模拟技术，展望了风荷载测试与模拟技术研究的趋向。

针对斜拉网格结构体系的弹塑性动力响应问题，阐明斜拉索非线性特性，建立索塔塔柱刚度矩阵，研究空间杆单元恢复力模型及其弹塑性状态转换判定方法，给出临界点处的处理方法和结构弹塑性动力响应的计算策略。数值分析该类结构动力特性及线性和弹塑性振动问题。结果显示，斜拉索的存在提高了结构刚度，可显著改变结构振动特性，竖向地震响应，明显大于水平向地震响应弹塑性位移、内力均大于弹性计算结果。

Based on finite element method and finite strip method, a simplified approach was presented to analyze high-rise frame tubest ructures. The generalized st ripelement is introduced and then the generalized stiffnessma-trices for beamand column-line are derived by using the displacement funct ions that describe the nodal displace-ments and disp lacement transforms. Furthermore, the fo rmulas for the generalized stiffnessmatrix of generalized st rip element and load arrays co rresponding to the disp lacement parameterswere developed. It is shown through a series of numerical computat ion that the nodal angular displacements at the same floorin a generalized st ripele-ment are approximately identical. A comparison of the finite elementmethod and the finite stripmethod shows that the simplified approach no tonly is accurate, but also reduces the number of basic unknown quantities.

The multiple active lever-type tuned mass dampers (MALTTMD), consisting of many active lever-type tuned mass dampers (ALTTMDs), is proposed in this paper to gain a control system with high robustness and effectiveness, in which the static and dynamic stretching of the spring may be freely adjusted. The main objective of the present study is to evaluate the control performance of the MALTTMD (including the MALTTMD stroke). The evaluation of the MALTTMD is performed in terms of both minimizing the maximum dynamic magnification factors of the structure and the maximum dynamic magnification factor of every ALTTMD in the MALTTMD. The results indicate that the MALTTMD with the actuator set at the mass block can render better effectiveness and higher robustness compared to the MALTTMD with the actuator set at other locations and also has higher effectiveness than a single ALTTMD with equal total mass ratio and normalized acceleration feedback gain factor (NAFGF). More importantly, the static and dynamic stretching of the spring in the MALTTMD with the actuator set at the mass block may be freely adjusted in accordance with the practical requirements through changing the mass block location, while approximately maintaining the same control performance as the AMTMD. Additionally, a parametric study is carried out to examine the effect of the dominant ground frequency ratio (DGFR) on designing the MALTTMD.