Performance Degradation Alarming Method Based on Local Flexural Stiffness Identification for Beams

Uncertain local flexural stiffness is recognized as one of the main barriers against the application of existing damage detection and performance degradation alarming techniques to real-world beams.Therefore,damage localization of beams with original uncertainty has been investigated to ensure their safety.For the beam before serving,it should be simply supported and subject to static load.Based on the concept of suppositional partition,a new loading pattern and mid-span displacement data processing method has been proposed.Actual local flexural stiffness value of each partition can be obtained by solving a set of linear equations.The obtained stiffness data can be used to establish the finite element model of beams.Subsequently,dynamic excitation and mode identification should be carried out for the beam in service.Mode shape curvature index is employed to detect the position of damage.It was validated by example that actual damage and original uncertainty of local flexural stiffness can be differentiated by this new method effectively.The combination of static load and dynamic excitation can keep the serviceability of beam.     

FRP-混凝土复合桥面板弯曲性能有限元分析

提出了一种新型的FRP-混凝土复合桥面板.新型桥面板下部由3个GFRP箱型构件共同组成,并构成桥面板的受拉层,上部浇筑混凝土作为桥面板的受压层,这种形式的截面设计可以充分发挥两种不同材料各自的优势,并可大大增加GFRP材料构件的刚度.采用有限元技术研究了新型桥面板在荷载作用下的受弯性能,结果表明有限元分析是进行新型桥面板在荷载作用下弯曲性能研究的有效途径.     

FRP桥面板梁式桥动力性能的模拟分析

分别以FRP桥面板钢梁桥和FRP桥面板预应力混凝土梁桥作为研究对象,车辆模型选用空间振动模型,桥梁模型采用模态坐标法,通过轮轨接触处位移和力的协调条件建立方程,运用MATLAB的求解函数,计算车过桥的连续时间历程的车-桥耦合振动问题,并与相同条件下的混凝土桥面板梁桥的动力性能进行了对比,同时考察了路面粗糙度及车辆行驶速度对桥梁动力响应的影响.     

FRP桥面板钢梁桥车桥耦合振动分析

本文采用3-D全车模型和模态坐标法，以路面竖向不平顺为激励源，建立车-桥耦合振动微分方程，用Runge—Kutta法求解，据此思路用Matlab编制车-桥耦合振动的计算程序，并进行了FRP桥面板钢梁桥的振动分析，模拟结果与现场实测结果对比符合较好，表明该方法正确有效，可用于分析各种车桥耦合振动问题。     

新建本科院校实践教学改革方案初探

实践教学是大学本科教学的重要部分,对于大学生动手能力的培养、大学生综合素质的提高起着关键的作用。新建本科高校应进行实践教学改革方案的设计研究,通过科学设计实践教学体系、合理安排实践教学内容、规范考核评价等途径,全方位加强实践教学环节。