合理确定梁端塑性铰弯矩值及改进钢框架梁连接设计

多次强震震害表明,梁破坏时梁端截面并未能形成理想塑性铰,而是在梁柱连接处发生脆性破坏。提出了改进钢框架梁连接设计的具体作法,即局部加大梁端焊缝截面的同时,在梁端一定距离处又适当削弱梁翼缘尺寸,合理确定梁端塑性铰弯矩,按梁两端出现同向塑性铰求出钢框架梁柱连接、梁的拼接处的内力(M、V)作为多遇地震作用下的调整内力设计值,改进梁柱连接、梁拼接的设计,供工程设计和修订相应规范作参考。

Reasonable determination of hinge moment at beam end and improving the beam joint design of steel frame

Earthguake damage data of many strong earthquakes show that ideal hinges can not fully developed at the end of beams at failure phrase,however,brittle failure occurs at the joint for the steel frames.Based on proposal of the details to improve the joint design of the steel frame,to expanding locally the welded section of beam end and to reducing the flange section at a certain distance to beam ends are studied.Under the assumption of same directional hinges being concurrent at both ends of the beam,reasonable resistant moment of hinge and the capacity(M,V) of the joint are determined.The force is adopted as the adjusted design force under frequent earthquakes,and the joint design between beams and columns and slicing design of beams are improved,the results are applied to reference of design and improving code.