钢框架梁柱腹板刚性连接抗震性能分析-结构工程专业论文.docxVIP

Subject：The Subject：The Analysis of Seismic—Resistant Behavior of Beam．to，Column Web Rigid Connections in Steel Moment Frames Specialty： Structural Engineering Name ：Li Yangcheng (Signature) Instructor：Guo Bingshan(Signature) ABSTRACT Steel moment—resisting flames，which were considered having excellent performance for seismic resistance，were widely used in multi·stories or high—rise structures．But previous investigations of earthquake disaster indicated that many destroies occured in the steel frames to various extent，and mostly belonged to brittle fracture of beam-to·column connections，which indicated that cognitions on the damage mechanism of welded—bolted beam-to-column joints were rather inadequate．In fact，beam·to—column web connections are as widespread as flange connections in the steel frames，and the design and construction of them are more difficult． Studies on seismic-resistant behavior of beam—to··column web connections are not only significant from the theoretical aspect，but also important in practice． Based on the verifications of the existing test results by the computation results from the nonlinear finite element program considering geometry,material and status nonlinearity,an thorough finite element simulation of the welded—bolted beam—to—column web connections is carried out．The behavior and fracture mechanism of web connections under cyclic load are analysed，then a new distribution mode of shearing strength in the joint zone is put forward based on the computation results，which can provide basis for engineering design．During the parametric analysis，length ofbeam flange continuity plate sticking out column flange，height of beam，axial pressure ofcolunm，thickness ofbeam flange，thickness and width ofcolumn flange are considered to study their impact on the seismic·resistant behavior of the web connections． Subsequently,the influencing degree of these parameters is studied using orthogonal design and an reasonable scheme making the connections have