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Analysis of the mechanical properties of the part of the cable-stayed bridge construction control study

Author: GaoFei
Tutor: ChenHuai
School: Zhengzhou University
Course: Structural Engineering
Keywords: Prestressed Concrete Partially Cable Mobile frame construction method Mechanical analysis Construction Control
CLC: U441
Type: Master's thesis
Year: 2005
Downloads: 602
Quote: 10
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Abstract

With the rapid development of transportation, the country built many long-span bridges. The cable-stayed bridge in the structure of performance, economy and beautiful fine has many advantages, has now become one of the main bridge type of large-span bridges. Part of the cable-stayed bridge (also known as dwarf tower cable-stayed bridge) in recent years, the rise of a new bridge structure, it is characterized by tower dwarf, Liang Gang, cable centralized layout. Structural characteristics, the part of the cable-stayed bridge is between a bridge between the continuous beam bridge with cable-stayed bridge type. The cable-stayed bridge is many times statically indeterminate structure, a root cable-stayed internal force adjustments affect the internal forces of the main beam elevation and cable-stayed bridge construction process. Bridges linear and internal force distribution by large construction impacts have occurred in the past too much from the cable-stayed bridge due to construction reasons the bridge linear cis or even destruction, which meet the design requirements in order to ensure the cable-stayed bridge linear and internal forces, bridges construction monitoring is necessary. Development under construction in Pingdingshan City Road, the Cham River a bridge - prestressed concrete part of the cable-stayed bridge engineering examples, the mechanical properties of the bridge and bridge construction control study. Bridge to the double cross alone tower single cable plane cable-stayed bridge, the main bridge span of 88m and 72m tower, piers, beams consolidation system; main beam three prestressed variable cross-section single box of three-compartment box section ; solid rectangular cross-section along the bridge high above the main tower structure deck 22.7m, the width of 3.4m, Transverse to width 2.0m, arranged in the central median; stay cables for the fan-shaped distribution, along the bridge centrally arranged in around 1/3 span beam, beam cable distance of 4m, tower cable distance is 0.8m cable with double row cable symmetrically arranged on both sides of the main tower nine pairs of the cable through the saddle on both sides of the tower symmetric anchorage in a box girder diaphragms. Pingdingshan City Cham River Bridge construction site conditions, bridge construction with the the mobile frame construction method of the way. Based on the structural characteristics of the bridge, using the finite element method, discrete bridge, the main beam with variable cross-section beam element discrete, analog cable truss element is exposed only to pull, the main tower and thin-walled pier beam elements to simulate established cable-stayed bridge finite element model of the part, using the finite element program Midas / Civil static analysis of the bridge, dynamic analysis and stability analysis, bridge bridge status checking, and the bridge construction control method made detailed exploration Finally, combined with the Pingdingshan City Cham River bridge construction organization design, the use of finite element program Midas / Civil numerical simulation analysis of the construction process of the bridge, the research results apply specifically to the Cham River Bridge bridge construction control engineering practice. Based on the above work, we draw the following conclusions: 1. Primary beam moment, the part of the cable-stayed bridge is more evenly distributed, but the box girder that exist within the tension cables on the large prestressed reinforcement and deck, so that the main beam to bear than The large axial force. The calculation results show that the value of the stress of bridges and bridge towers are no more than the bridge design specification design value; Lasso calculated the tension values ??in bridge design specification of the allowed values, indicating that the bridge is structurally safe. 2 main beam stiffness is a major factor in the natural frequencies and vibration characteristics of the full-bridge. The bridge power calculation results show that the stage 1 of the part of the cable-stayed bridge with a main span of the vertical vibration modes, second order modes for vertical vibration of the side spans, the deck baseband is less than the fundamental frequency of plane the bridge main beam just while cable soft, in line with some of the structural characteristics of the cable-stayed bridge. 3 the part of the cable-stayed bridge in Bridge operational phase of the first-order stability factor of 3.94, to meet the general requirements of the cable-stayed bridge stability the first 4 instability characteristics of the bridge are the main face of the beam instability, indicating that the plane stiffness of the bridge is less than the surface just outside

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics
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