本研究通过现场数据调查、结构设计分析、施工质量问题评估及使用环境影响分析,系统研究了襄阳市某商务大楼连廊支撑牛腿开裂的成因。现场检测结果显示,牛腿开裂主要由施工质量问题引发,特别是钢筋定位不准确和混凝土保护层厚度过厚,同...本研究通过现场数据调查、结构设计分析、施工质量问题评估及使用环境影响分析,系统研究了襄阳市某商务大楼连廊支撑牛腿开裂的成因。现场检测结果显示,牛腿开裂主要由施工质量问题引发,特别是钢筋定位不准确和混凝土保护层厚度过厚,同时锚固位置有误进一步加剧了裂缝的扩展。在分析事故原因的基础上,综合对比了多种加固方案,最终选择了外包钢加固作为主要解决方案。加固完成后,通过静载试验、超声波检测和应变监测验证了方案的有效性,结果表明加固后的牛腿在承载力和结构稳定性方面显著提升。研究最终提出了针对类似工程的建议,强调了施工质量控制和合理加固方案选择的重要性,以保障建筑的安全与耐久性。This study systematically investigated the causes of corbel cracking in the corridor support of a commercial building in Xiangyang through on-site data collection, structural design analysis, construction quality evaluation, and assessment of environmental impact. The on-site inspection results showed that the cracking was primarily caused by construction quality issues, particularly inaccurate rebar positioning, and excessive concrete cover thickness, while incorrect anchoring further exacerbated the crack propagation. Based on the cause analysis, various reinforcement options were compared, and external steel reinforcement was ultimately selected as the main solution. After the reinforcement was completed, the effectiveness of the solution was verified through static load testing, ultrasonic testing, and strain monitoring. The results indicated significant improvements in the load-bearing capacity and structural stability of the corbels. Finally, the study provides recommendations for similar projects, emphasizing the importance of construction quality control and the selection of appropriate reinforcement solutions to ensure building safety and durability.展开更多
There are many cracked concrete structures, although there have been numerous efforts to eliminate cracks. Some cracks are very harmful and should be repaired as soon as possible. On the other hand, the other cracks a...There are many cracked concrete structures, although there have been numerous efforts to eliminate cracks. Some cracks are very harmful and should be repaired as soon as possible. On the other hand, the other cracks are almost harmless. So, a good guideline about how to deal with cracks in concrete structures had been needed. JCI （Japan Concrete Institute） published the first version of ＂Practical Guideline for Investigation and Repair of Cracked Concrete Structures＂ in 1980, the second version in 1987, the third version in 2003, and then the fourth version titled ＂Practical Guideline for Investigation, Repair and Strengthening of Cracked Concrete Structures-2009＂ was published. This Guideline is very practical, when cracks are observed in existed concrete structures, in any other countries as well as in Japan.展开更多
There are many cracked concrete structures worldwide. Although there have been numerous efforts to eliminate cracks, some cracks are very harmful and should be repaired as soon as possible. On the other hand, some cra...There are many cracked concrete structures worldwide. Although there have been numerous efforts to eliminate cracks, some cracks are very harmful and should be repaired as soon as possible. On the other hand, some cracks are almost harmless. So, a good guideline regarding how to deal with cracks in concrete structures is needed. In this guideline, the practical investigation, repair and strengthening method of cracked concrete structures is discussed. And the detecting subjects are cracks generated immediately after casting and during the service time. This guideline targets on the owners （including managers） of concrete structure and the engineers working for the maintenance of concrete structure. JCI （Japan Concrete Institute） published first version of ＂Practical Guideline for Investigation and Repair of Cracked Concrete Structures＂ in 1980, and then the fourth version titled ＂Practical Guideline for Investigation, Repair and Strengthening of Cracked Concrete Structures--2009＂ was published. This guideline is very practical when cracks are observed in existing concrete structures, in any other countries as well as in Japan. These three authors led the establishment of this guideline.展开更多
文摘本研究通过现场数据调查、结构设计分析、施工质量问题评估及使用环境影响分析,系统研究了襄阳市某商务大楼连廊支撑牛腿开裂的成因。现场检测结果显示,牛腿开裂主要由施工质量问题引发,特别是钢筋定位不准确和混凝土保护层厚度过厚,同时锚固位置有误进一步加剧了裂缝的扩展。在分析事故原因的基础上,综合对比了多种加固方案,最终选择了外包钢加固作为主要解决方案。加固完成后,通过静载试验、超声波检测和应变监测验证了方案的有效性,结果表明加固后的牛腿在承载力和结构稳定性方面显著提升。研究最终提出了针对类似工程的建议,强调了施工质量控制和合理加固方案选择的重要性,以保障建筑的安全与耐久性。This study systematically investigated the causes of corbel cracking in the corridor support of a commercial building in Xiangyang through on-site data collection, structural design analysis, construction quality evaluation, and assessment of environmental impact. The on-site inspection results showed that the cracking was primarily caused by construction quality issues, particularly inaccurate rebar positioning, and excessive concrete cover thickness, while incorrect anchoring further exacerbated the crack propagation. Based on the cause analysis, various reinforcement options were compared, and external steel reinforcement was ultimately selected as the main solution. After the reinforcement was completed, the effectiveness of the solution was verified through static load testing, ultrasonic testing, and strain monitoring. The results indicated significant improvements in the load-bearing capacity and structural stability of the corbels. Finally, the study provides recommendations for similar projects, emphasizing the importance of construction quality control and the selection of appropriate reinforcement solutions to ensure building safety and durability.
文摘There are many cracked concrete structures, although there have been numerous efforts to eliminate cracks. Some cracks are very harmful and should be repaired as soon as possible. On the other hand, the other cracks are almost harmless. So, a good guideline about how to deal with cracks in concrete structures had been needed. JCI （Japan Concrete Institute） published the first version of ＂Practical Guideline for Investigation and Repair of Cracked Concrete Structures＂ in 1980, the second version in 1987, the third version in 2003, and then the fourth version titled ＂Practical Guideline for Investigation, Repair and Strengthening of Cracked Concrete Structures-2009＂ was published. This Guideline is very practical, when cracks are observed in existed concrete structures, in any other countries as well as in Japan.
文摘There are many cracked concrete structures worldwide. Although there have been numerous efforts to eliminate cracks, some cracks are very harmful and should be repaired as soon as possible. On the other hand, some cracks are almost harmless. So, a good guideline regarding how to deal with cracks in concrete structures is needed. In this guideline, the practical investigation, repair and strengthening method of cracked concrete structures is discussed. And the detecting subjects are cracks generated immediately after casting and during the service time. This guideline targets on the owners （including managers） of concrete structure and the engineers working for the maintenance of concrete structure. JCI （Japan Concrete Institute） published first version of ＂Practical Guideline for Investigation and Repair of Cracked Concrete Structures＂ in 1980, and then the fourth version titled ＂Practical Guideline for Investigation, Repair and Strengthening of Cracked Concrete Structures--2009＂ was published. This guideline is very practical when cracks are observed in existing concrete structures, in any other countries as well as in Japan. These three authors led the establishment of this guideline.
