《建筑抗震设计规范》在多高层钢结构房屋抗侧力构件连接计算规定中隐存的安全问题

Safety problems of lateral force resistance joint calculation about multi-story and tall steel structures in Code for seismic design of buildings

新颁布的《建筑抗震设计规范》(GB 50011—2010)在多高层钢结构房屋抗侧力构件连接计算规定中隐存的安全问题有:1)在表5.4.2的新规定中,把2001版抗震规范强制性条文中焊缝的承载力抗震调整系数γRwE由0.90降成了与梁的γRbE相同的0.75,使原要求的强连接降成了二者之间并无强弱关系的"等强连接";2)在8.2.8-1条中虽有弹性阶段"钢结构抗侧力构件连接的承载力设计值,不应小于相连构件的承载力设计值;高强度螺栓连接不得滑移"的规定,但在不同连接抗力条件下如何计算?并没有给出计算公式,而把连接计算全都放在了8.2.8-3～5条用极限承载力验算的方法上。经对该法的深入分析和验证,其结果却又不能满足8.2.8-1条连接抗力的必要条件,使规范中的极限承载力验算方法在抗侧力构件连接计算式中并不起控制作用,从而失去了它的验算价值,使"强连接弱构件"的基本原则在计算中并没有得到实施。

There are safety problems of lateral force resistance joint calculation about multi-story and tall steel structures in Code for seismic design of buildings（GB 50011—2010）.In table 5.4.2,the seismic coefficient of welding seam γwRE reduced from 0.9（former code） to 0.75,which leads the joint strength no stronger but equal that may against the mandatory term.Although the stipulation in item 8.2.8-1 ＂design value of bearing capacity for lateral force resistance joint of steel structures,should not be lower than that of the connected component,and high strength bolt connection should not slip＂,we can only use the method in item 8.2.8-3～5 to check the calculation for making strong joint.But the result even cannot satisfy the essential condition of resistance connecting force,which makes the calculating method of the code about the ultimate bearing capacity for resisting lateral force member connections have no control function and lose its checking value.The basic principle of ＂the strength of connection should be stronger than that of component＂ in the calculating formula is not put into effect.