Vol. 4 No. 1 (2021)

Open Access

Article

Article ID: 311

Analysis of influence factors on line shape of high-speed railway beam-arch combination bridge

by Daihai Chen, Zhenqi Xu, Yuanmiao Qiu

Insight - Civil Engineering, Vol.4, No.1, 2021; 560 Views, 111 PDF Downloads

Taking the prestressed continuous beam-arch composite bridge on the Zheng Wan High-speed Railway as a research object, which across the South-to-North Water Transfer in Zhang Liang Town, the space finite element model of the bridge was established by Midas/Civil, the cantilever casting construction process of the main beam was simulated, and the influence of many different parameters on beam line shape of the bridge was investigate. The results show that the unbalanced weight of the hanging basket and the prestressed steel bar parameters have less influence on the beam line shape; the bulk density of concrete and the arrangement length of counterweight have a great influence on line shape, therefore, these should be considered as key control parameters during construction, the counterweight of boom beam can reduce the deformation of bridge’s mid-span, it is advantageous for the Analysis of Influence Factors on Line Shape of High-speed Railway Beam-arch Combination Bridge line shape control of the bridge.

Open Access

Article

Article ID: 312

Influence of surcharge load on the adjacent pile foundation in coastal floodplain

by Hao Zhang, Kai Sun

Insight - Civil Engineering, Vol.4, No.1, 2021; 871 Views, 103 PDF Downloads

In this paper, in order to investigate the behavior of existing piles caused by the horizontal and compression deformation of soft substratum due to backfill surcharge on coastal floodplain, three-dimensional finite element models of piles adjacent to surcharge load were established. The deformation and migration law of soft soil was analyzed. The behavior of single pile and double row pile adjacent to surcharge load were studied, in which the influence of surcharge load location, surcharge pressure, pile stiffness, and pile top constraint conditions were considered. The results show that as the position of surcharge load is closer and the surcharge pressure increases, the response (e.g. deformation and bending moment) is more obvious. With the increase of pile stiffness, the range of passive load is increased. The deformation behavior of pile body under different constraints of pile cap is significantly different. The effect of secondary bending moment caused by pile axial force is obvious and cannot be ignored. If there is a thick soft substratum, it is beneficial to improve the behavior of adjacent piles by using cement mixing pile reinforcement.

Open Access

Article

Article ID: 313

Study on secondary cable adjustment for cable-stayed bridges without back cables

by Zengshou Sun, Xiaocong Liu, Jianfeng Ma

Insight - Civil Engineering, Vol.4, No.1, 2021; 838 Views, 75 PDF Downloads

The structure of cable-stayed bridge without back cable is a new breakthrough. In this paper, the cable adjustment process of linzhou yingbin bridge is studied. the whole bridge model is established using the finite element software MIDAS CIVIL.This paper compares the measured cable force with the designed cable force and gets range of cable force difference, The influence matrix method is used for the second cable adjustment to ensure that the stress and structural deformation in the process of cable adjustment are within the range of the design requirements.The cable force variation of the whole bridge is detected by dynamic measuring instrument to ensure the construction safety in the process of cable adjustment.