【作者】 陈英俊； 王立；

【Author】 CHEN YING-JUN WANG LJ (Northern Jiaotong University)

【机构】 北方交通大学；

【摘要】 本文从可靠度设计的角度,探讨我国铁路桥梁设计风荷载的一些问题。首先对极值Ⅰ型及Ⅱ型分布分别讨论了极值风速的分布函数,并举实例进行了计算。结果表明在非超过概率相同时,按极值Ⅱ型算得的风速大于按极值Ⅰ型算得者,其差随重现期的增加而愈显著。其次,根据我国现行铁路桥涵设计规范,在推导了作用及抗力的分项系数以后,讨论了与风荷载有关的荷载组合问题以及可靠度指标的校准问题。最后对今后需进一步研究的问题提出了建议。更多还原

【Abstract】 The distribution function of yearly maximum wind speed according to the theore- tical extreme distributions of types Ⅰ and Ⅱ are discussed with an example.The effect of the return period of maximum wind speed is also considered.In the next place,a number of partial factors are derived in order to evaluate the reliability level of the current Chinese specification for steel railway bridges in terms of the safety index.By reliability-based code calibration,an approprt.ate value of the wind lend factor in load combinations is also obtained.Finally,some problems for further discussion are proposed.更多还原