铁路桥式中间车站无站台柱雨棚托架结构分析

Bracket Structure Analysis of No-standing Pillar Canopy in Railway Intermediate Bridge Type Station

研究目的:铁路中间站桥式车站无站台柱雨棚,主体结构形式通常采用拱形。采用Midas Gen软件对无站台柱雨棚托架在各项荷载工况作用下(恒载含自重、屋面活载、风荷载、温度作用以及水平地震作用)进行结构静力分析,提出无站台柱雨棚托架在各荷载工况下的受力和变形控制因素,以及工程设计时应注重的问题。研究结论:(1)铁路桥式中间站无站台柱雨棚,主体结构一般呈拱形,使托架结构承受两个方向的弯矩和剪力,由于剪力相对于杆轴偏心,因此也承受着扭矩,是典型的弯剪扭构件;(2)温度变化将引起托架结构一定程度的应力和应变,尤其是钢管桁架托架在温度作用下,托架结构的应力和轴向变形比较大;(3)预应力钢筋混凝土梁托架结构,在温度应力作用下易引起出现混凝土开裂现象,设计时应考虑托架结构合理分缝,以避免应力和变形累积;(4)本文对钢管桁架托架结构的分析方法与研究成果,对铁路中间站桥式车站的结构设计具有一定的参考价值。

Research purposes： The main structure form of railway intermediate bridge type station＇ s no -standing pillar canopy is usually be arched. Using Midas Gen software for structural static analysis of no - standing pillar canopy bracket, under various load conditions such as dead load with self - respect, roof live load, wind load, temperature and horizontal seismic action, we have come to the conclusion of the stress and deformation control factors of no - standing pillar canopy bracket under above conditions. Also proposed the points what should paid attention to in engineering designation. Research conclusions： （ 1 ） The main structure form of railway intermediate bridge type station＇ s no - standing pillar canopy usually be arched. It is made to bracket structure to bear bending moment and shear force in two directions. Due to the shear relative to the rod eccentric shaft, it withstands the torque and be regarded as typical bending shear and artifacts. （2） The temperature change will cause a certain degree of stress and strain of bracket structure, especially for steel pipe truss, which has larger stress and axial deformation. （3）The carrier structure of prestressed reinforced concrete girder is easy to cause concrete - cracking under the effect of temperature stress. Reasonable seam should be considered when designing the bracket structure, to avoid the stress and deformation accumulation. （4） The analysis and research of bracket steel truss structure in this paper, has a certain reference value in the structural design of the railway intermediate bridge stye station.