In the case of composite girders, an effective cooperation of both parts of the section is influenced by deformability of connectors. Limited flexural stiffness of welded studs, used commonly in bridge structures, doe...In the case of composite girders, an effective cooperation of both parts of the section is influenced by deformability of connectors. Limited flexural stiffness of welded studs, used commonly in bridge structures, does not provide full interaction of a steel beam and a concrete slab. This changes strain distribution in cross-sections of a composite girder and results in redistribution of internal forces in steel and concrete element. In the paper partial interaction index defined on the basis of a neutral axis position, which can be used for verification of steel-concrete interaction in real bridge structures rather than in specimens is proposed. The range of the index value changes, obtained during load testing of a typical steel-concrete composite beam bridge, is presented. The investigation was carried out on a motorway viaduct, consisting of two parallel structures. During the testing values of strains in girders under static and quasi-static loads were measured. The readings from the gauges were used to determine the index, characterizing composite action of the girders. Results of bridge testing under movable load, changing position along the bridge span is presented and obtained in-situ influence functions of strains and index values are commented in the paper.展开更多
目的探究团队为基础教学法(Team Based Learning,TBL)应用于医学类课程的实际效果及其影响因素。方法以本科阶段诊断学和系统整合临床课程的教学为例,对四川大学华西临床医学院150名接受过TBL教学的学生展开问卷调查,回收数据进行分析...目的探究团队为基础教学法(Team Based Learning,TBL)应用于医学类课程的实际效果及其影响因素。方法以本科阶段诊断学和系统整合临床课程的教学为例,对四川大学华西临床医学院150名接受过TBL教学的学生展开问卷调查,回收数据进行分析。结果总体来看,传统教学法有利于学生对知识的全面掌握,TBL教学法则有利于延长记忆时间;学生个人能力,TBL小组同组同学的表现及TBL题目难度均会影响TBL教学法的实施效果;TBL教学法在一门课程中的占比不宜高于50%。结论在医学类课程的教学中,TBL教学法与传统教学法各有优势,应当结合应用;针对TBL教学法目前暴露出的问题,需要学生、教师及教研组的三方努力进行完善改进。展开更多
文摘In the case of composite girders, an effective cooperation of both parts of the section is influenced by deformability of connectors. Limited flexural stiffness of welded studs, used commonly in bridge structures, does not provide full interaction of a steel beam and a concrete slab. This changes strain distribution in cross-sections of a composite girder and results in redistribution of internal forces in steel and concrete element. In the paper partial interaction index defined on the basis of a neutral axis position, which can be used for verification of steel-concrete interaction in real bridge structures rather than in specimens is proposed. The range of the index value changes, obtained during load testing of a typical steel-concrete composite beam bridge, is presented. The investigation was carried out on a motorway viaduct, consisting of two parallel structures. During the testing values of strains in girders under static and quasi-static loads were measured. The readings from the gauges were used to determine the index, characterizing composite action of the girders. Results of bridge testing under movable load, changing position along the bridge span is presented and obtained in-situ influence functions of strains and index values are commented in the paper.
文摘目的探究团队为基础教学法(Team Based Learning,TBL)应用于医学类课程的实际效果及其影响因素。方法以本科阶段诊断学和系统整合临床课程的教学为例,对四川大学华西临床医学院150名接受过TBL教学的学生展开问卷调查,回收数据进行分析。结果总体来看,传统教学法有利于学生对知识的全面掌握,TBL教学法则有利于延长记忆时间;学生个人能力,TBL小组同组同学的表现及TBL题目难度均会影响TBL教学法的实施效果;TBL教学法在一门课程中的占比不宜高于50%。结论在医学类课程的教学中,TBL教学法与传统教学法各有优势,应当结合应用;针对TBL教学法目前暴露出的问题,需要学生、教师及教研组的三方努力进行完善改进。
