城市桥梁栏杆设计的研究与探讨

Research and Discussion on Design of Urban Bridge Railing

在民用建筑规范中定义栏杆高度时,规定应将可踏部位考虑在内;而在公路桥涵和城市桥梁规范中,栏杆高度定义为人行道表面至栏杆扶手顶面的距离。对2种栏杆高度的定义进行分析后,建议城市桥梁规范后续修订时应从安全角度出发,设计时考虑合理的安全高度储备,引入“可踏部位”的概念以符合实际使用情况。另外归纳比较了几种规范中关于栏杆荷载的取值规定,发现城市桥梁规范中的栏杆水平荷载取值最高。

When defining the railing height in the civil building code,it is stipulated that the accessible parts should be taken into account.In the code of highway bridge culverts and urban bridges,the railing height is defined as the distance from the surface of the sidewalk to the top surface of the railing.After analyzing the difference between two railing heights,it is suggested that the subsequent revision of the bridge code should proceed from a safety perspective.The reasonable safe height reserve should be considered in the design.The concept of"accessible parts"is introduced to meet the actual conditions of use.In addition,the valuing requirements of railing load in several codes are summarized and compared.It is found that the value of horizontal load of railing in the urban bridge code is the highest.