钢管高性能混凝土恒高温后力学性能研究
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摘要
在确定高温后钢材和混凝土应力-应变关系的基础上,建立了恒高温后钢管高性能混凝土轴压构件的理论分析模型,对恒高温后该类构件的荷载-变形关系由线进行了计算,并与以往试验结果进行了比较,二者符合较好。分析结果表明,恒高温后钢管高性能混凝土轴压构件的荷载-变形关系弹性段变短,弹塑性段变长,极限承载力降低,极限承载力对应的应变增大,曲线下降段趋于不明显,这一特性与钢管普通混凝土构件高温后性能较为相似。
Based on the stress-strain relations for steel and concrete after high temperature, fiber-based model was developed to calculate the load versus axial deformation relationships for high-performance concrete filled circular hollow section (CHS) stub columm after exposure to high temperature. The numerical results show good agreement with the test results reported in the literature. It had been found that the load versus axial deformation relationships of high-performance concrete filled CHS stub columns subjected to high temperatures, showed strain hardening or an ehstic-peffecdy plastic behavior. The ultimate strength of a column was reduced and less than the corresponding value under ambient conditions and the strain at peak load was larger than the strain at room temperature. This behavior was similar to that of normal concrete-filled steel tube (CFST) generally.
Based on the stress-strain relations for steel and concrete after high temperature, fiber-based model was developed to calculate the load versus axial deformation relationships for high-performance concrete filled circular hollow section (CHS) stub columm after exposure to high temperature. The numerical results show good agreement with the test results reported in the literature. It had been found that the load versus axial deformation relationships of high-performance concrete filled CHS stub columns subjected to high temperatures, showed strain hardening or an ehstic-peffecdy plastic behavior. The ultimate strength of a column was reduced and less than the corresponding value under ambient conditions and the strain at peak load was larger than the strain at room temperature. This behavior was similar to that of normal concrete-filled steel tube (CFST) generally.
引文
[1]余志武，丁发兴，林松．钢管高性能混凝土短柱受力性能研究[J]．建筑结构学报，2002，23(2)：41-47．
[2]游经团，韩林海．钢管高性能混凝土压弯构件滞回性能试验研究[J]．地震工程与工程振动，2005，25(3)：98-103．
[3]韩林海，杨有福，李永进，冯斌．钢管高性能混凝土的水化热和收缩性能研究[J]．土木工程学报，2006，39(3)：1-9．
[4]曹文衔．损伤累积条件下钢框架结构火灾反应的分析研究[D]．同济大学博士学位论文．上海，1998．
[5]韩林海．钢管混凝土结构-理论与实践[M]．北京：科学出版社，2004．
[6]李卫，过镇海．高温下混凝土的强度和变形性能试验研究．建筑结构学报[J]．1993，14(1)：8-16．
[7] Mohamedbhai, G. T. G.. Effect of exposure tame and rates of heating and cooling on residual strength of heated concrete [J]. Magazine of Concrete Research, 1986, 38(136): 151-158.
[8]余志武，丁发兴，林松．高温后钢管高性能混凝土轴压短柱力学性能研究[J]．铁道学报，2003，25(4)：71-79．
[9] British Standard. BS5400 Steel, concrete and composite bridges, Part 5, Code of practice for the design of composite bridges [S]. British Standard Institution, 2005.
[10] Eurocode 4: Design of composite steel and concrete structures, part 1.1, general rules and rules for buildings [S]. Brussels (Belgium): European Committee for Standardization, 2004.
[11]中华人民共和国电力行业标准DL／T5085-1999．钢-混凝土组合结构设计规程[S]．中国电力出版社，1999．
[2]游经团，韩林海．钢管高性能混凝土压弯构件滞回性能试验研究[J]．地震工程与工程振动，2005，25(3)：98-103．
[3]韩林海，杨有福，李永进，冯斌．钢管高性能混凝土的水化热和收缩性能研究[J]．土木工程学报，2006，39(3)：1-9．
[4]曹文衔．损伤累积条件下钢框架结构火灾反应的分析研究[D]．同济大学博士学位论文．上海，1998．
[5]韩林海．钢管混凝土结构-理论与实践[M]．北京：科学出版社，2004．
[6]李卫，过镇海．高温下混凝土的强度和变形性能试验研究．建筑结构学报[J]．1993，14(1)：8-16．
[7] Mohamedbhai, G. T. G.. Effect of exposure tame and rates of heating and cooling on residual strength of heated concrete [J]. Magazine of Concrete Research, 1986, 38(136): 151-158.
[8]余志武，丁发兴，林松．高温后钢管高性能混凝土轴压短柱力学性能研究[J]．铁道学报，2003，25(4)：71-79．
[9] British Standard. BS5400 Steel, concrete and composite bridges, Part 5, Code of practice for the design of composite bridges [S]. British Standard Institution, 2005.
[10] Eurocode 4: Design of composite steel and concrete structures, part 1.1, general rules and rules for buildings [S]. Brussels (Belgium): European Committee for Standardization, 2004.
[11]中华人民共和国电力行业标准DL／T5085-1999．钢-混凝土组合结构设计规程[S]．中国电力出版社，1999．
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