麻豆画精品传媒2021一二三区丨狠狠干干干丨youjizz.com自拍丨97久久久丨情趣内衣a∨片在线观看丨在线播放无码高潮的视频丨无码专区人妻系列日韩丨中国国产野外1级毛片视频丨caoporn超碰97丨91在线免费视频观看丨啪啪免费网丨天天射视频丨www美色吧com丨久久网免费视频丨51嘿嘿嘿国产精品伦理丨亚洲国产精品无码中文lv丨吃奶呻吟张开双腿做受在线播放丨www国产国人免费观看视频丨午夜嘿嘿嘿影院丨99精品一区二区丨性欧美18-19sex性高清播放丨一级 黄 色 毛片丨变态拳头交视频一区二区丨国语自产拍在线观看对白丨看成年女人午夜毛片免费

When the steel structure is damaged, we need to find and solve the problem immediately. The main factors of steel structure damage are:

1) the structure's bearing capacity is insufficient due to load changes, overdue service, and changes in codes and regulations;

2) due to all kinds of accidental deformation, distortion, disability and sag of the component, the section of the component is weakened, the rod is warped and the connection is cracked;

3) deformation, cracking and warping of components or joints caused by temperature difference;

4) the section of steel structure members is weakened due to corrosion of chemical substances and electrochemical corrosion;

5) others include design, production, construction errors and illegal use and operation during the service period.

There are three main technical measures for steel structure reinforcement:

1) cross-section reinforcement method: steel is used to reinforce parts or the whole length of the component, and the whole part is made to bear common stress;

2) change the calculation diagram: add additional support, adjust the load distribution, reduce the level of internal force, force displacement on the statically indeterminate structure support, reduce the peak stress;

3) prestressed cable method: use high strength cable to strengthen the weak link of the structure or improve the overall bearing capacity, stiffness and stability of the structure.