Multi-objective variance control of structural vibration

A procedure for the design of state feedback controller for seismic-excited structures is presented in this paper.The external exciting-controlled structure-control system was simulated using state space model.Based on the convex optimization technology and variance control theorem,the general expression of linear matrix inequalities (LMIs) for state feedback controller with closed-loop poles and the steady variance responses constrained were deduced,in which the poles and variance response of system were guaranteed to satisfy certain constraints assigned in advance.LMI Toolbox of MATALB was employed for optimizing the state feedback controller.At last,a three-story simple lumped mass shear model was used to demonstrate the effectiveness and superiority of the proposed method.

桩基支撑的塔式起重机在软粘土桩基中的地震响应分析（英文）

临时结构房屋的抗震性能次于永久结构房屋。桩基支撑的塔式起重机是一种临时结构,常被应用于建造高层建筑。安装在高处的塔式起重机,因其是高柔结构,在强地震动的作用下很可能会产生剧烈震荡。桩基结构的地震响应特性受周围的地基和基础类型的影响也较大。在当前日本的设计规范中,地震荷载仅仅被定义为20%的起重机结构重量,都没有充分考虑待结构的动态不稳定性和周围的地基类型。为探究塔式起重机在软粘土桩基中的抗震特性,开展了一系列的离心振动台试验。为起重机吊臂制定了2种不同的荷载条件来准确地模拟实际情况。根据测试结果,对塔式起重机的动力响应行为和影响的因素进行了讨论,得到如下结论:起重机臂架的荷载条件对桩的损伤程度有显著影响,并可以导致塔式起重机不同的破坏模式。