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带轴向约束预应力轴心受拉钢构件抗火性能

ISSN号：1000-4750
期刊名称：工程力学
时间：2013
页码：166-173
分类：TU352.5[建筑科学—结构工程] TU394[建筑科学—结构工程]
作者机构：[1]武汉理工大学土木工程与建筑学院,武汉430070, [2]山东新汇建设集团有限公司,东营257091, [3]同济大学土木工程防灾国家重点实验室,上海200092
相关基金：国家自然科学基金项目（51278394,50738005）
相关项目：基于静力荷载变动的大跨度梁式结构的损伤识别

关键词：预应力, 轴心受拉钢构件, 抗火性能, 荷载比, 轴向刚度, pre-stress, axial tension steel members, fire resistance, load ratio, axial restrain

中文摘要：

为考察相邻构件的轴向约束作用对预应力轴心受力构件抗火性能的影响，建立了带轴向弹性约束的预应力轴心受拉钢构件的数值分析模型。边界条件是：对四面受火的轴心受拉钢构件下端支座约束3个方向自由度，上端支座约束构件横截面内自由度，而轴向采用弹性约束。考虑了荷载比、轴向约束刚度比2个关键参数，得到了系列轴力-时间关系曲线。数值分析结果表明：荷载比不变时，随着轴向约束刚度降低，构件的耐火时间提高；在约束刚度比不变条件下，荷载比对构件的临界时间影响较小。在轴向约束刚度比为0．02时，预应力轴心受拉杆件临界时间达到最大值；但在轴向约束为0时，预应力轴心受拉杆件耐火时间最短。

英文摘要：

The axial restrain of the adjoining member may influence the fire resistance of the heated pre-stressed steel tension member with elastically axial restrain. In order to investigate this influence, this paper proposes a numerical model for pre-stressed steel tension members with elastic end-constrain. The boundary conditions of finite element models are as followings： The bottom end of the model subjected to fire in all sides is constrained in three directions; the top end is fixed in the plane of cross-section and is constrained elastically along the axial direction. The key parameters taken into account are load levels and axial restraint degrees. A series of internal-force vs. time evolution curves of pre-stressed steel tension members at high temperature has been obtained. The numerical results demonstrate： 1） Axial constrain has a great influence on the fire resistance of pre-stressed steel tension members. The critical time of pre-stressed steel tension members increases with the axial restraint weakening. 2） Load ratio has little impact on the critical time of pre-stressed steel tension members when the axial constrain ratio keeps constant. 3） The critical time of pre-stressed steel tension members reaches maximum when the axial restraint ratio is 0.02. However, the critical time of the pre-stressed steel tension members reaches minimum when the axial restrain does not exist at all.

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